| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1298930 | Solid State Ionics | 2007 | 9 Pages |
Abstract
Despite very low surface roughness values of steel substrates (Ra = 0.06 μm), plasma sprayed coatings of Al2O3 exhibited an excellent adhesion (> 60 MPa) when the substrate was preliminary oxidized before coating.Investigation in the interfacial zone, mainly by TEM study, showed a crystallographic continuity through the different heterophase interfaces present from the inner steel substrate up to the outer alumina coating: steel/iron (α-Fe)/wüstite (Fe1−xO)/magnetite (Fe3O4)/metastable alumina (γ-Al2O3).No chemical reaction occurred between iron oxides and alumina, but strong crystallographic relationships linked every phase through the different interfaces.Such a structural continuity explained the solidity of this alloy/ceramic bonding.
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Authors
S. Valette, G. Trolliard, A. Denoirjean, P. Lefort,