多孔Ti-5Ag合金的制备及力学性能研究

Preparation and Mechanical Properties of Porous Ti-5Ag Alloy

以钛粉和银粉为原料,不同含量的碳酸氢铵为占位剂,采用粉末冶金的方法制备多孔Ti-5Ag合金。结果表明制备的多孔Ti-5Ag合金的相组成为α-Ti。随着碳酸氢铵添加量的增加,多孔Ti-5Ag合金的密度逐渐降低,孔隙率逐渐增加。形貌观察表明随着孔隙率的增加,多孔Ti-5Ag合金中大孔的数量增多,并且孔与孔之间的连通性增加;力学测试显示其弹性模量和抗压强度均降低。多孔Ti-5Ag合金的力学性能可以通过控制碳酸氢铵的添加量调整到与人体骨匹配,有潜力作为多孔抗菌植入体用于骨科。

In this study,porous Ti-5 Ag alloy was fabricated by powder metallurgy approach with Ti and Ag powders as raw materials and different content of NH4 HCO3 as space holder.The results show that the phase composition of the porous Ti-5 Ag alloy is α-Ti. With increase of NH4HCO3 addition,the density of the alloy gradually decreases,and its porosity increases.Morphological observations show that with the porosity increased the number of macropores of Ti-5 Ag alloy raises and the connectivity during pores also increases.Meanwhile,both of the elastic modulus and compressive strength of the porous Ti-5 Ag alloy are reduced with increase of porosity,according to the mechanical tests. The mechanical properties of porous Ti-5 Ag alloy could be adjusted to match with the human bones by controlling the amount of NH4HCO3,which has the potential to be used as a porous antimicrobial implant for orthopedics.