Kinetic studies on the dissolution of nitrogen in CaO-Al2O3, CaO-SiO2, and CaO-CaF2 melts |
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| Authors: | Hideki Ono Kazuki Morita Nobuo Sano |
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| Affiliation: | (1) Present address: Japan Society for the Promotion of Science, Osaka University, 565 Osaka, Japan;(2) the Department of Materials Science and Processing, Osaka University, 565 Osaka, Japan;(3) the Department of Metallurgy, The University of Tokyo, 113 Tokyo, Japan |
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| Abstract: | The rate of nitrogen dissolution in CaO-Al2O3, CaO-SiO2, and CaO-CaF2 melts was measured by 14N-15N isotope exchange reaction. The rate constant of nitrogen dissolution in CaO-based oxide melts, which is defined as first order with respect to nitrogen partial pressure, was found to be much smaller than that in molten iron-based alloys investigated in our previous work. The activation energies for nitrogen dissolution in 40 mass pct CaO-60 Al2O3 and 50 CaO-50 SiO2 melts are 224 and 581 kJ/mol, respectively. For CaO-Al2O3 and CaO-SiO2, dependence of the rate constant on composition is very similar to that of nitride capacities. Moreover, it was confirmed that the rate constant was not affected by oxygen or nitrogen partial pressure. |
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