CAJ | 학술논문

从生物学角度出发设计并制备2种不同孔径分布的多孔钛，并研究其力学性能。采用造孔剂烧结方法制备孔隙率为36%~63%的多孔钛，通过室温压缩测试其力学性能。多孔钛的弹性模量和抗压强度分别在2.662~18 GPa和94.05~468.57 MPa范围内，且都随着孔隙率的增加而降低。抗压强度和孔隙率的关系曲线呈现完全的线性特征，表明抗压强度主要受孔隙率的影响，几乎不受孔径的影响。Gibson-Ashby力学关系分析结果显示：常数项C值的差异说明孔径分布对多孔钛的屈服强度有一定的影响；密度指数n值均大于临界值3，表明这2种不同孔径的多孔钛的变形方式相同，为孔壁的屈曲作用。
종생물학각도출발설계병제비2충불동공경분포적다공태，병연구기역학성능。채용조공제소결방법제비공극솔위36%~63%적다공태，통과실온압축측시기역학성능。다공태적탄성모량화항압강도분별재2.662~18 GPa화94.05~468.57 MPa범위내，차도수착공극솔적증가이강저。항압강도화공극솔적관계곡선정현완전적선성특정，표명항압강도주요수공극솔적영향，궤호불수공경적영향。Gibson-Ashby역학관계분석결과현시：상수항C치적차이설명공경분포대다공태적굴복강도유일정적영향；밀도지수n치균대우림계치3，표명저2충불동공경적다공태적변형방식상동，위공벽적굴곡작용。
To satisfy the mechanical and biological requirement of porous bone substitutes, porous Ti with two different pore sizes designed in advance was fabricated by the space-holder sintering process. Mechanical properties of the porous Ti were explored via room temperature compressive tests. The pore sizes and shapes are uniform throughout the specimens with porosities ranging from 36%to 63%. The compression strength and the elastic modulus are in the range from 94.05 to 468.57 MPa and 2.662 to 18 GPa, respectively. It is worth noting that the relationship between the compressive strength and the porosities is completely linear relation beyond the effect of pore size distributions on the mechanical properties. The value of the constant C achieved from the Gibson-Ashby model suggests that the pore sizes affect the yield strength of the porous Ti and the values of density exponent (n) for porous Ti with two different pore sizes are higher than 2, which suggests that the deformation mode of the porous Ti with a porosity ranging from 36%to 63%is mainly buckling of the cell struts.