Patent ID: 6436470
Filing Date: 2002-08-20
Classification: C23C,Y02T

Abstract:
The method of applying a particular material to a metallic substrate, comprising the steps of:removing impurities from a surface of said substrate; forming a coating composition having a braze material and at least one particulate material, said braze material being a nickel braze alloy having a melting temperature of about 930-970Â° C. and being less than the melting temperature of said particulate material; applying said coating composition to said substrate surface; and creating a diffusion bond between said substrate and coating composition by sequentially heating said coating composition and substrate to a first temperature above the melting temperature of said braze material but less than the melting temperature of said particulate material, holding said coating composition and substrate at said first temperature for a first period of time, cooling said coating composition and substrate from said first temperature to a second temperature of about 700 degrees C., which is below the melting temperature of said braze material, holding said coating composition and substrate at said second temperature for a second period of time, and then cooling said coating composition and substrate to room temperature, such that substantially no defects are created between said coating composition and substrate when said heated composition and substrate are cooled due to the presence of excess braze liquid degenerated during such heating; whereby said particulate material and said braze material comprise a layer on said substrate surface.