采用Ag和Ta离子双注入对医用Ti6Al4V合金进行表面改性, 即以Ag离子1.0×1017 cm-2 先注入、以Ta离子1.5×1017 cm-2 后注入合金样品表面. 采用纳米力学探针研究离子注入前、后Ti6Al4V样品表面硬度随压入深度的变化, 利用多功能摩擦磨损试验机分析离子注入前、后样品的耐磨性, 利用XRD和XPS研究样品表面的物相组成和元素化合态. 结果表明, 离子注入后样品磨损量降低了77%. 耐磨损性能的明显改善归因于样品硬度增加, 磨损开始阶段保持低摩擦系数的时间较长和离子注入后合金固溶强化.
The wear performance of Ti6Al4V alloy for clinical usage was modified by dual--ion implantation technique. The samples were implanted firstly with silver ions at a dose of 1.0×1017 cm-2, then with tantalum ions at a dose of 1.5×1017 cm-2. Nanoindenter instrument was used to measure the variation of hardness with displacement into surface of sample, and multi--functional tribological tester was used to investigate the wear and tribological property. Phase constitution in the surface layer of Ti6Al4V alloy was characterized by glancing angle X--ray diffraction (GAXRD), the X--ray photoelectron spectroscopy was used to analyze the chemical states of elements in the surface layer of sample. The results show that the worn area of Ag+Ta dual--ion--implanted Ti6Al4V alloy is decreased by 77\% compared with untreated alloy. The improvement of the wear property is related to the increase of hardness, long holding time of low friction coefficient and solid solution strengthening induced by Ag and Ta.
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