WC颗粒增强Fe基合金涂层的显微组织与耐磨性能

Microstructure and wear resistance of WC particle reinforced Fe based alloy coating

利用等离子体喷焊(PMI)在45钢表面制备了WC颗粒增强Fe基合金复合涂层。在PMI过程中,应用了不同的电压参数,并采用扫描电镜(SEM)、X射线衍射仪(XRD)和能谱仪(EDS)分别对涂层组织结构及成分进行了分析;并采用自制摩擦磨损测试仪进行了磨损特性分析。SEM分析结果表明,涂层与基体材料冶金结合无裂纹,WC颗粒在涂层中均匀分布。此外,涂层的主要相包括WC、W_(2)C、Cr_(23)C_(6)、Fe_(3)W_(3)C、Cr_(3)C_(2)和Cr_(7)C_(3),涂层的最大硬度约为1600 HV。摩擦磨损特性分析结果表明,含WC颗粒的等离子涂层与Fe基合金涂层相比,磨损量减少了50%以上,磨损的主要机理是磨料磨损,大量的WC颗粒阻碍了微切割,具有较高的耐磨性。

Plasma melt injection(PMI)was used to prepare WC particles reinforced metal matrix composites layer on the 45 steel.During the PMI process,different voltage parameters were applied.The clad coating were analyzed by optical microscope(OM),scanning electron microscopy(SEM),X-ray diffraction(XRD)and energy dispersive spectrometer(EDS)to study microstructure,phase composition and chemical compositions of the clad coating.And a self-made friction and wear tester was used for wear characteristics analysis.SEM analysis result reveals that the clad coating,being metallurgical bonding with base material,is crack-free,and the WC particles distribute uniformly in the clad coating.In addition,the primary phase of the clad coating contains WC,W_(2)C,Cr_(23)C_(6),Fe_(3)W_(3)C,Cr_(3)C_(2) and Cr_(7)C_(3).The maximum hardness of the clad coating is about 1600 HV.The friction and wear test results show that the wear loss of the plasma clad coating with WC reduces by more than 50% compared with that of the Fe based alloy coating.The main mechanism of wear is abrasive wear,with a large number of WC particles hindering micro cutting and exhibiting high wear resistance.