| 摘要 |
PURPOSE:To improve shock resistance and polishing work cap ability by mixing a specified amount of sodium oxide or dibanadium pentaoxide and of sodium oxide into manganese zinc ferrite containing specified amount of silicon dioxide, calcium oxide and niobium pentoxide. CONSTITUTION:An oxide magnetic material is formed by mixing at least 200-1300 ppm as the total amount of sodium oxide 180-600 ppm or dibanadium pentoxide and sodium oxide into the mother material of manganese zinc ferrite containing silicon dioxide 50-250 ppm, calcium oxide 250-1000 ppm and niobium pentoxide 50-500 ppm. Thereby, shock resistance and polishing workability may be improved without deterioration of electromagnetic characteristics. |
