Preparation and properties of 3D needle-punched C/ZrC-SiC composites by polymer infiltration and pyrolysis process

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• 作者：Chunlei Yan ; Rongjun Liu ; ^{rongjunliu@nudt.edu.cn" class="auth_mail} ; ^{y505559718@126.com" class="auth_mail} ; Yingbin Cao ; Changrui Zhang ; Deke Zhang
• 关键词：B. Microstructure ; C/ZrC&ndash ; SiC composite ; Polymer infiltration and pyrolysis ; Mechanical property ; Ablation behavior
• 刊名：Ceramics International
• 出版年：August 2014
• 年：2014
• 卷：40
• 期：7
• 页码：10961-10970
• 全文大小：4593 K

文摘

Three-dimensional (3D) needle-punched C/ZrC–SiC composites were successfully fabricated by infiltration and pyrolysis of a novel liquid ZrC precursor and polycarbosilane (PCS) separately. The effects of PIP cycles of PCS on the microstructures and mechanical property of the composites were studied. The C/ZrC–SiC composite with more PIP cycles of PCS had a high performance in mechanical property due to its higher density. The C/ZrC–SiC composite with 6 PIP cycles of PCS had a flexural strength of 142.4±17.5 MPa and a fracture toughness of 7.6±0.3 MPa m^1/2, which was superior to C/ZrC composites with the same total 20 PIP cycles. The ablation behaviors of the C/ZrC–SiC composite were studied using an oxyacetylene torch. The formation of continuous molten ZrO₂ layer contributed mainly the high ablation resistance in the center region, while the SiC matrix accounted for the improved oxidation resistance beyond the center and transition regions. Moreover, the ZrC matrix homogeneously distributed in composite can act as a reservoir of the ZrO₂ phase, and then supplemented the ZrO₂ loss continuously in the whole testing.