粉末冶金技术在制备超导材料中的应用
THE APPLICATION OF POWDER METALLURGY TECHNIQUE TO MANUFACTURE OF SUPERCONDUCTING MATERIALS
-
摘要: 近年来,粉末冶金技术在制备高场磁体所需的实用超导材料方面取得了较大的进展,并已成为现有常规制备技术的重要的潜在竞争方法。本文扼要评述了粉末冶金制备技术如冷粉末工艺,热粉末工艺,多孔粉末烧结体浸渍工艺,富锡的铌锡化合物粉末工艺等的流程、现状和前景。粉末冶金技术制备的多纤维超导复合材料在高磁场下载流能或防止因受应力或应变而致的超导性能退降方面比常规导体有所改善,并已试制了一些小型高场磁体,上述进展使得人们对粉末冶金技术在超导材料制备中的应用产生很大兴趣。有些方法已开始由实验室规模过渡到工业生产。本文在介绍上述情况的同时,亦提到了这些方法的局限性和尚需解决的问题。Abstract: In recent years, several powder metallurgy processes have been developed as alternatives to the conventional processes for fabricating practical superconducting materials which are used for building high field magnets. A brief review about the fabrication technique、status and promise of some processes including cold powder process、hot powder process、infiltration process、intermediate compound powder process and others were presented in this paper. The improved performances of powder metallurgy processed multifilamentary composites at high field and the fact that some Small high field magnets have been built, making processes attractive for practical applicaton. Some processes have been extended from laboratory scale to indurtrial production. Some disadvantages of those processes were also outlined in the paper.