Effects of Sintering Temperature on the Porosity and Mechanical Behavior of Porous Titanium Scaffolds Prepared by Freeze-Casting
Journal of Materials Engineering and Performance(2019)
摘要
The purpose of this study was to investigate the effects of sintering temperature on the microstructure, and associated mechanical properties of porous titanium scaffolds prepared by freeze-casting. Sintering temperature significantly influenced the porosity and the mechanical properties of the titanium scaffolds. The porosity decreased from 60 to 20% as the sintering temperatures increased from 800 to 1100 °C. The scaffolds were of an open pore structure with pore sizes ranging from 2 to 20 μm. The average wall thickness of the porous titanium was measured, using a micro-computed tomography, to be in the range from 9.2 to 26.2 μm. Elastic modulus was between 2 to 7 GPa, depending on vacuum annealing conditions. The compression strength of the scaffolds may exceed 1000 MPa as the sintering temperature higher than 1000 °C. The increase in titanium strength and stuffiness could be mainly attributed to the decrease in porosity as well as the increase in wall thickness.
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关键词
freeze-casting,mechanical strength,porous titanium,sintering temperature
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