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气相二氧化硅/碳化硅复合绝热材料的制备与表征(英文)
作者:封金鹏 倪文 陈德平 许为峰 胡子君 孙陈诚  
单位:北京科技大学土木与环境工程学院 航天材料及工艺研究所先进功能复合材料技术国防科技重点实验室  
关键词:气相二氧化硅  碳化硅  遮光剂  导热系数 
分类号:TB332
出版年,卷(期):页码:2009,37(12):2108-2111
DOI:
摘要:

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。

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Fumed silica/SiC thermal insulating composites were successfully prepared. SiC was adopted as an opacifier to improve thermal insulating performance of the composites at higher temperatures where the radiative heat transfer dominates. The composites were characterized by using field emission scanning electron microscopy, thermogravimetric–differential thermal analysis and thermal conductivity measurement. The effects of particle size and content of SiC, and the bulk density of the composites on thermal conductivity of the composites were investigated. The results show that SiC powder in the composite can effectively lower thermal conductivity via scattering or reflecting infrared heat radiation. When the composites are applied at 500 ℃ , the suitable mass fraction and mean diameter of SiC are about 25% and 3.029 μm, respectively. The bulk density of the composites should be minimized as much as possible for the excellent thermal insulating performance at high temperatures.

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基金项目:
国防科技重点实验室基金(9140C56060C56)资助项目
作者简介:
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参考文献:

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