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 demoulding and drying processes, lightweights of 0.19–0.35 g/cm3, and extremely low thermal conductivities of 0.054–0.089 W/(m·K). 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. This article is protected by copyright. All rights reserved.

中文翻译：

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泡沫-凝胶注模-冷冻干燥法制备的极低导热率高多孔Y2 SiO5陶瓷

开发泡沫-凝胶注模-冷冻干燥法制备具有92.2-95.8%超高孔隙率和各向同性多孔结构的多孔Y2SiO5陶瓷。由于制备的多孔样品在脱模和干燥过程中具有 0.8-1.9% 的非常低的收缩率，0.19-0.35 g/cm3 的轻量化和 0.054-0.089 W/(m·K) 的极低热导率。我们的方法结合了泡沫凝胶浇注法和冷冻干燥法的优点。通过生坯的低收缩率和近净复杂形状成形，制备具有极高孔隙率和极低导热率的多孔陶瓷是一种简单而有效的方法。本文受版权保护。版权所有。