liu.seSearch for publications in DiVA
Endre søk
Begrens søket
2345 201 - 213 of 213
RefereraExporteraLink til resultatlisten
Permanent link
Referera
Referensformat
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • oxford
  • Annet format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annet språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
Treff pr side
  • 5
  • 10
  • 20
  • 50
  • 100
  • 250
Sortering
  • Standard (Relevans)
  • Forfatter A-Ø
  • Forfatter Ø-A
  • Tittel A-Ø
  • Tittel Ø-A
  • Type publikasjon A-Ø
  • Type publikasjon Ø-A
  • Eldste først
  • Nyeste først
  • Skapad (Eldste først)
  • Skapad (Nyeste først)
  • Senast uppdaterad (Eldste først)
  • Senast uppdaterad (Nyeste først)
  • Disputationsdatum (tidligste først)
  • Disputationsdatum (siste først)
  • Standard (Relevans)
  • Forfatter A-Ø
  • Forfatter Ø-A
  • Tittel A-Ø
  • Tittel Ø-A
  • Type publikasjon A-Ø
  • Type publikasjon Ø-A
  • Eldste først
  • Nyeste først
  • Skapad (Eldste først)
  • Skapad (Nyeste først)
  • Senast uppdaterad (Eldste først)
  • Senast uppdaterad (Nyeste først)
  • Disputationsdatum (tidligste først)
  • Disputationsdatum (siste først)
Merk
Maxantalet träffar du kan exportera från sökgränssnittet är 250. Vid större uttag använd dig av utsökningar.
  • 201.
    Yang, Jing
    et al.
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Nanostrukturerade material. Linköpings universitet, Tekniska fakulteten. University of Politecn Cataluna, Spain.
    Odén, Magnus
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Nanostrukturerade material. Linköpings universitet, Tekniska fakulteten.
    Johansson-Joesaar, M. P.
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Nanostrukturerade material. Linköpings universitet, Tekniska fakulteten. SECO Tools AB, Sweden.
    Llanes, L.
    University of Politecn Cataluna, Spain.
    Grinding effects on surface integrity and mechanical strength of WC-Co cemented carbides2014Inngår i: 2ND CIRP CONFERENCE ON SURFACE INTEGRITY (CSI), ELSEVIER SCIENCE BV , 2014, Vol. 13, s. 257-263Konferansepaper (Fagfellevurdert)
    Abstract [en]

    In this study, the correlation existing among grinding, surface integrity, and flexural strength is investigated for WC-Co cemented carbides (hardmetals). A fine-grained WC-13 wt % Co grade and three different surface conditions: (1) ground, (2) mirror-like polished (reference), and (3) ground plus high-temperature annealed, are investigated. Surface integrity and mechanical characterization is complemented with fractography. The grinding strongly affects both surface integrity and flexural strength. During grinding, a damaged thin layer together with high compressive residual stresses is introduced. The layer results in considerable strength enhancement compared to the reference polished surface condition. Fractography reveals that the improved strength mainly stems from grinding-induced changes on effective location, from surface into subsurface levels, of the strength-controlling flaw.

  • 202.
    Yang, Jing
    et al.
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Nanostrukturerade material. Linköpings universitet, Tekniska fakulteten. University of Politecn Cataluna, Spain.
    Odén, Magnus
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Nanostrukturerade material. Linköpings universitet, Tekniska fakulteten.
    Johansson-Joesaar, Mats P.
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Nanostrukturerade material. Linköpings universitet, Tekniska fakulteten. SECO Tools AB, Sweden.
    Llanes, L.
    University of Politecn Cataluna, Spain; University of Politecn Cataluna, Spain.
    Influence of substrate microstructure and surface finish on cracking and delamination response of TiN-coated cemented carbides2016Inngår i: Wear, ISSN 0043-1648, E-ISSN 1873-2577, Vol. 352-353, s. 102-111Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The cracking and delamination of TiN-coated hardmetals (WC-Co cemented carbides) when subjected to Brale indentation were studied. Experimental variables were substrate microstructure related to low (6 wt% Co) and medium (13 wt% Co) binder content, and surface finishes associated with grinding and polishing stages before film deposition. Brale indentation tests were conducted on both coated and uncoated hardmetals. Emphasis has been placed on assessing substrate microstructure and subsurface finish effects on load levels at which cracking and delamination phenomena emerge, the type of cracking pattern developed, and how fracture mechanisms evolve with increasing load. It is found that polished and coated hardmetals are more brittle (radial cracking) and the adhesion strength (coating delamination) diminishes with decreasing binder content. Such a response is discussed on the basis of the influence of intrinsic hardness/brittleness of the hardmetal substrate on both cracking at the subsurface level and effective stress state, particularly regarding changes in shear stress component. Grinding promotes delamination compared to the polished condition, but strongly inhibits radial cracking. This is a result of the interaction between elastic-plastic deformation imposed during indentation and several grinding-induced effects: remnant compressive stress field, pronounced surface texture and micro cracking within a thin altered subsurface layer. As a consequence, coating spallation prevails over radial cracking as the main mechanism for energy dissipation in ground and coated hardmetals. (C) 2016 Elsevier B.V. All rights reserved.

