THERMALLY INDUCED PRE-STRESS AND CRITICAL CURRENT DENSITY OF PbMo6S8 WIRES.

B. Seeber, W. Glaetzle, D. Cattani, R. Baillif, O. Fischer

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Abstract

Powder-metallurgical-processed PbMo//6S//8 monofilamentary wires with a molybdenum matrix suffer under a tensile prestress on the superconducting core due to a difference in the thermal expansion coefficient of the constituents. In this case, the observed critical current densities may be up to two orders of magnitude smaller compared to bulk samples. The critical current density of PbMo//6S//8 monofilamentary wires was enhanced by a compressive prestress on the superconductor. This was achieved by developing a hot extrusion and drawing technology based on a molybdenum stainless-steel matrix. J//c is now in the range of 1 multiplied by 10**8 A/m**2 at 14 T and 4. 2 K, which corresponds approximately to the value observed in PbMo//6S//8 bulk samples. Lengths of up to 1 km of these wires have already been manfuactured.

Original languageEnglish
JournalIEEE Transactions on Magnetics
VolumeMAG-23
Issue number2
StatePublished - 1987
Externally publishedYes

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