High permeability magnetic sheet

Patent metadata

Field	Value
Publication number	US-10593453-B2
Application number	US-201715657463-A
Country	US
Kind code	B2
Filing date	Jul 24, 2017
Priority date	Jul 25, 2016
Publication date	Mar 17, 2020
Grant date	Mar 17, 2020

Abstract

A magnetic sheet comprises, by vol. %, Fe—Si—Al alloy flat powder: 36% or more. The Fe—Si—Al alloy flat powder comprises, by wt %, 9.3%≤Si≤9.7%, 5.7%≤Al≤6.1%, and remaining Fe. The Fe—Si—Al alloy flat powder has: an aspect ratio in a range of 20 or more and 50 or less; a 50% particle size D50 in a range of 50 μm or more and 100 μm or less; and a coercivity Hc of 60 A/m or less. The magnetic sheet has a temperature characteristic of permeability μ′ measured at 1 MHz exhibiting a maximum value in a range of 0° C. or more and 40° C. or less.

First claim

The invention claimed is:

1. A magnetic sheet comprising, by vol. %, Fe—Si—Al alloy flat powder: 36% or more, the Fe—Si—Al alloy flat powder (i) comprising, by wt %, 9.40≤Si≤9.65, 5.7%≤Al≤6.1%, and remaining Fe, and (ii) having:
an aspect ratio in a range of 20 or more and 50 or less;
a 50% particle size D 50 in a range of 50 μm or more and 100 μm or less; and
a coercivity Hc of 60 A/m or less,
wherein the magnetic sheet has a temperature characteristic of permeability μ′ measured at 1 MHz exhibiting a maximum value in a range of 0° C. or more and 40° C. or less.

Assignees

• Tdk Corp

Inventors

• Matsukawa Atsuhito
• Honjo Yoshihiro
• Matsuhashi Mitsuhiro

Classifications

• H01F1/26

  by macromolecular organic substances · CPC title

• H01F1/14791 Primary

  Fe-Si-Al based alloys, e.g. Sendust · CPC title

• C22C2202/02

  Magnetic · CPC title

• B22F2301/35

  Iron · CPC title

• B29K2105/18

  oriented · CPC title