钛合金植入物梯度孔结构设计及其力学性能

Gradient Pore Structure Design and Mechanical Properties Analysis of Titanium Alloy Implant

摘要:

植入物多孔结构的设计研究多以规则孔结构为主,而少有针对梯度孔结构设计。本文提出平面center及空间sphere两种梯度圆孔设计方法,实现完成对某一平面center梯度孔的植入物结构设计,采用激光选区熔化技术(Selective Laser Melting, SLM)制备出孔隙率为75%的医用钛合金Ti6Al4V梯度孔与规则孔结构植入物样件,进行微观材料表征和力学性能测试,得到相关力学数据。结果表明：该种梯度孔结构的力学性能优于规则孔,在孔隙率为75%的条件下,梯度孔样件的平均弹性模量较规则孔高36.25%,平均抗压强度提高29.9%。

Abstract:

For the design of pore structure of titanium alloy implants, most of the current researches are on regular pore structures, while few of them are concerned with the design of gradient pore structures. In this research, two methods of designing circular pores with Planar Center Gradient and Spatial Sphere Gradient are proposed. On this basis, a certain model design of Planar Center Gradient is completed, some samples of titanium alloy gradient pore and regular pore structure implants with a porosity of 75% were fabricated by Selective Laser Melting(SLM), and made microscopic material characterization. Through the test of mechanical properties, the related mechanical data are obtained. Conclusion: The mechanical properties of the gradient pore structure are better than those of regular pores. Under the condition of porosity of 75%, the average elastic modulus of gradient pore sample is 36.25% higher than that of regular pore and the average compressive strength is increased by 29.9%.