<報文>電磁材料の眞空熔解

概要

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A vacuum melting furnace on laboratory scale (35 kVA high frequency induction furnace) was constructed and some studies on the vacuum melting of magnetic materials (elctrolytic iron and silicon steel) were carried out for the purpose of obtaining the fundamental data for industrial application. Samples (about 250g) were melted in vacuum of 2〜15 mm Hg for about 30 minutes at 1,565〜1.685℃ and cast into the mold in vacuum or cooled in the crucible after the addition of dcoxidizer (mixture of metallic Mn and Si). Magnetic properties, distribution of nonmetallic inclusions and grain size were investigated for (1) samples as cast, (2) samples cooled in the crucible, (3) samples cooled or cast and then forged and cold-rolled. The results obtained were compared with those of samples melted in air and hydrogen. Magnetic properties of electrolytic iron were improved, though not satisfactorily, by vacuum melting. For example, maximum permeabilty and coercive force of a sample melted in vacuum were 17,200 and 0.45 oersted respectively, comparing with 5,000〜8,000 and 0.6〜1.3 of samples melted in air. In the case of silicon steel, beneficial effect of vacuum melting was found in the neighbourhood of 2 per cent of silicon.
東北大学の論文
1951-10-03