Mgb2 based powder for the production of super conductOrs, method for the use and production thereof
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United States of America Patent
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Issued Date -
Oct 14, 2004
app pub date -
May 4, 2004
filing date -
Mar 12, 2001
priority date (Note) -
Abandoned
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Abstract
The invention relates to an MgB.sub.2 based powder for the production of superconductors, having high reactivity which can be sintered at visibly lower temperatures and which can be compacted in large high density samples having a high superconductive transition temperature and a high critical current. The aim of the invention is achieved by virtue of the fact that the powder is a mechanical alloy powder, whose particles have an average size of d<250 .mu.m and a substructure consisting of nanocrystalline grains whereby the dimensions thereof are <100 .mu.m. The inventive powder can also contain additional chemical elements in the crystal grating of the MgB.sub.2-power particles. In order to produce said inventive, a powder mixture comprising Mg-powder particles and B-powder particles powder is reduced by metal alloying optionally in the presence of additional chemical elements until an average particle size of <250 .mu.m is achieved and a powder particle substructure comprising nanocrystalline grains measuring <100 .mu.m is formed.
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