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以钴为主体的涂层原材料粉术中添加Ni,Cr,Fe,C,Si,W,MgO,Y2O3和纳米Al粉等形成新型合金粉末体系,在结晶器用Cu-Cr合金表面利用脉冲激光原何制备颗粒增强Co基合金涂层。应用金相显微镜、扫描和透射电镜等分析技术,对实验制备样品涂层的组织结构进行研究。结果表明,在优化了粉末成分及激光扫描工艺参数(50W,15Hz,3ms,4.0mm/s)条件下,制备出了与Cu合金基体界面冶金结合的钴基合金涂层;在涂层内部以Co-Cr-W-C为主体元素形成了细晶、高硬度的合金组织,涂层中原位生成了细小的陶瓷颗粒相,起刮了复合强化作用,而W,Cr等强碳化物在基体中析出,起到了弥散强化的作用。涂层中过渡层富Co区的出现导致了富Cu区的产生。
A new type of alloy powder system was formed by adding Ni, Cr, Fe, C, Si, W, MgO, Y2O3 and nano-Al powder to cobalt-based coating raw material powder technology. Pulsed laser light was used on the surface of the Cu- How to prepare particle reinforced Co-based alloy coating. The microstructure of the sample prepared by experiment was studied by metallographic microscope, scanning and transmission electron microscopy. The results show that under the conditions of 50W, 15Hz, 3ms and 4.0mm / s, the cobalt-based alloy coating bonded with Cu alloy matrix metallurgy was prepared. Co-Cr-WC as the main element of the formation of fine-grained, high-hardness alloy, the coating generated in situ small ceramic particles phase, played the role of composite strengthening, and W, Cr and other carbide precipitation in the matrix , Played a dispersion strengthening role. The presence of a Co-rich region in the coating causes the formation of a Cu-rich region.