SLM打印成形CoCrMo合金牙冠的表面粗糙度和硬度优化

Optimization of surface roughness and hardness for CoCrMo alloy dental crown manufactured by selective laser melting

为了改善选区激光熔化打印成形的CoCrMo合金牙冠的表面粗糙度和硬度,提高其与人体的适配性,分别采用了电解抛光和固溶处理方法对牙冠进行改善处理。测试了经不同电解液和电解参数抛光后的牙冠表面粗糙度以及经不同工艺固溶处理后牙冠的硬度,利用三维轮廓仪观察了抛光前后表面形貌,利用金相显微镜和扫描电子显微镜观察了微观组织。结果表明,SLM制备的CoCrMo合金牙冠在HNO3＋H3PO4体系电解液中抛光效果最佳,牙冠表面粗糙度较电解抛光前降低达70%以上;牙冠经1 503K固溶10h后,显微硬度可由固溶前的470HV降至350HV,与人体天然牙齿硬度相当。SLM制备的CoCrMo牙冠综合性能得到了显著的改善。

To ameliorate the surface roughness and hardness of CoCrMo alloy dental crown fabricated by selective laser melting（SLM）for enhancing the matching suitability between SLM parts and natural teeth,electrolytic polishing and solution treatment were carried out respectively.The surface roughness of the dental crown polished by different electrolytes and electrolytic parameters,and the hardness of the dental crown solution-treated by various parameters were measured.The surface morphology of the dental crown before and after the polishing was observed by three-dimension profiler.Meanwhile,the microstructure was observed by optical microscope and scanning electron microscope.The results show that the polishing effect of the dental crown polished by HNO3 and H3PO4 solution system reaches the maximum,where the roughness decreases by 70% compared to original state.When the dental crown is solution-treated at 1503 Kfor 10 h,the hardness decreases from 470 HV for no solution treatment state to 350 HV,which is equivalent to the value of human natural teeth.Overall performance of CoCrMo alloy dental crown improves a lot.