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本文制备纳米SiC基体改性的SiC-C/C复合材料,利用X射线衍射技术、高分辨率透射电镜等研究SiC对碳材料的石墨化度的影响.纳米SiC能够显著促进碳基体材料的石墨化度,同时通过高分辨率透射电镜在纳米SiC颗粒周围观测到明显的石墨化结构,并且距离SiC越近,碳基体的石墨化程度越高.通过静态氧化实验研究SiC-C/C复合材料的抗氧化性能.结果表明,随着SiC加入量的增加复合材料的抗氧化性显著提高,纳米SiC在高温下生成较为均匀的Si O2保护层,覆盖在碳材料的表面,阻碍氧气与碳材料的接触,并且SiC含量越高,形成的保护层越厚,抗氧化能力越强.
The effect of SiC on the graphitization degree of carbon materials was studied by X-ray diffraction (XRD) and high-resolution transmission electron microscopy (TEM) .Nano-SiC can significantly improve the mechanical properties of carbon matrix composites such as graphite At the same time, the obvious graphitization structure was observed around the nano-SiC particles by high-resolution transmission electron microscopy, and the graphitization degree of the carbon matrix was higher from the closer to SiC. Through the static oxidation experiments, the SiC-C / C composites The results showed that the oxidation resistance of the composites increased remarkably with the addition of SiC, and the relatively uniform Si O2 protective layer was formed at high temperature by the nano-SiC, covering the surface of the carbon material and hindering the oxygen and carbon materials Of the contact, and the higher the SiC content, the thicker the protective layer formed, the stronger the oxidation resistance.