Silicon nitride compositions in the Si{hd 3{b N{HD 4{B -Y{HD 2{B O{HD 3{B -SiO{HD 2 {B system

摘要

Dense, ceramic compositions fabricated within the Si3N4-Si2N2O-Y2Si2O7 compatibility triangle in the Si3N4-SiO2-Y2O3 system are extremely stable in oxidizing environments and particularly suited for use as a high temperature structural material. In addition, the hot-pressed, densified articles fabricated from compositions within the compatibility triangle exhibit improved strength and creep resistance at elevated temperatures relative to commercial Si3N4.