Improved Heat Insulation and Mechanical Properties of Highly Porous YSZ Ceramics After Silica Aerogels Impregnation

被引：31

作者：

Li, Sa ^{[1
]}

Wang, Chang-An ^{[1
]}

Hu, Liangfa ^{[1
]}

机构：

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

来源：

JOURNAL OF THE AMERICAN CERAMIC SOCIETY | 2013年 / 96卷 / 10期

基金：

中国国家自然科学基金;

关键词：

LOW THERMAL-CONDUCTIVITY; PORE-SIZE; COMPOSITE; ADSORPTION; STRENGTH; POROSITY;

D O I：

10.1111/jace.12564

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：

To further improve heat insulation and mechanical properties, silica aerogels were impregnated into highly porous yttria-stabilized zirconia (YSZ) ceramics with well-distributed pores fabricated by tert-butyl alcohol -based gel-casting process and pressureless sintering. Pore size distribution, room-temperature thermal conductivities, and compressive strength of the YSZ ceramics before and after impregnation with silica aerogels were examined and compared, respectively. After impregnating porous YSZ ceramics with silica aerogels, the porosity displayed a little decrease, whereas the pore size significantly decreased by one order of magnitude. Based on this microstructure development, the room-temperature thermal conductivities were significantly lowered and the compressive strength was also promoted. Therefore, the heat insulation and mechanical properties could be simultaneously improved by impregnating porous ceramics with silica aerogels.

引用

页码：3223 / 3227

页数：5

共 28 条

[1] Modelling of thermal conductivity of porous materials:: application to thick thermal barrier coatings [J].