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| Ablation Behaviors of HfB2-HfC-SiC Ceramic Modified C/C Composites at Ultra-high Temperature |
| Received:January 28, 2016 Revised:June 15, 2016 |
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| DOI：10.7643/ issn.1672-9242.2016.03.002 |
| KeyWord:C/C composites matrix modification HfB2 HfC ablation performance |
| Author | Institution |
| WEI Xi |
State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing , China |
| LI Jie-wen |
State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing , China |
| ZHANG Wei-gang |
State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing , China |
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| Abstract: |
| Objective To fabricate HfB2-HfC-SiC ceramic modified C/C composites and investigate the ablation performance of the composites at ultra-high temperature. Methods Chemical vapor infiltration (CVI) combined with precursor impregnation & pyrolysis (PIP) method were used to fabricate HfC-SiC ceramic modified C/C composites(C/C-HfC-SiC) and HfB2-HfC-SiC ceramic modified C/C composites(C/C-HfB2-HfC-SiC). Atmospheric plasma torch was used to investigate the ablation performance of the composites. Results Linear ablation rates of C/C-HfC-SiC and C/C-HfB2-HfC-SiC composites at 2200 ℃ were 1.54×10-3 mm/s and 1.38×10-3 mm/s respectively. Conclusion The composites had unique microstructural features, with nano-sized HfB2 and HfC particles uniformly distributed in SiC phase. The liquid-phase SiO2 and the solid-phase HfO2 composite oxides film in situ formed on the surface of the composites could resist not only the erosion of high-speed gas flow, but also the inward diffusion of oxidative gases, which was the main cause for the excellent ablation resistance of the composites at ultra-high temperature. |
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