A new manufacturing method for Fe-Si magnetic powders using modified pack-cementation process
- A new manufacturing method for Fe-Si magnetic powders using modified pack-cementation process
- 변지영; 김장원; 장평우
- Fe-Si alloy; soft magnetic material; powder; core
- Issue Date
- ISAMMA 2010
- This paper describes a method to make Fe-Si alloy powders, one of representative soft magnetic alloys used for high-quality powder cores. The method was based on a modified pack-cementation process. The pack was a mixture composed of Fe, Si, NaF and Al2O3 powders. Al2O3 powders were added in order to prevent Fe and Si powders from sintering. When the mixture was held under the hydrogen atmosphere, H2, NaF and Si react each other to form various kinds of gaseous compounds contaiining H, Si, and F; SiF4, SiF3, SiF2, SiF, SiHF3, SiG2F2, SiG3F, SiH4, etc. The gaseous compounds move onto the surface of Fe powder through pores in the pack and are reduced to form Si on the surface. The Si deposited on its surface diffuses into Fe powder to make Fe-Si alloy powders. From the mixture reacted at high temperature above 850℃, Fe-Si alloy powders were separated using a magnet. In the separated powder some Al2O3 powders were included. These remaining Al2O3 powders could be leached out by an alkali patterns showing effect of the alkali treatment and a SEM image of the Fe-6wt.%Si alloy powders obtained from the powder mixture reacted at 900℃ for 24 hrs.
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