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Highly Porous Mullite Ceramics from Engineered Alkali Activated Suspensions
Journal of the American Ceramic Society ( IF 3.9 ) Pub Date : 2017-11-20 , DOI: 10.1111/jace.15327
Acacio Rincón Romero 1 , Hamada Elsayed 1, 2 , Enrico Bernardo 1
Affiliation  

Air may be easily incorporated by vigorous mechanical stirring, with the help of surfactants, of activated geopolymer-yielding suspensions. The cellular structure is stabilised by the viscosity increase caused by curing reactions, configuring an ‘inorganic gel casting’. The present paper is aimed at extending this approach to mullite foams, obtained by the thermal treatment of engineered alkali activated suspensions. ‘Green’ foams were first obtained by gel casting of a suspension for Na-geopolymer enriched with reactive γ-Al2O3 powders. Sodium was later extracted by ionic exchange with ammonium salts. In particular, the removal of Na+ ions was achieved by immersion in ammonium nitrate solution overnight, with retention of the cellular structure. Finally, the ion-exchanged foams were successfully converted into pure mullite foams by application of a firing treatment at 1300 °C, for 1 h. Preliminary results concerning the extension of the concept to mullite three-dimensional scaffolds are presented as well. This article is protected by copyright. All rights reserved.

中文翻译:

由工程碱活化悬浮液制成的高多孔莫来石陶瓷

在表面活性剂的帮助下,通过剧烈的机械搅拌,可以很容易地将空气掺入活化的地质聚合物产量悬浮液。蜂窝结构通过固化反应引起的粘度增加而稳定,构成“无机凝胶铸件”。本论文旨在将这种方法扩展到莫来石泡沫,该泡沫是通过对工程碱活化悬浮液进行热处理而获得的。“绿色”泡沫首先是通过凝胶浇注富含活性 γ-Al2O3 粉末的 Na-地质聚合物悬浮液获得的。后来通过与铵盐的离子交换来提取钠。特别是,通过在硝酸铵溶液中浸泡过夜来去除 Na+ 离子,同时保留细胞结构。最后,通过在 1300 °C 下进行 1 小时的烧制处理,离子交换泡沫成功转化为纯莫来石泡沫。还介绍了将该概念扩展到莫来石三维支架的初步结果。本文受版权保护。版权所有。
更新日期:2017-11-20
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