Permanent ferrite magnetic shoe for DC electric motor and production method thereof

A permanent magnet ferrite, DC motor technology, applied in the direction of inorganic material magnetism, magnetic circuit static parts, magnetic circuit rotating parts, etc., can solve the problem of low intrinsic coercivity temperature coefficient, high residual magnetic induction intensity, high internal Intrinsic coercivity and other issues, to achieve high residual magnetic induction intensity, high magnetic field orientation, and ensure stability.

Active Publication Date: 2009-07-15
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention also solves the problems in the prior art that the ferrite has high residual magnetic induction, high coercive force, high intrinsic coercive force, high magnetic energy product and low intrinsic coercive forc

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The main components of the permanent magnet ferrite tile material are as follows, the main component particle size is 5μm, the purity of raw materials and additives are above 97%.

[0036] Main ingredient: SrO 9.6%

[0037] Fe 2 o 3 86.2%

[0038] Additive: CaCO 3 0.6%

[0039] SiO 2 0.5%

[0040] Al 2 o 3 0.4%

[0041] Cr 2 o 3 0.45%

[0042] SrCO 3 0.3%

[0043] Bi 2 o 3 0.15%

[0044] La 2 o 3 0.5%

[0045] co 2 o 3 0.5%

[0046] Dispersant 0.8%

[0047] The dispersant can be selected from one or more of ammonium polyacrylate, sorbitol, and calcium gluconate.

[0048] The preparation steps of the above materials are:

[0049] (A) One-time ball mill mixing: Stir iron red and strontium carbonate in a mixing tank for 10 minutes, then enter the ball mill and mix for 4 to 6 hours, the average particle size is controlled at 0.7 to 0.8 μm, and the mass per...

Embodiment 2

[0058] Main ingredient: SrO 9.6%

[0059] Fe 2 o 3 86.2%

[0060] Additive: CaCO 3 0.7%

[0061] SiO 2 0.6%

[0062] Al 2 o 3 0.6%

[0063] Cr 2 o 3 0.3%

[0064] SrCO 3 0.3%

[0065] Bi 2 o 3 0.2%

[0066] La 2 o 3 0.4%

[0067] Co2O 3 0.4%

[0068] Dispersant 0.7%

[0069] The dispersant can be selected from one or more of ammonium polyacrylate, sorbitol, and calcium gluconate.

[0070] The preparation steps of the above materials are:

[0071] (A) One ball mill mixing: Stir iron red and strontium carbonate in a mixing tank for 10 minutes, then enter the ball mill and mix for 6 hours, the average particle size is controlled at 0.8 μm, and the mass percentage of material: ball: water is 1:3:1.1 , get slurry;

[0072] (B) Pre-firing: Pre-fire the ...

Embodiment 3

[0080] Main ingredient: SrO 9.6%

[0081] Fe 2 o 3 86.2%

[0082] Additive: CaCO 3 0.8%

[0083] SiO 2 0.6%

[0084] Al 2 o 3 0.3%

[0085] Cr 2 o 3 0.4%

[0086] SrCO 3 0.2%

[0087] Bi 2 o 3 0.2%

[0088] La 2 o 3 0.5%

[0089] co 2 o 3 0.5%

[0090] Dispersant 0.8%

[0091] The dispersant can be selected from one or more of ammonium polyacrylate, sorbitol, and calcium gluconate.

[0092] The preparation steps of the above materials are:

[0093] (A) One-time ball mill mixing: Stir iron red and strontium carbonate in a mixing tank for 10 minutes, then enter the ball mill and mix for 4 hours, the average particle size is controlled at 0.7 μm, and the mass percentage of material: ball: water is 1:3:1.1 , get slurry;

[0094] (B) Pre-firing: pre-fire the above slurry in a rotary kil...

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Abstract

The present invention relates to magnetic materials, particularly relates to a permanent ferrite magnetic shoe for DC motor and method thereof. The present invention also solves technical problems that exists in prior art, namely allowing the ferrite with high residual magnetic induction intensity, high coercitive force, high intrinsic coercitive force, high magnetic energy product and low intrinsic coercitive force temperature coefficient at the same time; provides a formula that can optimize each parameter of the ferrite comprehensively and effectively and preparation method of producing the ferrite powder and magnetic shoe for permanent magnetism DC. The present invention adopts domestic high pure iron-oxide red, SrCO3 and adds CaCO3, SiO2, Al2O3, Cr2O3,SrCO3, Bi2O3, La2O3, Co2O3 and organic dispersants in second seat grinding to modify the permanent ferrite.

Description

technical field [0001] The invention relates to magnetic materials, in particular to a permanent magnet ferrite magnetic tile for a DC motor and a preparation method thereof. Background technique [0002] Sintered permanent magnet ferrite has the advantages of stable magnetic properties and strong demagnetization resistance; it is not easy to rust and does not need to be coated with a protective layer; it is hard and brittle and can be used for special tool processing and cutting; Suitable for automobiles, household appliances, industrial automation and other industries. The sintered permanent ferrite is made of hexagonal sintered ferrite magnets, especially the hexagonal magnetoplumbite ferrite is more widely used. Oxide permanent magnet ferrite material mainly adopts strontium ferrite (SrO·6Fe) with magnetoplumbite (M type) hexagonal structure 2 o 3 ) and barium ferrite (BaO·6Fe 2 o 3 ) as a raw material to sinter magnets. There are two main parameters that affect th...

Claims

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Application Information

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IPC IPC(8): H02K1/17H02K1/27H01F1/10H02K15/03C04B35/26C04B35/64
Inventor 胡良权包大新丁伯明杨武国叶华
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD
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