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Preparation method and product of strontium ferrite magnet with high mechanical strength

A technology of strontium ferrite and mechanical strength, applied in the field of permanent magnet material ferrite, can solve the problems of reducing the mechanical strength of strontium ferrite, unable to meet the needs of motor use, and failing to meet the requirements of mechanical strength, and achieve shrinkage rate Increase in density, increase in density, and prevent grain growth

Active Publication Date: 2018-08-31
SINOSTEEL TIANYUAN MAANSHAN TONGLI MAGNETIC MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the mechanical strength of the magnetic device does not meet the requirements, it may be broken during the installation or use of the motor, causing the motor rotor to be stuck and stop, and the motor to be scrapped
At present, magnetic device manufacturers generally have the problem of low mechanical strength of magnetic devices, which cannot meet customer requirements. There is an urgent need to improve the mechanical strength of magnetic devices. There are two common methods: 1) Through the molding process, increase the size of the molding pressure to compact the billet, but because the billet is too dense after forming, in the subsequent sintering procedure, the sintering internal stress of the billet is released quickly, resulting in small microcracks in the sintered body, which reduces the mechanical strength of strontium ferrite ;2) Through the grinding process, the dimensional tolerance of the product is adjusted, thereby reducing the amount of grinding of the sintered body. In this way, the thickness of the product is increased to enhance its mechanical strength, but for dimensional tolerance and high installation accuracy requirements products, this approach is not advisable, and thus cannot meet the needs of the motor

Method used

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  • Preparation method and product of strontium ferrite magnet with high mechanical strength
  • Preparation method and product of strontium ferrite magnet with high mechanical strength
  • Preparation method and product of strontium ferrite magnet with high mechanical strength

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Experimental program
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Effect test

Embodiment A1

[0030] Adopt the preparation method of strontium ferrite magnet of the present invention, specifically carry out according to the following steps:

[0031] 1), ingredients: weigh the raw materials according to the following weight ratio: Fe 2 o 3 : 86.5%, SrCO 3 : 12.5%, Al 2 o 3 : 0.5%, SiO 2 : 0.5%;

[0032] 2), one-time ball milling: the raw materials and 0.8% auxiliary material CaCO 3 Add a horizontal ball mill and add water for wet grinding, the weight ratio of material, balls and water is 1:3:2, and the particle size in the primary slurry obtained by wet grinding is 0.8 μm;

[0033] 3) Pre-firing: The ground primary slurry is dehydrated and then put into the rotary kiln for pre-firing, the sintering temperature is 1310°C, and it is kept for 2 hours;

[0034] 4), crushing: the obtained strontium ferrite calcined material is made into coarse powder with a crusher, and the particle size is controlled at 3 μm;

[0035] 5) Secondary ball milling: add 0.4% of the ball ...

Embodiment A2

[0042] Adopt the preparation method of strontium ferrite of the present invention, specifically carry out according to the following steps:

[0043] 1), ingredients: weigh the raw materials according to the following weight ratio: Fe 2 o 3 : 88%, SrCO 3 : 11%, Al 2 o 3 : 0.5%, SiO 2 : 0.5%;

[0044] 2), one-time ball milling: the raw materials and 1.0% auxiliary material CaCO 3 Add a horizontal ball mill and add water for wet grinding, the weight ratio of material, balls and water is 1:3:2, and the particle size in the primary slurry obtained by wet grinding is 1.0 μm;

[0045] 3) Pre-firing: The ground primary slurry is dehydrated and then put into the rotary kiln for pre-firing, the sintering temperature is 1310°C, and it is kept for 2 hours;

[0046] 4), crushing: the obtained strontium ferrite calcined material is made into coarse powder with a crusher, and the particle size is controlled at 4 μm;

[0047] 5), secondary ball milling: add 0.6% secondary additives mi...

Embodiment A3

[0054] Adopt the preparation method of strontium ferrite of the present invention, carry out concretely according to the following steps:

[0055] 1), ingredients: weigh the raw materials according to the following weight ratio: Fe 2 O 3 : 84.5%, SrCO 3 : 15%, Al 2 O 3 : 0.3%, SiO 2 : 0.2%;

[0056] 2), a ball mill: the raw material and 1.2% of the auxiliary material CaCO 3 Add the horizontal ball mill and add water for wet grinding, the weight ratio of material, ball and water is 1:3:2, and the particle size in the primary slurry obtained by wet grinding is 1.2 μm;

[0057] 3), pre-sintering: the ground slurry is dehydrated and then entered into the rotary kiln for pre-sintering, the sintering temperature is 1310 ° C, and the temperature is kept for 2.5 hours;

[0058] 4), crushing: the obtained strontium ferrite pre-sintered material is made into coarse powder with a crusher, and the particle size is controlled at 3 μm;

[0059] 5), secondary ball milling: add the se...

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Abstract

The invention discloses a preparation method of a high-mechanical-strength strontium ferrite magnet and a product. The preparation method includes the steps of burdening, primary ball-milling, pre-sintering, crushing, secondary ball-milling, forming, sintering, grinding and the like. The preparation method of the high-mechanical-strength strontium ferrite magnet and the product are characterized in that a secondary additive prepared by mixing gluconate and sylvite in a certain proportion is added into the step of secondary ball-milling. According to the method, the secondary additive prepared by mixing gluconate and sylvite is added into strontium ferrite, the mechanical strength of the product is changed after secondary ball-milling, forming and sintering, and the mechanical strength requirements of the product are met; meanwhile, the magnetic performance of the product is not changed, magnetic performance indexes Br and Hcb are increased, and the use performance requirements of a motor are met.

Description

technical field [0001] The invention belongs to the technical field of permanent magnet material ferrite, and in particular relates to a method for improving the mechanical strength of strontium ferrite calcined material products, and also relates to a magnet product obtained by the method. Background technique [0002] Strontium ferrite is an important magnetic functional material, and the magnetic devices made of it are widely used in automobile motors, household appliances, frequency conversion motors, sensors and generators. Performance, dimensional tolerance and appearance requirements, and an important quality index - mechanical strength. If the mechanical strength of the magnetic device does not meet the requirements, it may be broken during the installation or use of the motor, causing the rotor of the motor to be stuck and stop, and the motor to be scrapped. At present, magnetic device manufacturers generally have the problem of low mechanical strength of magnetic ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/26C04B35/622C04B35/626C04B35/64
CPCC04B35/2683C04B35/622C04B35/6261C04B35/64C04B2235/3205C04B2235/3213C04B2235/3217C04B2235/3418C04B2235/449C04B2235/602C04B2235/77C04B2235/96
Inventor 李劲松邱伟国胡智王小东马宝赵修彬
Owner SINOSTEEL TIANYUAN MAANSHAN TONGLI MAGNETIC MATERIAL