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9 results on '"Laloo, Raphaël"'

1. Beyond surface nanoindentation: Combining static and dynamic nanoindentation to assess intrinsic mechanical properties of chemical vapor deposition amorphous silicon oxide (SiOx) and silicon oxycarbide (SiOxCy) thin films

Author

Puyo, Maxime, Topka, Konstantina Christina, Diallo, Babacar, Laloo, Raphaël, Genevois, Cécile, Florian, Pierre, Sauvage, Thierry, Samelor, Diane, Senocq, François, Vergnes, Hugues, Caussat, Brigitte, Menu, Marie-Joëlle, Pellerin, Nadia, Vahlas, Constantin, and Turq, Viviane

Published
2021
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5. Investigation of the mechanical properties of MnSi via EBSD-nanoindentation coupling and ab-initio calculation

Author

Mejri, Mahdi, Malard, Benoît, Thimont, Yohann, Connétable, Damien, Floquet, Pascal, Laloo, Raphaël, Proietti, Arnaud, Estournès, Claude, Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Institut National des Sciences Appliquées de Toulouse - INSA (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Centre interuniversitaire de recherche et d'ingenierie des matériaux (CIRIMAT), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT), Laboratoire de Génie Chimique (LGC), Université de Toulouse (UT)-Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Centre de microcaractérisation Raimond Castaing (Centre Castaing), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), and ANR-16-CE05-0012,RELIATEG,Générateurs thermoélectriques fiables(2016)

Subjects
Mn15Si26, Stiffness tensor, Matériaux, Mechanical Engineering, Metals and Alloys, High Manganese Silicide, [SPI.MAT]Engineering Sciences [physics]/Materials, [CHIM.GENI]Chemical Sciences/Chemical engineering, Mechanics of Materials, Nanohardness, Materials Chemistry, Génie chimique, Anisotropy, [SPI.GPROC]Engineering Sciences [physics]/Chemical and Process Engineering, Young’s modulus, Génie des procédés, Ab-initio calculation, Spark Plasma Sintering
Abstract

International audience; The goal of this study is to investigate the mechanical and elastic characteristics of the Mn15Si26 compound via experimental nanoindentation measurements and ab-initio calculations. The mechanical properties such as Young’s modulus (E) and nanohardness are important inputs for improving the design and mechanical reliability of thermoelectric modules. The high-energy X-ray diffraction pattern of Mn15Si26 has been indexed with the Miller indices of a tetragonal crystalline structure whose cell parameters are the following: a = b = 5.535(3) Å and c = 65.552(4) Å. Nanoindentation measurements, with a Berkovich indenter tip have been performed on higher manganese silicide (HMS) compound mainly composed of Mn15Si26 grains. For the first time ever, it has been evidenced that both elastic modulus and nanohardness of the latter varied significantly depending on their crystallographic orientations provided by electron backscatter diffraction. Nanohardness and Young’s modulus along the orientations are higher than the ones. The nanohardness value of Mn15Si26 ranges from 16 GPa to 20 GPa and the Young’s modulus measured varies between 234 GPa and 300 GPa. The stiffness tensor (Sij = (Cij)−1) of Mn15Si26 has been deduced from these experimental measurements as well as calculated using Ab-initio calculations. The macroscopic elastic modulus (E, G, Β) and Poisson's coefficient have been examined and discussed and their 3D-representation has been plotted. The mechanical anisotropy hereby evidenced as the existence of anisotropy of the thermoelectric properties could be a significant factor for the mechanical reliability of thermoelectric modules which consisted of Mn15Si26 legs with a possible preferred crystallographic orientation induced during their fabrication.