  • 203.
    Yazdi, Gholamreza
    et al.
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Halvledarmaterial. Linköpings universitet, Tekniska högskolan.
    Vassilevski, K.
    Newcastle University.
    Cordoba Gallego, Jose Manuel
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Nanostrukturerade material. Linköpings universitet, Tekniska högskolan.
    Gogova, Daniela
    Linköpings universitet, Institutionen för fysik, kemi och biologi. Linköpings universitet, Tekniska högskolan.
    Nikitina, I. P.
    Newcastle University.
    Syväjärvi, Mikael
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Halvledarmaterial. Linköpings universitet, Tekniska högskolan.
    Odén, Magnus
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Nanostrukturerade material. Linköpings universitet, Tekniska högskolan.
    Wright, N.G.
    Newcastle University.
    Yakimova, Rositsa
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Halvledarmaterial. Linköpings universitet, Tekniska högskolan.
    Free standing AIN single crystal grown on pre-patterned and in situ patterned 4H-SiC substrates2010Inngår i: Materials Science Forum, Vols. 645-648, Transtec Publications; 1999 , 2010, Vol. 645-648, s. 1187-1190Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Free standing AIN wafers were grown on pre-patterned and in situ patterned 4H-SiC substrates by a physical vapor transport method. It is based on the coalescence of AIN microrods, which evolve from the apex of SiC pyramids grown on the SIC substrate during a temperature ramp up for in situ patterned substrate and SiC pyramids formed by reactive ion etching (RIE). This process yields stress-free (according XRD and Raman results) AIN single crystals with a thickness up to 400 mu m and low dislocation density.

  • 204.
    Yu, Cheng-Han
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Nanostrukturerade material.
    Temperature dependence of strain, microstructure and hardness in arc deposited TiAlNbN, TiAlVN and TiAlCrN coatings2016Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    This work investigates the mechanical properties and microstructure evolution of hard coatings at elevated temperature, which imitates the thermal condition of cutting tools operation. TiAlN has been widely studied due to the age hardening effect by spinodal decomposition at 800 ̊C, however, low phase stability of the c-AlN at high temperature above 1000 ̊C could lead to poor mechanical properties. By alloying with a ternary transition metal the thermal stability is expected to be improved. Three coatings, Ti0.37Al0.45Nb0.18N, Ti0.34Al0.47V0.19N and Ti0.32Al0.51Cr0.17N, and three reference coatings, Ti0.43Al0.57N, Ti0.49Al0.51N and Ti0.55Al0.45N, were deposited by cathodicarc evaporation. The thermal stability was then studied by annealing at temperatures ranging from 600 ̊C to 1100 ̊C.

    The composition of each coating was measured by energy dispersive x-ray spectroscopy (EDS) and the thickness, microstructure and surface morphology were studied by scanning electron microscopy (SEM). The microstructure was similar for all six coatings, but a higher macroparticle density was found in the Ti0.37Al0.45Nb0.18N coatings. The phase analysis from θ-2θ and grazing incidence X-ray diffraction indicates that Ti0.37Al0.45Nb0.18N has good phase stability due to the occurrence of h-AlN at 1100 ̊C, which is 100 ̊C higher than the reference TiAlN coatings. The in-plane stress was measured by sin2ψ method of X-ray diffraction, and the hardness was measured by nanoindentation. The stress state and hardness results do not have strong correlation, but (Ti,Al,Me)N coatings have better thermal stability than the reference TiAlN at 1000 ̊C and 1100 ̊C. TEM work has been done on Ti0.34Al0.47V0.19N with 800 ̊C and 1000 ̊C annealed samples. The mixture of c-AlN and h-AlN phases wasshown in 800 ̊C sample, and the h-AlN phase exists at the column boundaries for both samples. STEM z-contrast measurement on 1000 ̊C annealed sample showed the segregation of Ti-rich and Al-rich domains, where the V was primarily found in the Ti-rich domains. In summary, Ti0.37Al0.45Nb0.18N, Ti0.34Al0.47V0.19N and Ti0.32Al0.51Cr0.17N are promising candidates for high temperature application.

