Abstract
Using differential calorimetry and dilatometry, it is found that the temperatures of the onset and the end of the ferrite–austenite transformation in the nanodispersed iron powder reduced from hydroxide are 20–30°C lower than those of the microdispersed powders formed by melt sputtering and carbonyl dissociation. An analysis of the calculated coefficients of Ivensen’s equation of the sintering kinetics and the activation energy of sintering of iron and nickel powders with various dispersions at temperatures 900 and 1100°C shows that a high concentration of structural defects at temperatures close to the temperature of the onset of the phase transformation activates sintering. The sintering mechanism of microdispersed carbonyl iron and nickel powders is assumed to be viscous flow, and that of the nanodispersed powders is the grainboundary diffusion.
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