| 摘要 |
An article 12 comprising a silicon-containing substrate 30, a silicide-containing bond coat layer 42 overlying the substrate, and an environmental barrier coating (EBC) 50 overlying the bond coat layer. The EBC comprises a corrosion resistant outer layer 66 comprising a corrosion resistant metal silicate. A process is also provided for forming the corrosion resistant outer layer over the silicide-containing bond coat layer. The bond coat may be a metallic silicide such as Cr, Mo, Nb, Ta, Ti, W, Zr or rare earth metal silicides. The corrosion resistant metal silicate may be yttrium silicate, scandium silicate, zirconium silicate, hafnium silicate or a rare earth metal silicate. |
