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(Ti6A l4V)表面渗铝,形成均匀致密的钛铝合金扩散层,采用WTM-1型球-盘摩擦磨损试验机对钛合金表面钛铝合金扩散层的摩擦性能进行研究,用显微硬度仪测量渗层的显微硬度,并用扫描电子显微镜和X射线衍射仪观察分析钛铝合金扩散层的截面形貌和相结构.结果表明:在Ti6Al4V合金基材表面形成厚20μm的钛铝合金扩散层,其表面显微硬度达810HV;钛铝合金扩散层主要由金属间化合物Ti3A l和TiAl组成;钛铝合金扩散层可以显著提高钛合金表面的摩擦性能,摩擦系数从0.35左右降至0.15,抗磨损性能大幅提高.
Ti-AI 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 source cathode and Ar as working gas. The friction and wear behavior of the Ti-Al alloying was evaluated using a WTM-1 ball-on-disc tri- bometer sliding against SAE52100 steel in air. The microhardness of the surface of sample was measured with HMV-1T hardness tester. The cross sectional microstructure and phase structure of the Ti-Al alloying layer were examined using a scanning electron microscopy （SEM） and X-ray diffraction （XRD）. Ti-Al alloying layer with thickness of 20 μm was prepared with the technique used process at 950 ℃ for 5 h. The microhardness of the Ti-Al alloying layer was 810HV, which was much higher than that of the Ti6Al4V substrate. Ti3Al and TiAl were the major phases in the Ti-Al alloying layer. The coefficient of friction of the Ti-Al alloying layer was lower （0.15） than of Ti6Al4V alloy （0.35）. The Ti-Al alloying layer exhibited better adhesion wear and scuffing wear resistance in comparison with Ti6Al4V alloy.
出处
《摩擦学学报》
EI
CAS
CSCD
北大核心
2007年第3期210-213,共4页
Tribology
基金
北京市优秀人才培养资助项目(20061D0500500151)
关键词
钛合金
双层辉光
钛铝合金扩散层
摩擦磨损性能
Titanium, double glow discharge, Ti-A1 alloying layer, friction and wear behavior
