Protective coatings which provide erosion resistance, and related articles and methods
AssigneeGeneral Electric Company
InventorsKrishnamurthy Anand, Tamara Jean Muth, Srinidhi Sampath, Prajina Bhattacharya, Biju Dasan
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Abstract
A coating composition is described, having a first coating layer which includes a metallic matrix in which metal carbide particles are dispersed; and a hard, dense second coating layer disposed over the first coating layer. The second coating layer is formed from a metal nitride-type material, and has an average roughness of less than about 80 micro-inches (Ra). Related articles and processes are also disclosed.
Claims34
A coating composition, comprising:
- (a) a first coating layer, comprising a metallic matrix in which metal carbide particles are dispersed;
- and
- (b) a hard, dense second coating layer disposed over the first coating layer, comprising a metal nitride material, and having an average roughness of less than about 80 micro-inches (Ra).
A method for the formation of a protective coating on a metallic substrate, comprising the following steps:
- (I) applying a first coating layer on the substrate by a technique selected from high velocity oxy-fuel (HVOF) or high-velocity air-fuel (HVAF), wherein the first coating material comprises a metallic matrix in which metal carbide particles are dispersed;
- and
- (II) applying a second coating layer over the first coating layer by a vapor deposition technique or by suspension plasma spraying, wherein the second coating layer comprises a metal nitride material.
Dependencies are inferred from the claim text.