  • 205.
    Zhang, Shucan
    et al.
    Chinese Academic Science, Peoples R China.
    Wang, Zhenyu
    Chinese Academic Science, Peoples R China.
    Guo, Peng
    Chinese Academic Science, Peoples R China.
    Ke, Peiling
    Chinese Academic Science, Peoples R China.
    Odén, Magnus
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Nanostrukturerade material. Linköpings universitet, Tekniska fakulteten.
    Wang, Aiying
    Chinese Academic Science, Peoples R China.
    Temperature induced superhard CrB2 coatings with preferred (001) orientation deposited by DC magnetron sputtering technique2017Inngår i: Surface & Coatings Technology, ISSN 0257-8972, E-ISSN 1879-3347, Vol. 322, s. 134-140Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The influence of deposition temperature in the range of 100 degrees C to 400 degrees C on the microstructure and mechanical properties of CrB2 coatings by DC magnetron sputtering was studied. The coating texture changed from random mixed orientation with (101) and (001) planes to the preferred (001) orientation when increasing the deposition temperature. Moreover, the microstructure coating evolved from an underdense structure to a bulky columnar structure (similar to 50 nm), and finally to a dense nanoscale columnar structure (similar to 7 nm). This structural densification was mainly attributed to the enhanced atomic surface diffusion with increasing deposition temperature. It resulted in promotion of the (001) preferred orientation and greatly enhanced the mechanical properties. Specifically, when the deposition temperature was 300 degrees C, the CrB2 coatings exhibited the highest toughness while superhardness (51 +/- 2 GPa) was achieved for coating grown at 400 degrees C. (C) 2017 Published by Elsevier B.V.

  • 206.
    Zhang, Xuanjun
    et al.
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Molekylär ytfysik och nanovetenskap. Linköpings universitet, Tekniska fakulteten.
    Ali Ballem, Mohamed
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Nanostrukturerade material. Linköpings universitet, Tekniska högskolan.
    Ahrén, Maria
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Molekylär ytfysik och nanovetenskap. Linköpings universitet, Tekniska fakulteten.
    Suska, Anke
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Tillämpad Fysik. Linköpings universitet, Tekniska högskolan.
    Bergman, Peder
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Halvledarmaterial. Linköpings universitet, Tekniska högskolan.
    Uvdal, Kajsa
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Molekylär ytfysik och nanovetenskap. Linköpings universitet, Tekniska fakulteten.
    Nanoscale Ln(III)-carboxylate coordination polymers (Ln = Gd, Eu, Yb): temperature-controlled guest encapsulation and light harvesting2010Inngår i: Journal of the American Chemical Society, ISSN 0002-7863, E-ISSN 1520-5126, Vol. 132, nr 30, s. 10391-10397Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We report the self-assembly of stable nanoscale coordination polymers (NCPs), which exhibit temperature-controlled guest encapsulation and release, as well as an efficient light-harvesting property. NCPs are obtained by coordination-directed organization of pi-conjugated dicarboxylate (L1) and lanthanide metal ions Gd(III), Eu(III), and Yb(III) in a DMF system. Guest molecules trans-4-styryl-1-methylpyridiniumiodide (D1) and methylene blue (D2) can be encapsulated into NCPs, and the loading amounts can be controlled by changing reaction temperatures. Small angle X-ray diffraction (SAXRD) results reveal that the self-assembled discus-like NCPs exhibit long-range ordered structures, which remain unchanged after guest encapsulations. Experimental results reveal that the negatively charged local environment around the metal connector is the driving force for the encapsulation of cationic guests. The D1 molecules encapsulated in NCPs at 140 degrees C can be released gradually at room temperature in DMF. Guest-loaded NCPs exhibit efficient light harvesting with energy transfer from the framework to the guest D1 molecule, which is studied by photoluminescence and fluorescence lifetime decays. This coordination-directed encapsulation approach is general and should be extended to the fabrication of a wide range of multifunctional nanomaterials.

  • 207.
    Zhang, Xuanjun
    et al.
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Molekylär ytfysik och nanovetenskap. Linköpings universitet, Tekniska fakulteten.
    Ballem, Mohamed
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Nanostrukturerade material. Linköpings universitet, Tekniska högskolan.
    Hu, Zhang-Jun
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Molekylär ytfysik och nanovetenskap. Linköpings universitet, Tekniska fakulteten.
    Bergman, J Peder
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Halvledarmaterial. Linköpings universitet, Tekniska högskolan.
    Uvdal, Kajsa
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Molekylär ytfysik och nanovetenskap. Linköpings universitet, Tekniska fakulteten.
    Nanoscale Light-Harvesting Metal-Organic Frameworks2011Inngår i: Angewandte Chemie International Edition, ISSN 1433-7851, E-ISSN 1521-3773, Vol. 50, nr 25, s. 5728-5732Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    n/a

  • 208.
    Zhu, Jianqiang
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Nanostrukturerade material. Linköpings universitet, Tekniska högskolan.
    Microstructure evolution of Ti-based and Cr cathodes during arc discharging and its impact on coating growth2013Doktoravhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    This thesis explores the microstructure evolution of cathodes with various material compositions and grain sizes during cathodic arc evaporation processes as well as the impact on the arc movement, and the microstructure and properties of the deposited nitride coatings. The studied cathode material systems include conventionally metal forged Ti and Ti -Si cathodes, novel Ti3SiC2 MAX-phase cathodes, and dedicatedly designed powder-metallurgical Ti-Si and Cr cathodes with different grain size. The microstructure and chemical composition of the virgin and arced cathodes together with the microstructure and mechanical properties of the deposited coatings were analyzed with various characterization techniques, including x-ray diffractometry, x-ray photoelectron spectroscopy, elastic recoil detection analysis, scanning electron microscopy, focused ion beam sample preparation technique, transmission electron microscopy, energy dispersive x-ray, electron energy loss spectroscopy, and nanoindentation.

