Abstract

Synthesis of tantalum oxide (Ta₂O₅) powders via sol–gel method and Ta₂O₅ coating ability onto AZ91 Mg alloy were investigated, in this study. AZ91 Mg alloy was chosen as substrate because of its low density and similar mechanical properties to bone. However, some surface treatments are needed, because the Mg alloy cannot maintain its mechanical integrity in the biological environment for long periods of time. Ta₂O₅ is a promising coating layer for biomedical applications, because of its excellent corrosion and wear resistance and biocompatibility. In the case of Ta₂O₅ coatings applied on AZ91 Mg alloy, which is advantageous in many respects, it can be used in long-term applications within the body. The novel study aims for the characterization of Ta₂O₅-coated AZ91 Mg alloys. AZ91 Mg alloy samples were produced using a powder metallurgy method. The Ta₂O₅ solution was prepared by sol–gel method. The prepared solution was used for both powder producing and coating processes. For the powder producing process, the solution was aged, dried and sintered sequentially. Then, Ta₂O₅ powders were obtained. For the coating process, the solution was applied to the AZ91 Mg alloy samples’ surfaces using a dip coater. Coated samples were dried and sintered. The morphologies of the samples were investigated by using scanning electron microscope with energy-dispersive spectroscopy (SEM–EDS, Jeol JSM 6060 LV) and X-ray diffraction (XRD, Bruker D8 Advance). The dried Ta₂O₅ powders were analyzed using combined thermogravimetry–differential thermal analysis (TG–DTA, Hitachi STA 7300). The coating ability of the tantalum oxide layer on the AZ91 Mg alloy surface has been discussed. The results demonstrate that an optimum amount of deflocculating chemicals must be added to the coating in order to optimize the surface morphology.

Graphic Abstract

中文翻译：

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钽氧化物溶胶-凝胶涂层AZ91 Mg合金的表征

摘要

研究了通过溶胶-凝胶法合成氧化钽（Ta ₂ O ₅）粉末和在AZ91 Mg合金上涂覆Ta ₂ O _5的能力。选择AZ91镁合金作为基底，是因为其密度低且与骨骼具有相似的机械性能。但是，由于镁合金不能在生物环境中长期维持其机械完整性，因此需要进行一些表面处理。Ta ₂ O ₅具有出色的耐腐蚀和耐磨性以及生物相容性，因此是用于生物医学应用的有前途的涂层。在Ta ₂ O ₅的情况下在许多方面都具有优势的AZ91 Mg合金上涂覆的涂料，可用于体内的长期应用。这项新颖的研究旨在表征Ta ₂ O ₅涂层的AZ91 Mg合金的特性。AZ91 Mg合金样品使用粉末冶金法生产。Ta ₂ O ₅溶液是通过溶胶-凝胶法制备的。制备的溶液用于粉末生产和涂覆过程。对于粉末生产过程，将溶液进行时效，干燥和依次烧结。然后，Ta ₂ O ₅得到粉末。对于涂覆过程，使用浸涂机将溶液涂覆到AZ91 Mg合金样品的表面。将涂覆的样品干燥并烧结。样品的形貌通过使用带能谱仪的扫描电子显微镜（SEM-EDS，Jeol JSM 6060 LV）和X射线衍射（XRD，Bruker D8 Advance）进行了研究。使用热重分析-差热分析（​​TG-DTA，日立STA 7300）分析了干燥的Ta ₂ O ₅粉末。讨论了在AZ91 Mg合金表面上钽氧化物的涂层能力。结果表明，必须向涂层中添加最适量的抗絮凝剂，以优化表面​​形态。

图形摘要