Hydroxyapatite nanoparticles coating on Ti-6Al-4V substrate using plasma spray method

Transactions of the IMF Pub Date : 2022-09-14 DOI:10.1080/00202967.2022.2107771

P. Bagheri, S. Saber-Samandari, A. Sadeghi, S. Akhtarian, A. Doostmohammadi

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引用次数: 1

Abstract

ABSTRACT In this research, hydroxyapatite powder particles were coated on a Ti-6Al-4V alloy substrate by the plasma spraying method to create bone implants by benefitting from titanium's mechanical properties and hydroxyapatite's biological properties. Hydroxyapatite prepared by the plasma spraying method suffers from decomposition, formation of other calcium phosphate phases, weak adhesion to the substrate, and microcrack formation in the coating due to residual stresses initiated by the high temperature of the coating process. To improve the hydroxyapatite coating properties, the Ti-6Al-4V alloy was preheated, and then hydroxyapatite coating took place. The results showed that residual stress in the interface decreased, and adhesion improved by preheating the substrate. However, formation of an amorphous phase on coating was observed, resulting in a higher dissolution rate in the biological environment and weak mechanical properties compared to crystalline hydroxyapatite. Experimental results showed that heat treatment after the coating process decreased the amount of this amorphous phase and heightened the crystallinity of the coating by up to more than 60%.

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等离子喷涂法在Ti-6Al-4V基板上涂覆羟基磷灰石纳米颗粒

本研究利用钛的力学性能和羟基磷灰石的生物学特性，采用等离子喷涂方法将羟基磷灰石粉末颗粒涂覆在Ti-6Al-4V合金基体上，制备骨种植体。等离子喷涂法制备的羟基磷灰石容易分解，形成其他磷酸钙相，与基体的附着力较弱，涂层高温产生的残余应力导致涂层中形成微裂纹。为改善羟基磷灰石涂层性能，对Ti-6Al-4V合金进行预热，然后进行羟基磷灰石涂层。结果表明，对基体进行预热后，界面残余应力减小，附着力提高。然而，涂层上形成了非晶相，与结晶羟基磷灰石相比，在生物环境中溶解速率更高，力学性能较弱。实验结果表明，涂层后的热处理减少了非晶相的数量，使涂层的结晶度提高了60%以上。

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