Thermal shock resistance and bending strain tolerance of electrophoretically deposited Bi2Sr2CaCu2Oy/Ag tapes

Self Cite

MgO or SrSO 4 particulates were introduced into Bi-2212/Ag tapes during the fabrication process with the intention of producing flux pinning centres. It was found that (i) MgO or SrSO 4 normal particles added to Bi-2212 superconductor do not react chemically with or corrupt the Bi-2212 phase, but MgO may alter the phase evolution during the partial melting and the solidification of Bi-2212 and reduce the second-phase inclusions, (ii) MgO addition may enhance the flux pinning potential in a certain region of temperature and magnetic field (the contributions of MgO addition to the flux pinning potential are still not clear) and (iii) SrSO 4 addition appears to have no effect on the properties of finished samples.

“…Figure 1 shows the particles of MgO. The precursor powder used in this paper is from a different batch and has a different phase content to those used in our previous publications [4,18].…”

Section: Experimental Methodsmentioning

confidence: 99%

Effects of MgO addition on phase evolution and flux pinning of Bi-2212/Ag tapes fabricated by electrophoretic deposition and partial-melting processing

Sunli

Dew‐Hughes

Zheng

et al. 1996

Self Cite

“…Some important research has been carried out on the strain limits of Ag/BSCCO [8][9][10][11][12][13][14][15][16][17][18], most of which have 0953-2048/98/090858+08$19.50 c 1998 IOP Publishing Ltd concentrated on the strain limits under an applied stress. In such tests a stress criterion for fracture is invariably applied.…”

Section: Fracture: Stress Criterion Versus Energy Criterionmentioning

confidence: 99%

The mechanical properties of (Bi-Pb)SrCaCuO

Oduleye

Penn

Alford

1998

The mechanical properties of (Bi, Pb)SrCaCuO (BSCCO) are examined. Particular attention is paid to the effects of porosity on the elastic modulus, the flexural strength, the hardness and the fracture toughness. A study of the effects of porosity on these properties is crucial in developing a clearer idea of the behaviour of BSCCO conductors in service and is a prerequisite for modelling using, for example, finite element techniques. Experiments are carried out which show the effect of pore volume on the mechanical properties and the effect of processing on the fracture toughness. It is found that the critical defect length in BSCCO is surprisingly large and this has important implications for the processing of the materials and for the limits of application.

“…The bending posts are the same distance apart (10 mm). Tapes were held between insulated spring steel strips to allow reversible bending [20]. Critical currents were measured by conventional four-point testing with the voltage contacts outside the two central bending posts.…”

Section: Methodsmentioning

confidence: 99%

Bending strain tolerance of critical current values in Tl-based superconducting tapes

Naylor¹,

Fox²,

Moore³

et al. 1997

Mono-and multifilamentary silver-sheathed Tl-1223 powder-in-tube (PIT) tapes have been strained by bending at 77 K. The changes in the critical current of the samples due to the bending strain have been related to the tape microstructure. The shapes of the curves are similar to those found in the literature for Bi-2223 PIT samples. In situ reacted samples show a significant improvement in bending strain tolerance compared to samples prepared using pre-reacted powder.