Guideline for Handling of DI-BSCCO

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Guideline for Handling of DI-BSCCO

Handling

  • Do not pull the wire beyond the critical tension.
  • Do not bend the wire below the critical diameter.
  • Take note of the critical stress when bending and pulling the wire at the same time.
  • Effect by other mechanical stress for example, twist, edge-bend and so on, is recommended to be evaluated before using.
  • Critical bending diameter and critical tensile stress are the values under individual experience. If bending and stress are loaded, the values may change.

Storage

  • Keep in the original vinyl bag and be aware of the life of the silica-gel.
  • Keep the wire dry and clean.
  • Keep away from water.
  • Do not expose the wire to a corrosive atmosphere.
  • Do not rest heavy objects on the spool or the wire.
  • Comply with local regulation when disposal.

Soldering

  • The surface of the wire to be soldered must be cleaned.
  • Use a flux.
  • Use an adequate solder to prevent cold brittleness (for all DI-BSCCO types) and silver leaching (for bare wires, Type H, G).
  • The melting point(M.P.) of Pb-free solder for lamination is 219 Degree Celsius.
  • If the temperature raises over around M.P., the lamination may peel off.

Splice

A longer overlap length will result in a smaller splice resistance. However, a shorter overlap length will result in a better stiffness at the splice point. The splice structure (splice length 20mm) below is recommended as one example by the balance between the splice resistance and the stiffness at the splice point.

Type H

Type HT - SS

Type HT - CA

Recommended Flux

KOKI*** : JS-E-15X

Thickness of Splice (mm)

≦ 0.53

≦ 0.69

≦ 0.81

Width of Splice (mm)

≦ 4.6

≦ 4.8

≦ 4.8

Resistance (nΩ )

≦ 40

≦ 950

≦ 90

Critical Wire Tension** @R.T. (N)

≧ 80

≧ 230

≧ 280

Critical Double Bending Diameter** @R.T. (mm)

180

140

140

** 95% Ic Retention  *** http://www.ko-ki.co.jp/

Curing

Maximum allowable temperature for the resin impregnation will depend on the configuration of the coil, but the wire itself is preferable to be maintained below 150 degree Celsius.

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