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采用双辉等离子表面冶金技术对Ti-6Al-4V合金进行等离子渗铌处理。研究了温度与保温时间对合金层元素含量和渗层厚度的影响,以确定最佳渗金属工艺参数。利用光学图像分析仪以及辉光放电能谱仪观察和测定合金层的金相组织、渗层厚度及成分。结果表明,在极间距和气压恒定的条件下,渗层厚度及成分与温度和保温时间有关。温度过高或保温时间过长均会在Ti-6Al-4V试样表面产生较厚的Nb沉积层。经优化工艺参数,选择850℃保温3 h渗铌,得到一定厚度且与基体为冶金结合的合金层。该合金层可以克服Ti-6Al-4V合金耐磨性差的缺点。
Plasma treatment of Ti-6Al-4V alloy by niobium was performed by double-hull plasma surface metallurgy. The effects of temperature and holding time on the content of the alloy layer and the thickness of the diffusion layer were studied to determine the optimum technological parameters of the infiltration metal. Using optical image analyzer and glow discharge spectrometer observation and determination of the alloy layer metallographic structure, layer thickness and composition. The results show that the thickness and composition of the infiltrated layer are related to the temperature and the holding time under the conditions of constant electrode spacing and pressure. Excessive temperature or holding time is too long will produce thick Ti-6Al-4V specimen Nb deposition layer. Optimized process parameters, choose 850 ℃ heat 3 h infiltration niobium, get a certain thickness and the substrate for the metallurgical combination of alloy layer. The alloy layer can overcome the shortcomings of poor wear resistance of the Ti-6Al-4V alloy.