Abstract: C/C-SiC-ZrC composites with different SiC-ZrC contents were prepared through the method of polymer infiltration and pyrolysis (PIP) to systematically test the effects of SiC-ZrC contents on microstructure, mechanical property and anti-ablative property of C/C-SiC-ZrC composites. Results showed that the content of ZrC significantly affected the mechanical property and anti-ablative property of the composites. Specifically, the composites have the best performance in terms of mechanical property when the ZrC content is 4.53%, and the bending, compressive and shear strengths are 358 MPa, 277 MPa, and 115 MPa receptively; the composites have good performance in terms of anti-ablative property when the ZrC content is 13.03%. The linear ablation rate and mass ablation rate of composites are 0.003 mm/s and 0.001 6 g/s after ablation by oxygena-cetylene flame at a heat flux of 3 200 kW/m2 for 300 s. It is found that a weak bond between the PyC layer and the ceramic layer forms as the ZrC content increases; the PyC layer and the ceramic layer will move first when a load is assumed, making it difficult for the toughening effect of the fiber to be produced, leading to a sharp performance decrease in the mechanical properties of the composite. When the ZrC content is 13.03%, the ZrO2 generated by oxidation that adhere firmly to the surface of the material, forms a binary eutectic mixture SiO2-ZrO2 with SiO2 of certain fluidity to compensate for the pores and gaps due to gas volatilization in the ablation process. The binary eutectic mixture SiO2-ZrO2 prevents the oxygen-containing components from further corroding the material and effectively improves the anti-ablative property and anti-oxidation resistance of the material.
张曦挚, 崔红, 胡杨, 邓红兵, 王昊. SiC-ZrC陶瓷含量对C/C-SiC-ZrC复合材料性能的影响[J]. 材料导报, 2022, 36(Z1): 21120073-5.
ZHANG Xizhi, CUI Hong, HU Yang, DENG Hongbing , WANG Hao. Ceramics Content of SiC-ZrC on the Properties of C/C-SiC-ZrC Composites. Materials Reports, 2022, 36(Z1): 21120073-5.
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2022, Vol. 36 
