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首页> 外文期刊>Journal of biomedical materials research. Part B, Applied biomaterials. >Effects of cyclic bending and physiological solution on plasma-sprayed hydroxylapatite coatings of varying crystallinity.
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Effects of cyclic bending and physiological solution on plasma-sprayed hydroxylapatite coatings of varying crystallinity.

机译：循环弯曲和生理溶液对不同结晶度的等离子喷涂羟基磷灰石涂层的影响。

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摘要

This study investigated the effects of cyclic bending stress levels and testing in simulated physiological solutions or air on the integrity of plasma-sprayed hydroxylapatite (HA) coatings of two different crystallinities. Hydroxylapatite-coated commercially pure (CP) Ti rods were evaluated by immersion testing in Hank's Balanced Salt Solution (HBSS) and by rotating bending in air and HBSS. Static immersion testing of nonstressed specimens resulted in significant microcracking of coating surfaces after 42 days. Specimens cyclically tested at bending stresses above the yield strength of Ti experienced low cycle fatigue failure of the Ti substrates prior to spallation of the HA coatings. Coatings tested at 1 x 10(6) cycles with interface bending stresses of 180 MPa displayed increased surface microcracking, but no bulk coating spallation. Coatings cycled in HBSS displayed greater amounts of microcracking and surface alteration than samples cycled in air. There was no apparent relation between HA crystallinity and mechanical integrity under cyclic bending stresses. Copyright 1999 John Wiley & Sons, Inc.
机译：这项研究调查了周期性弯曲应力水平的影响，并在模拟生理溶液或空气中进行测试，对两种不同结晶度的等离子喷涂羟基磷灰石（HA）涂层的完整性进行了测试。通过在Hank的平衡盐溶液（HBSS）中进行浸入测试以及在空气和HBSS中旋转弯曲，评估了涂覆羟基磷灰石的商业纯（CP）Ti棒。在42天后，无应力试样的静态浸没测试导致涂层表面发生明显的微裂纹。在高于Ti的屈服强度的弯曲应力下进行循环测试的样品在HA涂层剥落之前经历了Ti基材的低循环疲劳破坏。在1 x 10（6）循环下测试的涂层，界面弯曲应力为180 MPa，显示出表面微裂纹增加，但没有整体涂层剥落。与在空气中循环的样品相比，在HBSS中循环的涂层显示出更多的微裂纹和表面变化。在周期性弯曲应力下，HA结晶度和机械完整性之间没有明显的关系。版权所有1999 John Wiley＆Sons，Inc.

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