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Magnetic melt texturing combined with hot pressing applied to superconducting (2223) Bi-Pb-Sr-Ca-Cu-O ceramics

We describe a new texturing process for superconducting ceramics which combines the effects of magnetic melt texturing (MMT) and hot pressing (HP), referred to in the following as the MMHPT process. This process essentially involves three steps: (i) a hot pressing at a temperature Tp, (ii) a partial melting in a magnetic field at a slightly higher temperature TM, (iii) a second hot pressing at the same temperature Tp. Optimization of the thermomechanical treatment in a magnetic field applied to the (2223) Bi-Pb-Sr-Ca-Cu-O cuprates led to highly textured and dense samples carrying transport current density Jc of 3800 A cm-2 at 77 K in zero field.