Nanostructural Characterization of Low Resistance Joints Using Ag Pastes for GdBa2Cu3O7-x Coated Conductors

29th International Symposium on Superconductivity

Kato, Tomohiro^1 ; Machi, Takato^2 ; Yokoe, Daisaku^1 ; Yoshida, Ryuji^1 ; Kato, Takeharu^1 ; Izumi, Teruo^2 ; Hirayama, Tsukasa^1 ; Shiohara, Yuh^3

Nanostructures Research Laboratory, Japan Fine Ceramics Center, 2-4-1 Mutsuno, Atsuta-ku, Nagoya

456-8587, Japan^1

Research Institute for Energy Conservation, Department of Energy and Environment, National Institute of Advanced Industrial Science and Technology, 1-2-1 Namiki, Tsukuba

305-8564, Japan^2

Industrial Superconductivity Technology Research Association, 3-2-1 Sakado, Takatsu-ku, Kawasaki

213-0012, Japan^3

关键词: Ag layers;    Ag particles;    Coated conductors;    Electrical resistances;    Face to face;    Low resistance;    Nano sized;    Nanostructural;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/871/1/012044/pdf
DOI  :  10.1088/1742-6596/871/1/012044

来源: IOP

【 摘 要 】

GdBa2Cu3O7-xcoated conductors were splice jointed by a face-to-face manner using a paste containing nano-sized Ag particles under a pressure of about 50 MPa at 150 °C for 1 hr. The low electrical resistance of 6 nΩ at the joint was attained. Nanostructural characterizations of the starting Ag paste and the jointed region of the coated conductors were carried out using scanning electron microscopy and transmission electron microscopy. The size of the Ag particles in the starting pastes were confirmed to be a few tens of nanometers in diameter. The size of Ag particles became larger during the jointing process. Both the surfaces of the stabilizing Ag layers were partially bonded by the Ag particles. No oxides or other elements were detected in the region of the bonding parts.