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

K. D. Choi; S. H. Kim; P. W. Jang; W. Y. Yoon; J. Y. Byun

doi:10.1016/j.jallcom.2020.157241

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

K. D. Choi, S. H. Kim, P. W. Jang, W. Y. Yoon, J. Y. Byun

Department of Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

13 Citations (Scopus)

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.

Original language	English
Article number	157241
Journal	Journal of Alloys and Compounds
Volume	854
DOIs	https://doi.org/10.1016/j.jallcom.2020.157241
Publication status	Published - 2021 Feb 15

Keywords

Fe-12 wt%Al alloy
Oxide insulation
Selective oxidation
Soft magnetic composites (SMCs)

ASJC Scopus subject areas

Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

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title = "Enveloping Fe–12%Al atomized powders in selectively-oxidized insulating films for soft magnetic composite (SMC) cores",

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.",

keywords = "Fe-12 wt%Al alloy, Oxide insulation, Selective oxidation, Soft magnetic composites (SMCs)",

author = "Choi, {K. D.} and Kim, {S. H.} and Jang, {P. W.} and Yoon, {W. Y.} and Byun, {J. Y.}",

note = "Funding Information: This work was supported by an internal project of Korea Institute of Science and Technology ( 2E30710 ) and the National Research Council of Science & Technology (NST) grant by the Korea government ( MSIT ) (No. CAP-16-10-KIMS ). Publisher Copyright: {\textcopyright} 2020 Elsevier B.V.",

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AU - Choi, K. D.

AU - Kim, S. H.

AU - Jang, P. W.

AU - Yoon, W. Y.

AU - Byun, J. Y.

N1 - Funding Information: This work was supported by an internal project of Korea Institute of Science and Technology ( 2E30710 ) and the National Research Council of Science & Technology (NST) grant by the Korea government ( MSIT ) (No. CAP-16-10-KIMS ). Publisher Copyright: © 2020 Elsevier B.V.

PY - 2021/2/15

Y1 - 2021/2/15

N2 - 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.

AB - 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.

KW - Fe-12 wt%Al alloy

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KW - Selective oxidation

KW - Soft magnetic composites (SMCs)

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

Abstract

Keywords

ASJC Scopus subject areas

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