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Preparation method of dry process strontium ferrite magnetformed through dry process

A strontium ferrite and dry forming technology is applied in the field of preparation of dry forming strontium ferrite magnets, which can solve the problems of low remanence, high residual non-magnetic substances and high addition amount, and achieves high production efficiency, The effect of improving strength and orientation, and adding less amount

Active Publication Date: 2018-06-12
HUNAN AEROSPACE MAGNET & MAGNETO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the total addition amount of these two types of additives is 0.7-1.8%, the overall addition amount is too high, which will lead to a high residual amount of non-magnetic substances (mainly carbon-containing substances) in the magnet after sintering, resulting in a high magnetic performance of the magnet, especially low remanence

Method used

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  • Preparation method of dry process strontium ferrite magnetformed through dry process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] (1) Add 35kg of water to 65kg of strontium ferrite pre-fired material, and then add 3.25kg of CaCO 3 , 1.95kgAl 2 o 3 and 1.95kgH 3 BO 3 , and carried out wet ball milling for 15 hours to obtain strontium ferrite slurry;

[0040] (2) The strontium ferrite slurry obtained in step (1) was wet-pressed to a density of 2.8 g / cm in a magnetic field of 8000 Oe at a pressure of 16 MPa 3 , to obtain a cylindrical strontium ferrite green body with a diameter of 40mm and a thickness of 20mm;

[0041] (3) drying the strontium ferrite green body obtained in step (2) at 100° C. for 10 h, and then crushing to obtain oriented magnetic blocks;

[0042] (4) Add 0.2 kg of stearic acid amide with a particle size of 325 mesh and 0.2 kg of oleic acid amide with a particle size of 325 mesh to the magnetic block with orientation obtained in step (3), disperse, pulverize, and sieve to the particle size Diameter ≤ 60 mesh, get anisotropic powder;

[0043] (5) Dry press the anisotropic pow...

Embodiment 2

[0045] (1) Add 38kg of water to 62kg of strontium ferrite pre-fired material, and then add 3.50kg of CaCO 3 and 2.00kg SiO 2 , perform wet ball milling for 13 hours to obtain strontium ferrite slurry;

[0046] (2) The strontium ferrite slurry obtained in step (1) was wet-pressed to a density of 3.0 g / cm in a 10,000 Oe magnetic field at a pressure of 20 MPa 3 , to obtain a cylindrical strontium ferrite green body with a diameter of 40mm and a thickness of 18mm;

[0047] (3) drying the strontium ferrite green body obtained in step (2) at 120°C for 8 hours, and then crushing to obtain oriented magnetic blocks;

[0048] (4) Add 0.2 kg of stearic acid amide with a particle size of ≤325 mesh and 0.3 kg of oleic acid amide with a particle size of ≤325 mesh to the magnetic block with orientation obtained in step (3), disperse, pulverize, and sieve to the particle size Diameter ≤ 60 mesh, get anisotropic powder;

[0049] (5) Dry press the anisotropic powder obtained in step (4) to ...

Embodiment 3

[0051] (1) Add 38kg of water to 62kg of strontium ferrite pre-fired material, and then add 3.00kg of CaCO 3 and 1.85kg SiO 2 , perform wet ball milling for 12 hours to obtain strontium ferrite slurry;

[0052] (2) The strontium ferrite slurry obtained in step (1) was wet-pressed to a density of 2.9 g / cm in a magnetic field of 7000 Oe at a pressure of 18 MPa 3 , to obtain a cylindrical strontium ferrite green body with a diameter of 40mm and a thickness of 21mm;

[0053] (3) drying the strontium ferrite green body obtained in step (2) at 120° C. for 6 hours, and then crushing to obtain oriented magnetic blocks;

[0054] (4) Add 0.1 kg of stearic acid amide with a particle size of ≤300 mesh and 0.4 kg of oleic acid amide with a particle size of ≤300 mesh to the magnetic block with orientation obtained in step (3), and disperse, pulverize, and sieve to the particle size Diameter ≤ 40 mesh, get anisotropic powder;

[0055] (5) Dry press the anisotropic powder obtained in step ...

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Abstract

The invention discloses a preparation method of a dry process strontium ferrite magnetformed through adry process. The preparation method comprises the following steps: (1) adding water into strontiumferrite powder, adding an additive and performing wet process ball milling to obtain strontium ferrite slurry; (2) performing wet process compression molding on the strontium ferrite magnet slurry obtained in the step (1) in a magnetic field to obtain a strontium ferrite green body; (3) drying and smashing the strontium ferrite green body prepared in the step (2) to obtain oriented magnetic material blocks; (4) adding an amide micro powder additive into the oriented magnetic material blocks obtained in the step (3), and performing dispersion, smashing and sieving to obtain anisotropic powder;(5) performing dry-pressing molding on the anisotropic powder obtained in the step (4) in the magnetic field, performing sintering and grinding to obtain the strontium ferrite magnet. The strontium ferrite magnet green body prepared according to the method is high in strength and high in yield; the dry process strontium ferrite magnet formed through the dry process is high in magnetic performance, and particularly the residual magnetism is up to 98 or more of that of a wet process molded product. The method disclosed by the invention is simple, is low in production cost, and is high in production efficiency.

Description

technical field [0001] The invention relates to a preparation method of a strontium ferrite magnet, in particular to a preparation method of a dry-formed strontium ferrite magnet. Background technique [0002] The currently used strontium ferrite is mainly hexagonal magnetoplumbite ferrite, and its application fields are roughly: motors (small motors, etc.) account for 50%, electroacoustics (speakers, etc.) account for 20%, measurement and control Devices (magnetrons, etc.) account for 20%, and the rest (magnetic rollers, etc.) account for 10%. With the rapid development of industries such as automobiles, home appliances, electric tools, and instruments at home and abroad, the amount of strontium ferrite will continue to increase. [0003] Strontium ferrite is made by mixing iron oxide and strontium compound in a certain proportion, pre-sintering, crushing, pressing in a magnetic field, sintering and grinding. The methods of compression molding in a magnetic field are main...

Claims

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Application Information

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IPC IPC(8): C04B35/26C04B35/622C04B35/632H01F1/11B28B3/00
CPCB28B3/00C04B35/2633C04B35/2641C04B35/2666C04B35/622C04B35/632C04B2235/3208C04B2235/3213C04B2235/3217C04B2235/3227C04B2235/3275C04B2235/3409C04B2235/608C04B2235/6562C04B2235/6567H01F1/11
Inventor 姚锐陈晓宇刘超颜铄清姜毅
Owner HUNAN AEROSPACE MAGNET & MAGNETO
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