Bulk amorphous powder cores with low core loss by spark-plasma sintering Fe76Si9.6B8.4P6 amorphous powder with small amounts of SiO2

Xue Li, Gonghao Lu, Zhiqiang Zhang, Dongying Ju, Akihiro Makino

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


Fe76Si9.6B8.4P6 amorphous powder was produced by gas atomization. Next, bulk amorphous powder discs were prepared by pressing a mixture of Fe76Si9.6B8.4P6 amorphous powder and a small amount of SiO2 powder using the spark plasma sintering technique. The resulting bulk amorphous powder cores were obtained from the compacted discs using an electrical spark erosion machine. The powder core with 5 mass% SiO2 shows both high saturation magnetization of 1.41 T and good soft magnetic properties, 23 A/m for coercive force and 117 for effective permeability at 1 kHz. The core also exhibits much lower core loss than silicon steels or the powder core without SiO2, only 71 W/kg at a maximum magnetic induction of 0.2 T with a frequency of 10 kHz. The low core loss is due to a SiO2 insulator layer forming on the surface of the alloy powder that can effectively reduce the eddy current and consequently reduce the core loss.

Original languageEnglish
Pages (from-to)917-920
Number of pages4
JournalJournal of Alloys and Compounds
Publication statusPublished - 2015 Jul 6


  • Amorphous alloy
  • Core loss
  • Powder core
  • Soft magnetic property
  • Spark plasma sintering

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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