Obtaining and Characterization of Porous Bodies Obtained by Gelatinization

Abstract:

Porous ceramics have certain unique properties such as high toughness and resistance to heating at elevated temperatures. These properties make them products of great interest for applications on the field of filters and biomaterials. This paper proposes a new technique, called gelatinization, for processing this class of ceramics in order to obtain materials with more controlled pore size, plus a more homogeneous distribution. In order to check the efficiency of this technique, it was used as a raw material powders of calcined alumina and titania, previously characterized, mixed with unflavored gelatin, water and dispersant for holding the ceramic conformation. Three different formulations (with 40, 50 and 55% of solids content) were investigated using alumina and titania separately. The results indicated that the most suitable composition in terms of moldability was 55% of solids. It was also observed that the use of this technique to obtain bodies of high porosity is feasible; however, more detailed studies of sintering are necessary to obtain parts after firing in a close future. Due to the high porosity obtained the green, a detailed study of the sintering conditions is crucial to obtain parts with physical integrity.

• Periodical: Materials Science Forum (Volume 881)
• Pages: 64-68
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.881.64
• Online since: November 2016
• Authors: Ana Gabriela Storion, Sylma Carvalho Maestrelli, Eric Ramalho Pinto, Juliana Cristina de Freitas, Walter Aparecido Mariano, Lucas Caovila, Carolina del Roveri
• Keywords: Alumina, Gelatinization, Porosity, Titania

References

[1] A.G.S. Galdino: Mechanical and microstructural characterization of porous ceramics obtained from different aluminas. Mestrado (Dissertação). Fortaleza, 2003. Universidade Federal do Ceará (UFC). (CE).

DOI: 10.22239/2317-269x.01653

[2] P. Sepulveda: Am. Ceram. Soc. Bull. Vol. 76 (10) (1993), p.61.

[3] D. Liu: Ceramic International Vol. 24 (6) (1998), p.441.

[4] S. Kato et al.: Applied Catalysis B Environment Vol. 57 (2005), p.109.

[5] A. A. Picanço et al.: Water Science and Technology Vol. 44 (4) (2001), p.197.

[6] F.A. Almeida, F.C.L. Melo, G.P. Thim, Obtaining of porous ceramic from direct foaming technique with commercial starch. Proceedings of VIII ENCITA, São José dos Campos: ITA, 2013, p.259.

[7] R.P.S. Dutra, L.R.A. Pontes: Obtaining and analysis of porous ceramic with the incorporation of organic products to the ceramic body. 2002. Information on http: /www. scielo. br/scielo. php?script=sci_arttext&pid=S0366-69132002000400010.

[8] A.R. Passos: Preparation of porous alumina hierarchically structured. Mestrado (Dissertação). Araraquara, 2011. Universidade Estadual Paulista (UNESP). (SP).

[9] A. R Studart et al.: Journal of the American Ceramic Society Vol 89 (6) (2006), p.1771.