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    • 6. 发明授权
    • Oxide magnetic material
    • 氧化物磁性材料
    • US5518642A
    • 1996-05-21
    • US314546
    • 1994-09-28
    • Osamu InoueNobuya MatsutaniKoichi KugimiyaOsamu IshiiYasuyuki Aono
    • Osamu InoueNobuya MatsutaniKoichi KugimiyaOsamu IshiiYasuyuki Aono
    • C04B35/26C04B35/38
    • C04B35/2658
    • An oxide magnetic material provided by the present invention contains, as main components, 55 to 59 mol % of Fe.sub.2 O.sub.3 ; 35 to 42 mol % of MnO; and 6 mol % or less of ZnO, and further contains, as sub-components, 0.05 to 0.3 wt % of CaO; and 0.005 to 0.05 wt % of SiO.sub.2. The other oxide magnetic material provided by the present invention contains, as main components, 61 to 67 mol % of Fe.sub.2 O.sub.3 ; 3 to 36 mol % of MnO; and 30 mol % or less of ZnO, and further contains, as sub-components, 0.05 to 0.5 wt % of CaO; and 0.005 to 0.2 wt % of SiO.sub.2. Such materials can further contain one or more kinds of oxides selected from the group consisting of ZrO.sub.2, HfO.sub.2, Ta.sub.2 O.sub.5, Cr.sub.2 O.sub.3, MoO.sub.3, WO.sub.3, Al.sub.2 O.sub.3, Ga.sub.2 O.sub.3, In.sub.2 O.sub.3, GeO.sub.2, SnO.sub.2, Sb.sub.2 O.sub.3 and Bi.sub.2 O.sub.3. Such magnetic materials of the present invention have the advantages of having an extremely low magnetic loss even when used in the high frequency band and having a minimum magnetic loss at a temperature sufficiently higher than room temperature. Moreover, a switching power supply having a switching frequency of 300 kHz to 5 MHz is provided by using such magnetic materials as a magnetic core.
    • 本发明提供的氧化物磁性材料含有55〜59摩尔%的Fe 2 O 3作为主要成分; 35〜42mol%的MnO; 和6mol%以下的ZnO,作为副成分,进一步含有0.05〜0.3重量%的CaO; 和0.005〜0.05重量%的SiO 2。 本发明提供的其它氧化物磁性材料以Fe 2 O 3为主要成分为61〜67摩尔%。 3〜36摩尔%的MnO; 和30摩尔%以下的ZnO,作为副成分,进一步含有0.05〜0.5重量%的CaO; 和0.005〜0.2重量%的SiO 2。 这些材料可以进一步含有选自ZrO 2,HfO 2,Ta 2 O 5,Cr 2 O 3,MoO 3,WO 3,Al 2 O 3,Ga 2 O 3,In 2 O 3,GeO 2,SnO 2,Sb 2 O 3和Bi 2 O 3中的一种以上的氧化物。 本发明的这种磁性材料具有即使在高频带下使用也具有非常低的磁损耗并且在足够高于室温的温度下具有最小的磁损耗的优点。 此外,通过使用这种磁性材料作为磁芯,提供具有300kHz至5MHz的开关频率的开关电源。