Élaboration et caractérisation de superalliages base chrome pour utilisation lors du fibrage centrifuge du verre à très haute température

Abstract : The TEL process is used to produce glass wool at very high temperature. The main piece of this process is the “spinner”, which is exposed, in service, to numerous operating constraints (oxidation, corrosion, erosion and creep). This spinner is currently made of cobalt- or nickel-based superalloys and is fabricated by casting. To fiberize new glasses or to increase the current maximal fiberizing temperature, a new type of superalloy is required. Chromium is an ideal candidate to be the principal element of a new superalloy because of its very high melting point and its ability to develop a chromia protective scale against oxidation and corrosion at high temperature, reason for which it is usually added to many classical superalloys. During this Ph.D work, the synthesis and the study of more than a hundred of chromium-based alloys with different chemical compositions was done by casting. These alloys are brittle at room temperature during their cutting. Laboratory tests of hardness at room temperature, oxidation and 3 points flexural creep at high temperature were performed. Metallographic characterisations were carried out (XRD, SEM, EPMA) on all alloys in their as-cast state, after isothermal annealing or isothermal oxidation. The detailed study of simple alloys permitted to discover some compositions removing the brittleness problem of these alloys. Then, the enrichment of the composition of the alloys by addition of new elements, allowed to correct some inherent problems of chromium-based alloys.
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https://hal.univ-lorraine.fr/tel-01752398
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Submitted on : Thursday, March 29, 2018 - 1:44:54 PM
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  • HAL Id : tel-01752398, version 1

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Elodie Conrath. Élaboration et caractérisation de superalliages base chrome pour utilisation lors du fibrage centrifuge du verre à très haute température. Alimentation et Nutrition. Université de Lorraine, 2016. Français. ⟨NNT : 2016LORR0018⟩. ⟨tel-01752398⟩

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