Densification, microstructure and mechanical properties of SiO2-cBN composites by spark plasma sintering |
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| Authors: | Jianfeng ZhangRong Tu Takashi Goto |
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| Affiliation: | Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan |
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| Abstract: | 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 m1/2, respectively. |
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| Keywords: | C Mechanical properties Cubic boron nitride Silicon oxide Spark plasma sintering Phase transformation |
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