Abstract
Mixtures of accurately weighed Mn, Fe, Fe2O4 powder were pressed into discs and were sealed in evacuated quartz tube. They were heated at 1000°C for 9 hrs, and then were quenched into water. The composition was chosen so as to enhance the following reaction quantitatively,
4yMn+{1-4(x+y)}Fe+Fe2O4→4Mn yFe 1-(x+y)O
After the accurate composition was determined by chemical analysis, the quenched specimens were again heated at various temperatures for different durations in order to observe the thermal disintegration.
From the results of microscopic observations, it was found that manganese played as an accelerater of grain glowth in the wustite and showed a little influence on the known features of the disintegration.
During the heat treatments, lattice constants of manganese-bearing wustite increased over the stable limits, and those of deposited spinel increased with the increase of manganese conntent. On the other hand, those of metal phase remained unchanged.
From the results above mentioned, it was found that manganese distributed both in the disintegrated wüstite and the deposited spinel and was not included in the metal phase. It was also possible to discuss the mechanism of disintegration.
