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Article dans une revue

Coupling additive manufacturing and microwave sintering: A fast processing route of alumina ceramics

Hugo Curto, Anthony Thuault, Florian Jean, Maxence Violier, Vedi Dupont, Jean-Christophe Hornez, Anne Leriche

In this paper, a quick and efficient route to produce complex-shape alumina is reported. Alumina pieces are shaped by additive manufacturing (stereolithography) and densified by microwave sintering. Two raw powders are investigated in terms of both printing and microwave sintering: one alumina…

Journal of the European Ceramic Society, 2020, 40 (7), pp.2548-2554. ⟨10.1016/j.jeurceramsoc.2019.11.009⟩. ⟨hal-03479272⟩

Thèse

Etude du traitement de poudres et influence des caractéristiques obtenues sur la transparence de céramiques du type spinelle, Study of powder processing and influence of the characteristics obtained on the transparency of spinel-type ceramics

Robin Stocky

Ce travail d’élaboration de céramique transparente pour la protection balistique s’inscrit dansun contexte d’allégement de structure et d’amélioration des propriétés optiques et mécaniques.Le remplacement de la face avant en verre par une céramique polycristalline, telle que lespinelle MgAl2O4…, This work aims to elaborate the benefits of transparent ceramics in ballistic protection systemswhich are employed by the military in their vehicles. The main focus lies on improving bothoptical and mechanical properties as well as reducing the weight of the system as a whole.Substituting the…

Mécanique des matériaux [physics.class-ph]. Université Polytechnique Hauts-de-France, 2020. Français. ⟨NNT : 2020UPHF0015⟩. ⟨tel-03202064⟩

Article dans une revue

Stability and asymptotic properties of a linearized hydrodynamic medium model for dispersive media in nanophotonics

Serge Nicaise, Claire Scheid

We analyze the stability of a linearized hydrodynamical model describing the response of nanometric dispersive metallic materials illuminated by optical light waves that is the situation occurring in nanoplasmonics. This model corresponds to the coupling between the Maxwell system and a PDE…

Computers & Mathematics with Applications, 2020, 79 (12), ⟨10.1016/j.camwa.2020.02.006⟩. ⟨hal-02276569⟩

Thèse

Couplage de la stéréolithographie et du frittage par micro-ondes pour l'élaboration rapide de pièces céramiques en alumine et zircone, Coupling of stereolithography and microwave sintering for the rapid processing of alumina and zirconia ceramic parts

Hugo Curto

Ce travail de thèse porte sur l’élaboration rapide de pièces céramiques de formes complexes. L’alumine, la zircone, et les composites alumine-zircone présentent un vaste champ d’applications allant de la joaillerie au biomédical en passant par des applications thermostructurales. Afin d’élaborer…, This thesis work focuses on the rapid processing of complex-shaped ceramic parts. Alumina, zirconia, and alumina-zirconia composites have a wide range of applications from jewellery to biomedical and thermostructural applications. In order to process parts quickly, stereolithography (SLA) as a…

Mécanique des matériaux [physics.class-ph]. Université Polytechnique Hauts-de-France, 2020. Français. ⟨NNT : 2020UPHF0016⟩. ⟨tel-03257452⟩

Communication dans un congrès

Etude expérimentale et modélisation thermomécanique du frittage de l'alumine, Experimental study and thermal mechanical modelling for alumina

Maxence Renaux, Damien Méresse, Julien Pellé, Céline Morin, Christian Courtois, Christelle Nivot, Anthony Thuault

Le frittage par micro-ondes permet de chauffer et de densifier les matériaux céramiques, comme l'alumine Al 2 O 3 , très rapidement (≤ 30min). Néanmoins les phénomènes mis en jeux sont encore mal compris, et les moyens de mesures ne permettent d'accéder qu'aux températures en surface…, Microwave sintering allows to heat and densify ceramic materials, like alumina Al2O3, very quickly (≤ 30min). However, the phenomena involved are still poorly understood, and the measurement techniques only allow access to the surface temperature. In order to predict the properties of the final…

28e Congrès Français de Thermique 2020, Jun 2020, Belfort, France. ⟨10.25855/SFT2020-009⟩. ⟨hal-03439420⟩

