Effect of Solid Reducing Agent of Si on Formative Condition of SrFe2-W Type Ferrite and Magnetic Properties

Ken Unno, Atsunori Kamegawa, Hitoshi Takamura, Motofumi Homma, Masuo Okada

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The W-type hexagonal ferrite, with the chemical formula of Sr(Ba)Fe2+2Fe3+16O27, is the future candidate ferrite because of its 10% higher saturation magnetization in comparing with that of M-type ferrites. A complicated atmosphere control during sintering process is, however, required in manufacturing of W-type ferrites, which will be unsuitable for industrial production. Recently, it is reported that a high performance SrFe2-W type ferrite can be produced with using a carbon powder as a solid reducing agent and controlling the drying temperature of green compacts. The energy product (BH)max of this SrFe2-W type ferrite is reported to be 5.3MGOe. The purpose of this study is to clarify the effects of drying treatment of green compacts, and addition of Si as a new solid reducing agent on the formative condition of SrFe2-W type ferrite. The drying treatment at 373K and following by firing at 1473K for 10 hours in PO2=250 Pa are the suitable formative conditions for silicon addition to achieve high volume fraction of SrFe2-W phase and this sample has the(BH)max of 10.3kJ·m-3.

Original languageEnglish
Pages (from-to)641-645
Number of pages5
JournalFuntai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
Volume45
Issue number7
DOIs
Publication statusPublished - 1998 Jul

Keywords

  • Drying treatment
  • Green compact
  • Reducing agent
  • Silicon
  • SrFe-W ferrites

ASJC Scopus subject areas

  • Mechanical Engineering
  • Industrial and Manufacturing Engineering
  • Metals and Alloys
  • Materials Chemistry

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