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Highly porous Y 2 SiO 5 ceramic with extremely low thermal conductivity prepared by foam‐gelcasting‐freeze drying method
Author(s) -
Wu Zhen,
Sun Luchao,
Pan Jingjing,
Wang Jingyang
Publication year - 2018
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.15330
Subject(s) - materials science , porosity , thermal conductivity , composite material , shrinkage , ceramic
Foam‐gelcasting‐freeze drying method is developed to fabricate porous Y 2 SiO 5 ceramic with ultrahigh porosity of 92.2%‐95.8% and isotropous multiple pore structures. As prepared porous samples have quite low shrinkages of 0.8%‐1.9% during demolding and drying processes, lightweights of 0.19‐0.35 g/cm 3 , and extremely low thermal conductivities of 0.054‐0.089 W·(m·K) −1 . Our approach combines the merits of foam‐gelcasting method and freeze drying method. It is a simple and effective method to fabricate porous ceramics with very high porosity and extremely low thermal conductivity through low shrinkage of green body and near net complex shape forming.