Abstract In the study, self-developed CoCrWCu gas-atomized powders with antibacterial activity were fabricated and used in selective laser melting (SLM). To determine whether a reliability of the SLMed CoCrWCu alloy for dental application could be obtained by using those powders, processing optimization was conducted to maximize density. Surface analysis and tensile tests were performed to verify an optimal processing parameter for fabrication of nearly full density alloy with few pores. Based on tailored parameter variation studies, a highly dense CoCrWCu alloy with 99.74% relative density could be fabricated at the energy input of 53.14 J/mm 3 . The outcome from tensile test suggested that the SLMed CoCrWCu alloy met the standard of ISO 22764 for dental restorations. SEM observation showed that an extremely fine microstructure with cellular and columnar structures was obtained in the SLMed CoCrWCu alloys. As such, a large density of bar-like precipitates was found to exist, which were confirmed to be sigma phase from the indexation of fast Fourier transform pattern. The preliminary antibacterial test indicated that the SLMed CoCrWCu alloy has an excellent antibacterial performance against E. coli . It was considered that the energy input of 53.14 J/mm 3 was promising candidate for fabricating the dense CoCrWCu alloy with acceptable properties and part reliability. Also, this study can thus aid in a further improvement of CoCrWCu powders.

中文翻译：

---

选择性激光熔化制备具有抗菌活性的 CoCrWCu 合金：致密化、力学性能和显微组织分析

摘要 本研究制备了自主研发的具有抗菌活性的CoCrWCu气雾化粉末，并将其用于选择性激光熔化（SLM）。为了确定是否可以通过使用这些粉末获得用于牙科应用的 SLMed CoCrWCu 合金的可靠性，进行了加工优化以最大化密度。进行表面分析和拉伸试验以验证用于制造几乎全密度且几乎没有孔隙的合金的最佳工艺参数。基于定制的参数变化研究，可以在 53.14 J/mm 3 的能量输入下制造具有 99.74% 相对密度的高密度 CoCrWCu 合金。拉伸试验结果表明 SLMed CoCrWCu 合金符合 ISO 22764 牙科修复标准。SEM 观察表明，在 SLMed CoCrWCu 合金中获得了具有蜂窝状和柱状结构的极细微观结构。因此，发现存在大密度的棒状沉淀物，从快速傅里叶变换模式的指数化证实它们是σ相。初步抗菌试验表明，SLMed CoCrWCu合金对大肠杆菌具有优良的抗菌性能。据认为，53.14 J/mm 3 的能量输入是制造具有可接受的性能和部件可靠性的致密 CoCrWCu 合金的有希望的候选者。此外，这项研究有助于进一步改进 CoCrWCu 粉末。从快速傅里叶变换模式的索引中确认为西格玛相位。初步抗菌试验表明，SLMed CoCrWCu合金对大肠杆菌具有优良的抗菌性能。据认为，53.14 J/mm 3 的能量输入是制造具有可接受的性能和部件可靠性的致密 CoCrWCu 合金的有希望的候选者。此外，这项研究有助于进一步改进 CoCrWCu 粉末。从快速傅里叶变换模式的索引中确认为 sigma 相位。初步抗菌试验表明，SLMed CoCrWCu合金对大肠杆菌具有优良的抗菌性能。据认为，53.14 J/mm 3 的能量输入是制造具有可接受的性能和部件可靠性的致密 CoCrWCu 合金的有希望的候选者。此外，这项研究有助于进一步改进 CoCrWCu 粉末。