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用Rofin-Sinar CW025 YAG激光设备,采用同步送粉的方式进行自熔性Ni-Cr-B-Si合金粉末的激光熔覆,获得了无气孔和裂纹缺陷的熔覆层。借助扫描电子显微镜(SEM,LEO1450)、能谱仪(EDS)、X射线衍射(XRD)对激光熔覆层进行组织、成分及物相分析。研究结果表明,激光熔覆层与C86300铜合金基体实现了良好的冶金结合,激光熔覆层组织主要是γ-Ni,Cr7C3,Ni2B,Ni3B以及少量CrB2和Cr3Si,并且实现了主要元素(Cr,Fe,Ni,Cu和Zn)从基体到熔覆层的梯度分布。
The laser cladding of self-fluxing Ni-Cr-B-Si alloy powder was carried out by using Rofin-Sinar CW025 YAG laser device with synchronous powder feeding, and the cladding layer with no pores and crack defects was obtained. The microstructure, composition and phase analysis of the laser cladding layer were analyzed by scanning electron microscopy (SEM, LEO1450), energy dispersive spectrometer (EDS) and X-ray diffraction (XRD). The results show that the laser cladding layer and the C86300 copper alloy substrate to achieve a good metallurgical bonding, the laser cladding layer is mainly γ-Ni, Cr7C3, Ni2B, Ni3B and a small amount of CrB2 and Cr3Si, and achieved the main elements (Cr, Fe, Ni, Cu and Zn) from the matrix to the cladding.