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Effect of M.G. on the Preparation of Sintered .BETA.-FeSi2
- Source :
- Journal of the Japan Society of Powder and Powder Metallurgy. 40:332-336
- Publication Year :
- 1993
- Publisher :
- Japan Society of Powder and Powder Metallurgy, 1993.
-
Abstract
- Effect of mechanical grinding (M.G.) process on preparing β-FeSi2 for thermoelectric generator by useing hot presssing (H.P.) was investigated by X-ray diffraction, EPMA and SEM.Mixture of Fe and SI powders was arc-melted in an argon atmosphere to form a button composed of α-Fe2Si5, and e-FeSi phases. The button was grinded in a conventional ball-mill for 20-650hr. X-ray diffraction analysis showed that the peaks of e and α-phases disappeared after 250 and 650hr, respectively. The ball-milled powders were hot pressed at 1110°C for 30min under 25MPa and heat treated at 840°C for 10hr and 20hr. The heat treated samples were composed of mostly β-phase with small amount of e-phase and their relative densities were more than 99%. The amount and size of the e-phase decreased with increasing ball milling time. The result showed that mechanical grinding strongly accelerated the formation of β-phase. Almost the same results were obtained oil hot pressing at 900°C for 30min without heat treatment.
Details
- ISSN :
- 18809014 and 05328799
- Volume :
- 40
- Database :
- OpenAIRE
- Journal :
- Journal of the Japan Society of Powder and Powder Metallurgy
- Accession number :
- edsair.doi...........5bfd5e5d70914e72bfc646a665c6248e
- Full Text :
- https://doi.org/10.2497/jjspm.40.332