Iron/wustite/magnetite/alumina relationships in plasma coated steel: A TEM study

被引：14

作者：

Valette, S. ^{[1
]}

Trolliard, G. ^{[1
]}

Denoirjean, A. ^{[1
]}

Lefort, P. ^{[1
]}

机构：

[1] CNRS, UMR 6638, Sci & Procedes Ceram & Traitements Surface, F-87060 Limoges, France

来源：

SOLID STATE IONICS | 2007年 / 178卷 / 5-6期

关键词：

Transmission Electron Microscopy; plasma spraying; alumina coating; iron oxides; steel; adhesion;

D O I：

10.1016/j.ssi.2007.02.011

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Despite very low surface roughness values of steel substrates (Ra = 0.06 mu m), 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 cry stallographic continuity through the different heterophase interfaces present from the inner steel substrate up to the outer alumina coating: steel/iron (alpha-Fe)/wilstite (Fe1-xO)/magnetite (Fe3O4)/metastable alumina (gamma-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. (c) 2007 Elsevier B.V. All rights reserved.

引用

页码：429 / 437

页数：9

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