THEORY AND TECHNOLOGY OF SINTERING, THERMAL, AND CHEMICOTHERMAL TREATMENT DENSIFICATION KINETICS OF W-Fe-Sn PSEUDOALLOYS IN LIQUID PHASE SINTERING

摘要

The densification kinetics in liquid phase sintering of W-Fe-Sn powder composites containing 90 wt. percent of a refractory component and 10 wt. percent of a low-melting component is strongly dependent on the iron content in the melt. As the iron content in composites increases, the concentration dependence of their densification shows a maximum. Samples containing more than 1.5 wt. percent Fe grow intensively because of the formation of W_6Fe_7 intermetallide whose decomposition temperature is higher than that of liquid phase sintering.