激光熔覆Fe基／纳米Al2O3复合涂层的硬度及耐磨性
Hardness and Wear Properties of Fe-based / Nano-Al2O3 Composite Coating Prepared by Laser Cladding
张大伟, 胡 强, 胡跃瑞, 邱忠赛
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作者单位：(温州大学 机电工程学院, 浙江 温州 325035)
中文关键字：铁基合金； 纳米α-Al2O3； 激光熔覆； 显微硬度； 摩擦磨损
英文关键字：Fe-based alloy; nano α-Al2O3; laser cladding; microhardness; friction and wear
中文摘要：对1Cr18Ni9Ti不锈钢进行了激光表面熔覆，所用涂层材料为添加不同含量的α-Al2O3纳米粉构成的Fe基合金。组织观察和涂层硬度及干滑动摩擦磨损试验表明，三种纳米粉含量(1%，2%和3%质量分数)涂层都不同程度地改善了Fe基合金熔覆层的硬度及耐磨性能，其中2%纳米颗粒含量涂层有较高的涂层硬度和较小的质量损失。硬度平均提高了约100 HV，质量损失平均下降约30%。耐磨性的改善被认为是与细小的α-Al2O3纳米粒子产生的细晶强化和第二相强化作用有关。
英文摘要：Laser cladding on 1Cr18Ni9Ti steel surface was carried out using Fe-based alloy powder mixed with nano-Al2O3 particles in different proportions. The structure analysis and the hardness and dry slide wear test of the laser coatings show that three kinds of coatings with nano-Al2O3 1wt%, 2wt% and 3wt%, respectively all improve the hardness and wear resistance of Fe-based alloy layers in various degrees, a higher hardness and a litter mass loss of the coating with 2wt% nano-Al2O3 are obtained. The average hardness value is increased by 100 HV and the mass loss is decreased about 30%. The improvement of wear resistance has to do with fine grain strengthen and second phase strengthen induced by the fine nano-Al2O3 particles.