Fabrication of porous Al2O3 ceramics by rapid gelation and mechanical foaming


Porous Al2O3 ceramics were fabricated using a rapid gelation to fix the foam structure after mechanical foaming. The slurry was made with deionized water, Al2O3 powder, a water-soluble copolymer of isobutylene and maleic anhydride, and a surfactant. The resultant gel formed at room temperature in air. The influence of the surfactant (EMAL TD) content on gelling behavior, pore structure (porosity, cell size), shrinkage behavior, and compressive strength of the resultant porous Al2O3 ceramics was evaluated. Porous Al2O3 ceramics were sintered in only one step without debinding because of the low concentration of additives (≤0.5 wt%). The porous Al2O3 ceramics had porosities from 20 to 89% and cell sizes from 60 to 220 μm. The compressive strength was 75 MPa when the porosity was 60%.

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  1. 1.

    J.K. Park, J.S. Lee, and S.I. Lee: Preparation of porous cordierite using gelcasting method and its feasibility as a filter. J. Porous Mater. 9(3), 203–210 (2002).

    CAS  Article  Google Scholar 

  2. 2.

    J. Saggio-Woyansky, C.E. Scott, and W.P. Minnear: Processing of porous ceramics. Am. Ceram. Soc. Bull. 71(11), 1674–1682 (1992).

    CAS  Google Scholar 

  3. 3.

    H. Kim, S. Lee, Y. Han, and J.K. Park: Preparation of dip-coated TiO2 photocatalyst on ceramic foam pellets. J. Mater. Sci. 41(18), 6150–6153 (2006).

    CAS  Article  Google Scholar 

  4. 4.

    S. Furuta, H. Katsuki, and S. Komarneni: Modification of porous silica with activated carbon and its application for fixation of yeasts. J. Porous Mater. 8(1), 43–48 (2001).

    CAS  Article  Google Scholar 

  5. 5.

    L. Montanaro, Y. Jorand, G. Fantozzi, and A. Negro: Ceramic foams by powder processing. J. Eur. Ceram. Soc. 18(9), 1339–1350 (1998).

    CAS  Article  Google Scholar 

  6. 6.

    P. Sepulveda, F.S. Ortega, M.D.M. Innocentini, and V.C. Pandolfelli: Properties of highly porous hydroxyapatite obtained by the gelcasting of foams. J. Am. Ceram. Soc. 83(12), 3021–3024 (2000).

    CAS  Article  Google Scholar 

  7. 7.

    K.A. Hing: Bioceramic bone graft substitutes: Influence of porosity and chemistry. Int. J. Appl. Ceram. Technol. 2(3), 184–199 (2005).

    CAS  Article  Google Scholar 

  8. 8.

    X. Zhu, D. Jiang, and S. Tan: The control of slurry rheology in the processing of reticulated porous ceramics. Mater. Res. Bull. 37(3), 541–553 (2002).

    CAS  Article  Google Scholar 

  9. 9.

    Y.S. Kwon, G. Son, J. Suh, and K.T. Kim: Densification and grain-growth of porous alumina compacts. J. Am. Ceram. Soc. 77(12), 3137–3141 (1994).

    CAS  Article  Google Scholar 

  10. 10.

    S. Geis, J. Fricke, and P. Löbmann: Electrical properties of PZT aerogels. J. Euro. Ceram. Soc. 22(7), 1155–1161 (2002).

    CAS  Article  Google Scholar 

  11. 11.

    P. Sepulveda: Gelcasting foams for porous ceramics. Am. Ceram. Soc. Bull. 76(10), 61–65 (1997).

    CAS  Google Scholar 

  12. 12.

    P. Sepulveda and J.G.P. Binner: Processing of cellular ceramics by foaming and in situ polymerisation of organic monomers. J. Eur. Ceram. Soc. 19(12), 2057–2066 (1999).

    Article  Google Scholar 

  13. 13.

    O.O. Omatete, M.A. Janney, and R.A. Strehlow: Gelcasting–a new ceramic forming process. Am. Ceram. Soc. Bull. 70(10), 1641–1649 (1991).

    CAS  Google Scholar 

  14. 14.

    M. Takeshita and S. Kurita: Development of self-hardening slip casting. J. Eur. Ceram. Soc. 17, 415–419 (1997).

    CAS  Article  Google Scholar 

  15. 15.

    X.J. Mao, S.Z. Shimai, M.J. Dong, and S.W. Wang: Gelcasting of alumina using epoxy resin as a gelling agent. J. Am. Ceram. Soc. 90(3), 986–988 (2007).

    CAS  Article  Google Scholar 

  16. 16.

    H.X. Peng, Z. Fan, J.R.G. Evans, and J.J.C. Busfield: Microstructure of ceramic foams. J. Eur. Ceram. Soc. 20(7), 807–813 (2000).

    CAS  Article  Google Scholar 

  17. 17.

    Y. Yang, S.Z. Shimai, and S.W. Wang: Room temperature gelcasting of alumina with a water-soluble co-polymer. J. Mater. Res. doi: 10.1557/jmr.2013.132.

  18. 18.

    U.T. Gonzenbach, A.R. Studart, E. Tervoort, and L.J. Gauckler: Ultrastable particle-stabilized foams. Angew. Chem. Int. Ed. 45, 3526–3530 (2006).

    CAS  Article  Google Scholar 

  19. 19.

    K. Prabhakaran, A. Melkeri, N.M. Gokhale, and S.C. Sharma: Preparation of macroporous alumina ceramics using wheat particles as gelling and pore forming agent. Ceram. Int. 33(1), 77–81 (2007).

    CAS  Article  Google Scholar 

  20. 20.

    R. Brezny and D.J. Green: The effect of cell size on the mechanical behavior of cellular materials. Acta Metall. Mater. 38, 2517–2526 (1990).

    CAS  Article  Google Scholar 

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The authors would like to thank Kuraray Co. Ltd. and Kao Co. Ltd. of Japan for donating organic materials.

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Correspondence to Shiwei Wang.

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Yang, Y., Shimai, S., Sun, Y. et al. Fabrication of porous Al2O3 ceramics by rapid gelation and mechanical foaming. Journal of Materials Research 28, 2012–2016 (2013). https://doi.org/10.1557/jmr.2013.170

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