FERRITE CORE, ELECTRONIC COMPONENT AND POWER SUPPLY DEVICE

PROBLEM TO BE SOLVED: To provide a ferrite core high in saturation magnetic flux density near 100°C and high in core strength.SOLUTION: There is provided a MnZn-based ferrite which contains iron oxide of 64.0 to 72.5 mol% in terms of FeO, zinc oxide of 7.5 to 20.0 mol% in terms of ZnO, nickel oxide...

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Bibliographic Details
Main Authors YONEZAWA HIROSHI, YASUHARA KATSUSHI, SAITA ATSUSHI, TAKANE SUSUMU
Format Patent
LanguageEnglish
Japanese
Published 23.06.2016
Subjects
ARTIFICIAL STONE
BASIC ELECTRIC ELEMENTS
CEMENTS
CERAMICS
CHEMISTRY
COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS
COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F
CONCRETE
ELECTRICITY
INDUCTANCES
INORGANIC CHEMISTRY
LIME, MAGNESIA
MAGNETS
METALLURGY
REFRACTORIES
SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
SLAG
TRANSFORMERS
TREATMENT OF NATURAL STONE
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Summary:PROBLEM TO BE SOLVED: To provide a ferrite core high in saturation magnetic flux density near 100°C and high in core strength.SOLUTION: There is provided a MnZn-based ferrite which contains iron oxide of 64.0 to 72.5 mol% in terms of FeO, zinc oxide of 7.5 to 20.0 mol% in terms of ZnO, nickel oxide of 0.01 to 5.0 mol% in terms of NiO and the balance manganese oxide with a first accessory component containing calcium oxide of 200 to 3000 ppm in terms of CaCOand silicon oxide of 50 to 300 ppm in terms of SiO, is a polycrystalline material having a spinel structure, where grain boundary thereof consists amorphous materials, Ca/Si ratio X at a point A where the Ca concentration of the grain boundary is maximum satisfies the formula (1) and Ca/Si ratio Y at a point B with 5 nm from the point A of the grain boundary into a crystal particle satisfies the formula (2). 0.5≤X≤1.0 Formula (1) X+0.05≤Y≤X+0.5 Formula (2), where X, Y=Ca concentration (at%)/Si concentration (at%).SELECTED DRAWING: Figure 1 【課題】１００℃近傍における飽和磁束密度が高く、かつ、コア強度の高いフェライトコアの提供。【解決手段】酸化鉄をＦｅ２Ｏ３換算で６４．０〜７２．５ｍｏｌ％、酸化亜鉛をＺｎＯ換算で７．５〜２０．０ｍｏｌ％、酸化ニッケルをＮｉＯ換算で０．０１〜５．０ｍｏｌ％、残部が酸化マンガンからなり、第１副成分が酸化カルシウムをＣａＣＯ３換算で２００〜３０００ｐｐｍ、酸化ケイ素をＳｉＯ２換算で５０〜３００ｐｐｍ含むＭｎＺｎ系フェライトであって、スピネル構造を有する多結晶体であり、その粒界が非晶質からなり、粒界のＣａ濃度が最大となる点ＡにおけるＣａ／Ｓｉ比Ｘが式（１）を満たし、かつ、粒界の点Ａから結晶粒子内へ５ｎｍの点ＢにおけるＣａ／Ｓｉ比Ｙが式（２）を満たすフェライトコア。０．５≦Ｘ≦１．０...式（１）Ｘ＋０．０５≦Ｙ≦Ｘ＋０．５...式（２）［Ｘ、Ｙ＝Ｃａ濃度（ａｔ％）／Ｓｉ濃度（ａｔ％）］【選択図】図１
Bibliography:Application Number: JP20140253866