電熱用ニクロムの低圧溶解について

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タイトル別名
  • On Low Pressure Melting of Nichrome for Electric Heating Materials
  • デンネツヨウ ニ クロム ノ テイアツ ヨウカイ ニ ツイテ

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抄録

The influence of different sort of raw material chromium on properties of Nichrome for electric heating materials has been clarified, this paper being the first report. The alloys containing the different sort of chromium were melted in magnesia crucible by high frequency induction heating under air of 100 mmHg, deoxidized with Ni-C or Ni-Mg, and then cast in a copper mold. The chemical compositions and the plastic workability of these ingots were examined. The results obtained were as follows.<BR>(1) The Ni-C alloy was found to be mixed easily into the melt due to its high density, and a vigorous boiling phenomenon was observed to occur immediately after its addition causing the reduction of the oxygen content of the melt to a marked degree. (2) All ingots prepared by such process were capable of being forged, rolled and drawn, and also they did not show any noticeable difference among them. There was no trouble for both hot and cold working of ingots obtained from the home-made electrolytic chromium. However, air-melted Nichrome showed somewhat deterioration in the plastic workability, the effect of raw materials of chromium being found a little. (3) For the addition of 0.1% carbon by the Ni-C alloy, a boiling occurred for 14∼27 minutes, and 0.021∼0.007%C was found to remain in those ingots. The degree of the deoxidation of the molten metal was estimated to be about 0.1% as oxygen. Besides the deoxidation of molten Nichrome, some crucible reaction appeared to proceed.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 27 (10), 503-506, 1963

    公益社団法人 日本金属学会

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