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首页> 外文期刊>Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing >Damage characterization of unmodified and surface modified medical grade titanium alloys under fretting fatigue condition
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Damage characterization of unmodified and surface modified medical grade titanium alloys under fretting fatigue condition

机译：微动疲劳条件下未改性和表面改性的医用级钛合金的损伤特征

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摘要

Fretting is a form of adhesive wear normally occurring at the contact points gradually leading to premature of load bearing medical implants made of titanium alloys. The aim of this work is to characterize the fretting fatigue damage features of PVD TIN coated, plasma nitrided and thermally oxidized Ti-6Al-4V and Ti-6Al-7Nb contact pairs. Fretting damage is applied with calibrated proof ring and contact pad arrangement. The results are compared with fretting damage of uncoated alloys. The damage progression during fretting process is apparently explained with friction coefficient curves. Plasma nitrided pairs performed better in terms of fretting fatigue lives with low friction coefficient of friction. PVD TiN coated pairs have experienced early failures due to third body mode of contact interaction with irregular friction coefficient pattern. Thermally oxidized pairs have experienced early failures due to high case thickness as well as irregular development of modified layer.
机译：微动磨损是粘合剂磨损的一种形式，通常会在接触点逐渐发生，从而导致由钛合金制成的承重医疗植入物过早地出现。这项工作的目的是表征PVD TIN涂层，等离子氮化和热氧化的Ti-6Al-4V和Ti-6Al-7Nb触头对的微动疲劳损伤特征。微调损伤可通过校准的防护环和接触垫装置进行。将结果与未涂层合金的微动磨损进行比较。微动过程中的损伤进展显然可以通过摩擦系数曲线来解释。就摩擦疲劳寿命和低摩擦摩擦系数而言，等离子体氮化对的性能更好。由于具有不规则摩擦系数模式的第三体接触相互作用，PVD TiN涂层对已经经历了早期失效。由于高壳体厚度以及改性层的不规则发展，热氧化对已经经历了早期失效。

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