Patent ID: 7544394

Claim:
A method for producing a thermal barrier coating/environmental barrier coating system on a silicon containing material substrate comprising: applying an environmental barrier coating (EBC) over said silicon containing material substrate; and applying a thermal barrier coating (TBC) over the EBC, said thermal barrier coating comprising a compound consisting essentially of a rhombohedral phase; wherein said compound has the formula of: A 4 B 3 O 12 , wherein A comprises at least one rare earth element; and B is selected from the group consisting of Zr, Hf and mixtures thereof, said TBC comprises a primary constituent portion and a stabilizer portion, said stabilizer portion of said TBC comprises an oxide of said at least one of rare earth element A, said primary constituent portion of said TBC consists of an oxide of B, to produce a stabilized hafnia, a stabilized zirconia or a mixture thereof on the EBC and wherein said primary constituent portion consists of hafnia or a mixture of zirconia and hafnia, or zirconia.