Thermal shock resistance of b' -Sialon-BN composites prepared by pressureless sintering and reaction bonding
Hayama Seiji; Ozawa Masakuni; Suzuki Suguru; Chua Geoge Sy; Yamamoto Kunji
Abstract:The thermal shock resistance of Beta' -Sialon-BN composites prepared by two different sintering processes, pressureless sintering (PLS) and reaction bonding (RB), were investigated with respect to the effect of hexagonal-BN content. The addition of BN showed increasing porosity for PLS body end crack extension for RB body. The water quenching thermal shock test showed that PLS body had better thermal shock resistance, especially for BN 20 mass %, than RB body. The results could be explained using Hasselman's theory, indicating that PLS bodies have shorter crack length with higher crack density. Key Words:beta prime sialon, boron nitride, composite, pressureless sintering, reaction bonding, thermal shock resistance