    In general, a converted layer forms on the cathode surfaces during cathodic arc evaporation. The thickness, the microstructure and the chemical composition of such layer are dependent on the composition and the grain size of the virgin cathodes, the nitrogen pressure, and the cathode fabrication methods.

    For Ti based materials, the converted layer is 5-12 μm thick and consists of nanosized nitrided grains caused by the high reactivity of Ti to the ambient nitrogen gas. In comparison, the Cr cathode is covered with a 10-15 μm converted layer with micrometer/sub-micrometer sized grains. Only very limited amounts of nitrogen are detected within the layer due to the low reactivity of Cr to nitrogen.

    For Ti-Si cathodes, the existence of multiple phases of Ti and Ti5Si3 with different work function renders preferential arc erosion on the Ti5Si3 phase during discharging. The preferential erosion generates higher roughness of the Ti-Si cathode surface compared with Ti. By increasing the grain size of the virgin Ti-Si cathodes from ~8 μm to ~620 μm, the average roughness  increases from 1.94±0.13 μm to 91±14 μm due to the amplified impact of preferential erosion of the enlarged Ti5Si3 grains. The variation of the preferential erosion affects the arc movement, the deposition rate, and the macroparticle distribution of the deposited Ti-Si-N coatings.

    A novel Ti3SiC2 MAX phase is used as cathode material for the growth of Ti-Si-C-N coating. During arcing, the cathode surface forms a converted layer with two sublayers, consisting of a several-micrometer region with a molten and resolidified microstructure followed by a region with a decomposed microstructure. The microstructure and hardness of the deposited Ti -Si-C-N coatings is highly dependent on the wide range of coating compositions attained. In the coatings with abundance of N, the combined presence of Si and C strongly disturbs cubic phase growth and compromises their mechanical strength. At a nitrogen pressure of 0.25-0.5 Pa, 45-50 GPa superhard (Ti,Si)(C,N) coatings with a nanocrystalline feathered structure were obtained.

    By increasing the grain size of the elemental Cr cathodes from ~10 μm and ~300 μm, the grain structure of the converted layer on the cathode surface varies from equiaxed grains to laminated grains after evaporating in a nitrogen atmosphere. When evaporated with a stationary fixture, the worn Cr cathode surface contains an organized pattern of deep ditches in the surface. The formation of such patterns is enhanced by increasing the cathode grain size. The fixture movement, which is either stationary or single rotating, affects the phase composition, the droplet density and the microstructure of the deposited Cr-N coatings, which consequently determines the mechanical properties of the coatings.

    Delarbeid
    1. Characterization of worn Ti-Si cathodes used for reactive cathodic arc evaporation
    Åpne denne publikasjonen i ny fane eller vindu >>Characterization of worn Ti-Si cathodes used for reactive cathodic arc evaporation
    Vise andre…
    2010 (engelsk)Inngår i: JOURNAL OF VACUUM SCIENCE and TECHNOLOGY A, ISSN 0734-2101, Vol. 28, nr 2, s. 347-353Artikkel i tidsskrift (Fagfellevurdert) Published
    Abstract [en]

    The microstructural evolution of Ti1-xSix cathode surfaces (x=0, 0.1, 0.2) used in reactive cathodic arc evaporation has been investigated by analytical electron microscopy and x-ray diffractometry. The results show that the reactive arc operated in N-2 atmosphere induces a 2-12 mu m thick N-containing converted layer consisting of nanosized grains in the two-phase Ti and Ti5Si3 cathode surface. The formation mechanism of this layer is proposed to be surface nitriding and redeposition of macroparticles formed during the deposition process. The surface roughness of the worn Ti1-xSix cathodes increases with increasing Si content, up to 20 at. %, due to preferential erosion of Ti5Si3.

