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Preparation method of self-lubricating insulated iron powder for motor magnetic core

A self-lubricating, magnetic core technology, applied in magnetic circuits characterized by insulating materials, metal material coating processes, etc., can solve the problems of easy shedding, uneven distribution of lubricants, affecting powder pressing performance and magnetic performance, etc. Achieve the effect of simple process, low cost and high resistivity

Inactive Publication Date: 2010-03-03
UNIV OF SCI & TECH BEIJING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The insulating powder prepared by the above-mentioned patented technology does not contain a self-lubricating layer and needs to add lubricants externally, which has disadvantages such as uneven distribution of lubricants and easy falling off, which affects the pressing performance and magnetic properties of the powder

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Using industrially produced water atomized and reduced iron powder as raw materials, the phosphating solution is selected from Zn 3 (PO 4 ) 2 , Zn 2 Fe(PO 4 ) 2 , phosphoric acid, nitric acid and deionized water, treated in phosphating solution with different solubility, phosphating temperature is 60°C, stirring time is 30min, after filtering and washing, carry out in 5% sodium stearate saponification solution Treatment, temperature is 60°C, time is 30min, filtration, drying, drying temperature is 100°C, and then press molding at 700MPa, analysis of magnetic permeability and magnetic loss (under the condition of 50Hz), the results are shown in Table 1.

[0021] Table 1 by Zn 3 (PO 4 ) 2 , Zn 2 Fe(PO 4 ) 2 Phosphating solution composed of phosphoric acid, nitric acid and deionized water

[0022]

Embodiment 2

[0024] Using industrially produced water atomized and reduced iron powder as raw materials, the phosphating solution is selected from Zn 2 FeMn(PO 4 ) 2 , Zn 2 Fe(PO 4 ) 2 , phosphoric acid, nitric acid and deionized water for treatment, the phosphating temperature is 60°C, the stirring time is 30min, after filtration and washing, it is treated in 5% sodium stearate saponification solution, the temperature is 60°C , time 30min, filter, dry, drying temperature is 100 ℃, and then press molding at 700MPa, analysis of magnetic permeability and magnetic loss (under the condition of 50Hz), the results are shown in Table 2.

[0025] Table 2 by Zn 2 FeMn(PO 4 ) 2 , Zn 2 Fe(PO 4 ) 2 Phosphating solution composed of phosphoric acid, nitric acid and deionized water

[0026]

Embodiment 3

[0028] Using industrially produced water atomized and reduced iron powder as raw materials, choose Zn 2 Ca(PO 4 ) 2 , Zn 2 Fe(PO 4 ) 2 , phosphoric acid, nitric acid and deionized water for treatment, the phosphating temperature is 60°C, the stirring time is 30min, after filtration and washing, it is treated in 5% sodium stearate saponification solution, the temperature is 60°C , for 30 minutes, filtered and dried at a drying temperature of 100°C, and then pressed at 700MPa to analyze the magnetic permeability and magnetic loss (under the condition of 50Hz). The results are shown in Table 3.

[0029] Table 3 by Zn 2 Ca(PO 4 ) 2 , Zn 2 Fe(PO 4 ) 2 Phosphating solution composed of phosphoric acid, nitric acid and deionized water

[0030]

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PUM

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Abstract

A preparation method of a self-lubricating insulated iron powder for a motor magnetic core belongs to the technical fields of magnetic functional material and powder metallurgy. The preparation methodcomprises the steps of adding water-atomized iron powder or reduced iron powder that is produced industrially in phosphorated fluid, stirring for 10-90 minutes at temperature of 20-90 DEG C, filtering, washing and then adding the mixture in saponified fluid, stirring for 10-90 minutes at temperature of 20-90 DEG C, filtering, and at last conducting drying at temperature of 20-150 DRG C to obtainthe insulated iron powder which is coated with phosphate and zinc stearate on the surface and has lubricating function. The preparation method has the advantages of simple technology, low cost, easy formation of industrialized scale and capability of directly obtaining powder with high resistivity, good lubricating property and good compression property; and during forming, without adding any lubricants, the preparation method can obtain an iron powder magnetic core with high performance, thus being applicable to novel, variable-frequency and high-frequency motor magnetic cores.

Description

technical field [0001] The invention belongs to the technical field of magnetic functional materials and powder metallurgy, and in particular provides a preparation method of self-lubricating insulating iron powder for motor magnetic cores, which is a high-quality raw material for novel, variable-frequency, high-frequency motor magnetic cores. Background technique [0002] With the development of miniaturization and functionalization of motors, new motors are emerging, such as high-speed transverse field motors, armature claw pole motors, axial field motors, and vertical motors. The shape of these motor rotor cores is complex, requiring three-dimensional magnetic circuit design and high frequency of use. Traditional silicon steel sheet materials are difficult to meet the requirements. Large eddy current losses, etc. The iron powder-based soft magnetic composite material core obtained by pressing insulating iron powder just makes up for the shortage of silicon steel. The spe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/02C23C22/07H02K1/04
Inventor 田建军尹福正潘德安张深根杨钰婷
Owner UNIV OF SCI & TECH BEIJING
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