Patent ID: 6733908
Filing Date: 2004-05-11
Classification: C04B,C23C,F01D,Y02T,Y10T

Abstract:
A multilayer article comprising:a substrate comprising a compound selected from the group consisting of a ceramic compound, a Si-containing metal alloy and combinations thereof; an outer layer comprising stabilized zirconia; and intermediate layers located between said outer layer and said substrate comprising a mullite-containing layer comprising 1) mullite or 2) mullite and an alkaline earth metal aluminosilicate, and a chemical barrier layer located between said mullite-containing layer and said outer layer, wherein said chemical barrier layer comprises a compound selected from the group consisting of mullite, hafnia, hafnium silicate, rare earth silicate, and combinations thereof, with the proviso that said multilayer article does not have a layer consisting essentially of barium strontium aluminosilicate between said mullite-containing layer and said chemical barrier layer, and wherein said chemical barrier layer is contiguous with said mullite-containing layer.