Permanent magnet oxysome magnetic shoe and producing method thereof

A technology of permanent magnet ferrite and manufacturing method, which is applied in the manufacture of inductance/transformer/magnet, manufacture of stator/rotor body, magnetism of inorganic materials, etc., can solve the problems of easy demagnetization, low level, and poor high and low temperature resistance of magnets. , to achieve the effect of increasing density and degree of orientation, increasing degree of orientation and reducing agglomeration

Inactive Publication Date: 2007-08-22
陈赟
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

How to ensure that ferrite permanent magnets have high coercive force while having high residual magnetic induction intensity has been the goal of the magnetic material industry for many years. Although there are many magnetic material manufacturers currently producing, the level is not high, especially for the production of automobiles. 1. The production level of tile-shaped magnets for motorcycle starter motors is mostly at Br: 3600-3400Gs, Hcb: 3300-3400Oe, (Bh)max: 3.0-3.1MGs. This kind of magnetic poles installed on the motor has poor performance against high and low temperature , the demagnetization rate reaches 20%, but the current starter requires the demagnetization rate to be below 10%, and because the starter’s working conditions are relatively harsh and the humidity is high, it is required to have the performance of high and low temperature resistance (-40°C-140°C). High temperature resistant tile magnets, but the Hcj of domestically produced magnets are all below 4500Oe. This kind of magnets has poor high and low temperature resistance, and the Br is not high, so it is easy to demagnetize

Method used

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  • Permanent magnet oxysome magnetic shoe and producing method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Embodiment 1: a kind of permanent magnet ferrite magnetic tile, is made up of main component and additive (expressed in wt.%): main component calcined material is: iron red Fe2O3 and strontium carbonate SrCO3 carry out batching according to stoichiometric as n=6 Take 96.5%; Additive: CaCO 3 1.1%, SiO 2 0.5%, Al 2 o 3 0.5%, H 3 BO 3 0.3%, BiO 3 0.3%, Co 3 o 4 0.4%, La 2 o 3 0.4%.

Embodiment 2

[0030] Embodiment 2: A kind of permanent ferrite magnetic tile, is made up of main component and additive (expressed with wt.%): Main component: calcined material: iron red Fe2O3 and strontium carbonate SrCO3 carry out batching according to stoichiometry as n=6 Take 96.8%; Additive: CaCO 3 1%, SiO 2 0.4%, Al 2 o 3 0.6%, H 3 BO 3 0.2%, BiO 3 0.3%, Co 3 o 4 0.3%, La 2 o 3 0.4%.

Embodiment 3

[0031] Embodiment 3: a kind of permanent ferrite magnetic tile, is made up of main component and additive (expressed in wt.%): main component: calcined material: iron red Fe2O3 and strontium carbonate SrCO3 carry out batching for n=6 according to stoichiometry Take 96.4%; Additive: CaCO 3 1.2%, SiO 2 0.3%, Al 2 o 3 0.8%, H 3 BO 3 0.25%, BiO 3 0.25%, Co 3 o 4 0.5%, La 2 o 3 0.3%.

[0032]The manufacturing method of the permanent ferrite magnetic tile includes the following steps in sequence: 1) high-temperature sintering of the pre-sintered material, 2), adding CaCO 3 , SiO2, Al 2 o 3 、H 3 BO 3 、BiO 3 、Co 3 o 4 , La 2 o 3 , 3) secondary ball milling, 4), (magnetic field + pressure) pressed into green body, 5) sintered blank, 6), performance testing, 7) shape processing, 8) dimension inspection, 9) cleaning, 10), storage . The specific implementation can be carried out according to the following procedures:

[0033] 1) High temperature sintering of pr...

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Abstract

This invention relates to a magnetic shoe of a magnet ferrite and its manufacturing mehod including the following composition: iron red and SrCO3 96.4-97.2%, additive: CaCO31-1.2%, SiO2 0.3-0.5%, Al2O3 0.3-0.5%, H3BO3 0.3-0.2%, BiO3 0.3-0.2%, Co3O4 0.3-0.5%, La2O3 0.3-0.5%, which is advantaged that density of the material, residural magnetic induction strength Br, coecive force Hcb and self-coecive force of the material are increased, conglobation of particles is reduced and the orientation degree is increased and density and orientation degree of raw blanks are increased by a method of automatic slurry injection and orientation of high magnetic field and suppression in the same direction.

Description

technical field [0001] The invention belongs to the field of permanent ferrite preparation, and relates to a permanent ferrite tile and a manufacturing method thereof. Background technique [0002] Permanent magnet ferrite is currently the most widely used and produced permanent magnet material in the world, and it has been widely used in automobiles, household appliances, electrical equipment and other fields. The permanent magnet ferrite magnetic tile is the key component of the miniature permanent magnet DC motor. Due to the working condition characteristics of the high-performance miniature branch motor: high initial resistance distance and large short-term excitation current, the magnet is required to meet the requirements of the motor on the one hand in terms of magnetic performance. The requirements for permanent magnets, on the other hand, have a corresponding intrinsic coercive force to ensure that under the action of a strong demagnetization field, the magnet has n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/10H01F41/02B22F3/12H02K15/03
Inventor 陈赟
Owner 陈赟
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