Self-reinforced Y-alpha-sialon ceramics with barium aluminosilicate as an additive

摘要

Y-alpha-sialons (Y0.333Si10Al2ON15) were prepared by hot pressing using 5 wt. BaAl2Si2O8 as an additive. The results showed that barium aluminosilicate not only served as a liquid-phase sintering aid to promote densification, but also facilitated the development of elongated alpha-sialon grains. The obtained self-toughened alpha-sialon was both hard and tough. The Vickers hardness, flexural strength, and fracture toughness are 18.9 GPa, 802 MPa, and 6.0 MPam(1/2), respectively. Post heat treatment could promote the growth of elongated alpha-sialon grains, hence further increasing its toughness. References: 27