Aluminum Oxide Ceramics Obtained by Commercial Starch Consolidation with Gradient Porosity


Article Preview

The starch consolidation technique is commonly used for obtaining porous ceramics due to bonding and porous-maker starch characteristic during gelling process. The method adopted here improved the water drainage by using a plaster porous base (70 and 90 consistency values) improving the water drainage by action of gravity and the capillary effect. It used slip with 50 vol% solids and as precursors oxide A-1000SG and commercial cornstarch with a mass concentration varying from 10 to 40%. For comparison between the present method and the common one, slip was put in impermeable and permeable base moulds. The gelling occurred at 70°C for 2 hours and the drying at 110°C. Pre-sintering was carried out at 1000°C and the sintering at 1600°C with a plateau of 1 hour. Results showed that the plaster consistency of the mould bases was preponderant on ceramics porosity. Porosity and apparent density measurements using light and electron microscopy revealed variation of 5% of porosity from the top to the bottom of the samples.



Edited by:

Pietro VINCENZINI, Ralf RIEDEL, Alexander G. MERZHANOV and Chang-Chun GE




R. P. Mota et al., "Aluminum Oxide Ceramics Obtained by Commercial Starch Consolidation with Gradient Porosity", Advances in Science and Technology, Vol. 63, pp. 175-180, 2010

Online since:

October 2010




[1] O. Lyckfeldt, J.M.F. Ferreira: Processing of Porous Ceramics by Starch Consolidation. Journal of the European Ceramic Society Vol. 18 (1997) pp.131-140.


[2] R.S. Fernandes, E. de Campos, J. L. Minatti, J.A. Goes, R. P. Mota: Alumina Porous Ceramics: Mathematical Behavior at Different Commercial Starch Concentration Materials Science Forum Vol. 591-53 (2008), pp.442-447.


[3] A.F. Lemos, J.M.F. Ferreira: Porous bioactive calcium carbonate implants processed by starch consolidation Mat. Sci. Eng: C. Vol. 11 (2000) issue: 1, pp.35-40.


[4] F. Boschini, B. Guillaume, A. Rulmont, R. Cloots: Slip Casting of Barium Zirconate Aqueous Concentrated Suspensions J. Euro. Ceram. Soc. Vol. 26 (2006), pp.1591-1598.


[5] E. Gregorová, W. Pabst, I. Bohacenko: Characterization of different Starch Types for Their Application in Ceramic Processing J. Euro. Ceram. Soc. Vol. 26 (2006), pp.1301-1309.


[6] S. Mei, J. Yang, J.M.F. Ferreira: Comparasion of Dispersants Performance in Slip Casting of Cordierite-Based Glass-Ceramics Cer. Int. Vol. 29 (2003), pp.785-791.


[7] H.M. Alves, G. Tari, A.T. Fonseca, J.M.F. Ferreira: Processing of Porous Cordierite Bodies by Starch Consolidations. Research Bulletin Vol. 33 (1998) issue10, pp.1439-1448.


[8] J. Minatti, J. Santana, R. Fernandes; E. de Campos: Alumina developed by pre-gelling starch consolidation (PSC) J. Euro. Ceram Soc. Vol. 29 (2009), pp.661-668.


[9] J.S. Reed in: Introduction to the Principles of Ceramic Processing, John Wiley & Sons, NY (1988).

[10] E.M.X. Abreu, J.V. Barros, R.A.S. Ferreira, Y.P. Yadava, C.L. Silva, D.P.F. Souza in: Análise microestrutural do efeito de diferentes pós hemitratado no desempenho dos moldes de gesso, 47° Congresso Brasileiro de Cerâmica (2003).

[11] G.A. Zendom, D. Gouvêa, S.M. Toffoli in: Estudo Comparativo de Técnicas de Determinação de Porosidade de moldes de Gesso, 44º Congresso Brasileiro de Cerâmica (2000).


[12] V. Parameswaran, A. Shukla: Processing and Characterization of a Model Functionally Gradient Material J. Mat. Sci. Vol. 35 (2000), pp.21-29.