JOINT REPLACEMENT COMPONENTS MADE OF HOT-FORGED AND SURFACE-TREATED TI-6AL-7NB ALLOY

被引:162
作者
SEMLITSCH, MF
WEBER, H
STREICHER, RM
SCHON, R
机构
关键词
JOINT PROSTHESES; TITANIUM; WEAR; TOXICITY;
D O I
10.1016/0142-9612(92)90018-J
中图分类号
R318 [生物医学工程];
学科分类号
0831 ;
摘要
We have developed a titanium-aluminium alloy with the inert alloying element niobium. The optimal composition was found to be Ti-6Al-7Nb (Protasul-100). This custom-made alloy designed for implants shows the same alpha/beta structure as Ti-6Al-4V and exhibits equally good mechanical properties. The corrosion resistance of Ti-6Al-7Nb in sodium chloride solution is equivalent to that of pure titanium and Ti-6Al-4V. This is due to a very dense and stable passive layer. Highly stressed anchorage stems of different hip prosthesis designs have been made from hot-forged Ti-6Al-7Nb. The polished surfaces of hip, knee and wrist joints made of Ti-6Al-7Nb and articulating against polyethylene are surface-treated by means of a very hard and 3-5 mum thick titanium nitride coating (Tribosul-TiN) or by oxygen diffusion hardening (Tribosul-ODH) to a depth of 30 mum.
引用
收藏
页码:781 / 788
页数:8
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