METZ Renaud
Fonction : Maître de Conférences - Lyon 1 - UCBL
Organisme : Université Montpellier II
Maître de Conférences (HDR)
Directeur(trice) de thèse de :
MERINI H.,
DÉJEAN B.,
Autre(s) thème(s) de recherche ou rattachement(s) : - Matériaux fonctionnels carbonés renaud.metz
gmail.com
Bureau: , Etg: 3, Bât: 11 - Site : Campus Triolet
Administration Locale:- Responsable de formations
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| Curriculum Vitae: |
Maîtrise technique et environnementale de l'ensemble de la chaîne conduisant des matières premières au matériau et à sa fonction.
Financements industriels. |
Projets de Recherche: |
| Matériaux composites chargés de graphite nanométrique à gradient de champ électrique et à forte dissipation thermique. (Contrat Schneider Electric) |
Programme de Recherche/CV: |  |
Domaines de Recherche: - Sciences de l'environnement/Ingénierie de l'environnement
- Sciences de l'ingénieur/Matériaux
- Sciences de l'ingénieur/Energie électrique
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Dernieres productions scientifiques :
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Nonlinear field dependent conductivity dielectrics made of graphite nanoplatelets filled composites 
Auteur(s): Metz R. , Blanc C., Dominguez S., Tahir S., Le Parc R., Hassanzadeh M.
(Article) Publié:
Materials Letters, vol. 292 p.129611 (2021)
Ref HAL: hal-03245508_v1
DOI: 10.1016/j.matlet.2021.129611
WoS: WOS:000639094100055
Exporter : BibTex | endNote
Résumé: Downsizing electronic and electric equipment requires the optimization of electric field distributions in order to avoid localized dielectric breakdown (also called partial discharges). This paper presents a novel dielectric composite material aimed at grading electrical local surface stress. This functional material has a conductivity which increases by several orders with the applied electric field giving the ability to distribute the field by itself. It is prepared for the first time by dispersing graphite nanoplatelets in a polymer and may be used as a resistive or capacitive field grading material in electronic and electrical applications. Mechanisms at the origin of the nonlinear behavior are discussed.
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Study of the influence of nonlinear parameters on the efficiency of resistive field grading tube for cable termination
Auteur(s): Boucher Sarah, Chambard R., Hassanzadeh M., Castellon Jérôme, Metz R.
(Article) Publié:
Ieee Transactions On Dielectrics And Electrical Insulation, vol. p.2413 (2018)
Ref HAL: hal-01948521_v1
DOI: 10.1109/TDEI.2018.007329
WoS: 000452434500045
Exporter : BibTex | endNote
2 Citations
Résumé: The aim of this paper is to investigate the influence of nonlinear parameters (threshold field, low field conductivity and nonlinearity coefficient) on the performance of a cable termination equipped with a resistive field grading tube in 50 Hz and impulse voltage. The electrical field distribution over the insulator silicone housing surface was computed and analyzed using a finite element software (Flux 2D). Comparative studies between linear field grading (r = 2.9 and 16) and nonlinear resistive field grading (12 < r < 19) show that better effectiveness is achieved with a low threshold field and a high permittivity under 50 Hz and a high nonlinearity coefficient under impulse voltage.
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Matériau de répartition de champ électrique, son procédé de fabrication et dispositif comprenant un tel matériau
Auteur(s): Metz R., Hassanzadeh M.
Brevet: #EP 3 312 226 A1, (2018)
Ref HAL: hal-01940130_v1
Exporter : BibTex | endNote
Résumé: L'invention se rapporte à un matériau de répartition de champ électrique obtenu à partir dune formulation comprenant une matrice polymérique et une charge ou un mélange de charges conférant audit matériau une résistance électrique non linéaire.
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Recycling zinc oxide varistor blocks for electro-active silicone composites
Auteur(s): Metz R., Boudehen Loic, Tahir S., Phou T., Prevot G., Jelinek R., Dieudonne-George P., Hassanzadeh Merdad
(Article) Publié:
International Journal Of Applied Ceramic Technology, vol. 14 p.274-281 (2017)
Ref HAL: hal-01517065_v1
DOI: 10.1111/ijac.12637
WoS: WOS:000397509500020
Exporter : BibTex | endNote
1 Citation
Résumé: The recycling process toward the elimination of varistor wastes into new electro-active silicon composites has been investigated. We studied the dependence of the E-J characteristics on the aggregate content in the polymer matrix. Formulations with 40 vol.% metal oxide varistor aggregates in the 100-200m range exhibit reliable nonlinear behavior with a switching voltage of 280 +/- 30V/mm. The breakdown voltage of the composite decreases as both filler's diameter and filler's volume fraction increases in the 550-220V/mm and 440-280V/mm range, respectively. This paves the way for the valorization of varistors based zinc oxide (ZnO) ceramics.
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