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利用波长为 1.0 6 μm ,功率密度为 10 - 2 0kW cm2 的Nd :YAG激光器的聚焦光束为热源 ,在易氧化的纯铝表面制备了锌铝熔覆层 ,对熔覆工艺、熔覆层的微观组织、激光参数进行了实验研究。实验结果表明 ,强激光光辐照使基体材料铝表面熔覆高硬度、抗氧化的锌金属表面层是可行的。通过金相显微镜微观组织结构的分析 ,研究了激光工艺参数对Zn Al熔覆层过渡区裂纹倾向的影响 ,只要选择合适的激光束参数 ,可获得理想的Zn Al合金熔覆层。这对改进铝材表面物理、化学性能并进一步开发铝的用途具有实用价值。
Using the focused beam of a Nd: YAG laser with a wavelength of 1.06 μm and a power density of 10 - 20 kW cm2 as the heat source, a zinc - aluminum cladding layer was prepared on the surface of easily oxidized pure aluminum. The effects of the cladding process, Microstructure and laser parameters were studied experimentally. The experimental results show that strong laser light irradiation can make the aluminum material of the base material have high hardness and the oxidation resistant zinc metal surface layer is feasible. The influence of laser process parameters on the crack tendency in the transition zone of ZnAl cladding layer was studied by analyzing the microstructure of the optical microscope. The ideal ZnAl alloy cladding layer could be obtained by selecting appropriate laser beam parameters. This has practical value in improving the surface physical and chemical properties of aluminum and further developing the use of aluminum.