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采用超声波震荡法将SiC微粉添加到二维针刺碳毡预制体中,利用热梯度化学气相浸渗工艺沉积热解碳制备了SiC改性碳纤维增强碳基(carbonfiber reinforced carbon,C/C)复合材料。借助X射线衍射与扫描电子显微镜检测和观察材料的微观结构,利用氧–乙炔烧蚀实验测试材料的抗烧蚀性能。结果表明:SiC微粉弥散分布在C/C复合材料基体中,经氧–乙炔烧蚀30 s后,线烧蚀率和质量烧蚀率分别为4.0×10–3 mm/s和3.19×10–3 g/s,分别相当于C/C复合材料的47.1%和70.6%,表明SiC的加入显著提高了C/C复合材料的抗烧蚀性能,其优良的抗烧蚀性主要是因为SiC颗粒相的加入在烧蚀过程中具有抑制氧化和弥补缺陷的作用,降低了C/C复合材料的热化学烧蚀。
Abstract：SiC modified carbon fiber reinforced carbon(C/C) composites were prepared by adding SiC micropowder to the carbon fiber preform before thermal gradient chemical vapor infiltration densification by using an ultrasonic vibration infiltration.The mi-crostructure of composites was studied by X-ray diffraction and scanning electron microscopy.The ablation property of the compos-ites was investigated by using oxyacetylene ablation equipment.The results show that,SiC particles are mainly distributed among the pryocarbons.The linear ablation rate and mass ablation rate of the SiC modified C/C composite are 4.0 × 10–3 mm/s and 3.19 × 10–3 g/s while after ablated for 30s,which were 47.1% and 70.6% of the C/C composite,respectively.The introduction of SiC particles can obviously improve ablation property of the C/C composite,which is attributed to that the addition of SiC particles to C/C composite can effectively prevent oxidation and remedy defects which reduce thermochemical oxidation in the oxygen–acetylene.
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基本信息:
DOI：10.14062/j.issn.0454-5648.2011.02.029
中图分类号:TB332
引用信息:
[1]魏连锋,李克智,吴恒,等.SiC改性C/C复合材料的制备及其烧蚀性能[J].硅酸盐学报,2011,39(02):251-255.DOI:10.14062/j.issn.0454-5648.2011.02.029.
基金信息:
高等学校学科创新引智计划(B08040);; 国家自然科学基金(510-72166)资助项目
2011-02-15
2011-02-15