Hexagonal crystal system Y-type ferrite electromagnetic material and preparation method thereof

Abstract

The invention provides a hexagonal crystal system Y-type ferrite electromagnetic material and a preparation method thereof. The material is a Ba2Co2-xZnxFeyO22 (x is more than or equal to 0 and less than or equal to 2, and y is more than or equal to 10 and less than or equal to 14) ferrite material with hexagonal flaky morphology, and is obtained by uniformly mixing reactants and a reaction medium and calcining, wherein the reactants at least comprise a barium source, an iron source and a cobalt source; the reaction medium is one kind of chlorate or a mixture of two kinds of chlorate; the molar ratio of various elements in the reactants is that the ratio of Ba to Fe is 2:(10-14), and the ratio of Ba to Co is 2:(0-2); and the ratio of the mass of the reaction medium to the total mass of the reactants is (1-4):1. The invention has the advantages that the morphology of ferrite powder particles can be well controlled; inorganic molten salt is taken as the reaction medium, and the reactants are quickly dispersed and fully contacted in the molten salt by utilizing the dissolution of the reactants in the molten salt so as to reduce reaction temperature and improve reaction rate; the molten salt runs through generated barium ferrite particles in the reaction process, so the mutual agglomeration among the particles can be stopped; and the process is simple, the product is high in purity, the resultant temperature is low, the mechanical ball milling is not required, the doping is avoided, and the particle size distribution is narrow.

Description

technical field [0001] The invention relates to a hexagonal Y-type ferrite electromagnetic material and a preparation method thereof, specifically, Ba 2 co 2-x Zn x Fe y o 22 (0≤x≤2, 10≤y≤14) hexagonal ferrite material and its preparation method. Background technique [0002] The magnetoplumbite ferrite refers to the natural magnetoplumbite Pb(Fe 7.5 mn 3.5 al 0.5 Ti 0.5 )O 19 A class of ferrites with the same crystal structure, the chemical formula is MeFe 12 o 19 (M type), Me is a divalent metal ion Ba, Sr, Pb, etc., this type of ferrite belongs to the hexagonal D 1 6h (C6 / mmm), also known as hexagonal ferrite. It was first made by Phillips Laboratories in 1952 with BaFe 12 o 19 (M-type, BaM) as the main component of permanent magnetic materials, and then discovered BaMe 2 Fe 16 o 27 (Type W, Me 2 W), Ba 2 Me 2 Fe 12 o 22 (Type Y, Me 2 Y), Ba 3 Me 2 Fe 24 o 41 (Type Z, Me 2 Z), Ba 2 Me 2 Fe 28 o 46 (Type X, Me 2 X), Ba 4 Me 2 Fe 36 o 6...

AI Technical Summary

Problems solved by technology

[0006] (1) When mixing solid raw material powders, it is easy to cause uneven dispersion, and dissolving solid raw materials in a solution will increase the cost and cause too many influencing factors

[0007] (2) The calcination temperature is generally high temperature of 1050-1250°C, which easily leads to particle agglomeration or sintering

[0008] (3) The process is complicated

[0009] (4) In the fine grinding process, when the ball mill is mechanically crushed to below 1um, it takes a long time, and impurities are easily mixed in to change the composition and broaden the particle size distribution of the powder, etc.

[0010] (5) Due to the necessary fine grinding process, the particle shape cannot maintain a regular hexagonal sheet

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