【摘要】 采用放电等离子烧结技术制备多孔Zn-Mg合金,探讨了Mg含量对多孔合金孔隙特征和力学性能的影响,并分析了多孔Zn-Mg合金的断裂失效机制。结果表明,在造孔剂(NaCl)体积分数固定前提下当Mg含量从5%增加至15%(质量分数),由于在去除造孔剂的过程中去合金化作用,孔隙率从40.3%提升至54.3%,表面开孔直径从289μm增加到384μm。力学测试结果表明,多孔Zn-Mg合金为一种弹脆性多孔材料;3种组分中多孔Zn-10Mg合金力学性能最好,其强度与弹性模量均能满足作为承受低载荷松质骨的需求。更多还原

【Abstract】 Porous Zn-x Mg alloy scaffolds(x=5 wt%, 10 wt%, 15 wt%) were fabricated as bone tissue engineering scaffold by spark plasma sintering(SPS) using the same volume content space holder(NaCl). The effect of Mg content on the mechanical properties and microstructural characterizations of the porous Zn-x Mg alloys scaffold was revealed. Results show that with the increasing content of Mg from 5 wt% to 15 wt%, the porosity increases from 40.3% to 54.3% and the mean open pore size increases from 289 μm to 384 μm due to the dealloying effect of Mg. Mechanical test results indicate that porous Zn-Mg alloy is a typical elastic-brittle metallic foam and porous Zn-10 Mg is the best among three scaffolds. The strength and elastic module of the scaffolds show good biomechanical compatibility and is promising to be used as a lower load-bearing implant material.更多还原