Volume 35 Issue 2
Mar 2021
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HE Huijuan, YAN Xiaojie, SHU Xuefeng, XIAO Gesheng, HAO Xin, LI Zhigang. Mechanical Properties and Oxidation Behavior of ZrB2-SiC Ultra-High Temperature Ceramics Prepared by Spark Plasma Sintering[J]. Chinese Journal of High Pressure Physics, 2021, 35(2): 024104. doi: 10.11858/gywlxb.20200623
Citation: HE Huijuan, YAN Xiaojie, SHU Xuefeng, XIAO Gesheng, HAO Xin, LI Zhigang. Mechanical Properties and Oxidation Behavior of ZrB2-SiC Ultra-High Temperature Ceramics Prepared by Spark Plasma Sintering[J]. Chinese Journal of High Pressure Physics, 2021, 35(2): 024104. doi: 10.11858/gywlxb.20200623

Mechanical Properties and Oxidation Behavior of ZrB2-SiC Ultra-High Temperature Ceramics Prepared by Spark Plasma Sintering

doi: 10.11858/gywlxb.20200623
  • Received Date: 09 Oct 2020
  • Rev Recd Date: 06 Nov 2020
  • In the application environment, the surface of the ultra-high-speed aircraft is violently rubbed with the air to make the temperature extremely high. Compared with ordinary ceramics, ultra-high temperature ceramics possess a higher melting point with good oxidation and ablation resistance performance. Therefore, it is particularly interested to be used as thermal protection materials. In this paper, ZrB2-20%SiC ultra-high temperature ceramic materials are prepared by using the spark plasma two-step sintering process of ZrB2 nanopowder and SiC powder at 1700 ℃. The mechanical properties of ZrB2-20%SiC are studied through nanoindentation experiment and three-point bending experiment. The oxidation behavior of ZrB2-20%SiC ultra-high temperature ceramics at four different oxidation temperatures of 1000, 1200, 1400 and 1600 ℃ is analyzed in this paper. The results show that the hardness of the ZrB2-20%SiC ultra-high temperature is 18 GPa, and the elastic modulus is 541 GPa with the fracture toughness of 5.7 MPa·m1/2. When the oxidation temperature is 1600 ℃, the SiC inside the ultra-high temperature ceramic would transform from passive oxidation to active oxidation. As the oxidation temperature increases, the thickness of the ultra-high temperature ceramic oxide layer and the oxidation temperature demonstrate a positive correlation trend.

     

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