| 摘要 |
PURPOSE:To make it possible to form a coil concerned directly of raw material powder or a mixture of the raw material powder by firstly processing powder of a ceramics system superconductive material or its raw material powder in a coil, using a metallic container by drawing and coiling followed by sintering. CONSTITUTION:Superconductive material powder is densely filled in a metallic container to be drawn together with the metallic container so as to obtain a wire rod. Then, the wire rod obtained by drawing is coiled so as to obtain a coil having the desired size and shape for being put to a sintering process in order to sinter the superconductive material powder existing inside a coil wire rod. Next, the coil passed the sintering process is insulated, while, when there is a gap between the neighboring wires, the gap is impregnated with the electrically insulating varnish followed by heat-hardening or the like. In this case, when there is no gap between the neighboring wires at least a part of a metal housing originating in the metallic container on the wire surface is removed by chemical treatment or the like so as to provide the gap between the neighboring wires for insulation treatment. Thereby, the coil can be formed directly of powder of a raw material ceramics system conductive material or a mixture of the raw material powder so as not to require a coiling process of a wire rod. |
