Method and system for controlling chemical reactions between superconductors and metals in superconducting cables
A method, system, and apparatus for fabricating a high-strength Superconducting cable comprises pre-oxidizing at least one high-strength alloy wire, coating at least one Superconducting wire with a protective layer, and winding the high-strength alloy wire and the Superconducting wire to form a high-strength Superconducting cable.
1. A method comprising:
forming at least two protective layers around at least one high-strength alloy wire, said high strength alloy wire comprising a plurality of filaments embedded in an Ag matrix, wherein a first protective layer is an Al 2 O 3 passivation oxide layer and a second protective layer is a TiO 2 non-reactive oxide layer;
coating at least one Superconducting wire with a protective layer;
arranging said at least one high-strength alloy wire and said at least one Superconducting wire to form a high-strength Superconducting cable; and
treating said Superconducting cable with a heat treatment cycle.
2. The method of claim 1 wherein said at least one Superconducting wire comprises Bi-2212 round wire.
3. The method of claim 2 wherein said at least one high-strength alloy wire comprises FeCrAl.
4. The method of claim 3 wherein forming at least two protective layers around at least one high strength alloy wire further comprises:
pre-oxidizing and heat treating said high-strength alloy wire to form said first protective layer; and
coating said at least one high-strength alloy wire with 10 micrometer oxide to form said second protective layer.
5. The method of claim 1 wherein arranging said at least one high-strength alloy wire and said at least one Superconducting wire to form said high-strength Superconducting cable further comprises:
wrapping said at least one high-strength alloy wire and said at least one Superconducting wire into one of:
a 4+3 cable pack;
a 3+4 cable pack;
a cable-in-conduit cable; and
a Rutherford cable.
6. The method of claim 5 wherein arranging said at least one high-strength alloy wire and said at least one Superconducting wire to form said high-strength Superconducting cable further comprises:
winding said Superconducting cable into a coil.
7. The method of claim 1 wherein treating said high-strength Superconducting cable with a heat treatment cycle further comprises;
raising a temperature to 820 degrees Celsius in 100% flowing O2 for two hours; and
raising said temperature from 820 degrees Celsius to a temperature of at least 891 degrees Celsius for 0.2 hours.