Patent ID: 8343589
Filing Date: 2013-01-01
Classification: C04B,C23C

Abstract:
1. A method of making a component having calcium magnesium aluminosilicate (CMAS) mitigation capability comprising: providing a component comprising a ceramic matrix composite or a monolithic ceramic; applying an environmental barrier coating to the component, the environmental barrier coating comprising: a bond coat layer comprising silicon overlying the component; an optional silica layer overlying the bond coat layer; at least one transition layer overlying the bond coat layer or the optional silica layer comprising a composition selected from the group consisting of mullite, barium strontium aluminosilicate (BSAS), rare earth disilicates, and combinations thereof; an optional outer layer comprising an outer layer material selected from the group consisting of BSAS, rare earth monosilicates, rare earth disilicates, and combinations thereof; and a separate CMAS mitigation layer overlying the at least one transition layer or the optional outer layer, the separate CMAS mitigation layer including beryl as a CMAS mitigation composition thereof.