铸铁等离子熔覆铁基合金耐磨涂层  

Wear-resistant coating of Fe-based alloy by plasma cladding on cast iron

作　　者：彭竹琴[1] 商全义[1] 卢金斌[1] 吴玉萍[2] 

机构地区：[1]中原工学院材料与化学工程系,郑州450007 [2]河海大学材料科学与工程学院,南京210098

出　　处：《焊接学报》2008年第4期61-64,116,共5页Transactions of The China Welding Institution

基　　金：江苏省自然科学基金资助项目(BK2004117)

摘　　要：利用等离子熔覆技术,选择合适的工艺参数,在硼铸铁基体上熔覆铁基合金粉末制备具有冶金结合的耐磨涂层。采用金相显微镜、X射线衍射仪、扫描电镜研究了涂层的组织,利用显微硬度计测试了涂层的显微硬度,通过环-块磨损试验评估了涂层的耐磨性。结果表明,硼铸铁等离子熔覆铁基合金涂层组织主要由(Cr,Fe)7C3,α-(Fe,Cr)和Fe3C相组成;涂层的显微硬度可达600~1 200 HV 0.2;在干滑动磨损条件下,涂层的耐磨性约是基体试样的5倍。涂层中高硬度的(Cr,Fe)7C3及Fe3C相的抗磨骨架作用,大量Cr,Si原子溶入基体引起的过饱和固溶强化作用,涂层快速加热及快速凝固产生的细晶强化作用是涂层耐磨性提高的主要原因。By plasma cladding technology a wear-resistant coating with metallurgical bonding to substrate was prepared on boron cast iron with Fe-based alloy powder.The microstructure of the bondng coating was investigated by optical microscope(OM),scanning electron microscope(SEM),X-ray diffractometer(XRD).The microhardness was tested by microhardness tester.The wear resistance performance of the coating was evaluated on a MM-200 block-on-wheel sliding wear tester.The results show that the coating has a microstructur...

关 键 词：等离子熔覆 组织 显微硬度 耐磨性 

分 类 号：TG174.4[金属学及工艺—金属表面处理]