FERRITE MATERIAL, PRODUCTION THEREOF AND DEFLECTION YOKE CORE EMPLOYING FERRITE MATERIAL

摘要

PROBLEM TO BE SOLVED: To provide an Mn-Zn based ferrite material having high resistance, high permeability and a small core loss at low cost, a production method thereof and a deflection yoke coil employing the Mn-Zn based ferrite material. ;SOLUTION: The ferrite material principally comprises 43.0-49.5mol.% of Fe₂O₃, 33.5-49.0mol.% of MnO and 8.0-17.0mol.% of ZnO wherein the ration of ZnOmol.%/Fe₂O₃mol.% is 0.35 or less. Preferably, the ferrite material is admixed with at least one subcomponent of 0.006-0.12wt.% of CaO, 0.001-0.05wt.% of SiO₂ and 0.1-1.0wt.% of Bi₂O₃. In the method for producing a deflection yoke core, oxygen concentration is set at 3-13% at the time of sintering a deflection yoke core and the cooling rate after sintering is preferably set at 120°C/h-400°C/h down to 500°C.;COPYRIGHT: (C)1998,JPO