Reaction of Tungsten with Melts in the Cu - Co System |
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Authors: | V V Skorokhod V P Titov Z V Sichkar' M M Churakov |
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Affiliation: | (1) Institute for Problems of Materials Science, National Academy of Sciences of Ukraine, Kiev, Ukraine |
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Abstract: | We have studied the solubility at 1200°C of tungsten in Cu - Co melts and the growth kinetics of a W6Co7 layer at the tungsten — melt interface. We have established the composition of the melt in the three-phase equilibrium tungsten
— W6Co7 — melt: 0.0195 Co, 4.8 · 10−5 W, the rest is Cu (in atomic fractions). In the studied composition range for the melt, the solubility of tungsten is described
well by the expression: lgXW = −7.117 + 25.7 · XCo
1/2 − 41.06 · XCo, where XW and XCo are the atomic fractions of the corresponding elements in the melt. We have determined the correlation between the growth
rate for a layer of tungsten-containing phase at the tungsten — melt interface and the thermodynamic characteristics of the
melt.
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Translated from Poroshkovaya Metallurgiya, Nos. 5–6(443), pp. 81–86, May–June, 2005. |
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Keywords: | tungsten cobalt melt solubility kinetics layer growth three-phase equilibrium |
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