Les alliages à base de plomb pour batteries acides : A) Etude thermodynamique des alliages PbCaSn ; B) Optimisation d'un nouveau procédé d'élaboration des grilles d'électrodes par métallurgie des poudres

Abstract : Lead calcium tin alloys are extremely used as electrodes in acid batteries. They are structural hardening alloys, synthesized by casting/hardening and subject to microstructural evolution during use. The change from an "aged" metallurgic structure to an "over-aged" structure is associated, in particular, with a decrease of mechanical properties. The aged state can be stabilized with an optimization of the structural hardening process. The thermodynamic modeling of the PbCaSn system has been performed according to the CALPHAD approach in order to appreciate the oversaturation degree after casting and to optimize the necessary thermal treatment to obtain the stabilization of the aged state. A new elaboration process has been developed. It is based on Pb/TiO2 composite synthesis by hot compaction (sintering). Even if the electrochemical properties are not optimized, mechanical properties are improved in comparison with PbCaSn alloys synthesized by die casting and stabilized in aged state.
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Yohann Cartigny. Les alliages à base de plomb pour batteries acides : A) Etude thermodynamique des alliages PbCaSn ; B) Optimisation d'un nouveau procédé d'élaboration des grilles d'électrodes par métallurgie des poudres. Autre. Université Henri Poincaré - Nancy 1, 2004. Français. ⟨NNT : 2004NAN10181⟩. ⟨tel-01747496⟩

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