TY - JOUR
T1 - Complex pulse magnetization process and mechanical properties of spark plasma sintered bulk MgB2
AU - Miryala, Muralidhar
AU - Arvapalli, Sai Srikanth
AU - Sakai, Naomichi
AU - Murakami, Masato
AU - Mochizuki, Hidehiko
AU - Naito, Tomoyuki
AU - Fujshiro, Hiroyuki
AU - Jirsa, Milos
AU - Murakami, Akira
AU - Noudem, Jacques
N1 - Funding Information:
This work was partly supported by Shibaura Institute of Technology (SIT) International Research Center for Green Electronics and Grant-in-Aid FD research budget code: 721MA56383. One of the authors (SSA) acknowledges support from SIT for his post-doctoral fellowship.
Publisher Copyright:
© 2021 The Authors
PY - 2021/11
Y1 - 2021/11
N2 - High-density MgB2 bulks with superior mechanical and superconducting properties were fabricated using spark plasma sintering (SPS). The sharp superconducting transition at 37.5 K proved high quality of the superconductors. Critical current density significantly exceeded that of conventionally sintered bulks. Flux pinning diagrams indicated dominance of grain boundary pinning, with peak position at 0.2. SPS bulks showed improved mechanical properties with 8-times higher bending strength compared to dense hot isostatic pressed bulks. Trapped field was measured at 14 K and 20 K, 1 mm above the bulk's surface, with applied pulse field up to 2 T. A local overheating together with a complex trapped field formation in the MgB2 bulks during pulse-field magnetization were studied to elucidate limitations of Pulse Field Magnetization.
AB - High-density MgB2 bulks with superior mechanical and superconducting properties were fabricated using spark plasma sintering (SPS). The sharp superconducting transition at 37.5 K proved high quality of the superconductors. Critical current density significantly exceeded that of conventionally sintered bulks. Flux pinning diagrams indicated dominance of grain boundary pinning, with peak position at 0.2. SPS bulks showed improved mechanical properties with 8-times higher bending strength compared to dense hot isostatic pressed bulks. Trapped field was measured at 14 K and 20 K, 1 mm above the bulk's surface, with applied pulse field up to 2 T. A local overheating together with a complex trapped field formation in the MgB2 bulks during pulse-field magnetization were studied to elucidate limitations of Pulse Field Magnetization.
KW - Critical current density
KW - Mechanical properties
KW - MgB2
KW - Pulse field magnetization
KW - Spark plasma sintering
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U2 - 10.1016/j.mseb.2021.115390
DO - 10.1016/j.mseb.2021.115390
M3 - Article
AN - SCOPUS:85115222781
VL - 273
JO - Materials Science and Engineering B: Solid-State Materials for Advanced Technology
JF - Materials Science and Engineering B: Solid-State Materials for Advanced Technology
SN - 0921-5107
M1 - 115390
ER -