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首页> 外文期刊>Journal of biomedical materials research. Part B, Applied biomaterials. >Characterization of functionally graded hydroxyapatite/titanium composite coatings plasma-sprayed on Ti alloys.
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Characterization of functionally graded hydroxyapatite/titanium composite coatings plasma-sprayed on Ti alloys.

机译：钛合金上等离子喷涂的功能梯度羟基磷灰石/钛复合涂层的表征。

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摘要

Bioceramic coatings like hydroxyapatite (HA) have shown promising bioactive properties in load-bearing implant applications. The aim of this work is to deposit functionally graded HA/Ti layers consisting of an underlying Ti bond coat, the alternating layer, and an HA top-layer on Ti6Al4V substrates using plasma spray to improve the coating-substrate interface properties. The alternating layers were created by means of changing the feeding rate and input power of Ti and HA powders, which gradually decrease Ti content with increasing depth from the Ti bond-coat. The major consideration is to examine the stability of the graded coatings. Experimental results indicated that surface chemistry and morphology of the graded coatings were similar to those of monolithic HA coatings. The bond strength values of the as-sprayed graded coatings were much superior to those of monolithic HA coatings. The cyclic fatigue did have a statistically significant effect on bond strength of monolithic HA coatings, with a decrease of 23%. However, the graded coatings were able to survive 1 million cycles of loading in air without significantly reduced bond strength. The in vitro electrochemical measurement results also indicated that the graded coatings had a more beneficial and desired behavior than monolithic HA coatings after fatigue.
机译：诸如羟基磷灰石（HA）的生物陶瓷涂层在承重的植入物应用中显示出令人鼓舞的生物活性。这项工作的目的是使用等离子喷涂在Ti6Al4V基底上沉积功能分级的HA / Ti层，该层由下面的Ti键合涂层，交替层和HA顶层组成，以改善涂层与基底的界面性能。交替层是通过改变Ti和HA粉末的进料速度和输入功率而形成的，随着从Ti键合涂层开始的深度增加，Ti和HA粉末逐渐降低Ti含量。主要考虑因素是检查渐变涂层的稳定性。实验结果表明，梯度涂层的表面化学和形貌与整体式HA涂层的相似。喷涂后的梯度涂料的粘结强度值远远优于整体式HA涂料。循环疲劳确实对整体式HA涂层的粘结强度具有统计学显着影响，降低了23％。但是，这种梯度涂料能够承受100万次空气加载循环而不会显着降低粘结强度。体外电化学测量结果还表明，与疲劳后的整体式HA涂层相比，梯度涂层具有更有益和理想的性能。

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