摘要
采用热压工艺制备了ZrCp/W系列复合材料 ,分析测试了温度和ZrC含量对复合材料的热物理性能的影响规律。结果表明 :随着温度的升高 ,复合材料的比定压热容和平均线膨胀系数单调增大 ,热导率略有增大。随ZrC含量的增加 ,复合材料的比定压热容和平均线膨胀系数线性增大 ,基本满足混合定律。热导率对材料的组织结构比较敏感 ,随ZrC含量的增加而急剧减小。热导率的实测值大大低于理论计算值 ,这主要是由晶界和孔洞等缺陷对导热粒子的强烈散射作用造成的。
Zirconium carbide particle-reinforced tungsten matrix (ZrCp/W) composites were fabricated by hot-pressing technique. The effects of temperature and ZrCp content on the thermophysical properties of the composites were investigated. The results show that with the increase of temperature, the specific capacity and the coefficient of thermal expansion increase monotonically, the thermal conductivity increases slightly. The specific capacity and the coefficient of thermal expansion of the ZrCp/W composites increase with ZrCp content increasing, which is in accord with the mixture rule. The thermal conductivity of the ZrCp/W composites, which are sensitive to microstructure of the composites, decrease greatly with ZrCp content increasing. The experimental results of the thermal conductivity are considerably lower than the predicted ones, which mainly due to the diffraction effect of the defects like grain boundary and pores on thermal conducting-particles.
出处
《粉末冶金技术》
EI
CAS
CSCD
北大核心
2002年第5期263-266,共4页
Powder Metallurgy Technology
基金
航天工业总公司重点资助项目 (批准号 :18 10 3 1)
关键词
热物理性能
磷化锆/钨基复合材料
热压成型
Hot pressing
Microstructure
Thermal conductivity
Thermodynamic properties
Tungsten
Zirconium compounds
