Microstructure and mechanical properties of Y-SiAlON/BaSi2Al2O8 composite ceramics

作者：Lü Jianhua; Ye Feng; Liu Chunfeng; Liu Limeng; Huang Yudong; Zhou Yu

来源：Journal of the Chinese Ceramic Society, 2012, 40(9): 1253-1258.

• Celsian
• Composite ceramic
• Crack deflections
• Pull-out
• SiAlON

Y-SiAlON/BaSi2Al2O8 (BAS) composite ceramics were prepared via a hot-press sintering method using the powders of α-Si3N4, Al2O3, AlN, Y2O3 and BAS as raw materials. The effect of BAS content on phase composition, microstructure and mechanical properties was investigated. The results reveal that all the materials are fully densified (relative density >99%), and are composed of the elongated SiAlON grains. The amount of α-SiAlON decreased and the amount of β-SiAlON increased with increasing the BAS content, resulting in a drastic decrease in the hardness and slight decreases in the fracture toughness and elastic module. The Y-SiAlON/10% (in mass) BAS composite ceramics possessed a flexural strength of 775.5 MPa. The pull-out of elongated SiAlON grain and the crack deflection both are the main self-toughness mechanisms for Y-SiAlON/BAS composite ceramics.

• 出版日期2012