HIGH-STRENGTH MAGNETIC MATERIAL AND MANUFACTURE THEREOF

PURPOSE:To obtain a high-strength magnetic material having a high Q value and density from Ni-Zn ferrite by using at least one or more of Bi2O3, PbO, V2O5 as additives and adding the additives separately before and after calcination. CONSTITUTION:At least one or more of Bi2O3, PbO, and V2O5 are adde...

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Bibliographic Details
Main Author TANAKA MUNEYUKI
Format Patent
LanguageEnglish
Published 18.04.1990
Subjects
ARTIFICIAL STONE
BASIC ELECTRIC ELEMENTS
CEMENTS
CERAMICS
CHEMISTRY
COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS
CONCRETE
ELECTRICITY
INDUCTANCES
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 obtain a high-strength magnetic material having a high Q value and density from Ni-Zn ferrite by using at least one or more of Bi2O3, PbO, V2O5 as additives and adding the additives separately before and after calcination. CONSTITUTION:At least one or more of Bi2O3, PbO, and V2O5 are added separately before and after calcination. Since all of the Bi2O3, PbO, and V2O5 are low in melting point as compared with other oxides, they accelerate the sintering of ferrite. When the additives are added even after the calcination, the additives can be distributed widely among crystals and the effect of the sintering can be improved. Moreover, by constructing the crystalline texture of the sintered body in a state where small and large-sized crystals are mixed, formation of cracks in the sintered body becomes complicated and the destroying energy can be dispersed. As a result, the strength of the sintered body can be improved. Therefore, a magnetic material having a sufficiently practical Q value and high strength can be obtained without raising the sintering temperature especially.
Bibliography:Application Number: JP19880259082