Powder-in-tube

Powder-in-tube

Powder-in-tube (PIT) : A process used for making electrical conductors from brittle superconductors eg Niobium-tin [http://ieeexplore.ieee.org/Xplore/login.jsp?url=/iel5/77/17989/00828394.pdf?arnumber=828394 Powder-in-tube (PIT) Nb3Sn conductors for high-fieldmagnets] , BSCCO [http://www.wtec.org/loyola/scpa/05_02.htm Sheathed or Powder-in-Tube Conductors] [http://www.rsc.org/ej/JM/1997/a606896k.pdf ] or MgB2 [http://arxiv.org/abs/cond-mat/0109085 Properties of PIT MgB2 wires.] .

PIT sometimes called "oxide powder in tube" (OPIT).

This process is used because the high-temperature superconductors are too brittle for normal wire forming processes.

The tubes are metal, often silver. Often the tubes are heated to react the mix of powders. Once reacted the tubes are sometimes flattened to form a tape-like conductor.

Sadly YBCO does not have the weak layers required to generate adequete 'texture' (alignment) in the PIT process.

References


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