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Etude du fluage de réfractaires électrofondus du système alumine-zircone-silice

Abstract : This study has been carried out owing to the French research program PROMETHEREF, which aims to improve the knowledge of thermal and mechanical properties of industrial refractories at high temperature. The work is focussed on the study of two fused cast refractory: an alumina-zirconia-silica product (AZS) and a very high zirconia content product (HZ), produced by Saint-Gobain for the glass manufacturing industry. The aim of this thesis is to characterize and to propose constitutive equations defining the creep behaviour of these materials to be able to model their annealing during their manufacture. In order to identify the mechanical behaviour law from uniform stress states, high temperature compression and tension jigs have been especially developed and extensively used at Materials Centre. The modular concept allows to pass through a solicitation mode to the other only by the changing of loading system. Its originality comes from the tension system where the use of an inversed loading allows to avoid specimen fixing system. Thanks to this device, we built an experimental trial base of athermal and isothermal test to find the mechanisms of deformation and model the mechanical behaviour of these materials. These attempts reveal an asymmetrical behaviour in tension and in compression with, especially, an atypical creep behaviour of HZ material. A first approach of the creep law was tempted from an asymmetrical law with kinematic hardening. This approach turned out little decisive obliging us to reformulate it, not taking into account any more the asymmetry. So, the parameters of tension were identified for the material THTZ. The different simulation confirmed the presence of an asymmetry of behaviour, as well as the importance of the thermal history of materials on the mechanical behaviour.
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Submitted on : Thursday, May 31, 2007 - 12:13:51 PM
Last modification on : Thursday, September 24, 2020 - 6:30:06 PM
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  • HAL Id : tel-00150692, version 1

Citation

Ludovic Massard. Etude du fluage de réfractaires électrofondus du système alumine-zircone-silice. Mécanique [physics.med-ph]. École Nationale Supérieure des Mines de Paris, 2005. Français. ⟨tel-00150692⟩

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