Highly porous Y2SiO5 ceramic with extremely low thermal conductivity prepared by foam‐gelcasting‐freeze drying method. Issue 3 (20th November 2017)

• Record Type: Journal Article
• Authors: Wu, Zhen; Sun, Luchao; Pan, Jingjing; Wang, Jingyang
• Is Part Of: Journal of the American Ceramic Society. Volume 101:Issue 3(2018)
• Page Start: 1042
• Page End: 1047
• Publication Date: 2017-11-20
• Subjects: gelcasting -- porous materials -- processing -- thermal properties; Ceramics -- Periodicals; 620.1405
• DOI: 10.1111/jace.15330
• Languages: English
• ISSNs: 0002-7820

Abstract

Abstract: Foam‐gelcasting‐freeze drying method is developed to fabricate porous Y2 SiO5 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.