期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 31, 期 15, 页码 2915-2922出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2011.07.014
关键词
ZrO2; Porosity; Thermal conductivity; Insulators
资金
- National Natural Science Foundation of China [90816019]
- Natural High Technology Research and Development Program of China (863 Program) [2007AA03Z435]
- State Key Development Program of Basic Research of China (973 program) [2006CB605207-2]
The previous report of this work has demonstrated the fabrication and properties of porous yttria-stabilized zirconia (YSZ) ceramics with unidirectionally aligned pore channels. As a follow-up study, the present work aims at lowering the thermal conductivity of the porous YSZ ceramics by silica aerogels impregnation. The porous YSZ ceramics were immersed in an about-to-gel silica sol. Both the unidirectionally aligned pore channels and the inter-grain pores by grain stacking in the channel-pore wall of the porous YSZ ceramics were impregnated with the silica sol. After aging and supercritical drying, silica aerogels formed in the macroporous network of the porous YSZ ceramics with unidirectionally aligned pore channels. The influences of silica acrogel impregnation on the microstructure and properties of porous YSZ ceramics with unidirectional aligned pore channels were investigated. The porosity decreased after impregnation with silica aerogels. Both microstructure observation and pore size distribution indicated that both channel-pore size and inter-grain pore-size decreased significantly after impregnation with silica aerogels. Impregnating porous YSZ ceramics with silica aerogels remarkably lowered the room-temperature thermal conductivity and enhanced the compressive strength. The as-fabricated materials are thus suitable for applications in bulk thermal isolators. (C) 2011 Elsevier Ltd. All rights reserved.
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