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Preparation method of high-coercivity strontium ferrite magnetic material

A technology of strontium ferrite and magnetic material is applied in the field of preparation of high coercivity strontium ferrite magnetic material, which can solve the problems of reduced remanence and increase of non-magnetic phase, and achieves reduced coercivity and excellent magnetic properties. , Improve the effect of intrinsic coercivity

Inactive Publication Date: 2021-03-16
ZHONGDE ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to significantly improve the coercive force, a certain amount of addition is usually required, but as the content of these additives increases, the non-magnetic phase increases, which will lead to a decrease in remanence

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A method for preparing a high-coercivity strontium ferrite magnetic material, comprising the following steps:

[0027] S1. Weigh Fe by molar ratio (5.9-6.1): 1 2 o 3 Powder, SrCO 3 Powder, mixed evenly to obtain a premix;

[0028] S2. Mix the premix and the modified kaolin additive evenly in a mass ratio of 100: (0.5-0.8), then add water and ball mill to obtain a primary slurry;

[0029] S3. After the primary slurry is dried, it is pre-fired at 1300-1320° C., and crushed after cooling to obtain a primary calcined material;

[0030] S4, adding water ball mill to the primary calcined material to obtain secondary slurry;

[0031] S5, performing wet pressing and magnetic field forming on the secondary slurry to obtain a green body;

[0032] S6. Sintering the green body at 1240-1260° C., and obtaining a high-coercivity strontium ferrite magnetic material after cooling;

[0033] Among them, the preparation method of the modified kaolin additive is as follows: firstly us...

Embodiment 2

[0035] A method for preparing a high-coercivity strontium ferrite magnetic material, comprising the following steps:

[0036] S1. Weigh Fe at a molar ratio of 6.05:1 2 o 3 Powder, SrCO 3 Powder, mixed evenly to obtain a premix;

[0037] S2. Mix the premix and the modified kaolin additive uniformly at a mass ratio of 100:0.65, then add water and ball mill until the particle size is 1-1.5 μm to obtain a primary slurry;

[0038] S3. After drying the primary slurry, pre-calcine at 1310° C. for 8 hours, and break it after cooling to obtain primary calcined material;

[0039] S4, adding water ball mill to the primary calcined material to a particle size of 0.8-1 μm to obtain a secondary slurry;

[0040] S5, performing wet pressing and magnetic field forming on the secondary slurry to obtain a green body;

[0041] S6. Sintering the green body at 1255° C. for 4 hours, and obtaining a high-coercivity strontium ferrite magnetic material after cooling;

[0042] The preparation meth...

Embodiment 3

[0046] A method for preparing a high-coercivity strontium ferrite magnetic material, comprising the following steps:

[0047] S1. Weigh Fe at a molar ratio of 5.9:1 2 o 3 Powder, SrCO 3 Powder, mixed evenly to obtain a premix;

[0048] S2. Mix the premix and the modified kaolin additive uniformly at a mass ratio of 100:0.5, then add water and ball mill until the particle size is 1-1.5 μm to obtain a primary slurry;

[0049] S3. After drying the primary slurry, pre-calcine at 1300° C. for 9 hours, and break it after cooling to obtain primary calcined material;

[0050] S4, adding water ball mill to the primary calcined material to a particle size of 0.8-1 μm to obtain a secondary slurry;

[0051] S5, performing wet pressing and magnetic field forming on the secondary slurry to obtain a green body;

[0052] S6. Sintering the green body at 1240° C. for 5 hours, and obtaining a high-coercivity strontium ferrite magnetic material after cooling;

[0053] The preparation method o...

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Abstract

The invention discloses a preparation method of a high-coercivity strontium ferrite magnetic material, which comprises the following steps of: S1, weighing Fe2O3 powder and SrCO3 powder, and uniformlymixing to obtain a premix; S2, uniformly mixing the premix with a modified kaolin additive, and then adding water and carrying out ball milling to obtain primary slurry; S3, drying the primary slurry, presintering the primary slurry at 1300-1320 DEG C, cooling, and crushing to obtain a primary presintered material; S4, adding water into the primary presintered material, and carrying out ball milling to obtain secondary slurry; S5, carrying out wet-pressing magnetic field molding on the secondary slurry to obtain a green body; and S6, sintering the green body at 1240-1260 DEG C, and cooling toobtain the material. The strontium ferrite magnetic material prepared by the invention has high coercive force and high residual magnetism, and is a permanent magnet material with excellent performance.

Description

technical field [0001] The invention relates to the technical field of ferrite magnetic materials, in particular to a preparation method of high coercivity strontium ferrite magnetic materials. Background technique [0002] Permanent magnet materials are magnetic materials that can still maintain a magnetic field after the magnetization field is removed. They can be used in the fields of computers, communications, electrical electronics, energy and power, etc. As the core materials of various magnetic energy devices, they have an irreplaceable role. Ferrite permanent magnet materials have the advantages of abundant raw material sources, low cost, stable chemical properties, good abrasion resistance, high coercive force, large saturation magnetization and good magnetocrystalline anisotropy. It is the most widely used permanent magnet material at present. With the continuous development of technology, higher and higher requirements are put forward for the performance of perma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/26C04B35/622
CPCC04B35/2683C04B35/622C04B2235/3213C04B2235/3272C04B2235/349C04B2235/602C04B2235/656C04B2235/3217C04B2235/3241C04B2235/5436C04B2235/5445
Inventor 瞿德林王久如李丛俊
Owner ZHONGDE ELECTRONICS