Method for manufacturing dry-pressing heterosexual permanent-magnetic material

A technology of permanent magnet material and manufacturing method, which is applied to the manufacturing field of dry-pressed anisotropic permanent-magnet materials, can solve the problems of low performance of dry-pressed permanent-magnet materials, unable to obtain good orientation degree and density, etc. Degree of orientation, density, and performance improvement effect

Active Publication Date: 2014-06-11
BEIKUANG MAGNETS FUYANG CO LTD
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Problems solved by technology

[0004] The invention proposes a method for manufacturing dry-pressed heterosexual permanent magnet materials to solve the problem that the existing dry-pressed pe

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  • Method for manufacturing dry-pressing heterosexual permanent-magnetic material

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[0024] Example 1

[0025] The pre-burned material uses the following raw materials:

[0026] Fe 2 O 3 Powder: (purity≥99.2wt%, original average particle size of particles: 1.0μm), 85.5-86.5wt%;

[0027] SrCO 3 Powder: (purity ≥98.0wt%, original average particle size of particles: 2.0μm), 13.4~14.1wt%;

[0028] Silicon oxide powder: (purity≥98.0wt%, original average particle size of particles: 2.0μm), 0.1~0.4wt%;

[0029] Weigh Fe 2 O 3 Powder, SrCO 3 The obtained raw material powder was wet-mixed with silicon oxide powder for 2 hours, dried, and calcined in the air at 1250°C for 2 hours to obtain a calcined material.

[0030] Crush the pre-burned material into coarse powder, weigh 300g of the coarse powder prepared in the above method using a known crushing method, and add 0.3wt% SiO 2 , 0.1wt% boric acid; add 600mL tap water as the ball milling medium, finely grind for 10 hours, until the average particle size of the particles is 0.75 ~ 1.0μm; centrifuge the obtained slurry, and then dr...

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Abstract

The invention discloses a method for manufacturing a dry-pressing heterosexual permanent-magnetic material, and belongs to the technical field of a permanent-magnetic material. The method comprises the following steps: crushing a pre-sintering material into crude powder, adding a quadratic formula formed by silicon dioxide and a boric acid to the crude powder and then carrying out ball-milling; scattering the slurry obtained in a ball-milling manner after baking; adding 0.1-3.0% of calcium carbonate according to the weight percent and then agitating and vibration and milling by a blender mixer to obtain mixed powder; adding allocated quantity of camphor powder and calcium stearate to the mixed powder, and then crushing at a high speed, so as to prepare the dry-pressing magnetic powder. Even dispersion can be ensured by adding the calcium carbonate after drying of fine powder is finished, and adhesion of particles is not generated. Therefore, the pressing density of a magnetic body and the control range of the drying temperature range can be improved, and meanwhile, birdnesting is opened as much as possible by a vibration and milling process. Thus, birdnesting between particles is reduced, meanwhile, a corner angle is removed, the prepared permanent-magnetic material has good orientation degree and density, and the performance is significantly improved.

Description

technical field [0001] The invention relates to a method for manufacturing a dry-pressed heterosexual permanent magnet material, which belongs to the technical field of permanent magnet materials. Background technique [0002] Permanent magnet materials are indispensable materials in the electronics industry, and are widely used in home appliances, automobiles, computers, communications, medical, aerospace, military and other fields. Due to the wide source of raw materials and low price, ferrite permanent magnet magnetic materials have relatively high remanence (Br), coercive force (Hcj) and magnetic energy product (BH)max, so they occupy a large market share in the magnetic materials market. share. In recent years, with the development of electronic technology and the improvement of awareness of energy saving and emission reduction, higher requirements are put forward for the performance of permanent ferrite. [0003] Ferrite magnets can be divided into wet pressing and d...

Claims

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Application Information

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IPC IPC(8): C04B35/26C04B35/63
Inventor 王颖泉王常蕾连江滨腾阳民李炳山
Owner BEIKUANG MAGNETS FUYANG CO LTD
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