Ferrite magnetic material, ferrite magnet, and ferrite sintered magnet

US8591760B2 · kind B2 · utility

Assignee

• TDK CORPORATION · JP

Inventors

• Shigeki Yanagida · Chuo, JP
• Takahiro Mori · Higashimurayama, JP
• Hiroyuki Morita · Ebina, JP
• Nobuhiro Suto · Tokyo, JP
• Tatsuya Katoh · Ebina, JP
• Yoshihiko Minachi · Tokyo, JP

Key dates

• Filing date: Mar 15, 2011
• Grant date: Nov 26, 2013
• Expiry date: Mar 15, 2031

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C04B2235/788
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A ferrite magnet and a ferrite sintered magnet including a ferrite magnetic material are provided. A main phase of the ferrite magnetic material includes a ferrite phase having a hexagonal crystal structure, and metal element composition expressed by Ca1-w-x-yR wSr xBayFezMm wherein 0.25<w<0.5, 0.01<x<0.35, 0.0001<y<0.013, y<x, 8.7<z<9.9, 1.0<w/m<2.1, 0.017<m/z<0.055 and Si component is at least included as a sub-component, and wherein; when content y1 mass % of the Si component in the ferrite magnetic material, with respect to SiO2, is shown on Y-axis and a total content x1 of z and m is shown on X-axis, a relation between x1 and y1 is within a range surrounded by 4 points placed on X-Y coordinate having the X and Y axes.