Department of Engineering, Shahrood Branch, Islamic Azad University, Shahrood, Iran.
Department of Materials Science and Engineering, Shahrood University of Technology, Shahrood, Iran.
J Biomed Mater Res B Appl Biomater. 2021 Oct;109(10):1395-1406. doi: 10.1002/jbm.b.34799. Epub 2021 Jan 22.
In this article, the effects of the simultaneous addition of the 3 mol % yttria-stabilized zirconia (3YSZ) and carbon nanotubes (CNTs) reinforcements on different properties of the natural hydroxyapatite (HAP) coating were studied. The electrophoretic deposition (EPD) process was implemented to prepare thin coatings on the Ti6Al4V substrate. The coatings were then sintered at 1000 ° C under vacuum for 2 hr and the mechanical properties of them were studied by the nano-indentation method. The microsture and phase content of the coatings were investigated by the scanning electron microscope and X-ray diffraction methods, respectively. The electrochemical properties of the samples were studied by potentiodynamic polarization and electrochemical impedance spectroscopy. The biocompatibility of the coatings was evaluated by the MTT test under standard conditions. It was found that the proper voltage and duration for the deposition of the coatings were 20 V and 4 min, while the longer deposition time of up to 6 min. Was tolerable in the coatings containing 5 wt % of the CNTs. The hardness and Young's modulus of the coatings were improved significantly by the siumultaneous addition of 3YSZ and CNTs, but the effect of nanotubes was more prominent. It was also found that the composite coating had marginally lower biocompatibility, as compared to the natural HAP, which was probably due to their lower roughness. The corrosion resistance of the HAP was not affected by the presence of 3YSZ particles, while the addition of CNTs improved the corrosion resistance of the coatings.
本文研究了同时添加 3 摩尔%氧化钇稳定氧化锆（3YSZ）和碳纳米管（CNTs）增强剂对天然羟基磷灰石（HAP）涂层不同性能的影响。采用电泳沉积（EPD）工艺在 Ti6Al4V 基底上制备了薄膜涂层。然后将涂层在真空下于 1000°C 下烧结 2 小时，并通过纳米压痕法研究了它们的力学性能。通过扫描电子显微镜和 X 射线衍射法分别研究了涂层的微观结构和相含量。通过动电位极化和电化学阻抗谱研究了样品的电化学性能。在标准条件下通过 MTT 测试评估了涂层的生物相容性。结果发现，涂层沉积的适当电压和时间分别为 20V 和 4 分钟，而在含有 5wt%CNTs 的涂层中，长达 6 分钟的沉积时间也是可以容忍的。通过同时添加 3YSZ 和 CNTs，涂层的硬度和杨氏模量显著提高，但纳米管的效果更为显著。还发现，与天然 HAP 相比，复合涂层的生物相容性略低，这可能是由于其粗糙度较低。HAP 的耐腐蚀性不受 3YSZ 颗粒的影响，而 CNTs 的添加提高了涂层的耐腐蚀性。
