RARE EARTH PHOSPHATE BONDED CERAMIC

文件类型：PDF文档
文件大小：36K
PROBLEM TO BE SOLVED : To provide an oxide/oxide CMC (ceramic matrix composite) matrix which exhibits high temperature water vapor degradation resistance, while maintaining the thermal barrier properties of the FGI (friable graded insulation) and the mechanical properties of the underlying CMC, and which also prossesses relatively easily and inexpensively the constituents. SOLUTION : The oxide/oxide CMC matrix includes a rare earth phosphate binder incorporated in the matrix, an insulating layer on the matrix, or both. The rare earth phosphate is typically incorporated in the matrix in an amount of about 5 to 50 volume%, preferably about 10 to 30 volume%. The amount employed will depend, for example, on the desired amounts of matrix species to be cemented and the desired porosity (volume%) in the matrix. COPYRIGHT : (C)2010, JPO&INPIT