金属圧粉体の焼結中の電気抵抗変化

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タイトル別名
  • Electrical Resistivity of Metal Powder Compacts during Sintering
  • キンゾク アップンタイ ノ ショウケツ チュウ ノ デンキ テイコウ ヘンカ

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抄録

Electrical resistivity measurements have been carried out to clarify the early stage of sintering of metal compacts. The effects of compacting pressure and sintering atmosphere on the change in electrical resistivity at a continuously raising temperature were investigated with copper and nickel powder compacts.<BR>With increasing the compacting pressure, the electrical resistivity of powder compacts was lowered, but the tendency of temperature-resistivity curves was little affected. It is concluded that the effect of compacting pressure on the early stage of sintering was not essential.<BR>A conspicuous effect of sintering atmosphere on the change of electrical resistivity in heating was observed. In hydrogen, two steps of marked decrease of electrical resistivity appeared in the temperature-resistivity curves. The reason is considered that one appearing below 100°C is caused by the change in the surface condition of powders, that is, the desorption of trapped gases or adsorption of hydrogen gas and the reduction of oxide by hydrogen, and the other is caused by the adhesion of powders. On the other hand, in vacuo and in argon, only one maximum was observed in the temperature-resistivity curves, according to the adhesion of powders followed by the continuous desorption of trapped gases. In all cases a remarkable decrease of electrical resistivity occurred below the so-called sintering temperature where the compacts show the shrinkage.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 28 (6), 293-297, 1964

    公益社団法人 日本金属学会

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