Strength Properties and Microstructure of Diphase β—Sialon／Al2O3 Composites

摘要

Study on modules of rupture and microstructure of xphase bearing diphase β－Sialon and diphase β－Sialon/Al2O3 composites shows that MOR increases with tempera-ture rise up to a maximum oint and then decreases,For diphase β－Sialon materials,the maximum strength reaches 130 MPa-170 MPa at 1200℃；whereas for diphase β－Sialon/Al2O3 composites,the maximum strength reaches 200MPa-300 MPa at 1000℃，In the microstructure of th composite ,oblong crystals of x-phase and hexagonal prismatic crystals of β－Sialon are interlaced in the skeleton structure of corundum.This struture creates a distinctly intensifying effect on the strength of the composite.