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vacuum induction melting
Vacuum induction melting (VIM) utilizes electric currents to melt metal within a vacuum. The first prototype was developed in 1920. One of the only ways to induce a current within a conductor is through electromagnetic induction. Electromagnetic induction induces eddy currents within conductors by changing the magnetic field. Eddy currents create heating effects to melt the metal.〔(【引用サイトリンク】title=Vacuum Induction Melting and Casting )〕 Vacuum induction melting has been used in both the aerospace and nuclear industries.〔
== History ==
E.F. Northrup built the first prototype of a vacuum induction furnace in 1920 in the United States of America. In 1923, German scientist Wilhelm Rohn continued to advance the VIM technology along with founding the Heraeus melting facility. Medium frequency furnaces were seen soon afterwards in England and Sweden in 1927.〔 The process was initially developed to refine certain special metals such as cobalt and nickel. As these metals and alloys became more common, the process of VIM became more widely used. VIM now helps to melt a variety of metals for aircraft and nuclear applications.〔http://www.consarc.com/pages/vim.html〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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