General Electric Company
Environmental barrier coating and methods of preparation

Abstract:

Methods of forming an environmental barrier coating are disclosed. A method includes disposing a powder-based coating on a substrate, heat-treating the powder-based coating at a temperature greater than 800.degree. C. and less than 1200.degree. C. to form a porous coating that includes surface-connected pores, infiltrating at least some of the surface-connected pores of the porous coating with an infiltrant material to form an infiltrated coating, and sintering the infiltrated coating at a temperature greater than 1200.degree. C. and less than 1500.degree. C. to form the environmental barrier coating on the substrate.