Article dans une revue

A transmission problem of a system of weakly coupled wave equations with Kelvin–Voigt dampings and non-smooth coefficient at the interface

Alaa Hayek, Serge Nicaise, Zaynab Salloum, Ali Wehbe

The purpose of this work is to investigate the stabilization of a system of weakly coupled wave equations with one or two locally internal Kelvin-Voigt damping and non-smooth coefficient at the interface. The main novelty in this paper is that the considered system is a coupled system and that the…

SeMA Journal: Boletin de la Sociedad Española de Matemática Aplicada, 2020, 77 (3), pp.305 - 338. ⟨10.1007/s40324-020-00218-x⟩. ⟨hal-04305136⟩

Article dans une revue

Existence and multiplicity for an elliptic problem with critical growth in the gradient and sign-changing coefficients

Colette De Coster, Antonio J. Fernández Sánchez

Let Ω ⊂ RN, N≥ 2 , be a smooth bounded domain. We consider the boundary value problem [Figure not available: see fulltext.]where cλ and h belong to Lq(Ω) for some q> N/ 2 , μ belongs to R\ { 0 } and we write cλ under the form cλ: = λc+- c- with c+≩ 0 , c-≥ 0 , c+c-≡ 0 and λ∈ R. Here cλ and h are…

Calculus of Variations and Partial Differential Equations, 2020, 59 (3), ⟨10.1007/s00526-020-01755-z⟩. ⟨hal-03337292⟩

Article dans une revue

3D printed bioceramic for phage therapy against bone nosocomial infections

Franck Bouchart, Olivier Vidal, Jean-Marie Lacroix, Corentin Spriet, Shaan Chamary, Annie Brutel, Jean-Christophe Hornez

This study provides a new therapeutic response to postoperative joint and bone infections. Alone or in combination with antibiotics, phage therapy has many advantages, including accurate targeting of pathogenic bacteria. In addition, a decrease in harmful side effects can improve the healing…

Materials Science and Engineering: C, 2020, 111, pp.110840. ⟨10.1016/j.msec.2020.110840⟩. ⟨hal-04279673⟩

Article dans une revue

Development of Ultrasonic Surface Acoustic Wave Humidity Sensors, Développement de Capteurs d’Humidité Ultrasonores à ondes Acoustiques de Surface

Saliou Ndao, Marc Duquennoy, Christian Courtois, Mohammadi Ouaftouh, Mohamed Rguiti, Nikolay Smagin, Frédéric Rivart, Maurice Gonon, Grégory Martic, Christine Pelegris, Frédéric Jenot

In a European project called CUBISM, humidity sensors based on IDT (Inter Digital Transducer) technology are developed for the generation and detection of surface acoustic waves (SAW). These sensors are designed to operate at high temperature (500°C) for monitoring the drying of refractory concrete…, Dans le cadre d’un projet européen nommé CUBISM, des capteurs d’humidité basés sur la technologie IDT (Inter Digital Transducer) pour la génération et la détection des ondes acoustiques de surface ou SAW (Surface Acoustic Wave) sont développés. Ces capteurs sont destinés à fonctionner à haute…

Instrumentation, Mesure, Métrologie, 2020, 19 (3), pp.205-210. ⟨10.18280/i2m.190305⟩. ⟨hal-03480302⟩

Article dans une revue

Phase transformations and microstructural evolution in nanocrystalline Fe 71 B 23 Nb 6 alloy prepared by mechanical alloying

Mahmoud Chemingui, Chahida Mnasri, Christelle Nivot, Arnaud Tricoteaux, Yannick Lorgouilloux, Mohamed Dammak

Abstract A new nanocrystalline Fe 71 B 23 Nb 6 alloy powder was prepared by mechanical alloying. The phase transformation and morphological and microstructural properties of the as-prepared alloy were investigated by scanning electron microscopy, laser granulometry, and X-ray diffraction with…

International Journal of Materials Research, 2020, 111 (4), pp.307-315. ⟨10.1515/ijmr-2020-1110406⟩. ⟨hal-04279070⟩