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赵菁,徐瀚川,茹红强,袁志刚.凝胶辅助发泡法制备三维互联多孔SiC陶瓷[J].稀有金属材料与工程(英文),2020,49(2):618~622.[Zhao Jing,Xu Hanchuan,Ru Hongqiang and Yuan Zhigang.Fabrication of 3D interconnected porous SiC by gel-assisted foaming method[J].Rare Metal Materials and Engineering,2020,49(2):618~622.]
Fabrication of 3D interconnected porous SiC by gel-assisted foaming method
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Received:March 28, 2019  Revised:May 08, 2019
Key words: 3D interconnected porous SiC  stirring-foaming  freeze-gelcasting  porosity
Foundation item:国家自然科学基金资助(项目号51772048),沈阳理工大学引进高层次人才科研支持计划(项目号105000100032)
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Zhao Jing,Xu Hanchuan,Ru Hongqiang and Yuan Zhigang  
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      In this work, three dimensional interconnected porous SiC ceramics were prepared via combining stirring-foaming and freeze-gelcasting. The obtained porous ceramics with tunable porous structure, uniform pore size distribution and multiply porous structure were fabricated successfully. The effect of PVA and stirring speed on porous structure and properties of SiC porous ceramics were investigated.The results showed that porous structure uniformity could be tuned by varying ω(PVA)/ω(SiC) , and until optimum when the values was 1.5. The porosity increased, 1st mode pore size and pore wall thickness decreased with the increasing of PVA content. The porous structure could be improved by increasing stirring speed. When stirring speed was 1600 r/min, the porosity and compressive strength were 88.42 % and 4.36 MPa, respectively.