Glass-ceramic coatings for titanium aluminide surfaces

Details Glass-ceramic coatings for titanium aluminide surfaces Glass-ceramic coatings for titanium aluminide surfaces

C - Chemistry, Metallurgy

23

D

117/162

C23D 5/00 (2006.01) C03C 8/02 (2006.01) C03C 10/00 (2006.01) C23C 24/10 (2006.01) C23D 7/00 (2006.01)

Patent

CA 2023657

Abstract of the Disclosure An article of manufacture comprising protectively coated titanium aluminide, and a method for making it, wherein the protective coating is an adherent crystalline alkaline earth silicate glass-ceramic coating having a composition consisting essentially, in weight percent on the oxide basis, of about 20-75% total of oxides selected in amounts not exceeding the indicated proportions from the group consisting of up to about 50% BaO, 55% SrO, and 35% CaO, 25-60% of SiO2 and, as optional constituents, 0-25% MnO, 0-20% MgO, and 0-30% total of other compatible bivalent and trivalent metal oxides. The coating is applied as a continuous glassy coating and is converted to a crystalline glass-ceramic coating by heat treatment.

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