%0 Journal Article %A Amadeh, A. %A Labbe, J. C. %A Quintard, P. E. %D 2002 %I Begell House %N 4 %P 10 %R 10.1615/HighTempMatProc.v6.i4.10 %T WETTABELITY AND CORROSION OF SOME NITRIDE OR ALUMINA CERAMICS BY A Si-Ca TREATED LIQUID STEEL %U https://www.dl.begellhouse.com/journals/57d172397126f956,780a7e23068e0fb5,0c747c7e59ace690.html %V 6 %X 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. %8 2002-12-01