MANUFACTURE OF HIGH-DENSITY MN-ZN FERRITE

PURPOSE:To provide a Mn-Zn ferrite of uniform magnetic characteristics without residual hematite or residual pores by sintering ferrite material with reducing agent in an inert atmosphere. CONSTITUTION:Materials for Mn-Zn ferrite, 62-68mol.% Fe2O3, 16-28mol.% MnO, and 10-16mol.% CoO, are mixed in a...

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Bibliographic Details
Main Authors YUGUCHI AKIYO, TOMITA MITSURU, KAWASAKI TOSHIHARU
Format Patent
LanguageEnglish
Published 02.12.1994
Edition5
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:PURPOSE:To provide a Mn-Zn ferrite of uniform magnetic characteristics without residual hematite or residual pores by sintering ferrite material with reducing agent in an inert atmosphere. CONSTITUTION:Materials for Mn-Zn ferrite, 62-68mol.% Fe2O3, 16-28mol.% MnO, and 10-16mol.% CoO, are mixed in a ball mill and baked in a nitrogen atmosphere. After CaO, SiO2, ZrO2 and CoO are added as additives, all the materials are pulverized in a ball mill. The resulting powder and a reducing agent are mixed at a ratio of 0.05-2.0% by weight in a mortar, and the mixture is compressed into a compact. After heated to 200 deg.C in a nitrogen atmosphere, the compact is sintered at 1200 deg.C in a nitrogen atmosphere containing 0.1% oxygen. This sinter is worked on a hot isostatic press, and then heat-treated.
Bibliography:Application Number: JP19930142834