一种新的β-锂霞石增强铜基复合材料热性能

Thermal properties of Cu matrix composite containing β-eucryptite particle

采用热压烧结工艺成功制备了一种新的β-锂霞石增强铜基复合材料.利用扫描电镜和透射电镜对复合材料的微观组织进行了分析,并对不同体积分数复合材料的致密性,热膨胀性能和热传导性能进行了测试.结果表明:β-锂霞石颗粒在铜基体中分布均匀,界面清晰,不发生界面反应;体积分数对复合材料致密性、热膨胀系数和热导率有明显影响,当β-锂霞石颗粒体积分数超过40%时,复合材料的致密性有明显下降,热膨胀系数在(9～15.4)×10-6/K,同时热导率在50～170W/m·K.

A new kind of copper matrix composites with different volume fractions of β-eucryptite （Euc） particles was successfully fabricated by hot-pressed sintering. The microstructure of Euc/Cu composites was studied by scanning electron microscope and transmission electron microscope. The thermal physical properties of Euc/Cu composites were analyzed by means of thermal dilatometer and thermal conductivity tester. Results show that the effects of volume fraction of β-eucryptite particles on the thermal expansion coefficient and thermal conductivity of the composites are significant. When the volume fraction of β-eucryptite particles is more than 40% ,the compactness of Euc/Cu composites decreases obviously. The thermal expansion coefficient of the composites is in the range of （9-15. 4） × 10-6 /K,which is much lower than that of copper,and thermal conductivity of the composites is 50-170 W/m·K.