Effect of titanium dioxide intermediate layer on scratch and corrosion resistance of sol-gel-derived HA coating applied on Ti-6Al-4V substrate.

IF 4.4 3区医学 Q2 ENGINEERING, BIOMEDICAL Progress in Biomaterials Pub Date : 2021-12-01 Epub Date: 2021-11-06 DOI:10.1007/s40204-021-00169-0

Rezvan Azari, Hamid Reza Rezaie, Alireza Khavandi

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引用次数: 8

Abstract

Modification of dental and orthopedic implants' surface by coating them with bioactive materials, such as hydroxyapatite (HA), diminishes the implants' fixation time. Appropriate adhesion to the substrate and stability in biological conditions are essential requirements for these coatings. In this study, sol-gel-derived HA coating was applied on the Ti-6Al-4 V substrate, which is a high-performance alloy for manufacturing bone implants. Also, titanium dioxide (TiO₂) which was prepared by the sol-gel method was used as an intermediate layer between HA coating and the substrate. The nano-scratch and potentiodynamic polarization tests were employed to evaluate the effectiveness of TiO₂ intermediate layer on improving the scratch resistance, as an indicator of coating adhesion strength, and the corrosion resistance of the coated samples. The quality of the coating bonded to the substrate was studied by cross-sectional SEM images. The XRD tests indicated that HA and TiO₂ coatings were formed with predetermined phase compositions. The biocompatibility of sol-gel-derived HA coating was established by simulated body fluid (SBF) immersion tests. The SEM images, along with the results of electrochemical and nano-scratch tests, proved the significant effect of a TiO₂ intermediate layer on improving the scratch resistance and stability of HA coating on titanium alloy substrate.

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二氧化钛中间层对Ti-6Al-4V基板溶胶-凝胶型HA涂层划伤及耐蚀性能的影响

通过涂覆生物活性材料(如羟基磷灰石(HA))来修饰牙科和骨科种植体的表面，可以缩短种植体的固定时间。适当的附着力和生物条件下的稳定性是这些涂层的基本要求。在这项研究中，溶胶-凝胶衍生的HA涂层被应用于ti - 6al - 4v衬底上，ti - 6al - 4v是一种用于制造骨植入物的高性能合金。采用溶胶-凝胶法制备的二氧化钛(TiO2)作为HA涂层与基体之间的中间层。通过纳米划伤和动电位极化试验，评价TiO2中间层对涂层抗划伤性能的改善效果，并以此作为涂层附着强度的指标，以及涂层样品的耐腐蚀性能。利用扫描电镜(SEM)的横截面图像研究了涂层与基体结合的质量。XRD测试表明，羟基磷灰石和二氧化钛涂层具有预定的相组成。通过模拟体液(SBF)浸泡试验，确定了溶胶-凝胶型透明质酸涂层的生物相容性。SEM图像以及电化学和纳米划伤测试结果证明，TiO2中间层对提高钛合金基体上HA涂层的抗划伤性和稳定性有显著作用。

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来源期刊

Progress in Biomaterials MATERIALS SCIENCE, BIOMATERIALS-

CiteScore

9.60

自引率

4.10%

发文量

期刊介绍： Progress in Biomaterials is a multidisciplinary, English-language publication of original contributions and reviews concerning studies of the preparation, performance and evaluation of biomaterials; the chemical, physical, biological and mechanical behavior of materials both in vitro and in vivo in areas such as tissue engineering and regenerative medicine, drug delivery and implants where biomaterials play a significant role. Including all areas of: design; preparation; performance and evaluation of nano- and biomaterials in tissue engineering; drug delivery systems; regenerative medicine; implantable medical devices; interaction of cells/stem cells on biomaterials and related applications.