Effects of Vacuum Treatment on Dissolution or Liberation of Oxygen into or out of Iron and Nickel Melts (Studies on Vacuum Induction-Melting of Iron and Nickel, II)

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  • 鉄およびニッケル溶湯における酸素の溶解または逸脱におよぼす真空処理の影響
  • テツ オヨビ ニッケル ヨウトウ ニ オケル サンソ ノ ヨウカイ マタハ イツダツ ニ オヨボス シンクウ ショリ ノ エイキョウ

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The dissolution and the liberation of oxygen into and out of the melts under high or medium vacuum were studied to clarify the background for the vacuum melting of iron, nickel and their alloys, by employing a high-vacuum induction furnace for laboratory use and a vacuum-fusion gas-extraction apparatus, both of which were designed by the author. The main results observed were (1) in nickel melts in alumina crucible, the dissolved oxygen content in melt due to the partial pressure of oxygen in air in the range of medium vacuum is approximately proportional to the square root of its pressure, while in iron melt, the inclination is a little smaller than that in nickel melt, and the oxygen content in melt is about 0.005 per cent by weight in both iron and nickel, under a vacuum of 5×10−2 mmHg controlled by flowing dry air, for an exposure time of 30 minutes, (2) the decrease of oxygen content due to the time of holding in high vacuum of 10−5 mmHg is very small in both iron and nickel melts even when they contain a large amount of oxygen; moreover, there is a slight increase of oxygen content of both iron and nickel melts of initially low oxygen content, after a long hold in high vacuum.

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