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Sputter deposition from a Ti2AlC target: Process characterization and conditions for growth of Ti2AlC
Linköpings universitet, Institutionen för fysik, kemi och biologi, Tunnfilmsfysik. Linköpings universitet, Tekniska högskolan.
Linköpings universitet, Institutionen för fysik, kemi och biologi, Tunnfilmsfysik. Linköpings universitet, Tekniska högskolan.ORCID-id: 0000-0003-1785-0864
Linköpings universitet, Institutionen för fysik, kemi och biologi, Tunnfilmsfysik. Linköpings universitet, Tekniska högskolan.
Linköpings universitet, Institutionen för fysik, kemi och biologi, Tunnfilmsfysik. Linköpings universitet, Tekniska högskolan.ORCID-id: 0000-0001-9140-6724
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2010 (Engelska)Ingår i: Thin Solid Films, ISSN 0040-6090, E-ISSN 1879-2731, Vol. 518, nr 6, s. 1621-1626Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Sputter deposition from a Ti2AlC target was found to yield Ti-Al-C films with a composition that deviates from the target composition of 2:1:1. For increasing substrate temperature from ambient to 1000 degrees C, the Al content decreased from 22 at.% to 5 at.%, due to re-evaporation. The C content in as-deposited films was equal to or higher than the Ti content. Mass spectrometry of the plasma revealed that the Ti and Al species were essentially thermalized, while a large fraction of C with energies andgt;4 eV was detected. Co-sputtering with Ti yielded a film stoichiometry of 2:0.8:0.9 for Ti:Al:C, which enabled growth of Ti2AlC. These results indicate that an additional Ti flux balances the excess C and therefore provides for more stoichiometric Ti2AlC synthesis conditions.

Ort, förlag, år, upplaga, sidor
Elsevier , 2010. Vol. 518, nr 6, s. 1621-1626
Nyckelord [en]
MAX phase, Titanium carbide, Compound target, Physical vapor deposition, X-ray diffraction
Nationell ämneskategori
Teknik och teknologier
Identifikatorer
URN: urn:nbn:se:liu:diva-54250DOI: 10.1016/j.tsf.2009.11.059ISI: 000274812200001OAI: oai:DiVA.org:liu-54250DiVA, id: diva2:302301
Anmärkning
Original Publication: Jenny Frodelius, Per Eklund, Manfred Beckers, Per Persson, Hans Högberg and Lars Hultman, Sputter deposition from a Ti2AlC target: Process characterization and conditions for growth of Ti2AlC, 2010, THIN SOLID FILMS, (518), 6, 1621-1626. http://dx.doi.org/10.1016/j.tsf.2009.11.059 Copyright: Elsevier Science B.V., Amsterdam. http://www.elsevier.com/ Tillgänglig från: 2010-03-05 Skapad: 2010-03-05 Senast uppdaterad: 2019-01-28
Ingår i avhandling
1. Thick and Thin Ti2AlC Coatings
Öppna denna publikation i ny flik eller fönster >>Thick and Thin Ti2AlC Coatings
2010 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

This Thesis explores the deposition techniques of magnetron sputtering and high velocity oxy-fuel (HVOF) spraying for Ti2AlC as a promising high-temperature material. Magnetron sputtering aims at producing thin (≤1 μm) Ti2AlC films of high crystal quality for use as a model system in understanding the material’s basic properties. HVOF is a new method for deposition of thick (≥200 μm) coatings by spraying Ti2AlC powder, with the aim of transferring the good bulk properties to coatings. The oxidation behavior of Ti2AlC coatings has been investigated for temperatures up to 1200 °C in air. As-deposited Ti2AlC(0001) thin films decompose into TiC during vacuum annealing at 700 °C by out-diffusion of Al as shown by x-ray diffraction analysis. The release of Al starts already at 500 °C in ambient air as driven by aluminum oxide formation on the film surface where the oxide initially forms clusters as observed by electron microscopy. While sputtering from a Ti2AlC target is simpler than by using different elemental targets, the resulting film composition differs from the target stoichiometry. This is due to differences in energy and angular distribution of the sputtered species and evaporation of Al at substrate temperatures above 700 °C. The composition can be compensated for by adding Ti to bind the Al and obtain phase-pure Ti2AlC coatings. For HVOF, I demonstrate how the total gas flow of a H2/O2 mixture (441-953 liter/min) and the powder grain size (30-56 μm) determine the thickness, density, and microstructure of the coatings. High gas flow and small grain size yield thick coatings of 210 μm with a low porosity of 2-8 % and a tensile stress of ≥80 MPa. A fraction of the Ti2AlC powder decomposes during spraying into TiC, Ti3AlC2, and Ti-Al alloys. The coatings also contain as much as 25 at.% O since the powder partly oxidizes during the spraying process. Increasing the powder size and decreasing the total gas flow yield a higher amount of Ti2AlC, but produces thinner coatings with lower cohesion. Post-annealing of the coatings at 900 °C in vacuum increases the Ti2AlC content due to a reversible phase transformation of the as-sprayed material. The high oxygen content, however, hinders the coating to completely transform into Ti2AlC and deteriorates its oxidation resistance. The work thus offers insights to the key parameters for optimizing Ti2AlC coating processing.

Ort, förlag, år, upplaga, sidor
Linköping: Linköping University Electronic Press, 2010. s. 63
Serie
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 1328
Nationell ämneskategori
Naturvetenskap
Identifikatorer
urn:nbn:se:liu:diva-57525 (URN)978-91-7393-356-8 (ISBN)
Disputation
2010-09-03, Planck, Fysikhuset, Campus Valla, Linköpings universitet, Linköping, 10:15
Opponent
Handledare
Tillgänglig från: 2010-06-22 Skapad: 2010-06-22 Senast uppdaterad: 2016-08-31Bibliografiskt granskad

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Frodelius, JennyEklund, PerBeckers, ManfredPersson, PerHögberg, HansHultman, Lars

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