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Open AccessArticle

Dense MgB2 Ceramics by Ultrahigh Pressure Field-Assisted Sintering

1
CNRS, University Bordeaux, ICMCB, UMR 5026, 33600 Pessac, France
2
Normandie University, Ensicaen, Unicaen, CNRS, CRISMAT, 14000 Caen, France
*
Author to whom correspondence should be addressed.
Received: 14 July 2020 / Revised: 13 November 2020 / Accepted: 7 December 2020 / Published: 21 December 2020
(This article belongs to the Special Issue Spark Plasma Sintering Technology)
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. View Full-Text
Keywords: MgB2; high pressure; thermal stability; rapid sintering; superconductor MgB2; high pressure; thermal stability; rapid sintering; superconductor
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MDPI and ACS Style

Prakasam, M.; Balima, F.; Noudem, J.; Largeteau, A. Dense MgB2 Ceramics by Ultrahigh Pressure Field-Assisted Sintering. Ceramics 2020, 3, 521-532. https://0-doi-org.brum.beds.ac.uk/10.3390/ceramics3040042

AMA Style

Prakasam M, Balima F, Noudem J, Largeteau A. Dense MgB2 Ceramics by Ultrahigh Pressure Field-Assisted Sintering. Ceramics. 2020; 3(4):521-532. https://0-doi-org.brum.beds.ac.uk/10.3390/ceramics3040042

Chicago/Turabian Style

Prakasam, Mythili; Balima, Felix; Noudem, Jacques; Largeteau, Alain. 2020. "Dense MgB2 Ceramics by Ultrahigh Pressure Field-Assisted Sintering" Ceramics 3, no. 4: 521-532. https://0-doi-org.brum.beds.ac.uk/10.3390/ceramics3040042

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