Highly porous Y2SiO5 ceramic with extremely low thermal conductivity prepared by foam‐gelcasting‐freeze drying method |
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Authors: | Zhen Wu Luchao Sun Jingjing Pan Jingyang Wang |
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Affiliation: | High‐Performance Ceramics Division, Shenyang National Laboratory for Materials Science, Institute of Metal Research, CAS, Shenyang, China |
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Abstract: | Foam‐gelcasting‐freeze drying method is developed to fabricate porous Y2SiO5 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/cm3, 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. |
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Keywords: | gelcasting porous materials processing thermal properties |
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