Fe-Si圧粉体の焼結過程について

概要

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In order to investigate the sintering process of Fe-Si compacts, the dilatometric and microscopic examination of those compacts were systematically carried out. The results were summarized as follows: 1) The shrinkage of those compacts was scarcely any affected by the amount of Si in the α-iron range, but was remarkably increased with the amount of Si in the γ-iron range. 2) After the Acs transformation in the Si compositions range higher than the γ-loop limit the trans-formation γ→α occured in sequence according to the change in the Si concentration. 3) It was assumed that for the sintered Fe-Si compacts of composition over the γ-loop the sintering was accelerated because of the stable α-phase in high temperature and the easy elimination of pores owing to the finer grains. 4) It was assumed to be due to the Kirkendall effect that larger pores were temporarily left at the places where Si powders had existed in the case of carbonyl iron powder. 5) In the last stage of the sintering process, any intermediate phase was not found and the α-phase having a diffused Si remained.
社団法人粉体粉末冶金協会の論文