Accession Number : ADA195615

Title :   Processing of Mixed Oxide Superconductors,

Corporate Author : CAMBRIDGE UNIV (UNITED KINGDOM) DEPT OF ENGINEERING

Personal Author(s) : Micheelsen, B ; List, F

PDF Url : ADA195615

Report Date : Nov 1987

Pagination or Media Count : 36

Abstract : The most important conclusion was that the barriers pre venting useful super currents are rather widely spaced and this should make it easier to develop a process to eliminate them. It has become clear that two sets of critical current densities are involved in these materials, the currents between grains and the currents within grains. To distinguish between them we have to make the samples in the form of hollow cylinders and measure the flux in coils round the cylinders and within them. This apparatus is now working and we are in the process of calibrating it. We shall then be in a position to assess quantitatively the effects of various processing techniques. We are also assembling in inductance apparatus to measure AC losses, which will give further information on the current densities. The magnetic separation is proving a rather complex phenomenon. It is clear that particle size and anistropy are relevant parameters. The original geometries also led to clumping of the particles which may prevent efficient separation. Work on these problems is in progress on a redesigned apparatus. Keywords: Superconductivity. (mgm)

Descriptors :   ALTERNATING CURRENT, BARRIERS, CURRENT DENSITY, CURRENTS, CYLINDRICAL BODIES, DENSITY, EFFICIENCY, INDUCTANCE, LOSSES, MAGNETIC SEPARATION, METHODOLOGY, MIXING, OXIDES, PARTICLE SIZE, PARTICLES, PROCESSING, SEPARATION, SUPERCONDUCTIVITY, SUPERCONDUCTORS, VENTING

Subject Categories : Electricity and Magnetism

Distribution Statement : APPROVED FOR PUBLIC RELEASE