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以高温盐浴法对天然鳞片石墨粉体(GF)进行表面TiC镀层处理,然后采用真空热压烧结法制备TiCGF/Cu复合材料,研究了粉体表面涂层和GF体积分数对复合材料微观结构、热导率及抗弯强度的影响。系列测试结果表明:随着GF体积分数的降低以及粉体表面TiC镀层的形成,TiC-GF/Cu复合材料平行于GF片层方向的热导率有所降低,抗弯强度有所提升。其中在GF的体积分数占TiC-GF/Cu复合材料70%时,这种变化最为明显,平行于GF片层方向的TiC-GF/Cu复合材料热导率下降幅度最大,从676W/(m·K)下降到526 W/(m·K)。同时,TiC-GF/Cu复合材料的微观结构进一步说明,GF表面的TiC涂层对GF/Cu复合材料的断裂模型起着重要的作用。
TiF coating on natural flake graphite powder was carried out by high temperature salt bath method. TiCGF / Cu composite was prepared by vacuum hot-pressing sintering. The effect of powder coating thickness and GF volume fraction on the microstructure of composite , Thermal conductivity and flexural strength. The results show that the thermal conductivity of TiC-GF / Cu composites decreases with the decrease of GF volume fraction and the formation of TiC coating on the surface of the TiC-GF / Cu composites, and the flexural strength is improved. The most obvious change is in the volume fraction of GF accounted for 70% of the TiC-GF / Cu composites. The thermal conductivity of TiC-GF / Cu composites decreases most sharply from 676W / (m · K) to 526 W / (m · K). Meanwhile, the microstructure of TiC-GF / Cu composites further shows that the TiC coating on GF surface plays an important role in the fracture model of GF / Cu composites.