PRAKASAM, Mythili; BALIMA, Felix; NOUDEM, Jacques; LARGETEAU, Alain

doi:10.3390/ceramics3040042

Métadonnées

Afficher la notice complète

Licence d’utilisation du document

PRAKASAM, Mythili
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

BALIMA, Felix
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

NOUDEM, Jacques
Laboratoire de cristallographie et sciences des matériaux [CRISMAT]

Langue

Article de revue

Ce document a été publié dans

Ceramics. 2020-12, vol. 3, n° 4, p. 521-532

MDPI

Résumé en anglais

Magnesium diboride (MgB2) ceramics, due to their impressive transition temperature of 39 K for superconductivity, have been widely investigated. The possibility to obtain highly dense MgB2 ceramics with fine microstructure and grain boundaries acting as pinning sites by novel high-pressure-assisted spark plasma sintering (HP-SPS) is reported in this article. HP-SPS was employed to reach 100% density in MgB2 ceramics, and high pressure was utilized in the consolidation of MgB2. An increase in pressure helped in stabilizing the MgB2 phase above thermal decomposition, thus avoiding the formation of non-superconducting phases such as MgO and MgB4. Pressure allowed strengthening of the covalent bond (condensation effect) to increase the thermal stability of MgB2. HP-SPS yielded high mechanical hardness in MgB2 (1488 HV). For better electrical connectivity, which leads to large magnetic moments in high density samples were obtained with the beneficial effect of high applied pressure (1.7–5 GPa) at high temperature (>1000 °C). The combination of the SPS process and high pressure ensured retention of the homogeneous fine microstructure required to obtain high current density and high hardness< Réduire

Mots clés en anglais

MgB2

High pressure

Thermal stability

Rapid sintering

Superconductor

Métadonnées

Licence d’utilisation du document

Dense MgB2 Ceramics by Ultrahigh Pressure Field-Assisted Sintering

Langue

Ce document a été publié dans

Résumé en anglais

Mots clés en anglais

DOI

Origine

Unités de recherche