Reaction of Tungsten with Melts in the Cu - Co System

We have studied the solubility at 1200°C of tungsten in Cu - Co melts and the growth kinetics of a W^sub 6^Co^sub 7^ layer at the tungsten -- melt interface. We have established the composition of the melt in the three-phase equilibrium tungsten -- W^sub 6^Co^sub 7^ -- melt: 0.0195 Co, 4.8 · 10^sup -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: lgX^sub W^ = -7.117 + 25.7 · X^sub Co^^sup 1/2^ - 41.06 · X^sub Co^, where X^sub W^ and X^sub Co^ 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.[PUBLICATION ABSTRACT]