公开(公告)号：US20250118471A1

公开(公告)日：2025-04-10

申请号：US18836537

申请日：2023-02-07

Applicant: TODA KOGYO CORP.

Inventor： Hidemi TSUKAMOTO ,  Kozo WATANABE ,  Hideharu MITSUI ,  Yasushi NISHIO

IPC: H01F1/34 ,  C01G49/00 ,  C08K3/22 ,  H05K9/00

Abstract: Provided is a ferrite particle powder for electromagnetic wave absorption that can maintain flexibility and uniformity of physical properties of a sheet even when the sheet is highly filled with the ferrite particle powder and is excellent in electromagnetic wave absorbing performance in a GHz band. The ferrite particle powder is a ferrite particle powder for electromagnetic wave absorption, the ferrite particle powder containing magnetoplumbite-type ferrite represented by a chemical formula of AxFe(12-y)(TizMn(1-z))yO19, where A is at least one selected from Ba, Sr, Ca, and Pb, x is 0.9 to 1.1, y is 5.0 or less, and z is 0.35 to 0.65, and the ferrite particle powder having: a compressed density of 3.00 g/cm3 or more; and an average particle diameter of 0.50 to 3.0 μm determined by an air permeability method (Blaine method).