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Microstructure and wear performance of WC reinforced Ni-based composite coating
Author(s): 
Pages: 116-120
Year: Issue:  3
Journal: TRANSACTIONS OF MATERIALS AND HEAT TREATMENT

Keyword:  磨损喷焊涂层镍基自熔性合金;
Abstract: 采用扫描电镜、电子探针、X射线衍射和透射电镜技术分析了氧乙炔火焰喷焊WC增强镍基自熔性合金复合涂层的组织结构,并采用湿砂橡胶轮式磨粒磨损试验机对该涂层与等离子喷涂NiCr/Cr3C2涂层的磨损性能进行了实验比较.结果表明,复合喷焊层内形成了γ-Ni固溶体基体,其中弥散分布着大量细小的碳化物硬质相Cr3C2、B4C、Cr7C3、Cr23C6等.WC颗粒仅在边缘处发生部分溶解,与涂层基体形成了冶金结合,周围生成针状的碳化铬枝晶.该组织决定了喷焊层基体具有较高的硬度,WC增强颗粒与基体之间具有很高的结合强度.复合喷焊层具有很好的耐磨粒磨损性能,其磨损失重量仅为NiCr/Cr3C2涂层的57%.
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