Hard, ductile coating system
AssigneeHoneywell International Inc.
InventorThomas E. Strangman
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Abstract
The invention provides hard, ductile coatings comprising a ductile bonding layer of zirconium or titanium alloyed with a precious metal and a hard, surface layer comprising at least one compound selected from the group consisting of zirconium nitride, titanium nitride, zirconium carbide and titanium carbide and a precious metal segregated into the grain boundaries. The present invention also provides hard ductile multilayer coatings comprised of alternating ductile metal and hard nitride or carbide layers. The invention also includes methods to manufacture nitride or carbide coatings with ductile precious metal grain boundaries. The coatings provide an erosion resistant coating to surfaces to which they are applied.
Claims16
A coating comprising:
- a bonding layer comprising at least one metal selected from the group consisting of zirconium and titanium, and further comprising up to about 4 wt % of a first distributed metal selected from the group consisting of a precious metal, a non-nitride forming metal, and a non-carbide forming metal;
- an erosion resistance layer formed on the bonding layer, the erosion resistance layer comprising at least one compound selected from the group consisting of zirconium nitride, titanium nitride, zirconium carbide and titanium carbide, and further comprising up to about 4 wt % of a second distributed metal that is distributed into grain boundaries of the erosion resistance layer, the second distributed metal selected from the group consisting of a precious metal, a non-nitride forming metal, and a non-carbide forming metal.
An article, comprising:
- a substrate;
- a bonding layer on the substrate, the bonding layer comprising at least one metal selected from the group consisting of zirconium and titanium, and further comprising up to about 4 wt % of a first distributed metal selected from the group consisting of a precious metal a non-nitride forming metal, and a non-carbide forming metal;
- an erosion resistance layer on said substrate, said erosion resistance layer comprising at least one compound selected from the group consisting of zirconium nitride, titanium nitride, zirconium carbide and titanium carbide, and further comprising up to about 4 wt % of a second distributed metal selected from the group consisting of a precious metal, a non-nitride forming metal, and a non-carbide forming metal, wherein said second distributed metal is distributed into grain boundaries of the erosion resistance layer.
Dependencies are inferred from the claim text.