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Preparation of magnesia porous material using foaming method and sol-gel method

Li Meiting;Luo Xudong;Zhang Guodong;Xie Zhipeng;Li Jiguang;Du Jian;School of Material Science and Engineering,Northeastern University;School of High Temperature Materials and Magnesium Resource Engineering,Liaoning University of Science and Technology;State Key Lab of New Ceramics and Fine Processing,School of Materials Science and Engineering,Tsinghua University;  
The composition,structure,and property of magnesia porous materials prepared by foaming method and sol-gel method were compared and analyzed.Magnesia porous material by foaming method was prepared with main raw materials including flotation tailing of magnesite and fused magnesia as well as additives involving hexametaphosphate,sodium citrate and α-Al2O3 powder.The slurry of magnesia porous material was prepared with sodium dodecyl sulfate(SDS) as blowing agent and dextrin as foam stabilizer,and magnesia porous materials were produced through the processes,including slip casting,curing,drying,and sintering.Magnesia porous material prepared by sol-gel method was accompanied by phase separation with Mg Cl2·6H2O as a precursor,poly(ethylene oxide)(PEO) as a phase separation inducer and propylene oxide(PO) as a gelation agent.Then magnesia porous materials were prepared by ageing,drying,and sintering processes.Results showed that the pore size of porous material could be controlled via foaming method,pores were mostly closed,and the way of production process was simple.While using magnesite flotation tailings as the main raw material can greatly reduce the cost of production and achieve sustainable development of resources.Compared with foaming method,the structure of Mg O porous materials via sol-gel method was loose,gel skeletons enhanced the matrix toughness,three-dimensional network through-hole was formed after sintering,and the pore diameter small,uniform and mostly nanoscale.Besides,the crystalline composition of specimens after sintering was all comprised of periclase.
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