由氧化钙颗粒稳定的纯镁泡沫

IF 2.5 4区材料科学 Q2 CHEMISTRY, APPLIED

Journal of Porous Materials Pub Date : 2024-04-28 DOI:10.1007/s10934-024-01609-5

Akshay Devikar, G.S. Vinod Kumar

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引用次数: 0

摘要

本研究开发了由原位添加的氧化钙颗粒稳定的纯镁泡沫。Mg/xCaO 泡沫（x = 5、7 和 10 wt.%）的孔隙分布均匀，孔壁横截面较薄但稳定。在 Mg-CaO 的界面上形成了 Mg-Ca-O 过渡相和 MgO 颗粒，这改善了 CaO 颗粒在镁熔体中的润湿性。CaO 颗粒、Mg-Ca-O 过渡相和块状 MgO 颗粒共同稳定了泡沫。Mg-Ca-O 和 MgO 相沿着泡沫的气液界面分散，从而防止了凝固过程中界面起皱。对 Mg/10wt.% CaO 泡沫粉末的 TEM 分析也证实了不同形态的纳米级（约 200 nm）氧化镁颗粒的形成。TG-DSC 分析证实，Mg-CaO 在 610 ºC 时发生放热反应，形成 Mg2Ca 和 MgO 相，XRD 分析也确定了这一点。就平均孔径（2.19 毫米）和圆度（0.75）而言，添加 7 wt.% CaO 的泡沫结构最佳。氧化镁/10 重量百分比 CaO 泡沫的泡沫密度最低，为 0.38 克/立方厘米，相对密度为 21%。

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Pure Mg foams stabilized by CaO particles

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Pure Mg foams stabilized by CaO particles

Pure Mg foams stabilized by ex-situ added CaO particles were developed in this study. Mg/xCaO foams (x = 5, 7 and 10 wt.%) exhibited uniform pore distribution, thinner yet stable pore wall cross-sections. Mg-Ca-O transition phase and MgO particles were formed at the interface of Mg-CaO, which improved the wetting of CaO particles in the Mg melt. The CaO particles, Mg-Ca-O transition phase and blocky MgO particles collectively stabilized the foam. Mg-Ca-O and MgO phases disperse along the gas-liquid interface of foams thereby preventing from wrinkling of interfaces during solidification. TEM analysis of Mg/10wt.% CaO foam powder also confirmed the formation of nano-sized (~ 200 nm) MgO particles of different morphologies. TG-DSC analysis confirmed the exothermic Mg-CaO reaction at 610 ºC, resulting in formation of Mg₂Ca and MgO phases, as identified using XRD analysis. 7 wt.% CaO addition exhibited the best foam structure in terms of mean pore diameter (2.19 mm) and circularity (0.75). The lowest foam density of 0.38 g/cm³ and relative density of 21 % was achieved in case of Mg/10wt.% CaO foams.

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来源期刊

Journal of Porous Materials 工程技术-材料科学：综合

CiteScore

4.80

自引率

7.70%

发文量

203

审稿时长

2.6 months

期刊介绍： The Journal of Porous Materials is an interdisciplinary and international periodical devoted to all types of porous materials. Its aim is the rapid publication of high quality, peer-reviewed papers focused on the synthesis, processing, characterization and property evaluation of all porous materials. The objective is to establish a unique journal that will serve as a principal means of communication for the growing interdisciplinary field of porous materials. Porous materials include microporous materials with 50 nm pores. Examples of microporous materials are natural and synthetic molecular sieves, cationic and anionic clays, pillared clays, tobermorites, pillared Zr and Ti phosphates, spherosilicates, carbons, porous polymers, xerogels, etc. Mesoporous materials include synthetic molecular sieves, xerogels, aerogels, glasses, glass ceramics, porous polymers, etc.; while macroporous materials include ceramics, glass ceramics, porous polymers, aerogels, cement, etc. The porous materials can be crystalline, semicrystalline or noncrystalline, or combinations thereof. They can also be either organic, inorganic, or their composites. The overall objective of the journal is the establishment of one main forum covering the basic and applied aspects of all porous materials.