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基于杨氏模量可控多孔钛微观组织和力学性能的研究
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西北工业大学 凝固技术国家重点实验室 西安,西北工业大学 凝固技术国家重点实验室 西安,西北工业大学 凝固技术国家重点实验室 西安,西北工业大学 凝固技术国家重点实验室 西安,西北工业大学 凝固技术国家重点实验室 西安,西北工业大学 凝固技术国家重点实验室 西安

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国家重点基础研究发展计划(973计划)


Microstructure and mechanical properties of porous titanium based on controlling Young’s modulus
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State Key Laboratory of Solidification Processing,Northwest Polytechnical University,Xi’an,State Key Laboratory of Solidification Processing,Northwest Polytechnical University,Xi’an,State Key Laboratory of Solidification Processing,Northwest Polytechnical University,Xi’an,State Key Laboratory of Solidification Processing,Northwest Polytechnical University,Xi’an,State Key Laboratory of Solidification Processing,Northwest Polytechnical University,Xi’an,State Key Laboratory of Solidification Processing,Northwest Polytechnical University,Xi’an

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    摘要:

    人体植入物的杨氏模量在减少因植入物杨氏模量远大于骨组织而带来的应力屏蔽,提高植入物器件在人体的服役寿命具有十分重要的作用。本文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。研究结果表明:这种方法制备的多孔钛在微观结构上具有不同方向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。这种与骨组织适配的力学性能和孔结构,在提高植入物器件的服役寿命具有很大的潜力。

    Abstract:

    The Young’s modulus of implant plays an important role in reducing stress shielding. A new method called titanium mesh the stacked-forced-sintering (TMSS) was applied to porous titanium, which easily control Young’s modulus and balance the mechanical properties by different porosities, pore sizes and pore distribution. The results show that porous titanium has different structures in different directions. It has regular macro-pores in the cross section and irregular micro-pores in the longitudinal section. The stress-strain curve of porous titanium shows smooth and stable increase at plastic deformation along the axis direction. The young’s modulus obviously decreases, when increasing the porosity, decreasing nominal pore size, and changing pore distribution from regular to staggered at the same porosity. So the Young’s modulus of porous titanium can be adjusted by these architecture factors to match the different bone tissues, and the appropriate pore sizes have the potential to induce bone tissue ingrowth. The match of mechanical properties and appropriate structures can effectively promote the fixation between the implant and the bone tissue in a long term.

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徐广胜,寇宏超,刘向宏,李福平,李金山,周 廉.基于杨氏模量可控多孔钛微观组织和力学性能的研究[J].稀有金属材料与工程,2017,46(8):2041~2048.[XU Guangsheng, KOU Hongchao, LIU Xianghong, LI Fuping, LI Jinshan, ZHOU Lian. Microstructure and mechanical properties of porous titanium based on controlling Young’s modulus[J]. Rare Metal Materials and Engineering,2017,46(8):2041~2048.]
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  • 收稿日期:2015-06-23
  • 最后修改日期:2015-09-06
  • 录用日期:2015-09-25
  • 在线发布日期: 2017-11-16
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