Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 37, Issue 16, Pages 5259-5264Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2017.05.001
Keywords
Porous silica ceramic; Diatomite; Freeze-casting; Thermal conductivity
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Diatomite-derived porous silica ceramics with high porosities of up to 90% were fabricated using a gelation-freezing method, which resulted in unidirectional cellular or random microstructure with micrometer-sized cells. The ice crystals that were formed during freezing of a diatomite powder dispersed gel were removed by sublimation during vacuum drying, and the green bodies were sintered at 1150-1350 degrees C for 2 h in air. The thermal conductivity of the porous ceramics prepared with initial solid loadings of 5 and 10 vol% ranged from 0.09 to 0.16 W/(mK) at room temperature. The proposed method is therefore promising for the preparation of ceramic thermal insulators with very low thermal conductivity. (C) 2017 Elsevier Ltd. All rights reserved.
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