Preparation method of frameless high-precision dry-wound superconducting coil

Abstract

The invention discloses a preparation method of a frameless high-precision dry-wound superconducting coil, which is characterized in that the coil is cured by vacuum impregnation, and the coil and a framework are quickly and conveniently separated by utilizing the characteristic that the shrinkage rate of an aluminum alloy at a liquid nitrogen temperature is greater than the radial shrinkage rate of the superconducting coil. The two ends of the machined framework are sealed through polytetrafluoroethylene and flanges; carrying out finish machining on the framework to achieve the close winding coil precision, and meanwhile, machining inlet and outlet winding grooves; cleaning the surface of the framework, plating a layer of polytetrafluoroethylene on the surface of the framework, and then placing uniform and flat mold coating cloth; a required superconducting coil is wound in a dry winding mode, the framework and the superconducting coil are integrally subjected to vacuum impregnation, and flanges at the two ends are removed after solidification; and finally, the superconducting coil is placed in a liquid nitrogen environment, a certain gap can be generated between the superconducting coil and the framework due to the fact that the radial shrinkage amount of the superconducting coil is smaller than the shrinkage amount of the aluminum alloy framework, and the framework-free superconducting coil can be obtained after the framework is removed according to the principle.

Description

technical field [0001] The invention relates to the preparation of a superconducting coil, belongs to the application field of superconducting technology, and relates to a preparation method of a high-precision dry-wound superconducting coil without a skeleton. Background technique [0002] With the continuous development and application of superconducting technology, superconducting magnets have been widely used in scientific engineering, scientific instruments and biomedical engineering due to their low energy consumption, small size, light weight and high magnetic field. Resonance imager (MRI) is the most representative. Generally speaking, the quality of magnetic resonance imaging is proportional to the strength and uniformity of the magnetic field. Therefore, the preparation of superconducting magnets with excellent performance and high stability requires careful consideration of the operation of the magnets in the design, especially the influence of mechanical disturb...

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the disadvantages that the existing manufacturing process is easy to damage the inner side of the coil and it is difficult to ensure the smoothness of the coil, and proposes a method for preparing a high-precision dry-wound superconducting coil without a skeleton. The lower shrinkage rate is greater than the radial shrinkage rate of the superconducting coil, so that the superconducting coil is separated from the aluminum alloy skeleton

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