Functionally graded Co-Cr-Mo coating on Ti-6Al-4V alloy structures
Functionally graded Co-Cr-Mo coating on Ti-6Al-4V alloy structures
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DOI：
10.1016/j.actbio.2007.10.005
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发表时间：
2008-05-01
影响因子：
9.7
通讯作者：
Bandyopadhyay, Amit
中科院分区：
文献类型：
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作者：
Krishna, B. Vamsi;Xue, Weichang;Bandyopadhyay, Amit
使用激光工程净成形 (LENS (TM)) 技术，将功能分级、坚硬且耐磨的 Co-Cr-Mo 合金涂覆在 Ti-6Al-4V 合金上，并具有冶金学上良好的界面。在Ti-6Al-4V合金表面添加Co-Cr-Mo合金显着提高了表面硬度，且过渡区没有任何金属间相。由于裂纹，Ti-6Al-4V 的 100% Co-Cr-Mo 转变很难生产。然而，使用优化的 LENS (TM) 加工参数，在 Ti-6Al-4V 合金上沉积出含有高达 86% Co-Cr-Mo 的无裂纹涂层，具有出色的再现性。培养人成骨细胞以测试涂层的体外生物相容性。根据体外生物相容性，与基础 Ti-6Al-4V 合金相比，在涂层上培养 14 天后，增加涂层中的 Co-Cr-Mo 浓度会减少活细胞数量。然而，涂层样品始终表现出比 100% Co-Cr-Mo 合金更好的骨细胞增殖能力。使用 LENS (TM) 生产具有分级成分的近净形状组件可能是制造金属对金属假体装置的组合结构的可行途径，以最大限度地减少磨损引起的骨溶解和无菌性松动，这些是当前植入物设计中的重大问题。 (c) 2007 Acta Materialia Inc. 由 Elsevier Ltd 出版。保留所有权利。
Functionally graded, hard and wear-resistant Co-Cr-Mo alloy was coated on Ti-6Al-4V alloy with a metallurgically sound interface using Laser Engineering Net Shaping (LENS (TM)). The addition of the Co-Cr-Mo alloy onto the surface of Ti-6Al-4V alloy significantly increased the surface hardness without any intermetallic phases in the transition region. A 100% Co-Cr-Mo transition from Ti-6Al-4V was difficult to produce due to cracking. However, using optimized LENS (TM) processing parameters, crack-free coatings containing up to 86% Co-Cr-Mo, were deposited on Ti-6Al-4V alloy with excellent reproducibility. Human osteoblast cells were cultured to test in vitro biocompatibility of the coatings. Based on in vitro biocompatibility, increasing the Co-Cr-Mo concentration in the coating reduced the live cell numbers after 14 days of culture on the coating compared with base Ti-6Al-4V alloy. However, coated samples always showed better bone cell proliferation than 100% Co-Cr-Mo alloy. Producing near net shape components with graded compositions using LENS (TM) could potentially be a viable route for manufacturing unitized structures for metal-on-metal prosthetic devices to minimize the wear-induced osteolysis and aseptic loosening that are significant problems in current implant design. (c) 2007 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.