| 摘要 |
<p>Superconductor tapes are made by the 'powder-in-tube' technique, that is by filling a tube with particulate superconducting material (including precursor particles convertible to a superconducting state) to form an intermediate, drawing the intermediate through a plurality of dies to reduce its cross section, annealing the reduced intermediate, and rolling it through a series of roll passes to flatten and further reduce it. After the intermediate has been annealed, it is drawn through a further die by tension applied to it by a first, flattening roll pass in which at least one of the rolls is driven. In this way, imperfections arising in the handling of the intermediate in the annealed state may be substantially removed by the said further die and it reaches the flattening roll pass in a straight condition under tension and free from deleterious stresses. This permits the production of tapes that are substantially straighter, in an edgewise sense, than those made previously.</p> |
