Spark plasma synthesis and sintering of superconducting MgB 2-based Materials

Tatiana Prikhna, Jacques Noudem, Wolfgang Gawalek, Athanasios Mamalis, Alexander Soldatov, Yaroslav Savchuk, Viktor Moshchil, Michael Eisterer, Harald W. Weber, Sergey Dub, Tobias Habisreuther, Jan Dellith, Shujie You, Christa Schmidt, Friedrich Karau, Ulrich Dittrich, István Vajda, Nina Sergienko, Vladimir Sokolovsky, Doris LitzkendorfXavier Chaud, Vladimir Sverdun, Roman Kuznietsov

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

10 Scopus citations

Abstract

Superconducting (SC) and mechanical properties of spark plasma (or SPS) produced MgB2 -based materials allow their efficient applications in fault current limiters, superconducting electromotors, pumps, generators, magnetic bearings, etc. The synthesized from Mg and B at 50 MPa, 1050 °C for 30 min material has a density of 2.52 g/cm3, critical current density, jc = 7.1·105 A/cm2 at 10 K , 5.4·105 A/cm2 at 20 K, and 9·104 A/cm2 at 35 K in zero magnetic field; at 20 K its field of irreversibility Birr(20)=7 T and upper critical field B c2(20)=11 T; microhardness HV=10.5 GPa and fracture toughness K1C =1.7 MPa·m1/2 at 4.9 N-load. SPS-manufactured in- situ MgB2- based materials usually have somewhat higher jc than sintered ex-situ. The pressure variations from 16 to 96 MPa during the SPS-process did not affect material SC characteristics significantly; the jc at 10-20 K was slightly higher and the material density was higher by 11%, when pressures of 50-96 MPa were used. The structure of SPS-produced MgB2 material contains Mg-B-O inclusions and inclusions of higher borides (of compositions near MgB4, MgB 7, MgB12, MgB17, MgB20), which can be pinning centers. The presence of higher borides in the MgB2 structure can be revealed by the SEM and Raman spectroscopy.

Original languageEnglish
Title of host publicationApplied Electromagnetic Engineering for Magnetic, Superconducting and Nano Materials
PublisherTrans Tech Publications Ltd
Pages3-8
Number of pages6
ISBN (Print)9783037854204
DOIs
StatePublished - 1 Jan 2012
Event7th Japanese-Mediterranean and Central European Workshop on Applied Electromagnetic Engineering for Magnetic, Superconducting and Nano Materials, JAPMED'7 - Budapest, Hungary
Duration: 6 Jul 20119 Jul 2011

Publication series

NameMaterials Science Forum
Volume721
ISSN (Print)0255-5476
ISSN (Electronic)1662-9752

Conference

Conference7th Japanese-Mediterranean and Central European Workshop on Applied Electromagnetic Engineering for Magnetic, Superconducting and Nano Materials, JAPMED'7
Country/TerritoryHungary
CityBudapest
Period6/07/119/07/11

Keywords

  • Critical current density
  • Mechanical properties
  • Raman spectroscopy
  • Spark plasma synthesis and sintering

ASJC Scopus subject areas

  • Materials Science (all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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