High-temperature tensile strength and fracture behavior of ZrB₂-SiC-graphite composite

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• 作者：Lingling Wang ; Dewen Kong ; Guodong Fang and Jun Liang
• 刊名：International Journal of Applied Ceramic Technology
• 出版年：2017
• 出版时间：January/February 2017
• 年：2017
• 卷：14
• 期：1
• 页码：31-38
• 全文大小：1968K
• ISSN：1744-7402

文摘

The tensile behavior of ZrB₂-SiC-graphite composite was investigated from room temperature to 1800°C. Results showed that tensile strength was 134.18 MPa at room temperature, decreasing to 50.34 MPa at 1800°C. A brittle-ductile transition temperature (1300°C) of ZrB₂-SiC-graphite composite was deduced from experimental results. Furthermore, the effect of temperature on the fracture behavior of ZrB₂-SiC-graphite composite was further discussed by microstructure observations, which showed that tensile strength was controlled by the relaxation of thermal residual stress below 1300°C, and was affected by the plastic flow during 1300°C and 1400°C. At higher temperature, the tensile strength was dominated by the changes of microstructures.