稀土氧化物在激光熔覆镍基合金涂层中的作用与影响

Effect and Influence of Rare Earth Oxides on Laser Cladding Nickel-Based Alloy Coatings

激光熔覆是一种先进的表面改性技术,具有对基体材料热影响区作用小、组织细密和基体的变形程度小等特点,被广泛应用于再制造领域。稀土元素能够改善镍基合金涂层组织,使熔覆层晶粒细小,同时净化晶界。总结稀土氧化物在激光熔覆镍基合金涂层研究中的进展,概述稀土氧化物的种类和性质,结合稀土氧化物的作用机制研究其对镍基合金涂层的晶粒尺寸、稀释率、裂纹的影响,分析涂层硬度、耐磨性、耐蚀性、抗氧化性等性能,同时讨论其对涂层中硬质相的影响。最后对目前阶段稀土氧化物对激光熔覆镍基合金涂层研究中存在的问题和未来的发展方向进行了展望。

Laser cladding is an advanced surface modification technology,which has the characteristics of small effect on the heat affected zone of the matrix,fine microstructure and small deformation degree of the matrix,and it has been widely used in the field of remanufacturing.Rare earth elements can improve the microstructure of nickel-based alloy coating and make the coating grain fine and purify grain boundary.The research progress of rare earth oxides in laser cladding nickel-based alloy coatings is summarized in this paper.The types and properties of rare earth oxides were summarized,and the effects of rare earth oxides on the grain size,dilution rate and crack of nickel base alloy coating were studied by combining the mechanism of rare earth oxides.The hardness,wear resistance,corrosion resistance and oxidation resistance of the coating were analyzed,and the effects of rare earth oxides on hard phase of the coating were also discussed.Finally,the existing problems and future development direction of rare earth oxide coating on laser cladding nickel-based alloy are prospected.