Abstract
The kinetics of liquid-phase sintering in tungsten-nickel-copper alloys were examined in the temperature range 1200°–1500°C. The rate constant of the sintering process was evaluated from the volume change as a function of sintering time. The activation energy for the sintering process was about 70 kcal/mole in all three compositions and was independent of the binder phase composition. The average growth of tungsten particles was examined as a function of sintering time in W-3 Ni-8 Cu and W-7 Ni-4 Cu alloys and it was found that mean grain size increased at a rate which was proportional to sintering time, t 1 3 . The activation energy of grain growth was 67 kcal/mole in both systems and is in good agreement with those of 68 kcal/mole determined by the Greenwood's equation and 70 kcal/mole derived for liquid-phase sintering experiments carried out under the same conditions.
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