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Thermodynamic Factors Governing Interfacial Chemistry And Wetting In Binary Alloy-Refractory Oxide Systems.

Published online by Cambridge University Press:  25 February 2011

Merlin V. ,
Kritsalis P. ,
Coudurier L.  and
Eustathopoulos N.
Merlin V.
Affiliation:
L.T.P.C.M., URA. 29. I.N.P.G.. D.U., ENSEEG, Bp. 75 38402 Saint Martin d'Hères Cedex, France.
Kritsalis P.
Affiliation:
L.T.P.C.M., URA. 29. I.N.P.G.. D.U., ENSEEG, Bp. 75 38402 Saint Martin d'Hères Cedex, France.
Coudurier L.
Affiliation:
L.T.P.C.M., URA. 29. I.N.P.G.. D.U., ENSEEG, Bp. 75 38402 Saint Martin d'Hères Cedex, France.
Eustathopoulos N.
Affiliation:
L.T.P.C.M., URA. 29. I.N.P.G.. D.U., ENSEEG, Bp. 75 38402 Saint Martin d'Hères Cedex, France.
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Abstract

For a given non-reactive metal M- refractory oxide system, the influence of a metallic solute A on interfacial chemistry and wetting depends mainly on the value of εO−A the Wagner interaction parameter which quantifies the solute A-solute oxygen interactions in the liquid matrix M.

For εO−A < 0 (moderate attraction between solutes A and O) additions of A in M enhance dissolution of oxide in the liquid alloy, thereby increasing the dissolved oxygen content. The O-A clusters formed are adsorbed at the metal-oxide interface leading to an increase in both wettability and adhesion energy. For εO−A ≪0 (strong A-O interactions), solute A can also form an oxide by reduction of the substrate. The more metallic in character this oxide is, the more wettable it will be by molten metal.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 238: Symposium Cb – Structure and Properties of Interfaces in Materials , 1991 , 511
Copyright
Copyright © Materials Research Society 1992

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References

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