Title:
MN-ZN FERRITE MAGNETIC MATERIAL HAVING HIGH ELECTRIC RESISTANCE SURFACE LAYER AND MANUFACTURE THEREOF
Document Type and Number:
Japanese Patent JP3242748
Kind Code:
B2
Abstract:
PURPOSE: To provide an Mn-Zn ferrite magnetic material having high electric resistance surface layer.
CONSTITUTION: The Mn-Zn ferrite magnetic material comprising 20-50 mol% of MnO, 5-40mol% of ZnO and the residual mol% of Fe2O3 is to be used. The magnetic material having high electric resistance surface layer is manufactured either by simultaneously coating said Mn-Zn magnetic material with one or exceeding two kinds of compounds out of Li compound and the compounds of Ti, Cr, Co, Ni, Cu and Zn or by burying said Mn-Zn ferrite magnetic material in the blended particles of said compounds to be heat-treated within the temperature range of 600°C-1400°C. Through these procedures, the Mn-Zn ferrite magnetic material having high electric resistance surface layer is provided with the resistivity exceeding 108Ω.m thereby enabling it to be used as a deflection yoke core. Furthermore, both direct winding inductors and transformers having no bobbins at all can be manufactured by using the polarized yoke cores.
Inventors:
Norima Sasaki
Kaoru Ito
Kaoru Ito
Application Number:
JP11298693A
Publication Date:
December 25, 2001
Filing Date:
May 14, 1993
Export Citation:
Assignee:
TDK Co., Ltd.
International Classes:
C01G49/00; C04B35/38; H01F1/34; H01F3/08; (IPC1-7): H01F1/34; C01G49/00; C04B35/38
Domestic Patent References:
| JP6275420A | ||||
| JP521223A | ||||
| JP412503A | ||||
| JP536515A | ||||
| JP3242907A | ||||
| JP63260883A | ||||
| JP371603A | ||||
| JP6158859A |
Attorney, Agent or Firm:
Kazuo Sato (3 others)