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

作者：Byun Ji Young^*; Kim Jang Won; Han Jeong Whan; Jang Pyungwoo

来源：Metals and Materials International, 2013, 19(2): 267-271.

DOI：10.1007/s12540-013-2022-1

• magnetic materials
• chemical synthesis
• powder processing
• diffusion
• compressed core

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.

• 出版日期2013-3