3D打印多孔钛支架微观孔隙结构和力学性能

发布时间：2018-01-29 05:43

本文关键词： D打印选择性激光熔化电子束熔化多孔钛支架　出处：《医用生物力学》2017年03期 　论文类型：期刊论文

【摘要】：目的研究3D打印技术制造的钻石分子结构多孔钛支架的微观孔隙结构和力学性能,指导3D打印多孔钛骨科植入物的开发。方法采用选择性激光熔化(selective laser melting,SLM)和电子束熔化(electron beam melting,EBM)两种金属3D打印制造工艺,制造钻石分子结构多孔Ti6Al4V支架。使用光学显微镜和扫描电镜观察其微观孔隙结构,并使用万能材料试验机对这些支架进行压缩测试。结果两种3D打印制造工艺都会存在加工误差,并且在表面存在半熔融金属颗粒。SLM工艺相对误差为20.9%~35.8%。EBM工艺相对误差为-9.1%~46.8%,且制造不出杆件宽度为0.2 mm的支架。SLM工艺制造的支架抗压强度为99.7~192.6 MPa,弹性模量为2.43~4.23 GPa。EBM工艺制造的支架抗压强度为39.5~96.9 MPa,弹性模量为1.44~2.83 GPa。结论 SLM工艺比EBM工艺制造精度高。支架的孔隙率是影响其抗压强度和弹性模量的主要因素,相同工艺的情况下,孔隙率越大,抗压强度越小,弹性模量也越小;相近孔隙率的情况下,SLM工艺比EBM工艺强度高,弹性模量也高。
[Abstract]:Objective to study the microstructure and mechanical properties of porous titanium scaffolds with diamond molecular structure fabricated by 3D printing technology. To guide the development of 3D printed porous titanium orthopedic implants. Methods selective laser melt selective laser melting was used. SLM) and Electron beam melting EBM (electron beam melting) are two metal 3D printing manufacturing processes. The porous Ti6Al4V scaffold with diamond molecular structure was fabricated. The microscopic pore structure of the scaffold was observed by optical microscope and scanning electron microscope. The compression test of these scaffolds was carried out with a universal material testing machine. As a result, there were machining errors in both 3D printing and manufacturing processes. And the relative error of semi-molten metal particle. SLM process is 20.9and 35.8. EBM process relative error is -9.1and 46.8%. The compressive strength of the scaffold made by SLM process is 99.7m ~ 192.6 MPa. The compressive strength of the scaffold fabricated by the elastic modulus of 2.43 ~ 4.23 GPa.EBM is 39.5 MPa. The elastic modulus is 1.44 ~ 2.83 GPa.Conclusion the SLM process is more accurate than the EBM process, and the porosity of the scaffold is the main factor affecting its compressive strength and elastic modulus. Under the same process, the larger the porosity, the smaller the compressive strength and the smaller the elastic modulus. Under the condition of similar porosity, the strength and elastic modulus of EBM process are higher than that of EBM process.
【作者单位】：上海交通大学机械与动力工程学院;
【基金】：国家自然科学基金项目(51475293)
【分类号】：R318.01;R687
【正文快照】： 在目前使用的生物医用金属材料中,钛合金具有优良的生物相容性和力学性能,在医学上被广泛地用于骨外科和牙科的植入物材料。但是钛合金的弹性模量和人体骨组织的弹性模量不匹配,会产生应力遮挡,导致人体骨组织的萎缩,造成植入失败。将钛合金制造成多孔结构,可以使得多孔钛合金

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