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首页> 外文期刊>Materials Science Research International >Electrochemical Evaluation of Damage Level to Weight Bearing Surface of Metal Head Joint Prosthesis
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Electrochemical Evaluation of Damage Level to Weight Bearing Surface of Metal Head Joint Prosthesis

机译：金属头关节假体对承重表面损伤程度的电化学评估

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摘要

Pin on disk friction tests were carried out for three types of metals, 316L S.Steel, C6-28Cr-6Mo, and Ti-6Al-4V alloys in PBS(-) to estimate the range of loads that can be applied to the bearing surface of a joint prosthesis, based on the degree of.damage to the passivation film. The results were as follows: (1) When two metals of the same type were rubbed against each other, the passivation film was almost completely destroyed immediately after the onset of friction, even when a very low normal load was applied. (2) In the metal to UHMWPE friction test, the passivation film was severely damaged immediately after the onset of friction. However, the passivation film recovered until the polarization potential reached a certain level, which was specific to each metal. (3) The allowable load on the bearing head was calculated, assuming that the degree of damage to the passivation film was 20% or 40%. When a metal acetabulum socket was used, damage to the passivation film on the head was severe, regardless of the type of metal used for both the acetabulum socket and the head. When a UHMWPE acetabulum socket was used, the allowable load ranged from 8.16x10~2N to 1.31x10~5N for 316L S.Steel, from 7.83x10~3N to 1.31x10~5N for Co-28Cr-6Mo alloy, and from 43N to 6.08x10~2N for Ti-6Al-4Valloy.
机译：对PBS（-）中的三种类型的金属（316L S.Steel，C6-28Cr-6Mo和Ti-6Al-4V合金）进行销钉摩擦测试，以估计可施加到轴承上的载荷范围根据对钝化膜的损坏程度，确定关节假体的表面。结果如下：（1）当两种相同类型的金属彼此摩擦时，即使施加了非常低的法向载荷，钝化膜在摩擦开始后也几乎被完全破坏。 （2）在金属与UHMWPE的摩擦试验中，钝化膜在摩擦开始后立即受到严重破坏。然而，钝化膜恢复到极化电位达到特定于每种金属的特定水平。 （3）假设钝化膜的损坏程度为20％或40％，计算轴承头的允许载荷。当使用金属髋臼托槽时，无论用于髋臼托槽和头部的金属类型如何，头部上的钝化膜都受到严重破坏。使用UHMWPE髋臼窝时，316L S.Steel的允许载荷范围为8.16x10〜2N至1.31x10〜5N，Co-28Cr-6Mo合金的允许载荷范围为7.83x10〜3N至1.31x10〜5N，并且载荷范围为43N至Ti-6Al-4Valloy为6.08x10〜2N。

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