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采用理论计算与实验相结合的方法对金刚石混杂SiC/Al复合材料的热物理性能进行研究,采用微分有效介质(DEM)理论和扩展的Turner模型分别计算金刚石混杂SiC/Al复合材料的热导率和热膨胀系数。从金刚石混杂SiC/Al复合材料的微观组织可以看到SiC颗粒与Al之间结合较紧密,金刚石颗粒与Al之间结合不紧密。金刚石混杂SiC/Al复合材料的热物理性能的实验结果与理论计算趋势一致。当金刚石颗粒与SiC颗粒的体积比为3:7时,混杂SiC/Al复合材料的热导率和热膨胀系数分别提高了39%和30%。因此,当在复合材料中加入少量金刚石颗粒时,其热物理性能得到显著提高,而复合材料的成本略有提高。
The thermal-physical properties of diamond-hybrid SiC / Al composites were studied by theoretical calculation and experiments. The thermal conductivity of diamond-hybrid SiC / Al composites was calculated by using differential effective medium (DEM) theory and extended Turner model And coefficient of thermal expansion. From the microstructure of the hybrid SiC / Al composites, it can be seen that the bonding between SiC particles and Al is more compact and the bonding between diamond particles and Al is not close. The experimental results of thermophysical properties of diamond hybrid SiC / Al composites are consistent with the theoretical calculations. When the volume ratio of diamond particles to SiC particles is 3: 7, the thermal conductivity and thermal expansion coefficient of the hybrid SiC / Al composites increase by 39% and 30% respectively. Therefore, when adding a small amount of diamond particles to the composite material, the thermal physical properties are significantly improved, while the cost of the composite material is slightly increased.