TY - JOUR
T1 - Mechanical properties of RE-Ba-Cu-O bulk superconductors
AU - Sakai, N.
AU - Seo, S. J.
AU - Inoue, K.
AU - Miyamoto, T.
AU - Murakami, M.
N1 - Funding Information:
This work was supported by the New Energy and Industrial Technology Development Organization (NEDO) as Collaborative Research and Development of Fundamental Technologies for Superconductivity Applications under the New Sunshine Program administered by the Agency of Industrial Science and Technology (AIST) of the Ministry of International Trade and Industry (MITI) of Japan.
Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.
PY - 2000/6
Y1 - 2000/6
N2 - It is critically important to increase mechanical properties of RE-Ba-Cu-O bulk superconductors for practical applications. In this paper, we first studied the formation mechanism of cracking in Y-Ba-Cu-O and Sm-Ba-Cu-O massive blocks. The cracking is formed with the thermal stress during the thermal cycles, in particular, for large grain samples. The tetragonal to orthorhombic phase transformation also causes cracking mainly along the (001) cleavage planes. In addition, the cracks have the chance to propagate when strong magnetic fields are applied. Sm-Ba-Cu-O seems to be intrinsically more sensitive to cracking due to the larger lattice parameters than Y-Ba-Cu-O. However, microstructure is more important in determining the mechanical properties such as the homogeneity of RE211 inclusions or pores. Ag addition was found to be effective in improving the mechanical properties through the densification and/or the reduction in defect density.
AB - It is critically important to increase mechanical properties of RE-Ba-Cu-O bulk superconductors for practical applications. In this paper, we first studied the formation mechanism of cracking in Y-Ba-Cu-O and Sm-Ba-Cu-O massive blocks. The cracking is formed with the thermal stress during the thermal cycles, in particular, for large grain samples. The tetragonal to orthorhombic phase transformation also causes cracking mainly along the (001) cleavage planes. In addition, the cracks have the chance to propagate when strong magnetic fields are applied. Sm-Ba-Cu-O seems to be intrinsically more sensitive to cracking due to the larger lattice parameters than Y-Ba-Cu-O. However, microstructure is more important in determining the mechanical properties such as the homogeneity of RE211 inclusions or pores. Ag addition was found to be effective in improving the mechanical properties through the densification and/or the reduction in defect density.
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U2 - 10.1016/S0921-4534(00)00153-2
DO - 10.1016/S0921-4534(00)00153-2
M3 - Conference article
AN - SCOPUS:0033692105
SN - 0921-4534
VL - 335
SP - 107
EP - 111
JO - Physica C: Superconductivity and its Applications
JF - Physica C: Superconductivity and its Applications
IS - 1
T2 - 9th Japan-US Workshop on High-Tc Superconductors
Y2 - 13 October 1999 through 15 October 1999
ER -