凝胶注模工艺制备医用多孔Ti-Co合金的性能

Mechanical Properties of Porous Ti-Co Alloy for Medical Application by Gelcasting

摘要:

采用凝胶注模工艺制备含8%和12%Co（质量分数，下同）的多孔Ti-Co合金，研究获得均匀悬浮稳定浆料的分散剂加入量。采用扫描电子显微镜、X射线衍射、压缩和三点弯曲试验分别对多孔Ti-Co合金的显微结构和力学性能进行了测试和分析。结果表明，加入1%分散剂可获得分散效果最佳的悬浮浆料，所制备多孔Ti-Co合金的孔隙率在50%左右，孔隙呈三维通孔结构。与多孔纯钛相比，添加Co元素明显提高了多孔Ti的力学性能，其中压缩强度在68~378 MPa之间，抗弯曲强度在53.68~169.17 MPa之间，弹性模量在7~21 GPa之间。固相体积分数为33%，在1100 ℃下烧结的多孔Ti-8%Co合金由于与成人骨的力学相容性最好，适合作为医用植入材料。

Abstract:

Porous titanium based alloys containing 8 wt% and 12 wt% cobalt elements were prepared by gelcasting methods. The concentration of dispersant for obtain the stable suspension slurry were studied. The microstructure, the total porosity and the mechanical properties of the sintered porous Ti-Co alloys were investigated by scaning electronic microscopy, X-ray diffraction, compression and bending tests. The results show that 1 wt% of the optimal dispersant amount is selected, at which viscosity of the suspension slurry is low. Open and closed three-dimensional pore morphologies and total porosity around 50% can be achieved. In contrast to porous Ti by gelcasting available before, porous Ti-Co alloys present excellent properties. The compressive strength ranging from 68-378 MPa, the bending strength ranging from 53.68-169.17 MPa and Young's modulus ranging from 7-21 GPa. In this study, porous Ti-8Co alloy (33 vol%) which have great properties matching adult bone, therefore being suited for medical applications.