Abstract
Adhesion properties of washcoated γ-Al 2O 3 layer on FeCrAl metal foams were investigated. For comparison, planar FeCrAl foil was also investigated. Weight gain after washcoating was 19-20wt.% for FeCrAl foams without preoxidation. It was much higher than that of planar FeCrAl foils that went through preoxidation. Thermal shock test with 1000 cyclic heating and cooling up to 700°C showed that long term stability of washcoated γ-Al 2O 3 layer on FeCrAl foam was also good. Specific surface area of the γ-Al 2O 3 layer was reduced from 97 to 80m 2/g, but weight loss was very low and close to 0%. We attributed this superior thermal property of FeCrAl foam to minimal interfacial force built up by thermal stress at the interface of γ-Al 2O 3 layer and FeCrAl foam surface. Mechanical stress tests by ultrasonic in petroleum ether solution also showed very good robustness of washcoated γ-Al 2O 3 layer on FeCrAl foam against the stress with very low weight loss (less than 1%). Such excellent stabilities against thermal and mechanical stresses indicate that FeCrAl foam is a good candidate for catalyst supports under thermally and mechanically harsh environments.
Original language | English |
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Pages (from-to) | 169-176 |
Number of pages | 8 |
Journal | Surface and Coatings Technology |
Volume | 209 |
DOIs | |
Publication status | Published - 2012 Sept 25 |
Bibliographical note
Funding Information:This work was supported by a grant from the Fundamental R&D Program for Core Technology of Materials funded by the Ministry of Knowledge Economy, Republic of Korea and by a grant from the future R&D Program funded by Korea Institute of Science and Technology .
Keywords
- Adhesion
- FeCrAl
- Interfacial stress
- Metal foam
- Washcoat
ASJC Scopus subject areas
- General Chemistry
- Condensed Matter Physics
- Surfaces and Interfaces
- Surfaces, Coatings and Films
- Materials Chemistry