医用多孔Ti-10Mo合金的制备及力学性能

The preparation and mechanical properties of porous Ti - 10 Mo alloy for biomedical applications

摘要:

以元素粉末为原料添加造孔剂碳酸氢铵,采用粉末冶金模压烧结技术制备了多孔Ti-10Mo合金,探讨了烧结工艺与造孔剂含量对合金组织、孔隙特征和力学性能的影响规律。结果表明,在1300℃烧结可制备出具有典型魏氏体组织、孔隙分布均匀的多孔Ti-10Mo合金材料；随着造孔剂含量增加,合金孔隙率增加,孔径变大孔壁变薄,当造孔剂含量达到50%,孔隙结构互相贯通,孔径尺寸大幅增加；添加50~60%造孔剂,制备Ti-10Mo合金孔隙率为62.8%~66.9%,平均孔径尺寸为485~545μm,其弹性模量为2.9~1.3GPa,抗压屈服强度为129.2~56.1GPa。

Abstract:

The porous Ti-10Mo alloys from elemental powders were fabricated by powder metallurgy technique with ammonium bicarbonate as the space-holder. The effects of sintering process and space-holder content on the microstructure, porous characteristics and mechanical properties were studied. The results show that at sintering temperature of 1300℃ the porous Ti-Mo alloys with uniform microstructure and pore distribution can be produced, and the alloy exhibit a typical Widmanstatten structure. With the increase of the space-holder content, the pores become larger and the hole wall gets thinner. At or above 50wt% of space-holder, pores are interconnected, leading to forming a three-dimensional connectivity structure. When the space-holder content is in the range of 50%~60% , the alloys obtained show porosity of 62.8%~66.9%, and their elastic modulus and compressive yield strength vary from 2.9 to 1.3 GPa, and from 129.2 to 56.1 MPa, respectively.