ALUMINA COATED SILICON CARBIDE ABRASIVE PARTICULATE USEFUL AS A DISPERSOID IN METAL MATRICES

摘要

ALUMINA COATED SILICON CARBIDE PARTICULATE USEFUL AS AN ABRASIVE DISPERSOID IN METAL MATRICES Disclosed is an improved abrasive material particularly useful as a dispersoid in metal matrices to provide articles of use having superior abrasive properties, especially at elevated temperatures. The improved abrasive material typically comprises silicon carbide particulate, the individual particles of which have a predominantly alumina coating thereon to inhibit dissolution of the particles in the metal matrix at high temperatures. The invention finds special application in abrasive blade tips for service in gas turbine engines, the tips comprising a nickel base or cobalt base superalloy having the alumina coated silicon carbide particles dispersed therein. EH-5785b