Patent ID: 7354651
Filing Date: 2008-04-08
Classification: C04B,C23C,Y10T

Abstract:
1. An article comprising: a silicon-containing substrate; a silicide-containing bond coat layer overlying the substrate, wherein the bond coat layer comprises a metal silicide selected from the group consisting of a silicide of chromium, tantalum, titanium, tungsten, zirconium, hafnium, a rare earth, and a compatible combination thereof; an optional silica scale layer overlaying the bond coat layer; and an environmental barrier coating overlying the bond coat layer, wherein the environmental barrier coating comprises a reaction-generated corrosion resistant metal silicate layer wherein the metal silicate is at least one member of the group consisting of a yttrium silicate, a scandium silicate, a zirconium silicate, a hafnium silicate, a rare earth silicate, and combinations thereof, and wherein a silicon source for the reaction-generated metal silicate includes the silica scale layer, if present, or the silicide-containing bond coat layer in the absence of the silica scale layer.