口腔修复中选区激光熔化工艺及性能研究

发布时间：2019-01-18 08:40

【摘要】：为实现医用钴铬合金在口腔修复中的应用,利用选区激光熔化(SLM)技术,研究开发了激光选区熔化成型工艺并进行了弯曲、拉伸、硬度以及热处理实验。利用扫描电镜、粗糙度轮廓仪、硬度仪等检测手段,对激光选区成型的试件进行了显微组织、力学性能、粗糙度、腐蚀性能等测试分析。研究结果表明,激光选区熔化成型最佳工艺参数为激光功率200 W、扫描速度500mm/s、层厚25μm、扫描间距0.07mm及扫描策略为S型X、Y方向、层错;SLM原始试样抗拉强度为1 185MPa、硬度为431HV、延伸率为8.6%、断裂形式为准解理断裂,热处理后抗拉强度为1 375MPa、硬度为563HV、伸长率为3.1%;SLM原始试样自腐蚀电位为-717mV、自腐蚀电流密度为1.7×10~(-5) A/cm~2,热处理后自腐蚀电位为-10mV、自腐蚀电流密度为0.3×10~(-5) A/cm~2;SLM原始样粗糙度为13.793μm、表面重熔后粗糙度降为5.141μm,打磨后粗糙度降为2.24μm。因此,热处理能提高试样的强度和耐腐蚀性,但韧性有所降低。最后利用优化的工艺参数,选区激光熔化成型制备出高强度、低粗糙度和耐腐蚀的牙冠牙桥,并进行佩戴实验,基本符合义齿的性能要求。
[Abstract]:In order to realize the application of medical cobalt-chromium alloy in oral prosthodontics, selective laser melting (SLM) technology was used to develop the laser selective melting molding process and the bending, stretching, hardness and heat treatment experiments were carried out. By means of scanning electron microscope, roughness profilometer and hardness tester, the microstructure, mechanical properties, roughness and corrosion resistance of the samples formed by laser selective forming were tested and analyzed. The results show that the optimum parameters of laser selective melting molding are laser power 200W, scanning speed 500mm / s, layer thickness 25 渭 m, scanning interval 0.07mm and scanning strategy S XY direction, stacking fault. The tensile strength, hardness and elongation of the original SLM specimen were 1 185 MPA, 431 HVV and 8.6, respectively. The tensile strength was 1 375 MPA, the hardness was 563 HVV, and the elongation was 3.1% after heat treatment. The corrosion potential of the original SLM sample is -717mV, the self-corrosion current density is 1.7 脳 10 ~ (-5) A / cm ~ (-2), the self-corrosion potential is -10 MV after heat treatment, and the self-corrosion current density is 0.3 脳 10 ~ (-5) A / cm ~ (-2). The roughness of the original SLM sample is 13.793 渭 m, the roughness of surface remelting is 5.141 渭 m, and the roughness after grinding is 2.24 渭 m. Therefore, heat treatment can improve the strength and corrosion resistance of the sample, but the toughness is reduced. Finally, a high strength, low roughness and corrosion resistant crown bridge was fabricated by selective laser melting molding with optimized process parameters, and the wear experiment was carried out, which basically met the performance requirements of denture.
【作者单位】：华南师范大学广东省微纳光子功能材料与器件重点实验室;广州瑞通激光科技有限公司;
【基金】：广东省科技资助项目(项目编号:2013B090600045,2013B090200003,2014B010131004,2014B010124002,2014B090903014,2015B090920003,2016B090917002,2016B090926004) 广东省研究生教育创新计划资助项目(项目编号:2013JDXM23) 广东省自然科学基金资助项目(项目编号:2016A030313456)
【分类号】：R783.1;TG665

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