Oxide-forming protective coatings for niobium-based materials

Details Oxide-forming protective coatings for niobium-based materials Oxide-forming protective coatings for niobium-based materials

C - Chemistry, Metallurgy

23

C

C23C 30/00 (2006.01) C22C 27/02 (2006.01) C23F 15/00 (2006.01)

Patent

CA 2682455

A coating (20) suitable for use as protective oxide-forming coatings (20) on Nb-based substrates (18), and particularly monolithic niobium-based alloys, exposed to high temperatures and oxidative environments. The coating (20) contains aluminum, may further contain silicon, and optionally contains niobium, titanium, hafnium, and/or chromium, which in combination form one or more intermetallic phases that promote the formation of a slow-growing oxide scale (26). The intermetallic phases may be M(Al,Si)3, M5(Al,Si)3, and/or M3Si5Al2 where M is niobium, titanium, hafnium, and/or chromium.

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