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A method for preparing metal soft magnetic powder cores from inorganic insulating bonding particles

A metal soft magnetic and inorganic insulation technology, applied in the direction of inorganic materials, magnetic materials, magnetic objects, etc., can solve the problems of low tensile strength, poor product performance, and failure to meet industry standards, etc., to increase radial tensile strength , the effect of improving production efficiency

Active Publication Date: 2015-12-23
ZHEJIANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The weak point of this technical scheme is that the product performance prepared with this organic binder is relatively poor; The product made by utilizing this technical scheme is tested and found that its DC superposition characteristic is at 40Oe, and the effective magnetic permeability is only 50% (effective permeability is magnetic permeability μ and vacuum permeability μ 0 Ratio), at f=50kHz, B m Iron loss P at =1000Gs cv More than 300mW / cm 3 , lower than the industry standard, and the tensile strength of the product is low
As an inorganic binder, sodium silicate is environmentally friendly and the strength of the prepared magnetic powder core is high, but the comprehensive magnetic properties are greatly reduced, especially the power loss is greatly increased, which cannot meet the industry standards

Method used

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  • A method for preparing metal soft magnetic powder cores from inorganic insulating bonding particles
  • A method for preparing metal soft magnetic powder cores from inorganic insulating bonding particles
  • A method for preparing metal soft magnetic powder cores from inorganic insulating bonding particles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Mix iron powders of different meshes, among which, iron powders of -100 mesh to +200 mesh account for 10% of the total mass, and iron powders of -200 mesh to +400 mesh account for 80% of the total mass. -400 mesh iron powder accounts for 10% of the total mass;

[0024] (2) Add hydrogen peroxide passivator to the iron powder prepared in step (1) for passivation treatment, the quality of hydrogen peroxide is 0.1% of the total weight of the magnetic powder;

[0025] (3) Fully mix the inorganic insulating particles directly with the passivated iron powder, the mass of the inorganic insulating particles is 0.1% of the total weight of the iron powder, and the mass percentage of the inorganic insulating bonding particles is 30%P 2 o 5 , 60%ZnO, 10%B 2 o 3 ;

[0026] (4) Add 0.01% by weight of kaolin insulating agent, and then add 0.2% by weight of zinc stearate release agent;

[0027] (5) Press the mixture obtained in step (4) under a pressure of 1200 MPa to form a ri...

Embodiment 2

[0031] (1) Mix iron-silicon powders of different meshes, among which, iron-silicon powders of -100 mesh to +200 mesh account for 30% of the total mass, and iron-silicon powders of -200 mesh to +400 mesh account for 40% of the total mass. -400 mesh iron-silicon powder accounts for 30% of the total mass;

[0032] (2) Add a phosphoric acid passivator to the iron-silicon powder prepared in step (1) for passivation treatment, and the quality of phosphoric acid is 5% of the total weight of the iron-silicon powder;

[0033] (3) Fully mix the inorganic insulating particles directly with the passivated iron-silicon powder, the mass of the inorganic insulating particles is 3% of the total weight of the iron-silicon powder; the mass percentage component of the inorganic insulating bonding particles is 30%P 2 o 5 , 59.9%ZnO, 10%B 2 o 3 , 0.02%CuO, 0.02%Bi 2 o 3 , 0.02%SrO 5 , 0.01%Al 2 o 3 , 0.01%Na 2 O, 0.01%Li 2 o 5 , 0.01%PbO;

[0034] (4) Add 0.1% by weight of mica powder ...

Embodiment 3

[0039] (1) Mix sendust powders of different meshes, among them, -100 mesh to +200 mesh sendust powder accounts for 10% of the total mass, and -200 mesh to +400 mesh sendust powder accounts for 10% of the total mass 70%, -400 mesh sendust powder accounts for 20% of the total mass;

[0040] (2) Add a passivating agent to the sendust powder prepared in step (1) for passivation treatment, the passivator is phosphoric acid and hydrogen peroxide; wherein, the mass of phosphoric acid is the total mass of sendust mixed powder 0.3%, the mass of hydrogen peroxide is 0.5% of the total mass of sendust mixed powder;

[0041] (3) Fully mix the inorganic insulating particles directly with the passivated sendust powder, the mass of the inorganic insulating particles is 0.8% of the total weight of the sendust powder; the mass percentage component of the inorganic insulating bonding particles is 30%P 2 o 5 , 35%ZnO, 10%B 2 o 3 , 20%CuO, 1%Bi 2 o 3 , 1%SrO 5 , 1%Al 2 o 3 , 1%Na 2O, 0.5...

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Abstract

The invention discloses a method for preparing metal soft magnetic powder core by adopting inorganic insulation adhesive particles. The method includes steps of 1), matching and mixing the metal soft magnetic powder according to particle size of the powder; 2), adding passivant into the magnetic powder matched in the step 1) and for passivating treatment; 3), mixing the inorganic insulation particles with passivated magnetic powder intensively and directly; 4), adding insulating compound 0-0.1 in weight percentage; 5), moulding mixture obtained in the step 4) at 1200-2500MPa, placing blank samples in a protective atmosphere and subjecting the blank samples to thermal insulation at the temperature of 400-800 DEG C for 0.5-3 hours prior to air cooling and spraying to obtain target products. An inorganic adhesive coating process adopted in the method is pollution-free to environment, passivated films are even and clean, the products after annealing are high in tensile strength with no need for solidification, so that production efficiency is improved. Besides, comprehensive performance of the products is good and above the industry standard.

Description

technical field [0001] The invention relates to the technical field of manufacturing magnetic objects, in particular to a method for preparing metal soft magnetic powder cores from inorganic insulating bonding particles. Background technique [0002] The metal soft magnetic powder core is manufactured by powder metallurgy molding technology after mixing ferromagnetic metal (or alloy) particles and insulating medium (forming a thin film). At present, most domestic manufacturers still use the organic bonding coating process to prepare metal soft magnetic powder cores. The preparation process of the bonding has a long period, pollutes the environment, and has great potential harm to the body of the operator, and the anti-aging ability of the prepared magnetic powder core is weak. [0003] The Chinese invention patent with the publication number CN101226804A discloses a manufacturing method of a sendust magnetic powder core with a magnetic permeability μ=125, wherein the binder...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/147H01F1/22
Inventor 严密林坤张念伟钱琼炯
Owner ZHEJIANG UNIV
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