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首页> 外文会议>2001 TMS Annual Meeting on Structural Biomaterials for the 21st Century, Feb 11-12, 2001, New Orleans, LA >MECHANICAL INTEGRITY OF HYDROXYAPATITE COATINGS ON TITANIUM IMPLANTS
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MECHANICAL INTEGRITY OF HYDROXYAPATITE COATINGS ON TITANIUM IMPLANTS

机译：钛嵌体上羟基磷灰石涂层的机械完整性

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Hydroxyapatite (HA) coated Ti alloy is a promising material for biomedical implants. The successful applications of such implants rely on fundamental understandings of mechanical behavior of the HA coatings, particularly, the fatigue resistance. In this work the mechanical stability of HA coatings under cyclic loading was systematically investigated using four-point bending tests and the indentation tests in both air and simulated body fluid (SBF). Also, a shear cyclic test was developed for the coatings, considering the coatings of implants often failure under shearing loading in human body. Experiments revealed the conventional cyclic bending tests could not effectively evaluate the fatigue resistance of the HA coatings on Ti substrates. The contact fatigue under indentation might represent the worst service conditions of coatings. The cyclic indentation revealed that the fatigue damages in the HA coatings were severer in SBF than in air, and thin HA coatings exhibited less fatigue damages than the thick ones. The newly developed shear test for the coatings successfully generated similar shear loading as the conventional ones, however it is easier for alignment and for adapting coating thickness variation. Using the new method, the coating resistance to cyclic shear loading was evaluated with S-N curves. Also the tests revealed the existence of threshold stress which was required to generate fatigue damages in the coating.
机译：羟基磷灰石（HA）涂层的钛合金是用于生物医学植入物的有前途的材料。这种植入物的成功应用取决于对HA涂层机械性能的基本了解，尤其是抗疲劳性。在这项工作中，使用四点弯曲试验和空气和模拟体液（SBF）的压痕试验，系统地研究了HA涂层在循环载荷下的机械稳定性。此外，考虑到植入物的涂层在人体的剪切载荷下经常失效，因此对涂层进行了剪切循环试验。实验表明，常规的循环弯曲试验不能有效地评估Ti基体上HA涂层的耐疲劳性。压痕下的接触疲劳可能表示涂层的最坏使用条件。循环压痕表明，SBF中的HA涂层的疲劳损伤比空气中的严重，薄的HA涂层的疲劳损伤要比厚的涂层小。新开发的涂层剪切试验成功地产生了与常规剪切载荷相似的剪切载荷，但是更易于对准和适应涂层厚度变化。使用新方法，通过S-N曲线评估了涂层对循环剪切载荷的抵抗力。测试还表明存在阈值应力，该阈值是在涂层中产生疲劳损伤所必需的。

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