Densification, microstructure and mechanical properties of SiO2-cBN composites by spark plasma sintering

作者：Zhang Jianfeng; Tu Rong^*; Goto Takashi

来源：Ceramics International, 2012, 38(1): 351-356.

DOI：10.1016/j.ceramint.2011.07.013

• Mechanical properties
• Cubic boron nitride
• Silicon oxide
• Spark plasma sintering
• Phase transformation

SiO2-cBN composites were consolidated by spark plasma sintering at 1473-1973 K. The effects of cBN content and sintering temperature on the relative density, phase transformation, microstructure and mechanical properties of the SiO2-cBN composites were investigated. The relative density of the SiO2-cBN composites increased with increasing SiO2 content. The phase transformation of cBN to hBN in SiO2 cBN composites was identified at 1973 K, showing the highest transformation temperature in cBN-containing composites. The SiO2-20 vol% cBN composites sintered at 1673 K showed the highest hardness and fracture toughness of 12.5 GPa and 1.5 MPa m(1/2), respectively.

• 出版日期2012-1