Enveloping Fe?12%Al atomized powders in selectively-oxidized insulating films for soft magnetic composite (SMC) cores

Title
Enveloping Fe?12%Al atomized powders in selectively-oxidized insulating films for soft magnetic composite (SMC) cores
Authors
변지영김상훈최광덕장평우윤우영
Keywords
Soft magnetic composites; Oxide insulation; Selective oxidation
Issue Date
2021-02
Publisher
Journal of alloys and compounds
Citation
VOL 854, 157241
Abstract
Fe-12 wt%Al gas atomized powders were enveloped in a uniform Al2O3-containing oxide film by heat-treatment of a mixture of Fe?Al and Mg(OH)2 powders at 900 °C for 1 h in static hydrogen atmosphere. In this novel method using a semi-closed system without adding any oxidants, water vapor generated by decomposition of Mg(OH)2 was used as an oxidant to selectively oxidize aluminum in the Fe-12 wt%Al alloy. Most of the generated water vapor was consumed to form the Al2O3 film and the thickness of the insulating film could be controlled in the tens of nanometers range by controlling the amount of added Mg(OH)2 in the mixture. Fe?12%Al powders enveloped in around 50 nm thick oxide films could be applied to make reasonably high-performance soft magnetic composite cores, because the high temperature heat-treatment up to 900 °C was possible and hence easily relieved the strain energy generated when shaping the cores.
URI
http://pubs.kist.re.kr/handle/201004/73110
ISSN
0925-8388
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KIST Publication > Article
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