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采用碳化硅微粉作为红外遮光剂,通过干法成型工艺制备了具有优良高温绝热性能的气相二氧化硅/碳化硅复合绝热材料。利用场发射扫描电镜、热重–差热分析、导热系数测定等方法对复合材料的微观结构和热性能进行分析,研究了SiC粒度、添加量和复合材料密度对复合材料绝热性能的影响。结果表明:SiC的引入可明显降低红外辐射传热,有效提高材料高温绝热性能;当复合材料使用温度为500℃时,较适宜的SiC添加量为25%(质量分数),平均粒径约为3.029μm;此外,在满足材料力学性能要求的同时应尽可能降低其密度。
Using silicon carbide powder as infrared sunscreen agent, a fumed silica / silicon carbide composite insulation material with excellent high temperature thermal insulation performance was prepared by a dry molding process. The microstructure and thermal properties of the composites were analyzed by field emission scanning electron microscopy, thermogravimetry-differential thermal analysis and thermal conductivity measurement. The effects of SiC particle size, loading and composite density on the thermal insulation properties of the composites were investigated. The results show that the introduction of SiC can significantly reduce the heat transfer of infrared radiation and effectively improve the thermal insulation properties of the material. When the composite temperature is 500 ℃, the suitable SiC content is 25% (mass fraction), the average particle size is about 3.029μm; In addition, to meet the mechanical properties of materials should be as low as possible while reducing its density.