Thermodynamic Investigation on Molten Cu-Ni-Fe Alloys by the Double Knudsen Cell-Mass Spectrometer System

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  • クヌーセンセル-質量分析法による溶融Cu-Ni-Fe系合金の熱力学的研究
  • クヌーセンセル シツリョウ ブンセキホウ ニヨル ヨウユウ Cu Ni Feケ

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Abstract

For thermochemical analysis of the phase equilibrium between the nickel alloy and slag phases in relation to the nickel smelting process, the mass spectrometer combined with a double Knudsen cell was adopted to measure the activities of the elements in the molten Cu-Ni and Cu-Ni-Fe alloys and the activity of sulfur below 5 at%S in the ternary alloys at 1623 K. A major feature of this set-up is that the activity values of the components can be determined at every experimental point without applying the Belton-Fruehan equation which requires the ion intensity measurement over the whole alloy composition region. In the present study, the following results were obtained.<BR>(1) The activities of copper and nickel in the molten Cu-Ni alloys show a slightly positive deviation from the Raoult’s law and the activity behavior is consistent with a reference in the composition region higher than 50 at%Cu.<BR>(2) The copper activity in the composition region over 30 at%Cu of the Cu-Ni-Fe ternary system shows a positive deviation from the ideal behavior and the deviation increases with increasing iron content in the Cu-Ni alloy.<BR>(3) The activity coefficients of sulfur at infinite dilute solution in the Cu-Ni-Fe ternary alloys are found to be between 3 to 4×10−2 in the composition region over 30 at%Cu. This tendency agrees with the sulfur behavior expected from the Cu-Ni-S and Fe-Ni-S systems.

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