反应球磨热压烧结制备SiC_p/Cu复合材料的耐磨性能研究

The Study on Wear Resistance of SiC Particle Reinforced Cu Matrix Composites Prepared by Reaction Milling and Hot Pressed Sintering

以粒度均不大于37μm的Si粉、石墨粉和铜粉为原料,采用反应球磨热压烧结制备了SiC颗粒增强铜基复合材料。采用金相显微镜、SEM等分析手段对制备的复合材料进行组织观察,并对其进行硬度、致密度和耐磨性测试。结果表明,增强相除少量团聚外在基体上均匀弥散分布,增强相与基体相结合良好。铜基复合材料硬度随着增强相含量和烧结温度的升高而变大,增强相含量的影响比烧结温度的影响更显著,铜含量90%时材料的硬度达到135.16 HV,相比纯铜硬度提高了98.88%。材料致密度随烧结温度升高而升高,增强相含量较高时较为显著。随着增强相含量的升高材料的致密度和磨损率均下降。铜含量90%时材料的磨损率为铜含量95%材料磨损率的35%。

The reaction milling and hot pressed sintering technique was used to prepare SiC particle reinforced copper matrix composites,Si powder,graphite powder and copper powder was used as raw material with mean particle size of less than 37 μm.The microstructure of prepared composites was observed by SEM,metallographic microscope analysis,and the hardness,the density and the wear resistance were tested.The results indicate that the most of reinforced phases distribute on Cu matrix uniformly besides minor reunion,meanwhile the reinforced phases and matrix phases connect well.The hardness of copper matrix composites increases with the increase of the reinforced phase content and sintering temperature,the impact of reinforced phase content is more significant than the sintering temperature.The hardness achievesl35.16 HV when the copper content come to 90%,increases by 98.88%compared to the pure copper.The density increases as increasing sintering temperature,which is obvious when phase content is higher.Both of the density and wear rate decline as the reinforced phase content increasing.The wear rate of copper matrix composites with 90%Cu is 35%of the composites with 95%.Cu.