Published
2022

7. Multifunctional tribometer development and performance study of CuCrZr-316L material pair for ITER application

Author

Hillairet, Julien, Chen, Z.X., Turq, Viviane, Song, Y.T., Laloo, Raphaël, Vulliez, K., Bernard, J.M., Yang, Q.X., Hernandez, C., Ferreira, L., Fesquet, F., Lombard, G., Mollard, P., Volpe, R, Ferlay, Fabien, Larroque, S, Bruno, V, Hatchressian, J, Xu, H, Institut de Recherche sur la Fusion par confinement Magnétique (IRFM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Centre interuniversitaire de recherche et d'ingenierie des matériaux (CIRIMAT), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT), Institute of Plasma Physics, Chinese Academy of Sciences (ASIPP), Laboratoire d'Etanchéité (LE), European Organization for Nuclear Research (CERN), Institut de Recherche sur la Fusion par confinement Magnétique ( IRFM ), Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ), Centre de Physique des Particules de Marseille ( CPPM ), Centre National de la Recherche Scientifique ( CNRS ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Aix Marseille Université ( AMU ), Physics Department and Center for Interdisciplinary Research on Complex Systems, Northeastern University [Boston], Groupe NanoSciences ( CEMES-GNS ), Centre d'élaboration de matériaux et d'études structurales ( CEMES ), Institut National des Sciences Appliquées - Toulouse ( INSA Toulouse ), Institut National des Sciences Appliquées ( INSA ) -Institut National des Sciences Appliquées ( INSA ) -Centre National de la Recherche Scientifique ( CNRS ) -Université Toulouse III - Paul Sabatier ( UPS ), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National des Sciences Appliquées - Toulouse ( INSA Toulouse ), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées, Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC), Commissariat à l'Energie Atomique et aux énergies alternatives - CEA (FRANCE), Centre National de la Recherche Scientifique - CNRS (FRANCE), Chinese Academy of Sciences (CHINA), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Laboratoire d'étanchéité Maestral (Pierrelatte, France), and Institut National Polytechnique de Toulouse - INPT (FRANCE)

Subjects
Cracking, Thermonuclear fusion, Materials science, Vacuum, Nuclear engineering, Matériaux, Ultra-high vacuum, Thermal stress, 02 engineering and technology, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, 010305 fluids & plasmas, [SPI.MAT]Engineering Sciences [physics]/Materials, Hardness, 0103 physical sciences, Rh coating, Electronic engineering, Physique Nucléaire Expérimentale, Tribometer, Mechanical Engineering, Contact resistance, RF contact, Surfaces and Interfaces, [ PHYS.PHYS.PHYS-PLASM-PH ] Physics [physics]/Physics [physics]/Plasma Physics [physics.plasm-ph], [CHIM.MATE]Chemical Sciences/Material chemistry, Tribology, 021001 nanoscience & nanotechnology, Surfaces, Coatings and Films, Conductor, Ion cyclotron resonance heating, Mechanics of Materials, [ SPI.ELEC ] Engineering Sciences [physics]/Electromagnetism, Adhesion, Antenna (radio), [ SPI.PLASMA ] Engineering Sciences [physics]/Plasmas, 0210 nano-technology, CuCrZr
Abstract

International audience; Radio-Frequency (RF) contacts are key components on the International Thermonuclear Experimental Reactor (ITER) Ion Cyclotron Resonance Heating (ICRH) antenna, and these components are facing big challenges such as 2 kA operation current load and intensive sliding under up to 250 °C in high vacuum. Stainless steel (SS) 316L and CuCrZr are most likely to be applied as base materials for the conductor and the RF contacts louvers. To evaluate the performance of the selected materials, their electrical and tribological behaviors have to be studied. A multifunctional tribometer which can mimic the ITER ICRH RF contacts' relevant working conditions was designed and built in CEA. The contact resistance (Rc) and coefficient of friction (CoF) of CuCrZr-316L pair were researched on this tribometer.

Published
2017

9. Au-Ni and Rh Electroplated Coatings Evaluation for ITER Ion Cyclotron Resonance Heating Radio-Frequency Sliding Contacts

Author

Chen, Zhao Xi, primary, Hillairet, Julien, additional, Turq, Viviane, additional, Song, Yun Tao, additional, Laloo, Raphaël, additional, Yang, Qing Xi, additional, Vulliez, Karl, additional, Lombard, Gilles, additional, Bernard, Jean Michel, additional, Hernandez, Caroline, additional, Mollard, Patrick, additional, Volpe, Robert, additional, and Ferlay, Fabien, additional

Published
2018
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