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Fabrication of 3D interconnected porous SiC by gel-assisted foaming method
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1.School of Materials Science and Engineering,Shenyang Ligong University;2.Key Laboratory for Anisotropy and Texture of Materials of Ministry of Education ATM,Northeastern University

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    Abstract:

    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.

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[Zhao Jing, Xu Hanchuan, Ru Hongqiang, Yuan Zhigang. Fabrication of 3D interconnected porous SiC by gel-assisted foaming method[J]. Rare Metal Materials and Engineering,2020,49(2):618~622.]
DOI:10.12442/j. issn.1002-185X. QH20190044

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History
  • Received:March 28,2019
  • Revised:May 08,2019
  • Adopted:October 23,2019
  • Online: March 12,2020
  • Published: