Influence of Fabrication Process on Magnetic Properties of Co-Finemet Nanocrystalline Powder Core

Abstract:

Abstract. Rapidly quenched ribbons of Fe_63.5Co₁₀Si_13.5B₉Cu₁Nb₃ alloy were annealed at 550°C in a vacuum for 1h and milled to powders. Cold-pressed nanocrystalline powder cores were fabricated using 1-5wt.% of epoxy E-44 as the binder and 1wt.% of Zn-stearate for lubrication under the pressure 155-200KN. The microstructure and morphology of powders were characterized with XRD and SEM. The effective permeability (μe) and quality factor (Q) were tested by using LCR HiTESTER 3532-50 in the range of 1–5000 kHz. The results show that the μe of the powder cores increased with the particle size. Powder cores with 2wt.% binder exhibited higher μe, but lower Q compared with samples with 3wt.% binder. Increase of the forming pressure helps improve μe, but the excessive stress caused by the forming pressure had a negative effect for μe.

• Periodical: Advanced Materials Research (Volumes 399-401)
• Pages: 1008-1011
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.399-401.1008
• Online since: November 2011
• Authors: Zhen Wang, Jing Liu, Ru Wu Wang, Jia Kun Min, Zhi Hong Lu, Zhang Hua Gan, Li Xia Fan
• Keywords: Magnetic Powder Core, Nanocrystalline, Permeability, Quality Factor

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