基于杨氏模量可控多孔钛微观组织和力学性能研究（英文）

发布时间：2018-05-15 05:15

本文选题：多孔钛 + 钛网层叠烧结法　；参考：《稀有金属材料与工程》2017年08期

【摘要】：因为人体植入物的杨氏模量远大于骨组织将会带来应力屏蔽,所以降低人体植入物的杨氏模量对于提高植入物器件在人体的服役寿命具有十分重要的作用。采用一种新型的钛网层叠烧结法制备多孔钛,研究多孔钛的微观孔形貌,压缩变形特点和具有可控性的多孔钛孔隙率、孔径大小和孔分布对多孔钛微观组织及力学性能的影响。结果表明:钛网层叠烧结法制备的多孔钛在微观结构上,不同方向具有不同的微观孔形貌,因而使多孔钛具有异性;轴向压缩应力应变曲线表明多孔钛具有平稳、光滑的弹性和塑性变形行为;当增加孔隙率,或相同孔隙率下,减小孔名义尺寸,改变孔分布由规则到错排时,均能降低多孔钛的弹性模量。因此,通过调控多孔钛的这些结构参数,可使其具有与不同骨组织相匹配的力学性能和利于骨组织长入的孔径尺寸。作为植入物材料的多孔钛具有的这种与骨组织适配的孔结构和力学性能,在延长植入物器件的服役寿命上具有很大的潜力。
[Abstract]:Because the Young's modulus of human implants is much larger than that of bone tissue, it is very important to reduce the Young's modulus of implants in order to improve the service life of implants. Porous titanium was prepared by a new titanium mesh stacking sintering method. The microstructure of porous titanium, the characteristics of compression deformation and the effects of porous titanium porosity, pore size and pore distribution on the microstructure and mechanical properties of porous titanium were studied. The results show that the porous titanium prepared by the titanium mesh stacking sintering method has different micropore morphology in different directions, which makes porous titanium have heterogeneity, and the axial compression stress-strain curve shows that porous titanium has stable microstructure. The elastic modulus of porous titanium can be reduced by decreasing the nominal size of the pore and changing the distribution of the pore from regular to staggered when the porosity or the same porosity increases the elastic and plastic deformation behavior of the porous titanium. Therefore, by adjusting these structural parameters of porous titanium, it can have mechanical properties matching different bone tissues and favorable pore size for bone tissue growth. Porous titanium, as an implant material, has this kind of pore structure and mechanical properties suitable for bone tissue, which has great potential in prolonging the service life of implants.
【作者单位】：西北工业大学凝固技术国家重点实验室;西部超导材料科技股份有限公司;
【基金】：National Key Basic Research Development Program of China(“973”Program)(2012CB619101)
【分类号】：R318.08;TG146.23

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