Surface coatings and subcoats
OwnerSuri A. Sastriinventor
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Abstract
Coatings are disclosed (a) which are useful by themselves to substantially improve the surface properties of substrates to which they are applied and (b) which are useful as subcoats to substantially improve the bonding of coatings of nitrides, carbides and borides of titanium, hafnium and zirconium to such substrates. The coatings which are disclosed are novel materials characterized by a microcrystalline, single-phase, solid solution structure comprising: (a) about 20 to 70% by weight of at least one element from the group consisting of cobalt and nickel; (b) about 8 to 35% by weight of chromium; (c) about 3 to 20% by weight of at least one element from the group consisting of molybdenum and tungsten; and (d) about 0.5 to 10% by weight of at least one element from the group consisting of carbon, nitrogen and boron.
Claims30
A multilayer coating for a substrate, said coating comprising:
- (A) a subcoat layer which is bonded to said substrate, said subcoat being characterized by having a microcrystalline, single-phase, solid solution structure and having a composition comprising:
- (a) about 20 to 70% by weight of at least 1 element from the group consisting of cobalt and nickel;
- (b) about 8 to 35% by weight of chromium;
- (c) about 3 to 20% by weight of at least one element from the group consisting of molybdenum and tungsten;
- and
- (d) about 0.5 to 10% by weight of at least one element from the group consisting of carbon, nitrogen and boron;
- and
- (B) an outer coating layer bonded to said subcoat, said outer coating comprising at least 50% by weight of a material selected from the group consisting of nitrides, carbides and borides of titanium, hafnium and zirconium and combinations thereof.
A coating for a substrate, said coating being characterized by having a microcrystalline, single-phase, solid solution structure and a composition comprising:
- (a) about 20 to 70% by weight of at least one element from the group consisting of cobalt and nickel;
- (b) about 8 to 35% by weight of chromium;
- (c) about 3 to 20% by weight of at least 1 element from the group consisting of molybdenum and tungsten;
- and
- (d) about 0.5 to 10% by weight of at least 1 element from the group consisting of carbon, nitrogen and boron.
A coating as defined in 16 wherein about 0 to 80% by volume of a material selected from the group consisting of nitrides, carbides and borides of titanium, hafnium and zirconium and combinations thereof is dissolved therein.
Dependencies are inferred from the claim text.