High Temperature Material Processes (An International Quarterly of High-Technology Plasma Processes) An International Journal

ISSN for PRINT: 1093-3611

For Online Access

Best Paper Award Selection - Editorial Board Site

2002, Volume6

Issue 4

125 pages

Issue price - $144.00

A. Amadeh
Metallurgy and Materials Department, Faculty of Engineering, Tehran University P.O.Box 11365-4562, Tehran, Iran

J. C. Labbe
Faculte des Sciences et Techniques, L.M.C.T.S. - C.N.R.S. E.S.A. 6015 Universite de Limoges -123, av. Albert Thomas - 87065 LIMOGES Cedex, France

P. E. Quintard
Laboratoire de Science des Precedes Ceramiques et Traitements de Surface (S.P.C.T.S, UMR 6638 du CNRS); Institut Universitaire de Technologie du Limousin, Allee Andre Maurois F-87065 Limoges, France

The wettability and the corrosion of some AlN based or Al₂O₃ ceramics by a Si-Ca treated liquid steel were studied at 1550°C during one hour. All of the substrates exhibited a non-wetting behaviour. The evolution of the liquid-vapour and solid-liquid interfacial tensions and the work of adhesion show that wetting mechanism is governed by chemical interactions at the solid-liquid and liquid-vapour interfaces. The investigation of these interfaces with SEM and EDAX paint out that:
1) In the case of pure AlN, the corrosion of the substrate takes place by a decomposition of AlN and grain boundary attack.
2) In the case of an AlN-BN mixture, the corrosion is focused over the BN grains which are, from a thermodynamical point of view, less stable than AlN ones.
3) Carbon addition inhibits the corrosion of the substrate through its dissolution in the liquid phase that provides a reducing micro-atmosphere at the solid-liquid interface.
4) In the case of alumina, the corrosion is practically absent.

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