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以NH_4HCO_3为造孔剂,采用粉末冶金法在10-3 Pa的真空度下成功烧结出力学性能与骨匹配的多孔钛。利用扫描电镜观察孔的结构,采用X射线衍射仪分析物相组成,利用阿基米德浮水法测定开孔隙率,利用万能材料试验机测量力学性能。结果表明,多孔钛烧结体的主要相为α-Ti,随着造孔剂添加量的改变,并没有出现新相;多孔钛烧结体的开孔隙率范围在6.9%~65.7%之间,且开孔隙率越大平均孔径也越大;抗压强度随开孔隙率的增大而降低,在50~1 558 MPa之间;当造孔剂含量在30%~50%时,所得制品弹性模量在4.1~9.4GPa,理论上很接近人骨的弹性模量(2.3~20GPa)。
With NH_4HCO_3 as pore-forming agent, the porous titanium with mechanical properties and bone matching was successfully sintered by the powder metallurgy method at a vacuum of 10-3 Pa. The structure of the pores was observed by scanning electron microscopy. The phase composition was analyzed by X-ray diffractometer. The open porosity was measured by Archimedes floating method. The mechanical properties were measured by universal testing machine. The results show that the main phase of the porous titanium sintered body is α-Ti, and no new phase appears with the addition of pore-forming agent. The open porosity of the porous titanium sintered body ranges from 6.9% to 65.7% The larger the open porosity is, the larger the average pore diameter is. The compressive strength decreases with the increase of the open porosity between 50 and 1 558 MPa. When the content of pore former is between 30% and 50% The amount of 4.1 ~ 9.4GPa, in theory, very close to the human bone elastic modulus (2.3 ~ 20GPa).