【作者】 陈飞； 陈家庆； 周海； 吕反修；

【Author】 CHEN Fei~(1,2) CHEN Jia-qing~1 ZHOU Hai~1 LVFan-xiu~2 (1.College of Mechanical Engineering,Beijing Institute of Petrochemical Technology,Beijing 102617,China; 2.School of Materials Science and Engineering,University of Science and Technology,Beijing 100083,China)

【机构】 北京石油化工学院机械工程学院； 北京科技大学材料科学与工程学院；

【摘要】 利用双层辉光离子渗金属技术,以纯铝作为源极,氩气为工作气体,利用不等电位空心阴极效应,在钛合金（Ti6Al4V）表面渗铝,形成均匀致密的钛铝合金扩散层,以期提高钛合金的表面性能。用显微硬度仪测量渗层的显微硬度,并用SEM、XRD观察分析了钛铝合金渗层的截面形貌和相结构。采用WTM-1型球-盘磨损实验机对钛合金表面渗层的摩擦学性能进行了研究,采用CS300P型电化学腐蚀工作站在0.5mol/L的稀硫酸溶液中对钛合金表面钛铝合金层的耐蚀性能进行了研究。结果表明:在950℃保温时间5h的工艺条件下Ti6Al4V合金基材表面形成20μm厚的钛铝合金扩散层。表面显微硬度值达到810HV。钛铝合金扩散层主要由金属间化合物Ti₃Al和TiAl组成。钛铝合金扩散层显著提高了钛合金表面摩擦学性能,摩擦系数从原来的0.35左右降为0.15,抗磨损性能也大幅提高。同时钛铝扩散层大大提高了钛合金表面的耐蚀性能,腐蚀速率明显减慢。更多还原

【Abstract】 The Ti-Al alloying diffusion layer was fabricated on the surface of titanium alloy（Ti6Al4V） by double glow discharge plasma technique and hollow cathode effect.The pure aluminum was selected as the source cathode and Ar as the working gas.The microhardness of the surface of sample was tested by HMV-1T micro-sclerometer.The cross sectional microstructure and the phase structure of the Ti-Al alloying layer were analyzed by means of the scanning electron microscopy（SEM） and X-ray diffraction（XRD）.The friction and wear behavior of the Ti-Al alloying layer under dry sliding against SAE52100 steel was evaluated on a WTM- 1 ball-on-disc test rig.The corrosion resistance of the Ti-Al alloying layer was tested using CS300P electrochemical corrosion workshop in the 0.5mol/L sulphuric acid solution.The results showed that it was feasible to prepare a Ti-Al alloying layer of 20μm thick by this process at 950℃for 5h.The phases are mainly Ti₃Al and TiAl in the Ti-Al alloying layer.It has been found that the Ti-Al alloying layer has excellent friction and wear-resistant behaviors.The Ti6Al4V alloy was characterized by adhesion wear and scuffing under dry sliding against the steel,while the Ti-Al alloying layer experienced much abated adhesion wear and scuffing under the same testing condition.The Ti-Al alloying layer has excellent corrosion resistance properties too. The corrosion velocity was obviously slowed down remarkably.更多还原