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|title: ||Using phase diagrams to deal with moisture expansion|
|authors: ||Segadães, Ana M.|
Carvalho, M. Arlete
Ferreira, Heber C.
|keywords: ||Lifetime (Moisture expansion)|
|issue date: ||2003|
|abstract: ||Consensus has it that the post-fabrication moisture expansion of fired clay-based materials is governed by the presence of amorphous and/or vitreous phases. In this work, very simple calculations using the lever rule and the phase diagram of the Al2O3-SiO2-K2O (A-S-K) system, were used to show that the experimentally observed dependencies between moisture expansion and the A/S and K/A weight ratios in clay-based compositions can be correlated with the amount of liquid phase formed during the initial melting of the composition, which remains in the fired body as a vitreous phase. This correlation might, if judiciously used, help ceramists in the choice of additives and/or processing conditions, while avoiding changes in the firing temperatures. Also, the results obtained throw a sharper light in the dual and, in this respect, antagonistic role played by the liquid phase during firing. (C) 2003 Elsevier Ltd and Techna S.r.l. All rights reserved.|
|publisher version/DOI: ||http://dx.doi.org/10.1016/S0272-8842(03)00051-8|
|source: ||Ceramics International|
|appears in collections||CV - Artigos|
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