| 摘要 |
PURPOSE:To provide an oxide magnetic material, strength of which against low-load prolonged-term stress is improved without deteriorating electromagnetic characteristics. CONSTITUTION:Not more than 100ppm P (except 0ppm) and not more than 3000ppm TiO2 (except 0ppm) are comprised in manganese zinc ferrite containing 30-200ppm SiO2 and 250-900ppm CaO in the oxide magnetic material. Since manganese zinc ferrite containing these substances at someratio has a composition belonging to a high-permeability composition range, the initial permeability of a magnetic core is not deteriorated. P and TiO2 at each ratio are comprised in the manganese zinc ferrite, thus increasing strength against low-load prolonged-term stress. |
