以NH_4HCO_3为造孔剂制备的多孔钛及其力学性能

Preparation of Porous Titanium with NH_4HCO_3 as a Space Holder by Powder Metallurgy and Its Mechanical Properties

以NH4HCO3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501 558 MPa之间;当造孔剂含量在30%50%时,所得制品弹性模量在4.19.4GPa,理论上很接近人骨的弹性模量（2.320GPa）。

Porous titanium was prepared by powder metallurgy with NH4HCO3 as space holder at 10-3 Pa and its mechanical properties can match with bone.The microstructures,phase constituent and porosity of the porous titanium were investigated by SEM,XRD and Archimedes’ testing,and the mechanical properties of the porous Ti were tested by electronic universal material test machine.The results reveal that with the change of space holder addition,the main phase of the porous titanium remainsα-Ti phase,and its porosity is in range of 6.9%65.7%,and the higher the porosity is,the greater the average pore diameter is.Meanwhile,with the increase of the porosity,the compressive strength of the porous Ti is in range of 50 and 1 558 MPa.With the content of space holder in range of 30% 50%,the elastic modulus of porous titanium reaches 4.1to 9.4GPa,which is very close to the bone’s elastic modulus（2.320GPa）in theory.