铸造碳化钨添加量对镍基复合喷熔涂层性能的影响  

Effect of the Casting WC Powder Content on the Performance of WC Reinforced Ni-Based Spray-Fused Coating

作　　者：吴有伍[1] 谭兴龙 吴琴[1] 章诗歧 

机构地区：[1]湖南大学材料科学与工程学院,湖南长沙410082 [2]湖南顶立科技有限公司,湖南长沙341000 [3]无锡福莱达石油机械有限公司,湖南长沙341000

出　　处：《铸造》2013年第9期874-877,共4页Foundry

摘　　要：在镍基合金粉末NiCrBSi中添加不同比例的铸造碳化钨(WC),并采用氧乙炔火焰喷熔工艺在低碳钢表面制备了相应的Ni基WC复合涂层。采用金相显微镜观察了涂层的显微组织,采用湿砂橡胶轮式磨粒磨损试验机测试了涂层的抗磨粒磨损性能,并采用扫描电镜观察了喷熔粉末和喷熔层磨损后的形貌。结果表明:喷熔层的组织为在NiCr合金基体上弥散分布着不同粒度的碳(硼)化物硬质相;涂层的显微组织和WC的含量对Ni基WC喷熔层的硬度和抗磨损性能影响很大,涂层的硬度和抗磨损性能随WC添加量的增加先增加后减小;当WC的含量为35%时,Ni基体WC喷熔涂层的硬度最高,相应的抗磨粒磨损性能最好。Ni-based NiCrBSi self-fluxing alloy composite coatings with different content of casting WC were prepared by oxy-acetylene flame spray-fuesed process.Cross-sectional microstructures of these coatings were investigated by optics microscope （OM） and their wear behaviors were explored by a MLS-225 wet sand rubber wheel abrasive wearing tester.The micrograph of the powder and the worn surfaces of the coatings were examined by scanning electron microscopy （SEM）.The results show that the microstructures of the spray-fused coating are composed of NiCr alloy,carbides and borides.The hardness and wear resistance of the spray-fused Ni-based WC coatings were greatly influenced by their microstructure and WC content.The hardness and wear resistance of the coatings firstly increased and then decreased with the WC content increase,the coating with casting WC content of 35％ exhibited the highest hardness and abrasive wear resistance.

关 键 词：磨粒磨损 喷熔 涂层 镍基自熔性合金 碳化钨 

分 类 号：TG174.44[金属学及工艺—金属表面处理]