发泡法和溶胶-凝胶法制备镁质多孔材料

发布时间：2018-02-28 01:39

本文关键词： 发泡法溶胶-凝胶法镁质多孔材料凝胶骨架　出处：《无机盐工业》2017年01期 　论文类型：期刊论文

【摘要】：对比分析了发泡法和溶胶-凝胶法制备镁质多孔材料的组成、结构及性能。发泡法制备镁质多孔材料是以菱镁矿浮选尾矿和电熔镁砂为主要原料,加入六偏磷酸钠、柠檬酸钠及α-氧化铝粉为添加剂,并以十二烷基磺酸钠发泡和糊精稳泡的方式制备预混料浆,经注浆成型、养护、干燥及烧成工序制得多孔材料。溶胶-凝胶法制备氧化镁多孔材料是以六水氯化镁为前驱体,以聚氧乙烯(PEO)为相分离诱导剂及环氧丙烷(PO)为凝胶促进剂,经过陈化、干燥及烧成工序最终得到氧化镁多孔材料。结果表明:发泡法制备多孔材料的气孔尺寸可控,大多为封闭气孔,且生产工艺过程简单,同时以菱镁矿浮选尾矿为主要原料,大大缩短了生产成本。与发泡法相比,溶胶-凝胶法制备的氧化镁多孔材料结构更为疏松,形成的凝胶骨架使得基体韧性增强,烧成后形成三维网络贯通气孔,气孔孔径细小且均匀,气孔尺寸多为纳米级,此外烧后试样全部为方镁石相。
[Abstract]:The composition, structure and properties of magnesia porous materials prepared by foaming method and sol-gel method were compared and analyzed. The main raw materials were magnesite flotation tailings and fused magnesite, and sodium hexametaphosphate was added. Sodium citrate and 伪 -alumina powder were used as additives, and the premixed slurry was prepared by foaming sodium 12 alkyl sulfonate and stabilizing dextrin. The porous materials were prepared by the drying and sintering process. The porous materials were prepared by sol-gel method using magnesium chloride hexahydrate as precursor, polyoxyethylene (PEO) as phase separation inducer and propylene oxide (POO) as gel accelerator. The results show that the pore size of porous materials prepared by foaming method is controlled, most of them are closed pores, and the production process is simple, and the flotation tailings of magnesite are the main raw materials. Compared with foaming method, the structure of porous magnesium oxide prepared by sol-gel method is more loose, and the matrix toughness is enhanced by the formation of gel skeleton, and three dimensional network through pores are formed after sintering. The pore size is fine and uniform, and the pore size is nanometer, in addition, the samples are all periclase phase.
【作者单位】：东北大学材料科学与工程学院;辽宁科技大学高温材料与镁资源工程学院;清华大学材料科学与工程系新型陶瓷与精细工艺国家重点实验室;
【分类号】：TQ132.2

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