造孔剂法制备新型多孔Ti-Nb-Ta-Mo-Zr合金

Porous Ti-Nb-Ta-Mo-Zr Alloy for Biomedical Application Fabricated by Pore Former Method

以尿素、碳酸氢铵和硬脂酸三种不同的材料作为造孔剂,采用粉末冶金法制备出多孔Ti-Nb-Ta-Mo-Zr合金。比较了相同质量分数不同造孔剂对多孔钛合金的显微形貌、孔隙率、抗压强度和弹性模量的影响。结果表明,加入碳酸氢铵的多孔材料孔隙率为34.38%,大部分孔洞直径小于100μm,平均直径为60~80μm,出现超大孔洞的情况较少;且添加碳酸氢铵的多孔材料成孔均匀,孔洞大多为圆形或近圆形,其抗压强度为130.75MPa,弹性模量为9.562GPa,与人体骨骼的弹性模量相近。因此确定碳酸氢铵作为多孔Ti-2.1Nb-0.9Ta-14Mo-7Zr合金的造孔剂。

Taking Urea, NH4HCO3 and stearic acid as pore-forming agent, the porous Ti-Nb-Ta-Mo-Zr alloy was prepared by powder metallurgy. The effects of same mass fraction of different kinds pore-forming agent on the characterization of porous titanium alloy such as microscopic morphology, porosity, compressive strength and elastic modulus were studied. The results show that the poriness of adding NH4HCO3 to porous material is 34.38%. Most of the holes is less than 100 μm in diameter. The average diameter is between 60μm and 80μm. The porous materials has symmetrical holes and the holes are mostly round or suborbicular. The compressive strength of the alloy is 130.75MPa, and the elastic modulus is 9.562 GPa. It is similar to the elastic modulus of human bone. So NH4HCO3 is determinied as a porous Ti-2.1 Nb-0.9 Ta- 14Mo-7Zr alloy pore-forming agent.