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Etude de la précipitation de l'oxyde d'argent en présence d'une charge solide dispersée

Abstract : The maste:ry of the silver oxide precipitation in the presence of a dispersed solid charge leading to powders with given properties for the manufacturing of composite electrical contact materials are the purposes of this thesis. To this end, we compare different options of material composition and manufacturing techniques. The silver oxide precipitation stands out because of wide composition ranges, flexibility and efficiency in dispersing the sol id charge. W e expose the subsequent operations necessary to endow the material with a usage shape. The mechanisms controlling the precipitate properties, that is to say nucleation, growth and aggregation are presented. The specifie properties and the physico-chemist:ry of silver oxide suspensions are studied in order to propose a model for the precipitation reaction. The rheological behaviour of the suspension as so the parti cie size distribution and structure are studied allowing to define the nature of the aggregates and the repartition of the charge. The electrical quality of sorne materials fabricated in batch or semi-batch reactors is controlled on wear machines in order to locate the relevant operating parameters. The electrical quality depends hardly on the alcali residual content in the material. For this reason, we have developed an original method for the determination of low sodium concentration values in composite silver materials. Investigations have also shown a link between thermal properties and electrical quality of the powder
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Submitted on : Thursday, March 29, 2018 - 1:38:38 PM
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  • HAL Id : tel-01752213, version 1



Richard Vivier. Etude de la précipitation de l'oxyde d'argent en présence d'une charge solide dispersée. Autre. Institut National Polytechnique de Lorraine, 2000. Français. ⟨NNT : 2000INPL027N⟩. ⟨tel-01752213⟩



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