选择性激光熔融技术成形牙科钴铬合金性能的初步研究

Basic Study on Selective Laser Melting Technique Formed to Dental Co-Cr Alloy

目的:通过测试选择性激光熔融(selective laser melting,SLM)技术制作的牙科钴铬(Co-Cr)合金的部分机械性能、表面显微结构、瓷熔附后的界面情况,以期为该技术的应用提供基础资料。方法:使用SLM技术制作牙科钴铬合金样品,用扫描电镜观察样品的表面形貌和显微结构、测试样品的密度和硬度;将样品经过除气-预氧化处理,用扫描电镜观察样品表面氧化膜的形貌和显微结构;将经过除气-预氧化处理的样品进行瓷熔附,用扫描电镜观察样品金-瓷界面的显微结构。结果:SLM制作的钴铬合金的硬度明显高于铸造钴铬合金;经过除气-预氧化处理后的氧化膜细密均匀;两种方法制作的合金在瓷熔附处理后的金-瓷界面均没有发现明显裂纹。结论:SLM技术比传统铸造技术具有一定的优越性,技术细节有待深入研究。

Objective： To investigate the surface condition and ion releasing behavior of cobalt-chromium （Co- Cr） dental alloy formed by selective laser melting （SLM） technique. Methods： Before porcelain fused sintering process, the surface condition was observed using a scanning electron microscope（SEM）, and then the density and hardness of the two alloys were examined. After porcelain fused firing, the interface of porcelain and alloy was observed. Results： SLM technique provide Co-Cr alloy higher hardness than traditional casting method, hwever the density of two alloys were same. After degassing-preoxidation procedure and porcelain fused firing, the interface of the two alloys with porcelain all showed excellent combination. Conclusions.. Considering the properties before and after porcelain fused sintering process, $LM technioue is suitable to form dental Co-Cr allov.