时效处理对TiC增强铜基复合材料组织与性能的影响

Effect of aging treatment on microstructure and performance of TiC reinforced copper matrix composites

为了提高铜基复合材料的综合性能,采用机械合金化法制备混合碳化钛的过饱和铜钛合金粉,压制后烧结成型,制备以Ti作为耦合剂的TiC增强Cu基复合材料并进行时效处理。通过组织观察、性能测试等手段,分析时效处理对复合材料组织和性能的影响。结果发现:TiC含量越高,复合材料的硬度越高,但电导率和耐腐蚀性却有所下降;同时复合材料表面的增强相越分散,气孔增加,但总体分布较均匀,且与基体结合较好。在时效处理后,耦合剂Ti与基体Cu析出的第二相Cu_(4)Ti会影响材料的组织与性能,表现为复合材料表面气孔减少,硬度、电导率、致密度和耐腐蚀性比时效处理前均有所提高。

In order to improve the comprehensive properties of copper matrix composites,the supersaturated Cu-Ti alloy powder mixed with titanium carbide was prepared by mechanical alloying method.After the prepared powder pressed and sintered,the TiC reinforced Cu matrix composite with Ti as coupling agent was prepared and aged.The effect of aging treatment on the microstructure and properties of composites was analyzed by microstructure observation and property test.The results show that the higher the content of TiC,the higher the hardness of the composites,but the conductivity and corrosion resistance decrease.At the same time,the more dispersed the reinforcing phase on the surface of the composite,the more pores increase,but the overall distribution is more uniform and the combination with the matrix is better.After aging treatment,the second phase Cu_(4)Ti precipitated from couplant Ti and matrix Cu can affect the microstructure and properties of the composite,which is manifested in the reduction of pores on the surface of the composite,and the improvement of hardness,conductivity,density and corrosion resistance than before aging treatment.