Low cost permanent magnetic ferrite and preparation method thereof

A permanent magnet ferrite, low-cost technology, used in inductor/transformer/magnet manufacturing, inorganic material magnetism, electrical components, etc., can solve problems such as inability to meet, and achieve increased product density, refined grains, and high magnetic properties. The effect of academic performance

Active Publication Date: 2017-11-10
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the improvement of the magnetic properties of ferrite prepared by this method is limited, and it still cannot meet the current society's requirements for miniaturization and high performance of magnetic materials. Although its raw material components have been adjusted, its magnetic properties, such as residual magnetic induction Magnetic performance parameters such as Br (about 4000Gs) and intrinsic coercive force Hcj (about 4000Oe) still cannot meet the existing needs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A low-cost permanent magnet ferrite whose main phase is Sr 0.95 La 0.05 Fe 10.58 co 0.02 o 19 .

[0042] A preparation method of low-cost permanent magnet ferrite, comprising the following steps:

[0043] a) Material preparation: press Sr 0.95 La 0.05 Fe 10.58 co 0.02 o 19 The stoichiometric ratio of each element in the raw material is weighed;

[0044] b) Pulverization: The above-mentioned raw materials are wet-mixed and ball-milled, so that the median particle size D of the raw materials after ball-milling is 50 It is 0.70 micron, and drying after ball milling makes compound powder;

[0045] c) Calcination: pre-compress the compounded powder under a pressure of 8Mpa, and heat it at 1200°C for 1 hour to obtain a block calcined material, and crush the block calcined material to a median particle size D 50It is 3.0 microns, and the pre-burned fine powder is obtained;

[0046] d) Ingredients: Based on the total weight of pre-burned fine powder and red materia...

Embodiment 2

[0052] A low-cost permanent magnet ferrite whose main phase is Sr 0.75 (La 0.9 PR 0.1 ) 0.25 Fe 11.75 (Co 0.9 Zn 0.1 ) 0.25 o 19 .

[0053] A preparation method of low-cost permanent magnet ferrite, comprising the following steps:

[0054] a) Material preparation: press Sr 0.75 (La 0.9 PR 0.1 ) 0.25 Fe 11.75 (Co 0.9 Zn 0.1 ) 0.25 o 19 The stoichiometric ratio of each element in the raw material is weighed; b) crushing: the above-mentioned raw material is wet-mixed and ball-milled, so that the median particle size of the raw material after ball-milling is D 50 It is 0.75 microns, and the mixed powder is obtained by drying after ball milling;

[0055] c) Calcination: pre-compress the compounded powder under a pressure of 10Mpa, and keep it warm at 1250°C for 3 hours to obtain a block calcined material, and crush the block calcined material to a median particle size D 50 It is 3.5 microns, and the pre-burned fine powder is obtained;

[0056] d) Ingredients: Ba...

Embodiment 3

[0062] A low-cost permanent magnet ferrite whose main phase is Sr 0.5 (La 0.5 PR 0.5 ) 0.5 Fe 11.7 (Co 0.9 Zn 0.1 ) 0.5 o 19 .

[0063] A preparation method of low-cost permanent magnet ferrite, comprising the following steps:

[0064] a) Material preparation: press Sr 0.5 (La 0.5 PR 0.5 ) 0.5 Fe 11.7 (Co 0.9 Zn 0.1 ) 0.5 o 19 The stoichiometric ratio of each element in the raw material is weighed;

[0065] b) Pulverization: The above-mentioned raw materials are wet-mixed and ball-milled, so that the median particle size D of the raw materials after ball-milling is 50 0.80 microns, dried after ball milling to obtain compound powder;

[0066] c) Calcination: pre-compress the compounded powder under a pressure of 12Mpa, and keep it warm at 1300°C for 4 hours to obtain a block calcined material, and crush the block calcined material to a median particle size D 50 3 to 4.0 microns to prepare pre-fired fine powder;

[0067] d) Ingredients: Based on the total we...

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Abstract

The invention belongs to the technical field of magnetic materials and preparation thereof. The invention discloses a low cost permanent magnetic ferrite with a main phase of A1-XRxFe2n-YTyO19; the invention also discloses a preparation method of the low cost permanent magnetic ferrite, and in the preparation process of the permanent magnetic ferrite, certain content of a red material is added into a pre-sintered material. The low cost permanent magnetic ferrite has higher magnetic performance, can adapt to the miniaturization, high magnetic performance and other trend of electronic components in the prior art; in the preparation method, the certain content of the red material is added into the pre-sintered material to increase the density of the product and refine grains, and the magnetic properties of the material can be improved to a great extent.

Description

technical field [0001] The invention relates to the technical field of magnetic materials and preparation thereof, in particular to a low-cost permanent magnet ferrite and a preparation method thereof. Background technique [0002] Hexagonal M-type (magnetoplumbite-type) Sr ferrite and Ba ferrite are known as permanent magnet materials made of oxides. Ferrite magnetic materials formed from these ferrites are supplied as permanent ferrite sintered bodies or bonded permanent magnets. In recent years, with the development of miniaturization and high performance of electronic components, permanent magnet ferrite materials are also required to be miniaturized and have high magnetic properties. Generally speaking, the magnetic indexes of permanent magnet ferrite mostly use residual magnetic flux density (Br) and intrinsic coercive force (Hcj), and the higher these two indexes are considered to have higher magnetic properties. Starting from how to improve the Br and Hcj of the pe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/26C04B35/622C04B35/626H01F1/11H01F41/02
CPCC04B35/26C04B35/622C04B35/62645C04B2235/3208C04B2235/3213C04B2235/3227C04B2235/3275C04B2235/3418C04B2235/6562C04B2235/6567C04B2235/658C04B2235/94C04B2235/95H01F1/11H01F41/0266
Inventor 丁伯明胡良权叶华吕舒宏
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD
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