Improvement of tribological properties of Ti6Al4V by nitrogen plasma immersion ion implantation
Improvement of tribological properties of Ti6Al4V by nitrogen plasma immersion ion implantation
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DOI：
10.1016/s0257-8972(03)00137-3
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发表时间：
2003-06
影响因子：
5.4
通讯作者：
M. Ueda;M. Silva;C. Otani;H. Reuther;M. Yatsuzuka;C. M. Lepienski;L. A. Berni
中科院分区：
文献类型：
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作者：
M. Ueda;M. Silva;C. Otani;H. Reuther;M. Yatsuzuka;C. M. Lepienski;L. A. Berni
采用等离子体浸泡氮注入Ti6Al4V （TAV）合金，改善人工心脏瓣膜试样的表面摩擦学性能。结果表明，在处理60 min后，氮峰浓度达到40%，植入层厚度仅为50 nm左右。较长时间的治疗没有显示保留剂量的改善，可能是由于溅射效应。然而，即使是如此浅的植入，也可以看到摩擦系数的显著降低和硬度的增加。此外，硬度的提高延伸到比注入层深得多的区域。这种氮注入钛合金的耐磨性有望得到改善，从而大大增加由TAV制成的部件的使用寿命，TAV在生物医学和航空航天应用中得到广泛应用。
Plasma immersion nitrogen implantation of Ti6Al4V (TAV) alloy was carried out to improve the surface tribological properties of test samples for artificial heart valves. Our results show that a good implantation with nitrogen peak concentration of 40% was achieved but with only approximately 50 nm implanted layer, after 60 min of treatment. Longer treatments showed no improvement in the retained dose, probably due to sputtering effects. However, both significant reduction of friction coefficient and increase in hardness was seen even for such a shallow implantation. Furthermore, the hardness improvement extended to regions much deeper than the implanted layer. Improvements of the wear resistance of such nitrogen implanted Ti alloy is expected, increasing considerably the useful lifetime of components made of TAV which is finding widespread use in biomedical and aerospace applications.