| 杜斌,洪长青,张幸红.轻质Cf/SiOC复合材料表面抗氧化涂层烧蚀性能的研究[J].装备环境工程,2019,16(10):49-54. DU Bin,HONG Chang-qing,ZHANG Xing-hong.Ablation Performance of Anti-oxidation Coatings on Surface of Lightweight Cf/SiOC Composite[J].Equipment Environmental Engineering,2019,16(10):49-54. |
| 轻质Cf/SiOC复合材料表面抗氧化涂层烧蚀性能的研究 |
| Ablation Performance of Anti-oxidation Coatings on Surface of Lightweight Cf/SiOC Composite |
| 投稿时间：2019-05-30 修订日期：2019-06-24 |
| DOI：10.7643/issn.1672-9242.2019.10.008 |
| 中文关键词: Cf/SiOC复合材料 陶瓷涂层 TaO2 硼硅玻璃 烧蚀性能 |
| 英文关键词:Cf/SiOC composites ceramics coating TaO2 borosilicate glass ablation performance |
| 基金项目:国家自然科学基金(11572353, 11121061，91216301) |
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| 中文摘要: |
| 目的 提高轻质碳纤维增强SiOC(Cf/SiOC)多孔陶瓷复合材料的抗烧蚀性能。方法 用TaSi2、MoSi2为高温抗氧化组分，SiB6为烧结助剂，硼硅酸玻璃为粘结剂，采用浆料法在Cf/SiOC复合材料表面制备多层梯度化抗氧化涂层。用氧乙炔考核带涂层复合材料的抗氧化及抗烧蚀性能，并通过扫描电子显微镜对烧蚀后的形貌进行分析。结果 采用硼硅酸玻璃能够在较低的温度下获得表面致密的涂层，有效地提升涂层的阻氧能力，同时能够降低涂层与基体材料之间的热失配。通过浆料法能够获得梯度化的抗氧化涂层，即涂层由靠近基体部分的多孔层逐渐过渡至最外层的致密层。在氧乙炔考核烧蚀实验下，涂层表现出优良的抗烧蚀性能，并且随着表面烧蚀温度的不同，表现出不同的烧蚀行为。在1660 ℃下烧蚀后，线烧蚀率及质量烧蚀率分别为0.03 μm/s，2.96×10-8 g/(mm2.s)，随着烧蚀温度增加至1760 ℃，线烧蚀率及质量烧蚀率增加至0.06 μm/s，1.03×10-7 g/(mm2.s)。带涂层的复合材料烧蚀后，涂层表面没有裂纹，但都出现了大量的孔洞，其主要原因是硼硅酸玻璃的挥发，基体材料并没有发生明显的氧化，涂层表现出优良的抗氧化、阻氧能力。结论 硼硅酸玻璃的引入能够在较低的温度下获得表面致密的涂层，提升涂层的阻氧能力。制备的多组分抗氧化烧蚀涂层，可以有效地提高Cf/SiOC复合材料的抗烧蚀能力。 |
| 英文摘要: |
| 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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