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Characterization of Ti2AlC coatings deposited with High Velocity Oxy-Fuel and Magnetron Sputtering Techniques
Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, The Institute of Technology.
2008 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

This Thesis presents two different deposition techniques for the synthesis of Ti2AlC coatings. First, I have fabricated Ti2AlC coatings by high velocity oxy-fuel (HVOF) spraying. Analysis with scanning electron microscopy (SEM) show dense coatings with thicknesses of ~150 µm when spraying with a MAXTHAL 211TM Ti2AlC powder of size ~38 µm in an H2/O2 gas flow. The films showed good adhesion to stainless steel substrates as determined by bending tests and the hardness was 3-5 GPa. X-ray diffraction (XRD) detected minority phases of Ti3AlC2, TiC, and AlxTiy alloys. The use of a larger powder size of 56 µm resulted in an increased amount of cracks and delaminations in the coatings. This was explained by less melted material, which is needed as a binding material. Second, magnetron sputtering of thin films was performed with a MAXTHAL 211TM Ti2AlC compound target. Depositions were made at substrate temperatures between ambient and 1000 °C. Elastic recoil detection analysis (ERDA) shows that the films exhibit a C composition between 42 and 52 at% which differs from the nominal composition of 25 at% for the Ti2AlC-target. The Al content, in turn, depends on the substrate temperature as Al is likely to start to evaporate around 700 °C. Co-sputtering with Ti target at a temperature of 700 °C, however, yielded Ti2AlC films with only minority contents of TiC. Thus, the addition of Ti is suggested to have two beneficial roles of balancing out excess of C and to retain Al by providing for more stoichiometric Ti2AlC synthesis conditions. Transmission electron microscopy and X-ray pole figures show that the Ti2AlC grains grow in two preferred orientations; epitaxial Ti2AlC (0001) // Al2O3 (0001) and with 37° tilted basal planes of Ti2AlC (101̅7) // Al2O3 (0001).

Place, publisher, year, edition, pages
Institutionen för fysik, kemi och biologi , 2008. , 30 p.
Series
Linköping Studies in Science and Technology. Thesis, ISSN 0280-7971 ; 1357
Keyword [en]
MAX phase, Thermal Spray, PVD
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:liu:diva-11422ISBN: 978-91-7393-936-2 (print)OAI: oai:DiVA.org:liu-11422DiVA: diva2:17838
Presentation
2008-04-24, Planc, Fysikhuset, Campus Valla, Linköpings universitet, Linköping, 10:15 (English)
Opponent
Supervisors
Note
Report code: LIU-TEK-LIC-2008:15.Available from: 2008-04-01 Created: 2008-04-01 Last updated: 2016-08-31
List of papers
1. Ti2AlC coatings deposited by High Velocity Oxy-Fuel spraying
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2008 (English)In: Surface and Coatings Technology, ISSN 0257-8972, Vol. 202, no 24, 5976-5981 p.Article in journal (Refereed) Published
Abstract [en]

High Velocity Oxy-Fuel has been utilized to spray coatings from Ti2AlC (MAXTHAL 211®) powders. X-ray diffraction showed that the coatings consist predominantly of Ti2AlC with inclusions of the phases Ti3AlC2, TiC, and Al–Ti alloys. The fraction of Ti2AlC in coatings sprayed with a powder size of 38 μm was found to increase with decreasing power of the spraying flame as controlled by the total gas flow of H2 and O2. A more coarse powder (56 μm) is less sensitive to the total gas flow and retains higher volume fraction of MAX-phase in the coatings, however, at the expense of increasing porosity. X-ray pole figure measurements showed a preferred crystal orientation in the coatings with the Ti2AlC (000l) planes aligned to the substrate surface. Bending tests show a good adhesion to stainless steel substrates and indentation yields a hardness of 3–5 GPa for the coatings sprayed with a powder size of 38 μm.

Place, publisher, year, edition, pages
Elsevier, 2008
Keyword
MAX-phase, High Velocity Oxy-Fuel (HVOF), Phase transitions, X-ray diffraction, Scanning electron microscopy (SEM)
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-13102 (URN)10.1016/j.surfcoat.2008.06.184 (DOI)
Available from: 2008-04-01 Created: 2008-04-01 Last updated: 2016-08-31
2. Direct current magnetron sputtering from a Ti2AlC target
Open this publication in new window or tab >>Direct current magnetron sputtering from a Ti2AlC target
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Manuscript (Other academic)
Identifiers
urn:nbn:se:liu:diva-13103 (URN)
Available from: 2008-04-01 Created: 2008-04-01 Last updated: 2010-01-13

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