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为了研究质量分数为15%FeS的Cu-FeS自润滑材料内部结构与导热性能的关联,采用分子动力学的方法,在考虑界面热阻的情况下构建原子模型,对增强相和复合材料导热性能进行模拟研究。结果表明:FeS在600 K、900 K时会发生有利于热传导的结构变化,系统界面热阻随着FeS尺寸的增大而减小,颗粒大于100 nm时,界面热阻趋于一定值。通过计算所得导热率与实验数值较接近,误差的引起是由于计算没有考虑温度升高对界面结合的破坏、界面的不完整性、基体内部缺陷、弥散相的大小等因素。验证了Hasselman-Johnson方法对于预测该复合材料的合理性。
In order to study the relationship between the internal structure and thermal conductivity of Cu-FeS self-lubricating material with mass fraction of 15%, the molecular dynamics method was used to construct the atomic model considering the thermal resistance of the interface. The thermal conductivity of the reinforced phase and the composite Conduct simulation studies. The results show that the thermal conductivities of FeS change at 600 K and 900 K, and the thermal interface resistance of the system decreases with the increase of FeS size. When the particle size is larger than 100 nm, the interface thermal resistance tends to a certain value. The calculated thermal conductivity is close to the experimental value. The error is caused by the fact that the calculation does not take into account factors such as the damage of interface bonding, the interface imperfection, the internal defects of the matrix and the size of the dispersed phase. The validity of Hasselman-Johnson method for predicting the composites is verified.