Improving the properties of ceramic foams by a vacuum infiltration process

被引:104
|
作者
Vogt, U. F. [1 ,3 ]
Gorbar, M. [1 ]
Dimopoulos-Eggenschwiler, P. [2 ]
Broenstrup, A. [5 ]
Wagner, G.
Colombo, P. [4 ]
机构
[1] Empa, Swiss Fed Labs Mat Sci & Technol, Lab Hydrogen & Energy, CH-8600 Dubendorf, Switzerland
[2] Empa, Swiss Fed Labs Mat Sci & Technol, Lab IC Engines, CH-8600 Dubendorf, Switzerland
[3] Univ Freiburg, Dept Crystallog, D-79104 Freiburg, Germany
[4] Univ Padua, Dipartimento Ingn Meccan, I-35131 Padua, Italy
[5] Johnson Matthey Catalysts GmbH, D-96257 Redwitz, Germany
关键词
Al2O3; ZTA; Reticulated foams; Vacuum infiltration; Strength; RETICULATED POROUS CERAMICS; CATALYST SUPPORTS; ALUMINA; ZIRCONIA; STRENGTH; BEHAVIOR;
D O I
10.1016/j.jeurceramsoc.2010.06.003
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
Reticulated ceramic foams are widely used for industrial applications such as metal filtration, exhaust gas and air purification, catalyst support and others. In this work, the compression strength and specific surface area of reticulated foams have been improved, while at the same time maintaining a high level of permeability in the final foam structure. In particular, a vacuum infiltration step by using a suitable slurry, followed by a pre-sintering cycle was adopted for filling up the hollow struts, generated due to the burnout of the PU foam. Furthermore, various mixtures of fine and coarse-grained alumina as well as in combination with zirconia, were utilised with the aim of controlling the foam properties such as compression strength, specific surface area and permeability. The compression strength was improved by a factor of two for alumina foams by infiltrating the hollow struts, and by a factor of four when infiltrating the struts of ZTA foams, with the composition 70 mol% Al2O3 and 30 mol% ZrO2. The weight gain resulting from the vacuum infiltration process was in the order of 10 wt%. (C) 2010 Elsevier Ltd. All rights reserved.
引用
收藏
页码:3005 / 3011
页数:7
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