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Mixed soft magnetic powder for metal magnetic powder core

A technology of soft magnetic powder and mixed powder, applied in the field of mixed soft magnetic powder, can solve the problems of deterioration of magnetic properties, affecting dimensional accuracy, etc., and achieve the effects of suppressing the deterioration of magnetic properties, improving dimensional accuracy, and preventing the reduction of density

Inactive Publication Date: 2014-04-23
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The dimensional expansion of the magnetic powder core due to heat treatment not only affects the dimensional accuracy of the final product, but also tends to deteriorate the magnetic properties

Method used

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  • Mixed soft magnetic powder for metal magnetic powder core
  • Mixed soft magnetic powder for metal magnetic powder core
  • Mixed soft magnetic powder for metal magnetic powder core

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] As the soft magnetic metal powder, select FeSi powder, use 100 mesh, 200 mesh, and 400 mesh screens to sieve the powder, and take the powder under the sieve for later use.

[0016] As the surface insulating layer of soft magnetic metal powder, it is first phosphating for inorganic insulation, and then silicone resin treatment for organic insulation. The mass ratio of the treatment liquid for phosphating treatment is: water: H 3 PO 4 :(NH 4 ) 2 HPO 4 =50:30:20. The thickness of the insulating layer after phosphating is 40-80nm. When treating the silicone resin, first dissolve the silicone resin in toluene to make the resin concentration 8%. The thickness of the organic insulating layer formed after the silicone resin treatment is 200-400nm.

[0017] The magnetic powder after the insulation treatment is mixed with the zinc stearate lubricant, and the mass ratio of the zinc stearate is 0.8% relative to the total mass of the mixed soft magnetic metal powder.

[0018...

Embodiment 2

[0025] As the soft magnetic metal powder, select FeSiAl powder, use 100 mesh, 200 mesh, 400 mesh sieves to sieve the powder, and take the sieved powder for later use.

[0026] As the surface insulating layer of soft magnetic metal powder, it is first phosphating for inorganic insulation, and then silicone resin treatment for organic insulation. The mass ratio of the treatment liquid for phosphating treatment is: water: H 3 PO 4 :(NH 4 ) 2 HPO 4 =50:30:20. The thickness of the insulating layer after phosphating is 40-80nm. When treating the silicone resin, first dissolve the silicone resin in toluene to make the resin concentration 7%. The thickness of the organic insulating layer formed after the silicone resin treatment is 200-400nm.

[0027] The magnetic powder after the insulation treatment is mixed with the zinc stearate lubricant, and the mass ratio of the zinc stearate is 0.5% relative to the total mass of the mixed soft magnetic metal powder.

[0028] The above ...

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Abstract

The invention discloses mixed soft magnetic powder for a metal magnetic powder core. The mixed soft magnetic powder for the metal magnetic powder core is characterized in that the surface of soft magnetic metal powder is provided with powder with a surface insulating layer and a molding lubricant; relative to total mass of the mixed powder, mass of the mixed powder with particle size below 100 meshes accounts for more than 95%, mass of the mixed power with the particle size below 200 meshes accounts for more than 70%, and mass of the mixed power with the particle size below 400 meshes accounts for less than 30%. The mixed soft magnetic powder for the metal magnetic powder core has the advantages that by reasonable control on particle size distribution of the soft magnetic metal powder with the insulating layer and the mixed soft magnetic metal powder containing the lubricant, gas generated after the lubricant is subjected to heat treatment in the magnetic powder core an be smoothly discharged from the inside of the magnetic powder core, volume expansion of the magnetic powder core after heat treatment can be effectively restrained, density of the magnetic power core is prevented from decreasing due to heat treatment, dimensional accuracy of the magnetic power core is improved, and magnetic property is inhibited from deteriorating.

Description

technical field [0001] The invention belongs to the technical field of mixed soft magnetic powder, in particular to a mixed soft magnetic powder for metal magnetic powder cores. Background technique [0002] Compared with silicon steel sheets, soft magnetic metal powder cores have the advantage of low loss; compared with soft ferrite cores, soft magnetic metal powder cores have the advantage of high saturation flux density. Therefore, metal magnetic powder cores have been widely used in high-frequency and high-power inductance devices in recent years. In order to reduce the loss of the magnetic powder core and improve the DC superposition performance, so far, studies have been carried out on powder heat treatment, powder surface insulation coating, and high-temperature heat treatment of molded bodies. However, in the prior art, after high-temperature heat treatment is performed on the magnetic powder core molded body, the size of the magnetic powder core will change, and vo...

Claims

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Application Information

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IPC IPC(8): H01F1/14H01F1/20H01F1/24H01F1/26
Inventor 颜冲葛洪良雷国莉
Owner CHINA JILIANG UNIV
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