Journal of Northeastern University ›› 2013, Vol. 34 ›› Issue (7): 939-942.DOI: -

• Materials & Metallurgy • Previous Articles     Next Articles

Fabrication of Al2O3Based Porous Ceramic with Closed Pores by Superplastic HighTemperature Foaming Method

YUAN Lei, HE Zhenbao, YU Jingkun   

  1. School of Materials & Metallurgy, Northeastern University, Shenyang 110819, China.
  • Received:2013-01-28 Revised:2013-01-28 Online:2013-07-15 Published:2013-12-31
  • Contact: YU Jingkun
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Abstract: Al2O3based porous ceramic with closed pores was fabricated utilizing the superplastic deformation properties of Al2O3based ceramics with nano and submicron Al2O3 powder as raw materials, MgO as the dopant and SiC as the hightemperature foaming agent. The effects of different particle size of Al2O3 and different amounts of MgO on the apparent porosity, closed porosity and microstructure of Al2O3based porous ceramic were studied. The phase composition of Al2O3based porous ceramic was also investigated, and the mechanism of forming closed pores in the sintering process of Al2O3based porous ceramics was discussed. The results indicated that the apparent porosity of Al2O3based porous ceramics fabricated with nano Al2O3 powder was lower than that formed with submicron Al2O3. The apparent and closed porosity were 13% and 132%, respectively, and the diameter of the closed pores was about 1~2μm. The phases in the porous ceramic were Al2O3 and MgAl2O4, which generated by the completely reaction between Al2O3 and MgO in the billet.

Key words: closed pores, porous ceramics, Al2O3, superplasticity, hightemperature foaming

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