    HSV kategori
    Identifikatorer
    urn:nbn:se:liu:diva-54604 (URN)10.1116/1.3330767 (DOI)000275515000029 ()
    Merknad
    Original Publication: Jianqiang Zhu, Anders Eriksson, Naureen Ghafoor, M P Johansson, J Sjolen, Lars Hultman, Johanna Rosén and Magnus Odén, Characterization of worn Ti-Si cathodes used for reactive cathodic arc evaporation, 2010, JOURNAL OF VACUUM SCIENCE and TECHNOLOGY A, (28), 2, 347-353. http://dx.doi.org/10.1116/1.3330767 Copyright: American Vacuum Society http://www.avs.org/ Tilgjengelig fra: 2010-03-26 Laget: 2010-03-26 Sist oppdatert: 2016-08-31
    2. Influence of Ti-Si cathode grain size on the cathodic arc process and resulting Ti-Si-N coatings
    Åpne denne publikasjonen i ny fane eller vindu >>Influence of Ti-Si cathode grain size on the cathodic arc process and resulting Ti-Si-N coatings
    Vise andre…
    2013 (engelsk)Inngår i: Surface & Coatings Technology, ISSN 0257-8972, E-ISSN 1879-3347, Vol. 235, nr 25, s. 637-647Artikkel i tidsskrift (Fagfellevurdert) Published
    Abstract [en]

    The influence of the Ti-Si cathode grain size on cathodic arc processes and resulting Ti-Si-N coating synthesis has been studied. 63 mm Ti-Si cathodes containing 20-25 at % Si with four dedicated grain size of ~8 µm, ~20 µm, ~110 µm, and ~600 µm were fabricated via spark plasma sintering or hot isostatic pressing. They were evaporated in 2 Pa nitrogen atmosphere in an industrial-scale arc deposition system and the Ti-Si-N coatings were grown at 50 A, 70 A, and 90 A arc current. The composition and microstructure of the virgin and worn cathode surfaces as well as the resulting coatings were characterized using optical and electron microscopy, x-ray diffraction, elastic recoil detection analysis, x-ray photoelectron spectroscopy, and nanoindentation. The results show that the existence of multiple phases with different work function values directly influences the cathode spot ignition behavior and also the arc movement and appearance. Specifically, there is a preferential erosion of the Ti5Si3-phase grains. By increasing the grain size of the virgin cathode, the preferential erosion is enhanced, such that the cathode surface morphology roughens substantially after 600 Ah arc discharging. The deposition rate of the Ti-Si-N coating is increased with decreasing grain size of the evaporated Ti-Si cathodes. The composition, droplet density, and droplet shape of the coatings are influenced by the arc movement, which is also shown to depend on the cathode grain size.

    sted, utgiver, år, opplag, sider
    Elsevier, 2013
    Emneord
    cathodic arc evaporation; powder metallurgy; work function; cathode surface evolution; deposition rate
    HSV kategori
    Identifikatorer
    urn:nbn:se:liu:diva-96402 (URN)10.1016/j.surfcoat.2013.08.042 (DOI)000329596100081 ()
    Tilgjengelig fra: 2013-08-19 Laget: 2013-08-19 Sist oppdatert: 2018-01-03bibliografisk kontrollert
    3. Microstructure evolution of Ti3SiC2 compound cathodes during reactive cathodic arc evaporation
    Åpne denne publikasjonen i ny fane eller vindu >>Microstructure evolution of Ti3SiC2 compound cathodes during reactive cathodic arc evaporation
    Vise andre…
    2011 (engelsk)Inngår i: Journal of Vacuum Science & Technology. A. Vacuum, Surfaces, and Films, ISSN 0734-2101, E-ISSN 1520-8559, Vol. 29, nr 3, s. 031601-Artikkel i tidsskrift (Fagfellevurdert) Published
    Abstract [en]

    The microstructure evolution and compositional variation of Ti3SiC2 cathode surfaces during reactive cathodic arc evaporation are presented for different process conditions. The results show that phase decomposition takes place in the near-surface region, resulting in a 5-50 mu m thick converted layer that is affected by the presence of nitrogen in the deposition chamber. This layer consists of two different sublayers, i.e., 1-20 mu m thick top layer with a melted and resolidified microstructure, followed by a 4-30 mu m thick transition layer with a decomposed microstructure. The converted layer contains a polycrystalline TiCx phase and trace quantities of Si-rich domains with Ti5Si3(C) at their interface. The arc discharge causes Si redistribution in the two regions of the layer, whose Si/(Ti+Si) ratio is higher in the top region and lower in the transition region compared to the virgin material.

    sted, utgiver, år, opplag, sider
    American Vacuum Society, 2011
    HSV kategori
    Identifikatorer
    urn:nbn:se:liu:diva-68016 (URN)10.1116/1.3569052 (DOI)000289689000021 ()
    Tilgjengelig fra: 2011-05-06 Laget: 2011-05-06 Sist oppdatert: 2017-12-11
    4. Ti-Si-C-N Thin Films Grown by Reactive Arc Evaporation from Ti3SiC2 Cathodes
    Åpne denne publikasjonen i ny fane eller vindu >>Ti-Si-C-N Thin Films Grown by Reactive Arc Evaporation from Ti3SiC2 Cathodes
    Vise andre…
    2011 (engelsk)Inngår i: Journal of Materials Research, ISSN 0884-2914, E-ISSN 2044-5326, Vol. 26, s. 874-881Artikkel i tidsskrift (Fagfellevurdert) Published
    Abstract [en]

    Ti-Si-C-N thin films were deposited onto WC-Co substrates by industrial scale arc evaporation from Ti3SiC2 compound cathodes in N2 gas. Microstructure and hardness were found to be highly dependent on the wide range of film compositions attained, comprising up to 12 at.% Si and 16 at.% C. Nonreactive deposition yielded films consisting of understoichiometric TiCx, Ti and silicide phases with high (27 GPa) hardness. At a nitrogen pressure of 0.25-0.5 Pa, below that required for N saturation, superhard, 45-50 GPa, (Ti,Si)(C,N) films with a nanocrystalline feathered structure were formed. Films grown above 2 Pa displayed crystalline phases of more pronounced nitride character, but with C and Si segregated to grain boundaries to form weak grain boundary phases. In abundance of N, the combined presence of Si and C disturb cubic phase growth severely and compromises the mechanical strength of the films.

    sted, utgiver, år, opplag, sider
    Cambrdige University Press, 2011
    HSV kategori
    Identifikatorer
    urn:nbn:se:liu:diva-61992 (URN)10.1557/jmr.2011.10 (DOI)
    Merknad

    Original Publication: Anders Eriksson, Jianqiang Zhu, Naureen Ghafoor, Jens Jensen, Grzegorz Greczynski, Mats Johansson, Jacob Sjölen, Magnus Odén, Lars Hultman and Johanna Rosén, Ti-Si-C-N Thin Films Grown by Reactive Arc Evaporation from Ti3SiC2 Cathodes, 2011, Journal of Materials Research, (26), 874-881. http://dx.doi.org/10.1557/jmr.2011.10 Copyright: Mrs Materials Research Society http://www.mrs.org/

    Tilgjengelig fra: 2010-11-18 Laget: 2010-11-18 Sist oppdatert: 2018-01-03
    5. Effects of cathode grain size and substrate fixturing on the microstructure evolution of arc evaporated Cr-cathodes and Cr-N coating synthesis
    Åpne denne publikasjonen i ny fane eller vindu >>Effects of cathode grain size and substrate fixturing on the microstructure evolution of arc evaporated Cr-cathodes and Cr-N coating synthesis
    Vise andre…
    2014 (engelsk)Inngår i: Journal of Vacuum Science & Technology. A. Vacuum, Surfaces, and Films, ISSN 0734-2101, E-ISSN 1520-8559, Vol. 32, nr 2, s. 021515-Artikkel i tidsskrift (Fagfellevurdert) Published
    Abstract [en]

    The influence of the cathode grain size and the substrate fixturing on the microstructure evolution of the Cr cathodes and the resulting Cr-N coating synthesis is studied. Hot isostatic pressed Cr cathodes with three different grain sizes were arc evaporated in a nitrogen atmosphere and Cr-N coatings were deposited on cemented carbide substrate at 2 and 4 Pa nitrogen pressure, respectively. The Cr cathodes before and after arc discharging are composed of polycrystalline α-Cr regardless of the grain size. A converted layer forms on the Cr cathode surface and its microstructure differs with the cathode grain size. A stationary substrate fixturing results in ditches covering the cathode surface while a single rotating fixturing does not. The increased grain size of the virgin Cr cathodes enhances the quantities of the ditches. The possible causes are addressed. At 2 Pa nitrogen pressure, the Cr-N coatings deposited with the single rotating fixturing comprise only cubic CrN phase while the ones deposited with the stationary fixturing contain a mixture of hexagonal Cr2N and cubic CrN phases. By the increasing grain size of the Cr cathode, the droplet density of the Cr-N coatings increase somewhat while the hardness decreases for the Cr-N coatings deposited with stationary fixturing at 2 Pa nitrogen pressure.

