Imparting high-temperature degradation resistance to metallic components

Abstract

A method of imparting high-temperature, degradation resistance to a component involving applying a metal slurry comprising a Co-based metallic composition comprising Co, Cr, W, Si, C, and B, a binder, and a solvent to a surface of the component, and sintering the Co-based metallic composition to form a substantially continuous Co-based alloy coating on the surface of the body.

What is claimed is: 
     
         1 . A method of imparting high-temperature, degradation resistance to a metallic component comprising:
 applying a metal slurry comprising solvent, binder, and metal particles of a Co-based alloy comprising between about 0.05 and about 0.5 wt % B, between about 25 and about 33 wt % Cr, between about 0.5 and about 3 wt % Si, W in an amount up to about 15 wt %, and balance Co to a surface of the metallic component, and wherein the metallic component has a body of a material selected from the group consisting of carbon steel, stainless steel, and alloy steel; and   heating to remove the solvent and binder and to sinter the Co-based alloy to form a substantially continuous Co-based alloy coating on the surface of the metallic component.   
     
     
         2 . The method of  claim 1  wherein the alloy consists essentially of between about 0.05 and about 0.5 wt % B, between about 25 and about 33 wt % Cr, between about 0.5 and about 3 wt % Si, W in an amount up to about 15 wt %, and balance Co. 
     
     
         3 . The method of  claim 1  wherein the coating has a thickness between about 100 and about 1000 microns. 
     
     
         4 . The method of  claim 1  wherein the coating has a thickness between about 100 and about 300 microns. 
     
     
         5 . The method of  claim 1  wherein the coating has a thickness between about 250 and about 300 microns. 
     
     
         6 . The method of  claim 2  wherein the coating has a thickness between about 100 and about 1000 microns. 
     
     
         7 . The method of  claim 2  wherein the coating has a thickness between about 100 and about 300 microns. 
     
     
         8 . The method of  claim 2  wherein the coating has a thickness between about 250 and about 300 microns. 
     
     
         9 . The method of  claim 1  wherein the Co-based alloy comprises between about 0.05 and about 0.5 wt % B, about 1.2 wt % C, about 28 wt % Cr, about 1.1 wt % Si, about 4.5 wt % W, and balance Co. 
     
     
         10 . The method of  claim 1  wherein the Co-based alloy comprises between about 0.05 and about 0.5 wt % B, between about 1.4 and about 1.85 wt % C, about 29.5 wt % Cr, about 1.5 wt % Si, about 8.5 wt % W, and balance Co. 
     
     
         11 . The method of  claim 1  wherein the Co-based alloy comprises between about 0.05 and about 0.5 wt % B, about 2.45 wt % C, about 31 wt % Cr, about 1 wt % Si, about 13 wt % W, and balance Co. 
     
     
         12 . The method of  claim 1  wherein the metal slurry consists essentially of the Co-based powdered alloy particles, the binder, and the solvent, and wherein the Co-based powdered alloy particles are an alloy consisting essentially between about 0.05 and about 0.5 wt % B, about 1.2 wt % C, about 28 wt % Cr, about 1.1 wt % Si, about 4.5 wt % W, and balance Co. 
     
     
         13 . The method of  claim 1  wherein the metal slurry consists essentially of the Co-based powdered alloy particles, the binder, and the solvent, and wherein the Co-based powdered alloy particles are an alloy consisting essentially between about 0.05 and about 0.5 wt % B, between about 1.4 and about 1.85 wt % C, about 29.5 wt % Cr, about 1.5 wt % Si, about 8.5 wt % W, and balance Co. 
     
     
         14 . The method of  claim 1  wherein the metal slurry consists essentially of the Co-based powdered alloy particles, the binder, and the solvent, and wherein the Co-based powdered alloy particles are an alloy consisting essentially between about 0.05 and about 0.5 wt % B, about 2.45 wt % C, about 31 wt % Cr, about 1 wt % Si, about 13 wt % W, and balance Co. 
     
     
         15 . The method of  claim 9  wherein the coating has a thickness between about 100 and about 1000 microns. 
     
     
         16 . The method of  claim 9  wherein the coating has a thickness between about 100 and about 300 microns. 
     
     
         17 . The method of  claim 10  wherein the coating has a thickness between about 100 and about 1000 microns. 
     
     
         18 . The method of  claim 10  wherein the coating has a thickness between about 100 and about 300 microns. 
     
     
         19 . The method of  claim 11  wherein the coating has a thickness between about 100 and about 1000 microns. 
     
     
         20 . The method of  claim 11  wherein the coating has a thickness between about 100 and about 300 microns.