摘要
金属3D打印技术成为当前最具有发展潜力和发展前景的工业制造技术之一,通过激光选区融化(SLM)技术,选取合理的烧结参数,将金属粉末烧结成型。建立了不同孔径的多孔支架复杂三维模型,并通过有限元分析进行应力、应变的模拟分析,获得了优化后的多孔支架三维模型,为后续的实验研究分析建立理论基础,然后通过SLM烧结技术制备316L不锈钢多孔支架,通过后期热处理实验、压缩试验、金相实验,对多孔试样进行力学性能分析、硬度测试以及表面微观组织分析。通过模拟分析获得优化后的多孔支架孔径尺寸,获得了更适于人体骨骼缺损部位承重的多孔支架,可对后续研究进行指导。实验研究发现300μm孔径支架强度和弹性模量都高于天然骨,而成形多孔结构的金属件保证了骨骼修复体的生物力学性能,具有良好的力学性能。
Metal 3D printing technology has become one of the most potential and promising industrial manufacturing technologies.Through selective laser melting(SLM)technology,reasonable sintering parameters are selected to sinter metal powder.In the present paper,complex three-dimensional models of porous scaffolds with different pore sizes were established,and porous scaffold stress and strain distribution were simulated by finite element analysis.The optimized three-dimensional model of porous scaffolds was obtained.The theoretical basis for subsequent experimental analysis was established.Then 316L stainless steel porous scaffolds were prepared by SLM technology.The porous scaffolds were tested by post-heat treatment,compression and metallographic experiments.The mechanical properties,hardness tests and surface microstructures of the specimens were analyzed.Through the simulation analysis,the optimized pore size of the porous scaffold was obtained,and a porous scaffold which is more suitable for the weight bearing of the human bone defect site was obtained,which can guide the subsequent research.It is found that the strength and modulus of elasticity of 300μm porous scaffolds are higher than those of natural bone.Metal parts with porous structure ensure the biomechanical properties of bone prostheses and have good mechanical properties.
作者
徐淑波
孟子翔
刘鹏
任国成
景财年
Xu Shubo;Meng Zixiang;Liu Peng;Ren Guocheng;Jing Cainian(Shandong Jianzhu University,Jinan 250101,China;State Key Laboratory of Material Processing and Die&Mould Technology,Huazhong University of Science and Technology,Wuhan 430074,China)
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2020年第8期2786-2790,共5页
Rare Metal Materials and Engineering
基金
国家自然科学基金(41305124)
山东省重点研发计划(2017GGX30128)
2019年山东省新旧动能转换重大课题攻关项目。
关键词
3D打印
选区激光融化
有限元数值模拟
多孔支架
力学性能
3D printing
selective laser melting
finite element simulation
porous scaffolds
mechanical property
