华西口腔医学杂志2024，Vol.42Issue(4)：462-469,8.DOI:10.7518/hxkq.2024.2023400
激光工艺参数对激光选区熔化牙科钴铬合金孔隙、表面粗糙度和硬度的影响
Effect of laser process parameters on the pores,surface roughness,and hardness of laser selective melting of den-tal cobalt-chrome alloys
摘要
Abstract
Objective To address the quality problems caused by high porosity in the preparation of dental cobalt-chrome alloy prosthetics based on selective laser melting(SLM)technology,we investigated the influence mechanism of different forming process parameters on the microstructure and properties of the materials.Moreover,the range of form-ing process parameters that can effectively reduce defects was precisely defined.Methods The effects of laser power,scanning speed,and scanning distance on the pore properties,surface roughness,and hardness of dental cobalt-chrome al-loy were investigated by adjusting the printing parame-ters in the process of SLM.Through metallographic anal-ysis,image analysis,and molten pool simulation,the pore formation mechanism was revealed,and the relation-ship between the porosity and energy density of SLM dental cobalt-chrome alloy was elucidated.Results When the linear energy density was higher than 0.18 J/mm,the po-rosity defect easily appeared at the bottom of the molten pool.When the laser energy density was lower than 0.13 J/mm,defects occurred in the gap of the molten pool due to insufficient melting of powder.In particular,when the linear energy density exceeded the threshold of 0.30 J/mm or was below 0.12 J/mm,the porosity increased significantly to more than 1%.In addition,we observed a negative correlation between free surface roughness and energy density and an inverse re-lationship between macroscopic hardness and porosity.Conclusion On the basis of the conditions of raw materials and molding equipment used in this study,the key process parameters of SLM of molding parts with porosity lower than 1%were successfully determined.Specifically,these key parameters included the line energy density,which ranged from 0.13 J/mm to 0.30 J/mm,and the scan spacing should be strictly controlled below 90 μm.关键词
激光选区熔化/口腔修复体/牙科钴铬合金Key words
selective laser melting/oral prosthesis/dental cobalt-chrome alloy分类
医药卫生引用本文复制引用
桑磊,颜家振,李宁,辛成来,王群,刘畅..激光工艺参数对激光选区熔化牙科钴铬合金孔隙、表面粗糙度和硬度的影响[J].华西口腔医学杂志,2024,42(4):462-469,8.基金项目
Project of Science and Technology Department of Sichuan Province(2022NSFSC0328) （2022NSFSC0328）
Youth Project of Science and Technology of Sichuan Province(2022NSFSC2007) 四川省科技厅面上项目(2022NSFSC0328) （2022NSFSC2007）
四川省科技厅青年项目(2022NSFSC2007) （2022NSFSC2007）
