ISSN:
0142-2421
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Physics
Notes:
Two types of catalytic ceramic coating for steam reforming were adhered to the surface of an Ni-based alloy, Inconel 600, by sintering at high temperatures (1000°C) in atmospheric air. The interfaces were subsequently investiagated with AES, SAM and depth profiling after being submitted to a direct-pull test to obtain a measure of the adhesion strength. It was found that the adhesion of the Mg-rich coating was caused mainly by diffusion of Mg from the ceramic into the Cr2O3 scale of the metal substrate. After reduction in H2 (activation of the Ni catalyst), a substantial drop in the adhesion strength was found. This was caused by metallization of Ni-rich islands in the interface zone formed on the metal during sintering. These findings suggest that firing temperature with lower oxygen partial pressure (during sintering) will lead to a more stable adhesion strength. The other, Al-rich coating had a much weaker adhesion strength compared to the Mg-rich coating.
Additional Material:
6 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/sia.740231107
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