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- W2003254443 abstract "Abstract The high strength and creep resistance of modern titanium alloys makes them potentially attractive for aero engine compressor blades operating at temperatures above 500° C, to improve thermal efficiency and performance. However, all these alloys suffer from oxidation at such elevated temperatures and the in-diffusing oxygen stabilizes the more brittle alpha-phase of the alloy making it prone to crack under stress. There is thus a need for protective highly adherent coatings. In the present work, chromium was deposited with simultaneous ion bombardment using 60 keV nitrogen ions, to a thickness of 1 μm. Ion assisted deposition provides excellent adhesion and a very compact, pore-free coating with a small grain size. However, at high temperatures titanium diffuses into the chromium and impairs its protectiveness. To combat this, a diffusion barrier of silicon nitride was deposited first, by evaporating silicon and matching the rate of arrival of Si atoms with a 0.5 keV nitrogen ion beam from a Kaufman source to produce Si3N4 to thicknesses from 0.1 to 0.3 μm. As an added protection, in some experiments an overlay coating of about 0.3 μm of silicon nitride was deposited after the chromium layer. Oxidation was carried out in air at temperatures between 600 and 800° C and for periods up to 100 h. Subsequent analysis by SIMS showed excellent protection up to at least 700° C but diffusion across the barrier occurred at 800° C. Titanium nitride was less successful than silicon nitride for barrier purposes." @default.
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- W2003254443 date "1991-07-01" @default.
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- W2003254443 title "Oxidation-resistant coatings on titanium alloys by ion beam assisted deposition" @default.
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- W2003254443 doi "https://doi.org/10.1016/0168-583x(91)95215-y" @default.
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