Effect of various mechanical deformation techniques on pinning force densities in Ag/Bi-2223 tapes
نویسندگان
چکیده
Ag/Bi-2223 tapes were fabricated using the Powder-In-Tube method, involyH1~ intermediate deformation techniques of sandwich rolling (SR), pressing (P) and nQl1l1~~ rolling (NR). Magnetic field B depen:lence of Jc was measured. Depending 6rt:~~' relationship between )c and B, the irreversible magnetic field Birr was determineli)lIl..W: pinning force density F was calculated. The experimental results showed that selffiel%~;lb was linear with the relative density for SR-, Pand NR-tapes. Our experimental resftlts~ support that NR-, P-, andSR-tapes have a same sort of pinning center and the interme#l~tl; deformation processing cannot change property of pinning centers, but can effectth§'" pinning force strength. Our experimental results also support that sandwich rolling istM~ best technique for fabricating Ag/Bi-2223 tapes.
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