Functionally graded Co-Cr-Mo coating on Ti-6Al-4V alloy structures

被引：154
作者：
Krishna, B. Vamsi [1 ]
Xue, Weichang [1 ]
Bose, Susmita [1 ]
Bandyopadhyay, Amit [1 ]
机构：
[1] Washington State Univ, Sch Mech & Mat Engn, WM Keck Biomed Mat Res Lab, Pullman, WA 99164 USA
来源：
ACTA BIOMATERIALIA | 2008年 / 4卷 / 03期
关键词：
functionally graded materials; laser processing; laser engineered net shaping (LENS); biocompatibility; osteoblast;
D O I：
10.1016/j.actbio.2007.10.005
中图分类号：
R318 [生物医学工程];
学科分类号：
0831 ;
摘要：
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.
引用
收藏
页码：697 / 706
页数：10
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