硅橡胶基绝热材料高温热行为研究  

Thermal behavior of silicone-rubber based insulation material at high temperature

作　　者：杨栋[1] 张炜[1] 姜本正[1] 

机构地区：[1]国防科技大学航天与材料工程学院,长沙410073

出　　处：《固体火箭技术》2012年第3期396-400,共5页Journal of Solid Rocket Technology

摘　　要：采用高温管式炉在惰性气氛下研究了硅橡胶基绝热材料在1 073～1 873 K的热行为,利用X射线衍射和红外光谱等手段探索了高温固相残余物的产生历程和碳化硅的生成机制,采用热重-差热联用表征了高温固相残余物的热氧化性能。研究结果表明,随着处理温度升高,硅橡胶基绝热材料的固相残余物逐渐向高温陶瓷转化,其热稳定性和耐氧化性相应提高;硅橡胶基体在1 073 K已分解完毕,其固相残余物为碳、硅氧碳化物和SiO2等;随温度上升,有机碳向更加耐氧化的无机碳转变;硅氧碳化物随温度升高向碳化硅转化;气相SiO2高温下由无定型转化为方石英晶体,并与碳发生碳热反应生成碳化硅。The thermal behavior of silicone-rubber based insulation material from 1 073 K to 1 873 K was investigated by tube furnace in inert atmosphere.The formation process of high temperature solid residues and the production mechanism of silicon carbide were studied by X-ray diffraction and Fourier transform infrared spectra.The thermo（oxidative） properties of the solid residues were analyzed by thermogravimetric differential thermal analysis.The results show that the solid residues of silicone-rubber based insulation material are gradually converted into ceramic with temperature increasing;the thermal stability and oxidation resistance of the residues are enhanced in this process.There exist carbon,siliconoxycarbide and silica after the decomposition of silicone rubbers at 1 073K.The transformation of the organic carbon into inorganic carbon with better thermo（oxidative） stability takes place with elevated temperatures.The siliconoxycarbide changes into silicon carbide at higher temperatures.Silicon carbide is also produced by carbothermal reaction between carbon and silica,which follows the crystal transformation of amorphous silica into cristobalite.

关 键 词：硅橡胶基绝热材料 热行为 碳热反应 碳化硅 

分 类 号：V255.3[一般工业技术—材料科学与工程]