Laboratoire de Mécanique, Matériaux et Procédés LR99ES05, Ecole Nationale Supérieure d'Ingénieurs de Tunis, 5 Avenue Taha Hussein, Montfleury, 1008, Université de Tunis, Tunisia; Institut de Thermique, Mécanique et Matériaux (ITheMM), Université de Reims Champagne-Ardenne (URCA), 51100, Reims, France.
Laboratoire de Mécanique, Matériaux et Procédés LR99ES05, Ecole Nationale Supérieure d'Ingénieurs de Tunis, 5 Avenue Taha Hussein, Montfleury, 1008, Université de Tunis, Tunisia.
J Mech Behav Biomed Mater. 2022 Oct;134:105352. doi: 10.1016/j.jmbbm.2022.105352. Epub 2022 Jul 1.
The purpose of this work is the synthesis and the characterization of sol-gel derived 45S5 bioactive glass coatings deposited onto Ti6Al4V alloy substrates. This coating aims the improvement of the biocompatibility of metallic implants for use in dentistry and orthopedy. The 45S5 bioactive glass powder was synthetized by the sol-gel process and the coatings were produced by the electrophoretic deposition technique (EPD). A grinding protocol was developed to reduce the particle size distribution of the sol-gel powder in order to obtain a stable suspension needed for the electrophoretic deposition. The particle size distribution of the sol-gel powder was determined using Dynamic Light Scattering (DLS). Different characterization techniques including X-ray diffraction (XRD), Scanning electron microscopy (SEM) associated to X-ray microanalysis (EDXS), were used to investigate the microstructure and the morphology of the coatings before and after an optimized thermal treatment. Homogeneous 45S5 bioactive glass coatings were obtained with no observable defects. However these coatings are functional if they present good mechanical properties. Thus, a mechanical study using nano-indentation and micro-scratch testing was carried out. The obtained results showed that well adherent and cohesive coatings were obtained. The Young's modulus and the hardness are improved with the thermal treatment. Indeed, they increased from 11 ± 0.54 GPa and 100 ± 4.34 MPa respectively to 28 ± 1.34 GPa and 300 ± 14.21 MPa. The corrosion resistance of the coatings was also studied. The electrochemical were carried using a Potentiostat-Galvanostat PGZ301 in 3.5% NaCl solution at 37 °C. It was observed that the 45S5 sol-gel derived bioactive glass coatings allowed the enhancement of corrosion resistance of the implant.
这项工作的目的是合成和表征溶胶-凝胶衍生的 45S5 生物活性玻璃涂层，该涂层沉积在 Ti6Al4V 合金基底上。这种涂层旨在提高金属植入物在牙科和矫形领域的生物相容性。45S5 生物活性玻璃粉末通过溶胶-凝胶法合成，涂层通过电泳沉积技术（EPD）制备。开发了一种研磨方案来减小溶胶-凝胶粉末的粒度分布，以获得用于电泳沉积的稳定悬浮液。溶胶-凝胶粉末的粒度分布通过动态光散射（DLS）确定。使用 X 射线衍射（XRD）、扫描电子显微镜（SEM）结合 X 射线微分析（EDXS）等不同的表征技术，研究了优化热处理前后涂层的微观结构和形貌。获得了均匀的 45S5 生物活性玻璃涂层，没有观察到明显的缺陷。然而，如果这些涂层具有良好的机械性能，它们就是有效的。因此，进行了纳米压痕和微划痕测试的机械研究。结果表明，获得了良好附着和内聚的涂层。热处理后，杨氏模量和硬度提高。事实上，它们分别从 11±0.54 GPa 和 100±4.34 MPa 增加到 28±1.34 GPa 和 300±14.21 MPa。还研究了涂层的耐腐蚀性。使用 PGZ301 电位-电流计在 37°C 的 3.5%NaCl 溶液中进行电化学测试。观察到 45S5 溶胶-凝胶衍生的生物活性玻璃涂层提高了植入物的耐腐蚀性。
