Interference No. 103,141
or the like. The conductor is manufactured by placing super-
conducting oxide powder in a tube of so-called normal metal.
The metal is normal in the sense that it is not
superconductive.
The normal metal thus establishes a cladding around the oxide
powder. The powder and the cladding are subject to a cross-
section reduction metal working procedure to reduce the powder
and the cladding to a wire size article or elongate body.
Thereafter, the elongate body is heat treated so that
substantial sintering of the oxide powder occurs, resulting in
a product that has a superconducting core in a normal metal
outer cladding.
In Jin’s disclosure, the superconducting oxide,
YBa Cu O , is of the so-called 1,2,3-type. When the oxide
2 3 6.9
powder is sintered, provision must be made to keep the oxygen
content of the sintered oxide within an acceptable range.
Solutions to this problem include selecting a cladding that
does not oxidize at the sintering temperature preventing
reaction of the cladding with the oxide powder, or providing
orifices in the cladding to admit additional oxygen.
3
Page: Previous 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Next
Last modified: November 3, 2007