TY - GEN
T1 - Spark plasma synthesis and sintering of superconducting MgB 2-based Materials
AU - Prikhna, Tatiana
AU - Noudem, Jacques
AU - Gawalek, Wolfgang
AU - Mamalis, Athanasios
AU - Soldatov, Alexander
AU - Savchuk, Yaroslav
AU - Moshchil, Viktor
AU - Eisterer, Michael
AU - Weber, Harald W.
AU - Dub, Sergey
AU - Habisreuther, Tobias
AU - Dellith, Jan
AU - You, Shujie
AU - Schmidt, Christa
AU - Karau, Friedrich
AU - Dittrich, Ulrich
AU - Vajda, István
AU - Sergienko, Nina
AU - Sokolovsky, Vladimir
AU - Litzkendorf, Doris
AU - Chaud, Xavier
AU - Sverdun, Vladimir
AU - Kuznietsov, Roman
PY - 2012/1/1
Y1 - 2012/1/1
N2 - 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.
AB - 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.
KW - Critical current density
KW - Mechanical properties
KW - Raman spectroscopy
KW - Spark plasma synthesis and sintering
UR - http://www.scopus.com/inward/record.url?scp=84864248198&partnerID=8YFLogxK
U2 - 10.4028/www.scientific.net/MSF.721.3
DO - 10.4028/www.scientific.net/MSF.721.3
M3 - Conference contribution
AN - SCOPUS:84864248198
SN - 9783037854204
T3 - Materials Science Forum
SP - 3
EP - 8
BT - Applied Electromagnetic Engineering for Magnetic, Superconducting and Nano Materials
PB - Trans Tech Publications Ltd
T2 - 7th Japanese-Mediterranean and Central European Workshop on Applied Electromagnetic Engineering for Magnetic, Superconducting and Nano Materials, JAPMED'7
Y2 - 6 July 2011 through 9 July 2011
ER -