Abstract

Fabrication and characterization of Mg-based scaffolds by infiltration casting, without protective cover gas, are presented. Distinctive results were observed among the foams depending on the precise selection of casting variables. Foams with pore sizes ranging from 590 to 1040 µm, porosities ranging from 60.01 to 79.35%, and measured Young’s moduli ranging from 0.8 to 1.9 GPa, were obtained. These architected parameters for this cellular material were found to match the structural properties of cancellous bone while satisfying the mechanical requirements to support the bone healing process (0.3-3 GPa). Casting temperature and melting time were set at 680 °C and 10 min for infiltrating 590 µm salt particles. A salt flux combination containing MgCl₂, MgO, CaF₂, and KCl, is used to protect the molten metal, and its effect on ignition and oxidation of the Mg alloy is evaluated. The results of the crystalline phase and chemical analysis indicate a safe production process since there is no evidence of high contamination or new-formed phases.

中文翻译：

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不带保护盖气的熔铸镁基泡沫塑料的合成与性能

摘要

提出了无保护盖气的浸渗铸造镁基支架的制备和表征。在泡沫中观察到不同的结果，这取决于浇铸变量的精确选择。得到的泡沫的孔径为590〜1040μm，孔隙率为60.01〜79.35％，测得的杨氏模量为0.8〜1.9GPa。发现该细胞材料的这些设计参数与松质骨的结构特性匹配，同时满足了支持骨愈合过程（0.3-3 GPa）的机械要求。铸造温度和熔化时间设置为680°C，渗透时间为10分钟，以渗透590 µm盐颗粒。包含MgCl ₂，MgO和CaF _2的盐熔剂组合，以及KCl，用于保护熔融金属，并评估其对Mg合金着火和氧化的影响。结晶相和化学分析的结果表明生产过程是安全的，因为没有证据表明存在高污染或新形成的相。