Mechanical behaviors of porous Ti with high porosity and large pore size prepared by one-step spark plasma sintering technique
Mechanical behaviors of porous Ti with high porosity and large pore size prepared by one-step spark plasma sintering technique
复制标题
一步放电等离子烧结高孔隙率大孔径多孔钛的力学行为
DOI：
10.1016/j.vacuum.2015.09.024
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发表时间：
2015-12-01
期刊：
影响因子：
4
通讯作者：
Zhou, R.
中科院分区：
文献类型：
--
作者：
Zhang, L.;Zhang, Y. Q.;Zhou, R.
采用改进的模具结合间隔器(碳酸氢铵，NH4HCO3)技术，采用一步放电等离子烧结(SPS)法制备了孔隙率为38~56%、孔径为50~500 gm的多孔钛。通过改变烧结温度(1000-1200℃)，研究了多孔钛的孔特征和力学行为。结果表明，SPS法制备的多孔钛具有较大的塑性，压缩循环应力-应变曲线表现出非线性回复和滞后效应。随着烧结温度的升高，多孔钛的孔壁光滑致密，孔表面相对各向同性，弹性模量和抗压强度增加。在预应变为2%的条件下，经5次循环后的多孔钛的可回复应变率可达70%以上。当温度为1200℃时，多孔钛的连通孔特性、合适的弹性模数(11.2 Gpa，接近人骨)、较高的抗压强度(287 Mpa)和稳定的可恢复行为的良好组合，使该材料有可能用于承重硬组织植入物。(C)2015爱思唯尔有限公司。保留所有权利。
Porous Ti with 38-56% porosity and 50-500 gm pore size was prepared by one-step spark plasma sintering (SPS) method using modified mold combined with space holder (ammonium hydrogen carbonate, NH4HCO3) technique. Pore characteristics and mechanical behaviors of porous Ti were investigated by varying sintering temperatures (1000-1200 degrees C). Results showed that porous Ti prepared by SPS had large plasticity and the compressive cyclic stress-strain curves showed nonlinear recovery and hysteresis effect. With the sintering temperature increasing, smooth and dense pore walls, and relatively isotropic pore surface of porous Ti were obtained, the elastic modulus and compressive strength increased. The recoverable strain ratio of porous Ti after five cycles could reach more than 70% at the prestrain of 2%. When temperature was 1200 degrees C, the good combination of interconnected pore characteristics, proper elastic modules (11.2 GPa, close to that of human bones), higher compressive strength (287 MPa) and stable recoverable behaviors of porous Ti, made this material possible to be used for load-bearing hard tissue implants. (C) 2015 Elsevier Ltd. All rights reserved.