Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, China.
University of Chinese Academy of Sciences, Beijing, 100049, China.
J Mater Sci Mater Med. 2018 Mar 19;29(4):37. doi: 10.1007/s10856-018-6043-7.
Microstructure, tribological property and corrosion resistance of orthopedic implant materials CoCrW-3 wt.% Cu fabricated by selective laser melting (SLM) process were systematically investigated with CoCrW as control. Equaxied γ-phase together with the inside {111} < 112 > type twin and platelet ε-phase was found in both the Cu-bearing and Cu-free alloys. Compared to the Cu-free alloy, the introduction of 3 wt.% Cu significantly increased the volume fraction of the ε-phase. In both alloys, the hardness of ε-phase zone was rather higher (~4 times) than that of γ-phase zone. The wear factor of 3 wt.% Cu-bearing alloy possessed smaller wear factor, although it had higher friction coefficient compared with Cu-free alloys. The ε-phase in the CoCr alloy would account for reducing both abrasive and fatigue wear. Moreover, the Cu-bearing alloy presented relatively higher corrosion potential E and lower corrosion current density I compared to the Cu-free alloy. Accordingly, 3 wt.% Cu addition plays a key role in enhancing the wear resistance and corrosion resistance of CoCrW alloys, which indicates that the SLM CoCrW-3Cu alloy is a promising personalized alternative for traditional biomedical implant materials.
采用选择性激光熔化（SLM）工艺制备的含 3wt.%Cu 的 CoCrW 骨科植入物材料的微观结构、摩擦学性能和耐腐蚀性与 CoCrW 进行了系统研究。发现含 Cu 和无 Cu 合金中均存在等轴 γ 相和内部{111}<112>型孪晶及板条状 ε 相。与无 Cu 合金相比，添加 3wt.%Cu 显著增加了 ε 相的体积分数。在两种合金中，ε 相区的硬度（约为 4 倍）明显高于 γ 相区。尽管含 3wt.%Cu 的合金具有较高的摩擦系数，但它的磨损因子较小。CoCr 合金中的 ε 相会减少磨料和疲劳磨损。此外，与无 Cu 合金相比，含 Cu 合金的腐蚀电位 E 较高，腐蚀电流密度 I 较低。因此，添加 3wt.%Cu 可以提高 CoCrW 合金的耐磨性和耐腐蚀性，表明 SLM CoCrW-3Cu 合金是传统生物医学植入材料的一种有前途的个性化替代品。
