纯铜表面Ta-W合金层的抗高温氧化及摩擦行为  

High Temperature Oxidation Resistance and Wear Property of Ta-W Coating on Pure Copper

作　　者：吕绪明 江涛[1,2] 张云汉 苑建志 杨凯 党博 张平则 LYU Xuming;JIANG Tao;ZHANG Yunhan;YUAN Jianzhi;YANG Kai;DANG Bo;ZHANG Pingze(Research Institute of Physical and Chemical Engineering of Nuclear Industry,Tianjin 300180,China;Science and Technology on Particle Transport and Separation Key National Defense Laboratory,Tianjin 300180,China;School of Material Science and Technology,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China)

机构地区：[1]核工业理化工程研究院,天津300180 [2]粒子输运与富集技术国防科技重点实验室,天津300180 [3]南京航空航天大学材料科学与技术学院,南京210016

出　　处：《材料导报》2022年第23期100-104,共5页Materials Reports

基　　金：粒子输运与富集技术国防科技重点实验室开放课题研究基金(SYSJJ-22301)。

摘　　要：采用双辉等离子渗金属技术在纯铜表面通过添加过渡层金属钽制备Ta-W合金层,通过在400℃下恒温氧化试验对比分析铜基体与Ta-W合金层的氧化性能,利用纳米压入和摩擦磨损试验评价Ta-W合金层的硬度和高温耐磨性能。结果表明,Ta-W合金层以胞状结构为主,均匀致密,厚度约为13μm,各层间元素含量呈梯度分布,界面结合良好,表面为单一的α-W相。在400℃恒温氧化50 h后,纯铜基体的氧化增重为13.9 mg/cm^(2),Ta-W合金层的氧化增重为4.6 mg/cm^(2),仅为纯铜基体的33.1%。Ta-W合金氧化试验后形成的氧化膜由WO和WO组成,连续致密、无缺陷,完整地覆盖住基体,有效阻碍了氧原子渗入基体,显著改善了纯铜基体的抗氧化性能。与纯铜基体相比,Ta-W合金层的表面纳米硬度从1.07 GPa提高到11.99 GPa,硬度显著提升;Ta-W合金层的平均摩擦系数变化不大,但摩擦系数的波动幅度显著降低,比磨损率由基体的13.77×10mm^(3)/(N·m)降至Ta-W合金层的7.24×10mm^(3)/(N·m),耐磨性得到提高,纯铜基体的磨损机制主要是粘着磨损、氧化磨损和磨粒磨损的共同作用,而Ta-W合金层则表现出轻微的磨粒磨损。In this study,the Ta-W coating was prepared by adding a transition layer of tantalum on the surface of pure copper using double glow plasma surface alloying technology.The oxidation property of copper matrix and Ta-W coating was analyzed by isothermal oxidation test at 400℃.The nano-hardness and high temperature wear resistance of Ta-W coating were carried out by using nano-indentation tester and friction wear tester,respectively.The results show that the Ta-W coating exhibits the cellular,compact and homogeneous structure,with the thicknesses of about 13μm.The element content of each layer presents a gradient distribution,which leads to good interface bonding,and the main phase of the coating is singleα-W.After isothermal oxidation for 50 h at 400℃,the oxidation mass gain of pure copper was 13.9 mg/cm^(2),and that of Ta-W coating was 4.6 mg/cm^(2),about 33.1%of the matrix.The continuous,dense and non-defective oxide film of Ta-W coating is composed of WOand WO,and the film completely covers the matrix,which could effectively prevent the oxygen into the substrate and significantly improve the oxidation performance.As compared with pure copper substrate,the nano-hardness of the Ta-W coating was significantly increased,from 1.07 GPa to 11.99 GPa.The average friction coefficient of Ta-W coating had a little change,but the fluctuation range of friction coefficient decreased significantly.The specific wear rate decreased from 13.77×10mm^(3)/(N·m)to 7.24×10mm^(3)/(N·m),which corresponded to an improvement of wear resistance.The wear mechanism of the substrate is mainly the combination of adhesion wear,oxidation wear and abrasive wear,while the Ta-W coating shows slight abrasive wear.

关 键 词：双辉等离子渗金属 Ta-W合金层 微观结构 高温氧化 耐磨性能 

分 类 号：TG147[一般工业技术—材料科学与工程]