Oxidation behaviors of C/SiC composites coated with SiC coatings containing borosilicate glass
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摘要: 以2D C/SiC复合材料为基底, 采用聚合物裂解工艺(Polymer plyen)制备了含硼硅玻璃SiC自愈合涂层。利用扫描电镜对含硼硅玻璃SiC涂层的2D C/SiC复合材料氧化前后的微结构形貌进行了分析。研究了含硼硅玻璃SiC涂层的C/SiC复合材料在静态空气中700℃、 1000℃和1200℃下的氧化行为, 并分析了涂层层数对C/SiC复合材料氧化行为的影响。结果表明: 含硼硅玻璃SiC涂层在该温度下形成的玻璃相可以较好地封填表面缺陷(裂纹和孔洞); 并且随温度升高及涂层层数增加, 试样在氧化过程中质量减少率降低, 氧化后的强度保持率提高。Abstract: SiC self-healing coatings containing borosilicate glass were prepared by polymer plyen on the 2D C/SiC composites. The microstructure morphologies of the 2D C/SiC composites with SiC coating containing borosilicate glass before and after oxidation were analyzed by SEM. The oxidation behaviors of the C/SiC composites with SiC coating containing borosilicate glass were studied at 700℃, 1000℃ and 1200℃ in static air and the oxidation behaviors resulted by different layers were analyzed. The results show that the glass phase produced by the SiC coating containing borosilicate glass can seal the defections (cracks and pores) existed in the coating, and with increasing the temperature and number of the coating layers, the C/SiC composites have lower mass loss during the oxidation and higher strength retention after oxidized.
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Key words:
- 2D C/SiC composites /
- borosilicate glass /
- self-healing coating /
- oxidation /
- morphology /
- mass change /
- residual strength
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