High‐temperature tensile strength and fracture behavior of ZrB2‐SiC‐graphite composite |
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| Authors: | Lingling Wang Dewen Kong Guodong Fang Jun Liang |
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| Affiliation: | 1. School of Civil Engineering, Guizhou University, Guiyang, People's Republic of China;2. Science and Technology on Advanced Composites in Special Environments Key Laboratory, Harbin Institute of Technology, Harbin, People's Republic of China |
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| Abstract: | 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. |
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| Keywords: | Microstructure fracture ceramic matrix composites strength |
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