Porous alumina-spinel ceramics for high temperature applications


Autoria(s): SALOMAO, Rafael; BOAS, Mariana O. C. Villas; PANDOLFELLI, Victor C.
Contribuinte(s)

UNIVERSIDADE DE SÃO PAULO

Data(s)

18/10/2012

18/10/2012

2011

Resumo

In order to reduce energy costs, high-temperature insulation porous refractory ceramics have been subjected to increasing demands. Among the techniques used to produce these materials (such as the addition of foaming agents and organic compounds), the pore generation via phase transformation presents key aspects, such as easy processing and the absence of toxic volatiles. In this study, this technique was applied to produce porous ceramics by decomposing an aluminum magnesium hydro-carbonate known as hydrotalcite (Mg(6)Al(2)(CO(3))(OH)(16)center dot 4H(2)O). It was found out that by using this complex compound, a large fraction of pores can be generated and kept at high temperatures (above 1300 degrees C) due to the in situ formation of spinel-like phases (MgAl(2)O(4)). (C) 2011 Elsevier Ltd and Techna Group S.r.l. All rights reserved.

FAPESP

CNPq

Alcoa Aluminum (Brazil)

Identificador

CERAMICS INTERNATIONAL, v.37, n.4, p.1393-1399, 2011

0272-8842

http://producao.usp.br/handle/BDPI/18039

10.1016/j.ceramint.2011.01.012

http://dx.doi.org/10.1016/j.ceramint.2011.01.012

Idioma(s)

eng

Publicador

ELSEVIER SCI LTD

Relação

Ceramics International

Direitos

restrictedAccess

Copyright ELSEVIER SCI LTD

Palavras-Chave #Porous ceramics #Phase transformation #Hydrotalcite #Spinelization #STABILIZED WET FOAMS #MICROSTRUCTURE DEVELOPMENT #MACROPOROUS CERAMICS #TRANSITION ALUMINAS #SURFACE-AREA #DECOMPOSITION #Materials Science, Ceramics
Tipo

article

original article

publishedVersion