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利用激光熔覆技术,在6063Al表面制备了添加有La2O3、Y2O3、Ce O2的Ni60合金熔覆层,并通过SEM、XRD、显微硬度计和摩擦磨损试验机等设备的测试分析,研究稀土氧化物对6063Al表面Ni基激光熔覆层组织结构、硬度及摩擦磨损性能的影响.结果表明:不同成分熔覆层的主要相结构均为β-Ni Al(Cr)和少量的Al3Ni、Al Ni3和Al等,但La2O3+Ni60熔覆层中含稀土化合物Al4La,Y2O3+Ni60熔覆层中出现了YAl3、Al Ni Y和Ni17Y2,Ce O2+Ni60熔覆层中检测到了Ce Ni5和Ce3Ni6Si2;添加不同稀土氧化物的Ni60熔覆层呈现细密的、均匀分布的枝晶,无明显气孔,其晶粒较不含稀土的Ni60熔覆层明显细化;加入稀土氧化物的Ni60熔覆层硬度提高HV100~300,且随着深度的增加,硬度值比未加稀土的Ni60熔覆层过渡较平缓;和Ni60熔覆层相比,添加稀土氧化物La2O3、Y2O3和Ce O2的Ni60熔覆层磨损面崩损程度减小了,具有较平整的表面磨痕形貌,磨痕深度和宽度均大幅减小,磨损量减少了一个数量级,摩擦系数也较低,其中加入La2O3和Ce O2的熔覆层磨损量最低,耐磨性最好.
The cladding layer of Ni60 alloy with La2O3, Y2O3 and CeO2 added on the surface of 6063Al was prepared by laser cladding. The properties of rare earth oxides were studied by SEM, XRD, microhardness tester and friction and wear tester. On the microstructure, hardness and friction and wear properties of Ni-based laser cladding layer on 6063Al surface.The results show that the main phase structures of the cladding layers are β-Ni Al (Cr) and a small amount of Al3Ni, Al Ni3 and Al and so on. However, YAl3, Al Ni Y and Ni17Y2 appeared in the cladding layers of Al4La and Y2O3 + Ni60 containing La2O3 + Ni60 coatings. Ce Ni5 and Ce3Ni6Si2 were detected in the coatings of Ce O2 + Ni60. Ni60 cladding layer of rare earth oxides showed fine and uniform distribution of dendrites, no obvious pores, and the grain size of Ni60 cladding layer was obviously refined than that of rare earth-free Ni60 cladding layer. The hardness of Ni60 cladding layer with rare earth oxide was increased by HV100 ~ 300, and with the increase of the depth, the hardness value is more gentle than that of the Ni60 cladding layer without addition of rare earth. Compared with Ni60 cladding layer, the wear surface of Ni60 cladding layer with addition of rare earth oxides La2O3, Y2O3 and Ce O2 Decrease the extent of damage, with a relatively flat surface wear scar shape, grinding The depth and width are greatly reduced, the amount of wear is reduced an order of magnitude, the friction coefficient is low, the lowest added amount of wear of the cladding layer of La2O3 and Ce O2, the best wear resistance.