活塞用铜基SiC颗粒复合材料的制备及性能试验研究

Test Research on Preparation and Performance of Cu Base SiC Particles Composite Material for Piston

通过制备活塞用铜基SiC颗粒复合材料,实验测试不同球磨时间下的微观组织,分析复合材料的相对密度和硬度变化。结果表明:经过球磨后,在SiC颗粒的表面粘接了较多Cu的大小颗粒,获得较好的包覆效果。随着球磨时间的延长,颗粒粒径逐步得到细化,颗粒粒径分布在0.8～5.0μm之间,而且颗粒形状更为规则,提高了包覆层的粘结强度。同时,复合材料的相对密度呈现先增加后减小的变化,硬度呈现单调增加的变化;随着SiC含量的增加,复合材料硬度表现出单调增加的变化,相对密度表现出单调减小的变化。研究结论为扩展铜基SiC颗粒复合材料的实际应用提供参考数据。

The preparation of copper matrix SiC particles composite for piston was made, and the microstructure under different time of ball mill was tested, and the relative density and hardness change rule were analyzed. Results show that the surface of the SiC particles is polygonal adhesive for more Cu particles after the mechanical ball grinding, and the Cu surface appeares a good coating effect. With the longer duration of ball mill, the changing process of particles is further refinement. The particle size distribution is between 0.8 μm to 5 μm, and the particle shape is more regular, which improves the bond strength of cladding layer. Meanwhile, the relative density of composites increases at first and then decreases, and the hardness increases monotonously. With the increase of the content of SiC, the hardness scale of composite material shows the change of monotone increasing, the relative density decreass monotonously. The research conclusion can improve the copper matrix SiC particles composite application and it laids a foundation for the composite material.