Patent ID: 9023423
Filing Date: 2015-05-05
Classification: B23K,C23C

Abstract:
1. A method of coating a metal substrate on a gas turbine engine in order to increase the oxidation resistance of said substrate at high temperature, comprising the steps of: forming a powdered mixture of a high-melt superalloy component or MCrAlY, where M comprises Fe, Ni and/or Co, a lower-melting component containing a melting point depressant, said melting point depressant comprising silicon, boron, hafnium or gold, and a binder material for said powdered mixture; applying said powdered mixture to a surface of said metal substrate at room temperature using an atomized spray to form a coating of substantially uniform thickness on said substrate surface; and heating said coated substrate surface under vacuum conditions to a temperature in the range of about 1900° F. to 2275° F., said temperature and vacuum conditions being sufficient to liquefy said lower-melting component and remove said binder material and form a liquid phase in which the higher melting powders become suspended in said liquid phase and develop a metallurgical bond to said substrate by liquid phase sintering.