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Sintered powder cores of high B s and low coreloss Fe84.3Si4B8P3Cu0.7 nano-crystalline alloy
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/content/aip/journal/adva/3/6/10.1063/1.4811465
2013-06-12
2014-11-27

Abstract

Nano-crystalline Fe-rich FeSiBP Cu alloy ribbon with saturation magnetic flux density ( ) close to Si-steel exhibits much lower core loss ( ) than Si-Steels. Low glass forming ability of this alloy limits fabrication of magnetic cores only to stack/wound types. Here, we report on fabrication, structural, thermal and magnetic properties of bulk FeSiBP Cu cores. Partially crystallized ribbons (obtained after salt-bath annealing treatment) were crushed into powdered form (by ball milling), and were compacted to high-density (∼88%) bulk cores by spark plasma sintering (SPS). Nano-crystalline structure (consisting of α-Fe grain in remaining amorphous matrix) similar to wound ribbon cores is preserved in the compacted cores. At 50 Hz, cores sintered at = 680 K show < 10 W/kg ( = 50 Hz, ∼1 T). Coating/mixing of powders with an insulating agent like SiO is shown to be effective in further reduction of at > 1 kHz. A trade-off between porosity and electrical resistivity is necessary to get low at higher . In the range of ∼1 to 100 kHz, we have shown that the cores mixed with SiO exhibit much lower than Fe-powder cores, non-oriented Si-steel sheets and commercially available sintered cores. We believe our core material is very promising to make power electronics/electrical devices much more energy-efficient.

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Scitation: Sintered powder cores of high Bs and low coreloss Fe84.3Si4B8P3Cu0.7 nano-crystalline alloy
http://aip.metastore.ingenta.com/content/aip/journal/adva/3/6/10.1063/1.4811465
10.1063/1.4811465
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