论文信息 - Densification effect on the microstructure and critical current density in (Bi,Pb)2Sr2Ca2Cu3OxAg sheathed tape

Densification effect on the microstructure and critical current density in (Bi,Pb)2Sr2Ca2Cu3OxAg sheathed tape

The density of oxide core in (Bi,Pb)2Sr2Ca2Cu3OxAg sheathed tape was estimated from Vickers hardness and found to be increased to as high as 93% of the theoretical density with increasing the degree of cold working. During heat treatment, this densification before heat treatment promoted the formation of a strong linked microstructure which is characterized by dense microstructure, a high degree of orientation of oxide crystal and smooth interface between the Ag sheath and oxide core. Consequently, we obtained high values of critical current density: 66 000 A/cm2 at 0 T and 14 500 A/cm2 at 1 T for 77 K.

[1] Takeshi Kato,et al. High-J/sub c/ silver-sheathed Bi-based superconducting wires , 1991 .

[2] T. Kawai,et al. Preparation of Single 110 K Phase of the Bi-Pb-Sr-Ca-Cu-O Superconductor , 1988 .

[3] M. Awano,et al. Densification and Grain-Orientation of Bi-Pb-Sr-Ca-Cu-O Superconductors by Hot-Pressing , 1988 .

[4] Y. Yamada,et al. Microstructural study of Bi(2223)/Ag tapes with Jc(77 K, 0 T) values of up to 3.3*104 A cm-2 , 1991 .

[5] K. Sandhage,et al. Thermostability and decomposition of the (Bi,Pb)2Sr2Ca2Cu3O10 phase in silver‐clad tapes , 1992 .

[6] S. Murase,et al. Critical currents and flux creep in orientated BiPbSrCaCuO 110 K phase made by the powder in tube method , 1990 .

[7] T. Hasegawa,et al. Design and fabrication of Bi-based superconducting coil , 1993, IEEE Transactions on Applied Superconductivity.

[8] K. Osamura,et al. Work instability and its influence on the critical current density of silver sheathed Bi2223 tapes , 1992 .

[9] A. Yamamoto,et al. Assignment of the Powder X-Ray Diffraction Pattern of Superconductor Bi2(Sr, Ca)3-xCu2Oy , 1988 .