    Emneord
    Cathodic arc deposition, cathode surface evolution, substrate fixturing, wormlike ditches, grain size
    HSV kategori
    Identifikatorer
    urn:nbn:se:liu:diva-96789 (URN)10.1116/1.4865923 (DOI)000335964200056 ()
    Tilgjengelig fra: 2013-08-27 Laget: 2013-08-27 Sist oppdatert: 2019-11-21bibliografisk kontrollert
  • 209.
    Zhu, Jianqiang
    et al.
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Nanostrukturerade material. Linköpings universitet, Tekniska högskolan.
    Eriksson, Anders
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Tunnfilmsfysik. Linköpings universitet, Tekniska högskolan.
    Ghafoor, Naureen
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Tunnfilmsfysik. Linköpings universitet, Tekniska högskolan.
    Johansson, M P
    SECO Tools AB.
    Sjolen, J
    SECO Tools AB.
    Hultman, Lars
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Tunnfilmsfysik. Linköpings universitet, Tekniska högskolan.
    Rosén, Johanna
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Tunnfilmsfysik. Linköpings universitet, Tekniska högskolan.
    Odén, Magnus
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Nanostrukturerade material. Linköpings universitet, Tekniska högskolan.
    Characterization of worn Ti-Si cathodes used for reactive cathodic arc evaporation2010Inngår i: JOURNAL OF VACUUM SCIENCE and TECHNOLOGY A, ISSN 0734-2101, Vol. 28, nr 2, s. 347-353Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The microstructural evolution of Ti1-xSix cathode surfaces (x=0, 0.1, 0.2) used in reactive cathodic arc evaporation has been investigated by analytical electron microscopy and x-ray diffractometry. The results show that the reactive arc operated in N-2 atmosphere induces a 2-12 mu m thick N-containing converted layer consisting of nanosized grains in the two-phase Ti and Ti5Si3 cathode surface. The formation mechanism of this layer is proposed to be surface nitriding and redeposition of macroparticles formed during the deposition process. The surface roughness of the worn Ti1-xSix cathodes increases with increasing Si content, up to 20 at. %, due to preferential erosion of Ti5Si3.

  • 210.
    Zhu, Jianqiang
    et al.
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Nanostrukturerade material. Linköpings universitet, Tekniska högskolan.
    Eriksson, Anders O.
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Tunnfilmsfysik. Linköpings universitet, Tekniska högskolan.
    Ghafoor, Naureen
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Nanostrukturerade material. Linköpings universitet, Tekniska högskolan.
    Greczynski, Grzegorz
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Tunnfilmsfysik. Linköpings universitet, Tekniska högskolan.
    Hultman, Lars
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Tunnfilmsfysik. Linköpings universitet, Tekniska högskolan.
    Rosén, Johanna
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Tunnfilmsfysik. Linköpings universitet, Tekniska högskolan.
    Odén, Magnus
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Nanostrukturerade material. Linköpings universitet, Tekniska högskolan.
    Microstructure evolution of Ti3SiC2 compound cathodes during reactive cathodic arc evaporation2011Inngår i: Journal of Vacuum Science & Technology. A. Vacuum, Surfaces, and Films, ISSN 0734-2101, E-ISSN 1520-8559, Vol. 29, nr 3, s. 031601-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The microstructure evolution and compositional variation of Ti3SiC2 cathode surfaces during reactive cathodic arc evaporation are presented for different process conditions. The results show that phase decomposition takes place in the near-surface region, resulting in a 5-50 mu m thick converted layer that is affected by the presence of nitrogen in the deposition chamber. This layer consists of two different sublayers, i.e., 1-20 mu m thick top layer with a melted and resolidified microstructure, followed by a 4-30 mu m thick transition layer with a decomposed microstructure. The converted layer contains a polycrystalline TiCx phase and trace quantities of Si-rich domains with Ti5Si3(C) at their interface. The arc discharge causes Si redistribution in the two regions of the layer, whose Si/(Ti+Si) ratio is higher in the top region and lower in the transition region compared to the virgin material.

  • 211.
    Zhu, Jianqiang
    et al.
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Nanostrukturerade material. Linköpings universitet, Tekniska högskolan.
    Johansson Jöesaar, Mats P.
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Nanostrukturerade material. Linköpings universitet, Tekniska högskolan. Seco Tools, Fagersta, Sweden.
    Polcik, Peter
    PLANSEE Composite Materials GmbH.
    Jensen, Jens
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Tunnfilmsfysik. Linköpings universitet, Tekniska högskolan.
    Greczynski, Grzegorz
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Tunnfilmsfysik. Linköpings universitet, Tekniska högskolan.
    Hultman, Lars
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Tunnfilmsfysik. Linköpings universitet, Tekniska högskolan.
    Odén, Magnus
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Nanostrukturerade material. Linköpings universitet, Tekniska högskolan.
    Influence of Ti-Si cathode grain size on the cathodic arc process and resulting Ti-Si-N coatings2013Inngår i: Surface & Coatings Technology, ISSN 0257-8972, E-ISSN 1879-3347, Vol. 235, nr 25, s. 637-647Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The influence of the Ti-Si cathode grain size on cathodic arc processes and resulting Ti-Si-N coating synthesis has been studied. 63 mm Ti-Si cathodes containing 20-25 at % Si with four dedicated grain size of ~8 µm, ~20 µm, ~110 µm, and ~600 µm were fabricated via spark plasma sintering or hot isostatic pressing. They were evaporated in 2 Pa nitrogen atmosphere in an industrial-scale arc deposition system and the Ti-Si-N coatings were grown at 50 A, 70 A, and 90 A arc current. The composition and microstructure of the virgin and worn cathode surfaces as well as the resulting coatings were characterized using optical and electron microscopy, x-ray diffraction, elastic recoil detection analysis, x-ray photoelectron spectroscopy, and nanoindentation. The results show that the existence of multiple phases with different work function values directly influences the cathode spot ignition behavior and also the arc movement and appearance. Specifically, there is a preferential erosion of the Ti5Si3-phase grains. By increasing the grain size of the virgin cathode, the preferential erosion is enhanced, such that the cathode surface morphology roughens substantially after 600 Ah arc discharging. The deposition rate of the Ti-Si-N coating is increased with decreasing grain size of the evaporated Ti-Si cathodes. The composition, droplet density, and droplet shape of the coatings are influenced by the arc movement, which is also shown to depend on the cathode grain size.

