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Preparation method of ultrafine ferrite powder

A technology of ferrite and ferrite, which is applied in the field of preparation of ultrafine ferrite powder, can solve the problems of reduced particle size of ferrite powder, insufficient magnetic force of blank, sintering and adhesion, etc., and achieves improvement of initial magnetic permeability. and resistivity, improving magnetic properties, and refining grains

Active Publication Date: 2020-02-21
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome that in the prior art, the calcined material is slowly cooled with the furnace and directly ball milled, the particle size and surface activity of the prepared ferrite powder still need to be improved, and the ferrite blank obtained by sintering after pressing It is easy to cause the problems of insufficient magnetic force, sintering adhesion, and sintering cracking of the billet. A preparation method for ultra-fine ferrite powder is provided. The particle size of the prepared ferrite powder is greatly reduced, and the surface activity is high, so it can improve the ferrite powder. Improve the magnetic properties of the body blank, reduce the shrinkage of the ferrite blank during final sintering, and improve the product yield

Method used

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  • Preparation method of ultrafine ferrite powder

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] A preparation method of ultrafine ferrite powder, comprising the steps of:

[0061] (1) 69.75% Fe by weight 2 o 3 , 23% Mn 3 o 4 , 7.25% ZnO to prepare 400kg MnZn power ferrite DMR44 raw material, after mixing evenly, put the raw material into the rotary kiln and pre-fire at 980°C for 3 hours to obtain high-temperature pre-fired material;

[0062] (2) The high-temperature calcined material is directly dropped into 320kg of cooling medium (concentration is 0.06wt% lime water) for rapid cooling, and after cooling for 5min, coarse pulverized slurry is obtained;

[0063] (3) Coarse crushing slurry and auxiliary material SiO 2 and Nb 2 o 5 Pour into sand mill together and carry out secondary grinding 90 minutes (material: ball=1:6), obtain ferrite slurry, wherein SiO 2 and Nb 2 o 5 The concentration in the ferrite slurry is 0.003wt% and 0.03wt%;

[0064] (4) The ferrite slurry is spray-dried to obtain superfine ferrite powder.

Embodiment 2

[0066] A preparation method of ultrafine ferrite powder, comprising the steps of:

[0067] (1) 69.75% Fe by weight 2 o 3 , 23% Mn 3 o 4 , 7.25% ZnO to prepare 400kg MnZn power ferrite DMR44 raw material, after mixing evenly, put the raw material into the rotary kiln and pre-fire at 950°C for 4 hours to obtain high-temperature pre-fired material;

[0068] (2) The high-temperature calcined material is directly dropped into 320kg of cooling medium (concentration is 0.06wt% lime water) for rapid cooling, and after cooling for 3min, coarse pulverized slurry is obtained;

[0069] (3) Coarse crushing slurry and auxiliary material SiO 2 , Nb 2 o 5 and ZrO 2Pour into sand mill together and carry out secondary grinding 90 minutes (material: ball=1:6), obtain ferrite slurry, wherein SiO 2 , Nb 2 o 5 and ZrO 2 The concentration in the ferrite slurry is 0.003wt%, 0.03wt% and 0.03wt%;

[0070] (4) The ferrite slurry is spray-dried to obtain superfine ferrite powder.

Embodiment 3

[0072] A preparation method of ultrafine ferrite powder, comprising the steps of:

[0073] (1) 69.75% Fe by weight 2 o 3 , 23% Mn 3 o 4 , 7.25% ZnO to prepare 400kg MnZn power ferrite DMR44 raw material, after mixing evenly, put the raw material into the rotary kiln and pre-fire at 1050°C for 2 hours to obtain high-temperature pre-fired material;

[0074] (2) The high-temperature pre-fired material is directly dropped into 320kg of cooling medium (concentration is 0.06wt% lime water) for rapid cooling, and after cooling for 10min, coarse pulverized slurry is obtained;

[0075] (3) Coarse crushing slurry and auxiliary material SiO 2 , Nb 2 o 5 and ZrO 2 Pour into sand mill together and carry out secondary grinding 90 minutes (material: ball=1:6), obtain ferrite slurry, wherein SiO 2 , Nb 2 o 5 and ZrO 2 The concentration in the ferrite slurry is 0.005wt%, 0.02wt% and 0.02wt%;

[0076] (4) The ferrite slurry is spray-dried to obtain superfine ferrite powder.

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Abstract

The invention relates to the field of ultrafine powder preparation and discloses a preparation method of ultrafine ferrite powder. The preparation method comprises the steps that (1) the raw materialferrite is pre-sintered under the temperature of 950-1,050 DEGC to obtain a high-temperature pre-sintered material; (2) the high-temperature pre-sintered material is directly placed into a cooling medium, and roughly smashed paste is obtained after cooling; (3) the roughly smashed paste is subjected to secondary grinding together with auxiliary materials to obtain ferrite paste; and (4) the ferrite paste is subjected to spray drying to obtain the ultrafine ferrite powder. According to the preparation method, since the high-temperature per-sintered material is directly placed into the cooling medium, on the one hand, the high-temperature per-sintered material can be quickly cooled, and the situation that effective magnetic components are excessively oxidized is avoided; and on the other hand, rough smashing of the high-temperature per-sintered material is realized, quick cooling and rough smashing of the high-temperature per-sintered material can be performed simultaneously, cooling time is shortened, a rough grinding step is omitted, all properties of the ferrite powder can be improved, and production efficiency is improved.

Description

technical field [0001] The invention relates to the field of ultrafine powder preparation, in particular to a preparation method of ultrafine ferrite powder. Background technique [0002] Ferrite generally refers to the composite oxide of iron group and one or more other suitable metal elements. In terms of its conductivity, it is a semiconductor, but it is used as a magnetic medium in application. Ferrite can be divided into seven types according to its lattice type: spinel type, garnet type, magnetoplumbite type, perovskite type, ilmenite type, sodium chloride type, and rutile type. According to its characteristics and uses, it can be divided into five categories: soft magnetism, permanent magnetism, absolute magnetism, moment magnetism, and piezoelectric magnetism. Due to its abundant raw materials, low manufacturing cost, and stable performance, it is widely used in various fields such as magnetic recording, microwave absorption, magnetic separation, magnetic sealing, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/38H01F1/36H01F1/11H01F41/02C04B35/64C04B35/626
CPCC04B35/2633C04B35/2658C04B35/6261C04B35/64C04B2235/3208C04B2235/3244C04B2235/3251C04B2235/3418C04B2235/442C04B2235/95C04B2235/96H01F1/11H01F1/344H01F1/36H01F41/0246H01F41/0266
Inventor 陈新彬
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD
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