New manufacturing method for Fe-Si magnetic powders using modified pack-cementation process

Authors
Byun, Ji YoungKim, Jang WonHan, Jeong WhanJang, Pyungwoo
Issue Date
2013-03
Publisher
KOREAN INST METALS MATERIALS
Citation
METALS AND MATERIALS INTERNATIONAL, v.19, no.2, pp.267 - 271
Abstract
This paper describes a new method for making Fe-Si magnetic powders using a pack-cementation process. It was found that Fe-Si alloy powders were formed by a reaction of the pack mixture of Fe, Si, NaF, and Al2O3 powders at 900 A degrees C for 24 h under a hydrogen atmosphere. Separation of the Fe-Si alloy powders was dependent on the particle size of the Fe powders in the pack. For small Fe powders, magnetic separation in a medium of strong alkali solution was recommended. But, for relatively larger Fe powders, the Fe-Si alloy powders were easily separated from Al2O3 powders using a magnet in air atmosphere. The Si content in the Fe-Si magnetic powders were easily controlled by changing the weight ratio of Si to (Si+Fe) in the pack.
Keywords
SPRAY-PYROLYSIS; SPRAY-PYROLYSIS; magnetic materials; chemical synthesis; powder processing; diffusion; compressed core
ISSN
1598-9623
URI
https://pubs.kist.re.kr/handle/201004/128295
DOI
10.1007/s12540-013-2022-1
Appears in Collections:
KIST Article > 2013
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