Published March 18, 1991 | Version v1
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Thermo-kinetic study of the dissolution of a solid metal in a liquid metallic matrix

Creators

Description

Within the frame of the thermodynamic study of alloys by direct reaction calorimetry, this research thesis reports the analysis of mechanisms and kinetics, on the one hand, of the attack of solid metal A by an element B in vapour phase, and on the other hand, the dissolution of this metal in an A-B alloy. Thermograms are deconvolutioned and lead to the real thermo-genesis of phenomena. This method is applied to the Ag-Te system. The author reports the transient formation of Ag-2Te acting as a protective layer which slows down silver dissolution. Kinetics of appearance and dissolution of this compound has been studied for a wide range of experimental conditions. A model based on diffusion processes is developed which describes the evolution of concentration fields in time. It allows the prediction of conditions of existence of the compound intermediate layer, and therefore leads to kinetic laws of the dissolution phenomenon

Abstract (French)

Dans le cadre de l'etude thermodynamique des alliages par calorimetrie de reaction directe le memoire analyse les mecanismes et la cinetique, d'une part de l'attaque d'un metal solide A par un element B en phase vapeur, d'autre part la dissolution de ce metal dans un alliage liquide A-B. Les thermogrammes obtenus sont deconvolues numeriquement et conduisent a la thermogenese reelle des phenomenes. La methode a ete appliquee au systeme Ag-Te en fonction de la temperature et de la concentration. Dans le cas des reactions solide-vapeur, la methode permet sous certaines conditions la determination des limites de phases du systeme a une temperature en une seule experience. Elle peut conduire a l'estimation du coefficient de diffusion des vapeurs B dans un gaz inerte (argon). En ce qui concerne la dissolution de l'argent dans son alliage liquide avec le tellure, la formation transitoire du compose Ag2Te agissant comme couche protectrice ralentissant la dissolution de l'argent a ete mise en evidence. Les cinetiques d'apparition et de dissolution de ce compose ont ete etudiees pour une gamme etendue de conditions experimentales. Enfin, un modele base sur les processus de diffusion a ete mis au point. Il decrit l'evolution des champs de concentration en fonction du temps, permet de prevoir les conditions d'existence de la couche intermediaire de compose et conduit ainsi aux lois cinetiques du phenomene de dissolution. (auteur)

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Additional details

Additional titles

Original title (French)
Etude thermocinetique de la dissolution d'un metal solide dans une matrice metallique liquide

Identifiers

URL
http://www.iaea.org/inis/contacts/;

Publishing Information

Imprint Pagination
135 p.
Report number
FRNC-TH--8419

INIS

Country of Publication
France
Country of Input or Organization
France
INIS RN
44067418
Subject category
S36: MATERIALS SCIENCE;
Resource subtype / Literary indicator
Thesis
Descriptors DEI
BINARY ALLOY SYSTEMS; CALORIMETRY; CHEMICAL COMPOSITION; CORROSION; DISSOLUTION; ENTHALPY; LIQUIDS; MATHEMATICAL MODELS; REACTION KINETICS; SILVER; SILVER ALLOYS; SOLIDS; TELLURIUM; TELLURIUM ALLOYS; TEMPERATURE DEPENDENCE
Descriptors DEC
ALLOY SYSTEMS; ALLOYS; CHEMICAL REACTIONS; ELEMENTS; FLUIDS; KINETICS; METALS; PHYSICAL PROPERTIES; SEMIMETALS; THERMODYNAMIC PROPERTIES; TRANSITION ELEMENT ALLOYS; TRANSITION ELEMENTS

Optional Information

Notes
47 refs.; Available from the INIS Liaison Officer for France, see the 'INIS contacts' section of the INIS website for current contact and E-mail addresses: http://www.iaea.org/inis/contacts/