New Manufacturing Method for Fe-Si Magnetic Powders Using Modified Pack-Cementation Process
- New Manufacturing Method for Fe-Si Magnetic Powders Using Modified Pack-Cementation Process
- 변지영; Jang Won Kim; Jeong Whan Han; Pyungwoo Jang
- compressed core; magnetic materials; chemical synthesis; powder processing; diffusion
- Issue Date
- Metals and Materials International
- VOL 19, NO 2, 267-271
- 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 °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.
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