Protection of gamma titanium aluminides with aluminosilicate coa

Details Protection of gamma titanium aluminides with aluminosilicate coa Protection of gamma titanium aluminides with aluminosilicate coa

1990-07-26

1992-06-02

Lindsay, Robert L.

Stock material or miscellaneous articles

Composite

Of quartz or glass

65 181, 65 591, 65 605, 65 608, 156 89, 156151, 4274197, 428698, B32B 700, C03C 2702

Patent

active

051185814

ABSTRACT:
A method and composition for protecting a gamma titanium aluminide alloy specimen subject to high temperature oxidation is disclosed. An alumino silicate glass coating is applied on the surface of the gamma titanium aluminide specimen. The coated specimen is heated to a temperature in a range of 2150.degree.-2250.degree. F. for a sufficient time period to form a silicide interfacial layer between the alloy and the glass coating. The glass coating is preferably a composition including SiO.sub.2 in a weight percentage of 60 to 65 Al.sub.2 O.sub.3 in a weight percent of 16 to 20. The glass coating results in minimal oxidation.

REFERENCES:
patent: 2467114 (1949-04-01), Deyrup
patent: 3088201 (1963-05-01), Louden et al.
patent: 3689943 (1972-10-01), Colantuono
patent: 4172922 (1979-10-01), Merz et al.
patent: 4369233 (1983-01-01), Schaik
patent: 4536435 (1985-08-01), Utsumi et al.
patent: 4921738 (1990-05-01), Cassidy

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