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| Abstract No.: |
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Scheduled at:
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Thursday, June 08, 2017, Hall 12 12:00 PM
Aviation & Power Generation Industry II
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| Title: |
Composition, structure and oxidation mechanism of the MAX-phase thermally sprayed coatings
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| Authors: |
Ivan Mazilin* / Technological Systems for Protective Coatings, Ltd., Russian Federation
Nikolay Zaitsev / TSPC Ltd., Russia
Lev Baldaev/ TSPC Ltd., Russia
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| Abstract: |
MAX-phases are known to possess unique properties. Like conventional binary carbides they are elastically stiff, conduct both heat and current well, resistant to chemical attack and have rather low thermal expansion coefficient. However, like metals, they have high fracture toughness. That means high thermal shock resistance and impact tolerance.
Combination of such properties leads us to the proposition of using MAX-phase coatings to protect different types of composites from high-temperature erosion wear and oxidation. In this work we are to report the results of our development in the field of powder synthesis and coating production with Ti3SiC2 (TSC) and Ti2AlC (TAC) MAX-phase compositions. Powders were prepared by the self-propagating high temperature synthesis (SHS) technique. According to the XRD data, both powders contain not less than 75 mass% of the hexagonal MAX-phase (sp.gr. P63/mmc). To obtain coatings we used air plasma spray (APS) and detonation gun (DG) equipment. Both techniques led to successful coating formation with reasonable deposition efficiency. APS coatings showed higher porosity but less oxidation compared to DG ones. Finally, TSC and TAC coatings were subjected to the burner rig tests with surface temperature of 1400°C. Oxidation mechanism and rate was studied by the SEM cross-sections investigation.
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