  • 212.
    Zhu, Jianqiang
    et al.
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Nanostrukturerade material. Linköpings universitet, Tekniska högskolan.
    Syed, Muhammad Bilal
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Nanostrukturerade material. Linköpings universitet, Tekniska högskolan.
    Polcik, Peter
    PLANSEE Composite Materials GmbH, Germany.
    Håkansson, G.
    Ionbond Sweden AB, Linköping, Swedeb.
    Johansson Jöesaar, Mats P.
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Nanostrukturerade material. Linköpings universitet, Tekniska högskolan. Seco Tools, Fagersta, Sweden.
    Ahlgren, M.
    Sandvik Coromant, Stockholm, Sweden.
    Odén, Magnus
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Nanostrukturerade material. Linköpings universitet, Tekniska högskolan.
    Effects of cathode grain size and substrate fixturing on the microstructure evolution of arc evaporated Cr-cathodes and Cr-N coating synthesis2014Inngår i: Journal of Vacuum Science & Technology. A. Vacuum, Surfaces, and Films, ISSN 0734-2101, E-ISSN 1520-8559, Vol. 32, nr 2, s. 021515-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The influence of the cathode grain size and the substrate fixturing on the microstructure evolution of the Cr cathodes and the resulting Cr-N coating synthesis is studied. Hot isostatic pressed Cr cathodes with three different grain sizes were arc evaporated in a nitrogen atmosphere and Cr-N coatings were deposited on cemented carbide substrate at 2 and 4 Pa nitrogen pressure, respectively. The Cr cathodes before and after arc discharging are composed of polycrystalline α-Cr regardless of the grain size. A converted layer forms on the Cr cathode surface and its microstructure differs with the cathode grain size. A stationary substrate fixturing results in ditches covering the cathode surface while a single rotating fixturing does not. The increased grain size of the virgin Cr cathodes enhances the quantities of the ditches. The possible causes are addressed. At 2 Pa nitrogen pressure, the Cr-N coatings deposited with the single rotating fixturing comprise only cubic CrN phase while the ones deposited with the stationary fixturing contain a mixture of hexagonal Cr2N and cubic CrN phases. By the increasing grain size of the Cr cathode, the droplet density of the Cr-N coatings increase somewhat while the hardness decreases for the Cr-N coatings deposited with stationary fixturing at 2 Pa nitrogen pressure.

  • 213.
    Zuo, Xiao
    et al.
    Chinese Academic Science, Peoples R China; Chinese Academic Science, Peoples R China.
    Ke, Peiling
    Chinese Academic Science, Peoples R China; Chinese Academic Science, Peoples R China.
    Chen, Rende
    Chinese Academic Science, Peoples R China.
    Li, Xiaowei
    Chinese Academic Science, Peoples R China.
    Odén, Magnus
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Nanostrukturerade material. Linköpings universitet, Tekniska fakulteten.
    Wang, Aiying
    Chinese Academic Science, Peoples R China; Chinese Academic Science, Peoples R China.
    Discharge state transition and cathode fall thickness evolution during chromium HiPIMS discharge2017Inngår i: Physics of Plasmas, ISSN 1070-664X, E-ISSN 1089-7674, Vol. 24, nr 8, artikkel-id 083507Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The temporal evolutions of target voltage and current waveforms under different pulse voltage and working pressure conditions were studied during Cr high power impulse magnetron sputtering discharges. Target voltage and current characteristics demonstrated that when the pulse width was set as 200 mu s, HiPIMS discharge went through a four-stage sequence during each pulse, Townsend discharge, glow discharge, afterglow, and pulse-off stages. A discharge state transition in the glow discharge stage happened at high pulse voltage and working pressure conditions. Furthermore, the dependence of reduced cathode fall thickness pdcon pulse voltage, working pressure, and normalized current density j/p(2) was presented. It was found that gas rarefaction leads to a change of relationship between pd(c) and j/p(2). A noticeable increase of the cathode fall thickness caused by gas rarefaction has been found. Published by AIP Publishing.

2345 201 - 213 of 213
RefereraExporteraLink til resultatlisten
Permanent link
Referera
Referensformat
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • oxford
  • Annet format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annet språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf