起電力法による溶融銅および銅-スズ合金中の酸素の定量

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  • Determination of Oxygen in Molten Copper and Copper-Tin Alloy by the EMF Method
  • キデンリョクホウ ニ ヨル ヨウユウ ドウ オヨビ ドウ-スズ ゴウキン チュウ ノ サンソ ノ テイリョウ

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The concentration and activity of oxygen in molten copper and copper-tin alloy have been measured by the galvanic cells,<BR>(This article is not displayable. Please see full text pdf.) <BR>over the temperature range of 1100°∼1250°C for the oxygen concentration range of 2∼1000 ppm and for the tin mole fraction of 0∼5.5×10−2.<BR>The activity of tin in molten copper-tin alloy has also been measured.<BR>These measurements have shown that:<BR>(1) The activity of oxygen in copper follows Henry’s law in the measured concentration range of oxygen and its activity coefficient is expressed by the equation,<BR>(This article is not displayable. Please see full text pdf.) <BR>(2) The activity of oxygen in the copper alloy with a tin mole fraction of 7.0×10−4 follows Henry’s law in the measured concentration range of oxygen.<BR>(3) The activities of oxygen in copper alloys with tin mole factions of 2.6×10−3, 5.3×10−3, 2.7×10−2 and 5.5×10−2 follow Henry’s law in the higher concentration range of oxygen but do not in the lower concentration ranges. And their activity coefficients decrease with decreasing oxygen concentration.<BR>(4) The activity coefficient of oxygen in copper-tin alloys decreases with increasing tin concentration.<BR>(5) The activity of tin in copper-tin alloys follows Henry’s law in the measured concentration range of tin and exhibits a large negative deviation from Raoult’s law.<BR>Its activity coefficient can be written as logγSn=−2.805×103⁄T+0.6557<BR>The solubility of oxygen in molten copper-tin alloys has also been discussed.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 34 (7), 679-684, 1970

    公益社団法人 日本金属学会

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