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Preparation method of soft magnetic composite material for stator

A soft magnetic composite material and stator technology, which is applied in the fields of inorganic material magnetism, inductor/transformer/magnet manufacturing, metal processing equipment, etc. Achieve the effect of easy mass production, high magnetic induction intensity and simple process

Active Publication Date: 2021-03-12
NBTM NEW MATERIALS GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above-mentioned preparation method has relatively complex process, high manufacturing cost, relatively low magnetic induction or density, difficulty in industrial production, or great environmental pollution.
[0005] Another example is the Chinese invention patent "A Soft Magnetic Composite Material and Its Preparation Method", whose patent number is CN201410235910.8 (authorized announcement number is CN104036905B), which discloses a soft magnetic composite material prepared by phosphoric acid passivation treatment, pressing and heat treatment. , the magnetic permeability of the soft magnetic composite material prepared by the above preparation method is low and the magnetic loss is high, it is difficult to meet the needs of the motor stator

Method used

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  • Preparation method of soft magnetic composite material for stator
  • Preparation method of soft magnetic composite material for stator
  • Preparation method of soft magnetic composite material for stator

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Experimental program
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Effect test

Embodiment 1

[0032] Such as Figure 1 to Figure 3 Shown is the first preferred embodiment of the present invention.

[0033] The iron-containing powder used in this embodiment is water atomized pure iron powder, and the alcohol diluent is ethanol. The preparation method of the stator soft magnetic composite material in this embodiment includes the following steps in sequence:

[0034] 1) Annealing treatment

[0035] Select 1 kg of water-atomized iron powder with a median diameter (average particle diameter) of 200 μm, and use a continuous mesh belt furnace to anneal at an annealing temperature T1 of 1000 ° C, annealing holding time t1 of 90 minutes, and anneal in a nitrogen protective atmosphere ;

[0036] 2) Mix siloxane and ethanol at a mass ratio of 1:10 to prepare a siloxane dilution, and mix phosphoric acid and ethanol at a mass ratio of 1:5 to prepare a phosphoric acid dilution;

[0037] 3) Add 4% siloxane diluent that accounts for 4% of the annealed iron powder to the iron powde...

Embodiment 2

[0043] The second preferred embodiment of this embodiment, the alcohol diluent of this embodiment is propanol. The preparation method of the stator soft magnetic composite material in this embodiment includes the following steps in sequence:

[0044] 1) Annealing treatment

[0045] Select 1 kg of water-atomized iron powder with a median diameter of 170 μm, and use a continuous mesh belt furnace to anneal at an annealing temperature T1 of 850 ° C, annealing holding time t1 of 150 min, and anneal in a nitrogen protective atmosphere;

[0046] 2) Mix siloxane and propanol in a mass ratio of 1:40 to prepare a siloxane dilution, and mix phosphoric acid and propanol in a mass ratio of 1:15 to prepare a phosphoric acid dilution;

[0047] 3) Add 8% siloxane diluent in the iron powder in step 1), stir evenly until the powder is dry, then add the 9% phosphoric acid dilution, stir until the powder is dry to obtain coated iron powder;

[0048] 4) adding 0.8% paraffin release agent to th...

Embodiment 3

[0052] The third preferred embodiment of this embodiment, the alcohol diluent of this embodiment is butanol. The preparation method of the soft magnetic composite material for the stator of this embodiment includes the following steps in sequence:

[0053] 1) Annealing treatment

[0054] Select 1 kg of water-atomized iron powder with a median diameter of 230 μm, and use a continuous mesh belt furnace to anneal at an annealing temperature T1 of 1050 ° C, annealing holding time t1 of 45 minutes, and anneal in a hydrogen protective atmosphere;

[0055] 2) Mixing siloxane and butanol at a mass ratio of 1:3 to prepare a siloxane dilution, and mixing phosphoric acid and butanol at a mass ratio of 1:1 to prepare a phosphoric acid dilution;

[0056] 3) Add 2% siloxane diluent that accounts for 2% of the annealed iron powder mass ratio to the iron powder in step 1), stir evenly until the powder is dry, then add 2% siloxane diluent that accounts for the annealed iron powder mass ratio ...

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Abstract

The invention relates to a preparation method of a soft magnetic composite material for a stator. The preparation method sequentially comprises the following steps of annealing iron powder, preparingsiloxane diluent and phosphoric acid diluent, adding the diluent for coating treatment, mixing a release agent for compression molding, and carrying out stress relief annealing on a pressed blank. Compared with the prior art, the soft magnetic composite material has the advantages that the annealed iron powder is subjected to coating treatment by sequentially adding the siloxane diluent and the phosphoric acid diluent, the addition amount of coating substances is small, and iron powder particles are effectively insulated, so that the soft magnetic composite material has the comprehensive properties of high density, high magnetic induction intensity, high magnetic conductivity, low magnetic loss and the like, and the material can be used as a motor stator material. Moreover, the preparationmethod is simple in process, relatively low in cost and easy for batch production.

Description

technical field [0001] The invention belongs to the technical field of magnetic functional materials and powder metallurgy, and in particular relates to a preparation method of a soft magnetic composite material for a motor stator. Background technique [0002] The traditional motor stator core is mostly made of laminated silicon steel sheet soft magnetic material, and the sheets are insulated to reduce eddy current loss. The silicon steel sheet material can only conduct magnetism in the two-dimensional direction of the plane, and the stamping method is used, so the utilization rate of raw materials is low. Moreover, it is difficult to realize the stator parts with complex shapes or axial flux motor stators with silicon steel sheet materials. The iron powder core is a new type of soft magnetic composite material produced by powder metallurgy technology, which is insulated and coated on the surface of iron powder particles, mixed with a release agent, and then molded. The c...

Claims

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Application Information

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IPC IPC(8): B22F1/02H01F1/33H01F41/02
CPCH01F41/02H01F1/33B22F1/16Y02T10/64
Inventor 杨敏包崇玺陈兵
Owner NBTM NEW MATERIALS GRP
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