Control of pore channel size during freeze casting of porous YSZ ceramics with unidirectionally aligned channels using different freezing temperatures

被引：150

作者：

Hu, Liangfa ^{[1
]}

Wang, Chang-An ^{[1
]}

Huang, Yong ^{[1
]}

Sun, Chencheng ^{[2
]}

Lu, Sheng ^{[2
]}

Hu, Zijun ^{[2
]}

机构：

[1] Tsinghua Univ, Dept Mat Sci & Engn, State Key Lab New Ceram & Fine Proc, Beijing 100084, Peoples R China

[2] Aerosp Res Inst Mat & Proc Technol, Natl Key Lab Adv Funct Composite Mat, Beijing 100076, Peoples R China

来源：

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2010年 / 30卷 / 16期

基金：

中国国家自然科学基金;

关键词：

Freezing casting; Porosity; Thermal conductivity; Yttria-stabilized zirconia; Insulators; THERMAL-CONDUCTIVITY; SILICON-NITRIDE; BUTYL ALCOHOL; ALUMINA; 2-METHYL-2-PROPANOL; HYDROXYAPATITE; COATINGS;

D O I：

10.1016/j.jeurceramsoc.2010.07.032

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Porous yttria-stabilized zirconia (YSZ) ceramics with unidirectionally aligned pore channels were prepared by freezing YSZ/tert-butyl alcohol (TBA) slurry under different freezing temperatures of -30, -78 and -196 degrees C, respectively. After removing the frozen TBA via freeze-drying in vacuum at -50 degrees C, the green samples were sintered at 1450 degrees C for 2h in air. The results showed that the freezing temperature significantly influenced microstructure and properties of the porous YSZ ceramics. Both microstructure observation and pore size distribution indicated that the pore channel size decreased significantly with decreasing freezing temperature, regardless of microstructure variations in the individual sample. Both porosity and room-temperature thermal conductivity of the porous YSZ ceramics varied under different freezing temperatures. Regardless of microstructure variations in the samples under different freezing temperatures, all samples had unidirectional pore channels with increasing pore channel size along the freezing direction. The fabricated samples had remarkably low thermal conductivities both in directions perpendicular and parallel to the channel direction, thus rendering them suitable for applications in thermal insulations. (c) 2010 Elsevier Ltd. All rights reserved.

引用

页码：3389 / 3396

页数：8

共 23 条

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