【摘要】 利用双层辉光等离子渗金属技术,在钛合金表面渗钽形成扩散层。测量了渗层的显微硬度及钽元素在渗层中的分布,用XRD观察分析了渗层的相结构。并采用WTM-1型球-盘磨损实验机对渗层的摩擦磨损性能进行了研究,采用CS300P型电化学腐蚀工作站在0.5mol/L的稀硫酸溶液中对渗层的耐蚀性能进行了研究。结果表明:在Ti6Al4V合金基体表面形成10μm厚的渗层,表面显微硬度值达到530HV(载荷为0.49N),渗层主要由正方晶-βTa组成。渗层摩擦学性能得以提高,摩擦系数从原来的0.35降为0.20。钛合金渗钽后表面腐蚀速率明显减慢,耐蚀性能进一步提高。更多还原

【Abstract】 The tantalizing diffusion coating was fabricated on surface of titanium alloy(Ti6Al4V) by double glow discharge plasma tantalizing process.The pure titanium was selected as the source cathode and Ar as the working gas.The microhardness of the surface of coating was tested by HMV-1T micro-hardness tester.The microstructure and the phase structure of the tantalized coating were analyzed by means of scanning electron microscopy(SEM) and X-ray diffraction(XRD).The distribution curve of Ta,Ti elements in the coating was measured by energy dispersive spectroscopy(EDS).The friction and wear behavior of the diffusion coating under dry sliding against SAE52100 steel was evaluated on a WTM-1 ball-on-disc tester.The corrosion resistance of the coating was tested using CS300P electrochemical corrosion workshop in 0.5mol/L sulphuric acid solution.The results show that it is feasible to prepare a tantalized coating of 10μm thick by this process at 800～900℃ for 4h.The microhardness of the coating is as high as 530HV,which is higher than that of the Ti6Al4V base.The phases are mainly βTa in the coating.It is found that the tantalized coating exhibits good wear-resistant behavior and excellent corrosion resistance.The corrosion velocity is obviously decreased for the titanium alloy after tantalizing treatment.更多还原