采用熱壓燒結(jié)工藝制備了 Ti Cp/ W系列復合材料 ,分析測試了溫度和 Ti C含量對復合材料的熱物理性能的影響規(guī)律。結(jié)果表明 :隨著溫度的升高 ,復合材料的定壓比熱和平均線膨脹系數(shù)單調(diào)增大 ,熱擴散率稍有減小 ,熱導率略有增大。隨 Ti C含量的增加 ,復合材料的定壓比熱和平均線膨脹系數(shù)線性增大 ,基本滿足混合定律。熱擴散率和熱導率對材料的組織結(jié)構(gòu)比較敏感 ,二者均隨 Ti C含量的增加而急劇減小。熱導率的實測值大大低于理論計算值 ,這主要是由晶界和孔洞等缺陷對導熱粒子的強烈散射作用造成的。
Abstract:
Titanium carbide particle reinforced tungsten matrix (TiC p/W) composites were fabricated using a hot pressing technique The effects of temperature and TiC p content on the thermophysical properties of the composites have been investigated The results show that as temperature increases, specific heat and coefficient of thermal expansion increase monotonically, thermal diffusivity decreases slightly, and thermal conductivity increases gradually The specific heat and the coefficient of thermal expansion of TiC p/W composites increase with increasing TiC p content, according to the mixture ruler The thermal diffusivity and conductivity of TiC p/W composites, which are sensitive to microstructure, decrease greatly with increasing TiC p content The experimental values of the thermal conductivity are considerably lower than the theoretical ones as result of diffraction from defects such as grain boundary and pores in the thermal conducting particles
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王玉金,周玉,宋桂明,雷廷權(quán). TiC_p/W復合材料的熱物理性能[J].稀有金屬材料與工程,2000,(6).[Wang Yujin, Zhou Yu, Song Guiming, Lei Tingquan. Thermophysical Properties of TiC_p/W Composites[J]. Rare Metal Materials and Engineering,2000,(6).] DOI：[doi]