High Critical Current Densities and Angular Dependence in MgB2-SS Tapes

G. SERRANO; A. SERQUIS; L.CIVALE; B.MAIOROV; M. T. MALACHEVSKY; C. AYALA

Bruselas, Bélgica

Conferencia; EUCAS 2007; 2007

Abstract. We present a study on the angular dependence of SiC-doped MgB2 tapes fabricated by powder-in tube (PIT) with stainless steel (SS) as sheath material. The microstructure is studied by x-ray diffraction and scanning electron microscopy. The angular dependence of the critical current density (Jc) and engineering (Je) are determined by transport measurements in liquid He and Ne. The microstructure and a-b texturing of the tapes are analyzed to understand the effects of the rolling degree on the superconducting properties. We found that for SiC doped tapes the alignment degree augmented with increasing deformation but tends to reach a plateau for aspect ratios larger than 5, while and anisotropy factor G=Jc(90°)/Jc(0°) continued increasing for larger aspect ratios. Very high Jc values were obtained for SiC doped tapes, whose cores are as dense as those from wires processed using hot isostatic pressing (HIPing). A rapid increase in the Jc anisotropy with applied field G(H) was observed for lower SiC addition and for higher temperature.