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| Ablation Performance of Anti-oxidation Coatings on Surface of Lightweight Cf/SiOC Composite |
| Received:May 30, 2019 Revised:June 24, 2019 |
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| DOI：10.7643/issn.1672-9242.2019.10.008 |
| KeyWord:Cf/SiOC composites ceramics coating TaO2 borosilicate glass ablation performance |
| Author | Institution |
| DU Bin |
Harbin Institute of Technology, Harbin , China |
| HONG Chang-qing |
Harbin Institute of Technology, Harbin , China |
| ZHANG Xing-hong |
Harbin Institute of Technology, Harbin , China |
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| Abstract: |
| Objective To improve the ablation resistance property of lightweight carbon fiber reinforced SiOC ceramics (Cf/SiOC). Methods With TaSi2 and MoSi2 as high temperature antioxidant components, SiB6 as sintering assistant and borosilicate glass as binder, multilayer gradient antioxidant coating was prepared on Cf/SiOC composite surface by slurry method. The anti-oxidation and ablative properties of the composite material with coating were tested by oxy-acetylene. And its morphology after morphology was analyzed with SEM. Results Borosilicate glass can obtain a compact coating at low temperature, which can effectively improve the oxygen resistance of the coating and reduce the thermal mismatch between the coating and the substrate. The gradient oxidation resistant coating can be obtained by the slurry method, that was, the coating gradually transited from the porous layer close to the substrate to the densest layer. In the assessment of oxyacetylene ablation experiments, the coating showed excellent ablation resistance, and the ablation behavior was different with different ablation surface temperature. After ablation at 1660 ℃, linear ablation rate and quality ablation rate were 0.03 μm/s, 2.96×10-8 g/(mm2.s); as the ablation temperature increased to 1760 ℃, the linear ablation rate and quality of ablation rate were increased to 0.06 μm/s, 1.03×10-7 g/(mm2.s). After ablative erosion of composite materials with coating, there were no cracks on the surface of coating, but a large number of holes appeared. The main reason was the volatilization of borosilicate glass. The base material did not undergo obvious oxidation, and the coating showed excellent oxidation resistance ability. Conclusion The introduction of borosilicate glass can obtain a compact surface coating at low temperature and improve the oxygen resistance of the coating. The prepared multicomponent antioxidant ablative coating can effectively improve the ablation resistance of Cf/SiOC composite. |
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