Yehia Hossam M, El-Tantawy Ahmed, Elkady Omayma A, Ghayad Ibrahim M, Daoush Walid M
Faculty of Technology and Education, Department of Production Technology, Helwan University, Cairo, Egypt.
Central Metallurgical Research and Development Institute (CMRDI), Powder Technology Department, Helwan, Cairo, Egypt.
Front Bioeng Biotechnol. 2024 Jul 15;12:1412586. doi: 10.3389/fbioe.2024.1412586. eCollection 2024.
Titanium (Ti)-molybdenum(Mo) composites reinforced with ceramic nanoparticles have recently significant interest among researchers as a new type of bio-inert material used for dental prosthetic applications due to its biocompatibility, outstanding physical, mechanical and corrosion properties. The current work investigates the impact of alumina (AlO) nanoparticles on the properties of the Ti-12Mo composite, including microstructure, density, hardness, wear resistance, and electrochemical behavior. Ti-12Mo/xAlO nanocomposites reinforced with different AlO nanoparticles content were prepared. The composition of each sample was adjusted through the mechanical milling of the elemental constituents of the sample for 24 h under an argon atmosphere. The produced nanocomposite powders were then cold-pressed at 600 MPa and sintered at different temperatures (1,350°C, 1,450°C, and 1,500°C) for 90 min. Based on density measurements using the Archimedes method, the most suitable sintering temperature was found to be 1,450°C. The morphology and chemical composition of the milled and sintered composites were analyzed using back-scattering scanning electron microscopy (SEM) and X-ray diffraction (XRD). The results showed that the addition of Mo increased the Ti density from 99.11% to 99.46%, while the incorporation of 15wt% AlO in the Ti-12Mo composite decreased the density to 97.28%. Furthermore, the Vickers hardness and wear behavior of the Ti-Mo composite were enhanced with the addition of up to 5 wt% AlO. The sample contains 5 wt% AlO exhibited a Vickers hardness of 593.4 HV, compared to 320 HV for pure Ti, and demonstrated the lowest wear rate of 0.0367 mg/min, compared to 0.307 mg/min for pure Ti. Electrochemical investigations revealed that the sintered Ti-12Mo/xAlO nanocomposites displayed higher corrosion resistance against a simulated artificial saliva (AS) solution than pure Ti. The concentrations of Ti, Mo, and Al ions released from the Ti-12Mo/xAlO nanocomposites in the AS solution were within the safe levels. It was found from this study that; the sample of the composition Ti-12Mo/5wt%AlO exhibited appropriate mechanical properties, biocompatibility, corrosion resistance against the AS solution with acceptable ion concentration released in the biological fluids. Therefore, it can be considered as a new bio-inert material for potential applications in dental prosthetics.
由于具有生物相容性、出色的物理、机械和耐腐蚀性能，作为一种用于牙科修复应用的新型生物惰性材料，陶瓷纳米颗粒增强的钛（Ti）-钼（Mo）复合材料最近引起了研究人员的极大兴趣。当前的工作研究了氧化铝（Al₂O₃）纳米颗粒对Ti-12Mo复合材料性能的影响，包括微观结构、密度、硬度、耐磨性和电化学行为。制备了不同Al₂O₃纳米颗粒含量增强的Ti-12Mo/xAl₂O₃纳米复合材料。通过在氩气气氛下将样品的元素成分机械研磨24小时来调整每个样品的成分。然后将制备的纳米复合粉末在600MPa下冷压，并在不同温度（1350°C、1450°C和1500°C）下烧结90分钟。基于使用阿基米德法进行的密度测量，发现最合适的烧结温度为1450°C。使用背散射扫描电子显微镜（SEM）和X射线衍射（XRD）分析研磨和烧结复合材料的形态和化学成分。结果表明，添加Mo使Ti的密度从99.11%提高到99.46%，而在Ti-12Mo复合材料中加入15wt%的Al₂O₃使密度降至97.28%。此外，添加高达5wt%的Al₂O₃可提高Ti-Mo复合材料的维氏硬度和耐磨性能。含有5wt%Al₂O₃的样品维氏硬度为593.4HV，而纯Ti为320HV，并且磨损率最低，为0.0367mg/min，而纯Ti为0.307mg/min。电化学研究表明，烧结的Ti-12Mo/xAl₂O₃纳米复合材料对模拟人工唾液（AS）溶液的耐腐蚀性高于纯Ti。Ti-12Mo/xAl₂O₃纳米复合材料在AS溶液中释放的Ti、Mo和Al离子浓度在安全范围内。从这项研究中发现；Ti-12Mo/5wt%Al₂O₃组成的样品表现出合适的机械性能、生物相容性、对AS溶液的耐腐蚀性，并且在生物流体中释放的离子浓度可接受。因此，它可以被认为是一种用于牙科修复潜在应用的新型生物惰性材料。
