발간논문

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Vol.18, No.5, 357 ~ 364, 1980
Title
A Study on the magnetic Properties and microstructures of High Silicon Steel Core materials
송진태Jin Tae Song, 권종상Jong Sang Kwon
Abstract
Magnetic properties and hardness of sintered cores made of Fe-Si alloy powder containing high silicon were studied and the mechanism bringing about their characteristics is examined by metallographic methods. Fe-6.5%Si powders with different particle sizes were compacted under pressures of 8∼9ton//㎠ and sintered at 1250℃∼1400℃ in hydrogen atmosphere. The magnetic properties of Fe-6.5%Si sintered cores were improved with increasing the green density of core and sintering temperature. Especially, coercive force and hardness of sintered cores compared favorably with compressed iron powder cores and were almost comparable to electrial steel sheets. It may be concluded that the higher the density the better the magnetic properties of compacted core, high temperature sintering provides further improvement to them, and their mechanism is attributed to the elimination of porosity and the coarse-grained microstructures. Therefore, it seems that density (or porosity) is the predominant factor controlling magnetic properties and mechanical properties of compacted core.
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