SiO_2-AlN复合材料的热物理性质  

Investigation on thermophysical properties of SiO_2 AlN composites

作　　者：吴洁华[1] 李包顺[1] 郭景坤[1] 

机构地区：[1]中国科学院上海硅酸盐研究所,上海200050

出　　处：《航空材料学报》1999年第3期37-42,共6页Journal of Aeronautical Materials

摘　　要：研究了ＡｌＮ 引入量和温度对ＳｉＯ２－ＡｌＮ 复合材料的热膨胀系数和热导率的影响，并对影响ＳｉＯ２－ＡｌＮ复合材料抗热震性的诸因素做了分析。结果表明，ＳｉＯ２－ＡｌＮ 复合材料的热膨胀系数随温度的提高而增加；在同一温度下，复合材料的热膨胀系数在４００℃以上随ＡｌＮ 引入量的增加而增加。ＳｉＯ２－ＡｌＮ 复合材料的热扩散率和热导率随热压温度的提高而增加。ＳｉＯ２－ＡｌＮ复合材料的临界淬冷温度在６００℃左右。Thermophysical properties of SiO 2 AlN composites as a function of temperature and the content of AlN particles were investigated.The theoretical analysis of thermal shock resistance of SiO 2 AlN composites was also studied.The results showed that thermal expansion coefficient of SiO 2 AlN composites increased with temperature;while in the same temperature thermal expansion coefficient increased with the content of AlN particles above 400℃.Thermal diffusivity and thermal conductivity of SiO 2 AlN composites increased with hot pressing temperature.Retained flexural strength of SiO 2 AlN composites decreased abruptly when temperature difference was above 600℃ because of the heavy mismatch of thermal expansion coefficient between SiO 2 matrix and AlN particles.

关 键 词：石英 氮化铝 复合材料 热膨胀系数 热导率 

分 类 号：TB330.3[一般工业技术—材料科学与工程]