Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, 155 Yangqiao Road West, Fuzhou, China.
Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang, China.
Mater Sci Eng C Mater Biol Appl. 2015 Apr;49:517-525. doi: 10.1016/j.msec.2015.01.023. Epub 2015 Jan 8.
In this study, an experimental investigation on fabricating Ni-free CoCrW alloys by selective laser melting (SLM) for dental application was conducted in terms of microstructure, hardness, mechanical property, electrochemical behavior, and metal release; and line and island scanning strategy were applied to determine whether these strategies are able to obtain expected CoCrW parts. The XRD revealed that the γ-phase and ε-phase coexisted in the as-SLM CoCrW alloys; The OM and SEM images showed that the microstructure of CoCrW alloys appeared square-like pattern with the fine cellular dendrites at the borders; tensile test suggested that the difference of mechanical properties of line- and island-formed specimens was very small; whilst the outcomes from the electrochemical and metal release tests indicated that the island-formed alloys showed slightly better corrosion resistance than line-formed ones in PBS and Hanks solutions. Considering that the mechanical properties and corrosion resistance of line-formed and island-formed specimens meet the standards of ISO 22674:2006 and EN ISO 10271, CoCrW dental alloys can be successfully fabricated by line and island scanning strategies in the SLM process.
本研究通过选择性激光熔化（SLM）技术对无镍 CoCrW 合金进行了实验研究，探讨了其在牙科领域的应用，包括微观结构、硬度、力学性能、电化学行为和金属释放等方面；并采用线扫描和岛扫描策略来确定这些策略是否能够获得预期的 CoCrW 零件。XRD 分析表明，SLM 制备的 CoCrW 合金中存在γ相和ε相；OM 和 SEM 图像显示，CoCrW 合金的微观结构呈方形图案，边界处有细小的胞状树枝晶；拉伸试验表明，线扫描和岛扫描成形试样的力学性能差异很小；而电化学和金属释放试验的结果表明，在 PBS 和 Hank's 溶液中，岛扫描成形的合金比线扫描成形的合金具有更好的耐腐蚀性。考虑到线扫描和岛扫描成形试样的力学性能和耐腐蚀性均符合 ISO 22674:2006 和 EN ISO 10271 标准，因此 CoCrW 牙科合金可以通过 SLM 工艺中的线扫描和岛扫描策略成功制备。
