表面技术2025，Vol.54Issue(19)：153-162,10.DOI:10.16490/j.cnki.issn.1001-3660.2025.19.013
(Y1‒xGdx)2O3对WC增强Ni基复合涂层组织结构及性能的影响
Effect of(Y1‒xGdx)2O3 on Microstructure and Performance of WC-reinforced Nickel-based Composite Coatings
摘要
Abstract
Laser cladding represents an advanced surface strengthening technology that has garnered significant attention in materials engineering due to its ability to enhance surface properties of metallic substrates.To further improve the formation quality,corrosion resistance,and wear resistance of WC-reinforced Ni-based composite coatings,which are widely used in harsh industrial environments,(Y1‒xGdx)2O3/WC/Ni60A composite coatings are systematically fabricated and investigated using the laser cladding technique.The influence of varying x values in(Y1‒xGdx)2O3 on the microstructure and properties of WC/Ni60A coatings are studied.Initially,2wt.%of(Y1‒xGdx)2O3(0.0≤x≤1.0)is applied atop a 25wt.%WC/Ni60A coating.Specimens measuring 40 mm×15 mm×10 mm,cut from H13 steel,serve as the substrates.The cladding is prepared using the preset powder method with an FL020 fiber laser.The laser cladding parameters include a laser power of 1 300 W,a spot diameter of 2 mm,a scanning speed of 6 mm/s,and an overlap rate of 40%to achieve optimal coating quality.The phase composition,microstructure,and elemental distribution of the coatings are systematically characterized and analyzed using X-ray diffraction(XRD),scanning electron microscopy(SEM),and energy-dispersive spectroscopy(EDS).Additionally,Vickers hardness testers(HV-1000),multi-functional friction and wear testers(UMT-3),morphology microscopes,and electrochemical workstations(CHI-760)are employed to evaluate the abrasion and corrosion resistance of the coatings.The composite coatings,containing binary rare earth oxides with different x values,aresuccessfully prepared via laser cladding.These coatings exhibit a dense microstructure and are metallurgically bonded to the substrate.XRD analysis reveals that the composite coating primarily consists of γ-Ni dendrites and γ-phase structure of(Fe,Ni)solid solution.Compounds such as Ni2Y and Gd2Fe17Si are detected following the addition of(Y1‒xGdx)2O3.SEM and EDS results indicate a coating thickness of approximately 1.5 mm,with the cladding layer being free of defects such as pores and cracks,displaying uniform organization and no elemental segregation.Hardness test results demonstrate that the average microhardness of the composite coating increases with the x value,reaching a maximum of 465.61HV at x=0.8,which is approximately 2.3 times that of the substrate.The maximum microhardness of the coating is 839.5HV,about 4.2 times that of the substrate.Friction and wear tests show that the composite coating achieves the lowest friction coefficient of about 0.45 at x=0.8,with its wear rate also reaching a minimum of approximately 2.09×10‒3 mm3/(N·m),representing a 58.78%improvement over coatings without binary rare earth oxides.Electrochemical test results indicate that the composite coating exhibits the best corrosion resistance at x=0.2,with a self-corrosion potential of ‒0.387 2 V and a self-corrosion current density of 2.192×10‒6 A/cm2.However,the corrosion resistance decreases with increasing x values.These findings collectively demonstrate that the addition of binary rare earth oxides can effectively improve both the wear resistance and corrosion resistance of WC/Ni60A coatings,with the specific effects being composition-dependent.The outstanding performance of these coatings,particularly at optimal rare earth oxide compositions,positions them as promising new surface protection materials for extreme marine environments where both mechanical wear and electrochemical corrosion present significant challenges to material durability.关键词
激光熔覆/WC/Ni60A涂层/(Y1‒xGdx)2O3双元稀土氧化物/组织结构/耐磨耐腐蚀性能Key words
laser cladding/WC/Ni60A coating/(Y1‒xGdx)2O3 binary rare earth oxides/microstructure/wear and corrosion resistance分类
矿业与冶金引用本文复制引用
尹自豪,马兴华,尹宇,马名浩,张树玲,郭峰..(Y1‒xGdx)2O3对WC增强Ni基复合涂层组织结构及性能的影响[J].表面技术,2025,54(19):153-162,10.基金项目
国家自然科学基金(52375189)National Natural Science Foundation of China(52375189) （52375189）
