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利用激光熔覆技术,将氧化钽和石墨的混合粉末添加到Ni60包WC的镍基合金粉末中,成功制备了TaC/WC复合涂层。使用扫描电镜(SEM)、X射线衍射仪(XRD)等仪器分析了镍基合金复合涂层横断面的显微组织,并对其硬度进行研究分析。结果表明在基体与涂层之间形成了良好的冶金结合,复合涂层不仅含有γ-Ni树枝晶、W_2C、M_7C_3、以及大量弥散分布的TaC颗粒。复合涂层的硬度HV可达9650 MPa,是Ni60涂层的1.3倍,这主要是因为TaC颗粒的分布促使其内部组织结构改变以及相变引起的硬度上升。
The laser cladding technique was used to fabricate a TaC / WC composite coating by adding a mixed powder of tantalum oxide and graphite to a nickel-based alloy powder of Ni60 clad WC. The microstructure of the cross section of the Ni-based alloy composite coating was analyzed by scanning electron microscope (SEM), X-ray diffraction (XRD) and other instruments. The hardness of the Ni-based alloy composite coating was analyzed. The results show that there is a good metallurgical bond between the substrate and the coating. The composite coating contains not only γ-Ni dendrites, W_2C, M_7C_3, but also a large amount of dispersed TaC particles. The hardness of the composite coating HV can reach 9650 MPa, which is 1.3 times that of the Ni60 coating, mainly because the distribution of TaC particles promotes the change of its internal structure and the hardness increase caused by phase transformation.