Preparation method of metal soft magnetic powder core

A metal soft magnetic and magnetic powder technology, applied in the direction of magnetic materials, magnetic objects, inorganic materials, etc., can solve the problems of poor magnetic performance stability, high pollution, high cost, and achieve low cost, low raw material cost and high quality factor. Effect

Inactive Publication Date: 2013-08-14
HEFEI UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a metal soft magnetic powder core with simple operation, environmental protection, low production cost and good magnetic stability in order to overcome the defects of large pollution, high cost and poor magnetic stability in the above-mentioned prior art. Preparation

Method used

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  • Preparation method of metal soft magnetic powder core
  • Preparation method of metal soft magnetic powder core
  • Preparation method of metal soft magnetic powder core

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Sieve 300g iron-silicon metal magnetic powder with a 150-mesh sieve, and add nano-SiO 11.7% of the magnetic powder weight to the magnetic powder 2 Dispersion liquid and 0.5% sodium silicate powder, in which nano-SiO 2 SiO in dispersion 2 The weight concentration is 18.5%. After stirring evenly, heat to 60°C and keep stirring until the magnetic powder slurry is dry. Grind the dried magnetic powder slurry to obtain coated magnetic powder; add 0.5% of the weight of the coated magnetic powder to the coated magnetic powder Zinc stearate powder and mixed evenly, then put into the hydroforming machine, using 21.7 tons / cm 2 Φ26.92×Φ14.73×11.18, that is, an annular powder core with an outer diameter of 26.92mm, an inner diameter of 14.73mm, and a height of 11.18mm; the powder core is heated in a tube furnace with nitrogen as a protective atmosphere Heat it to 750°C and keep it warm for 30 minutes, then cool it in the furnace; finally, spray a layer of epoxy resin insulating va...

Embodiment 2

[0033] Get 300g sendust metal magnetic powder with 150 mesh sieves, add the nano-MgO dispersion liquid that accounts for 6.7% of magnetic powder weight and the sodium silicate powder of 0.8% to magnetic powder, wherein the MgO weight concentration is 35% in the nano-MgO dispersion liquid, After stirring evenly, heat it to 80°C and keep it warm, and keep stirring until the magnetic powder slurry is dry. Grind the dried magnetic powder slurry to obtain coated magnetic powder; add zinc stearate powder accounting for 0.3% of the weight of the coated magnetic powder to the coated magnetic powder. And mix evenly, then put into the hydroforming machine, use 18.3 tons / cm 2 Φ26.92×Φ14.73×11.18, that is, an annular powder core with an outer diameter of 26.92mm, an inner diameter of 14.73mm, and a height of 11.18mm; the powder core is heated in a tube furnace with nitrogen as a protective atmosphere Heat it to 700°C and keep it warm for 50 minutes, then cool it with the furnace; finally,...

Embodiment 3

[0040] Sieve 300g of iron-nickel metal magnetic powder with a 150-mesh sieve, and add nano-Al which accounts for 33% of the magnetic powder weight to the magnetic powder 2 o 3 Dispersion liquid and 1.2% sodium silicate powder, in which nano-Al 2 o 3 Al in the dispersion 2 o 3 The weight concentration is 5%, after stirring evenly, heat it to 50°C, keep it warm and keep stirring until the magnetic powder slurry is dry, and grind the dried magnetic powder slurry to obtain coated magnetic powder; add 1.0% of the weight of the coated magnetic powder to the coated magnetic powder Zinc stearate powder and mixed evenly, then put into the hydroforming machine, using 12.4 tons / cm 2 Φ26.92×Φ14.73×11.18, that is, an annular powder core with an outer diameter of 26.92mm, an inner diameter of 14.73mm, and a height of 11.18mm; the powder core is heated in a tube furnace with hydrogen as a protective atmosphere Heat it to 500°C and keep it warm for 120 minutes, then cool it with the furn...

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Abstract

The invention discloses a preparation method of a metal soft magnetic powder core, which aims at solving the technical problems of high pollution, high cost and poor magnetic stability in the prior art. The method comprises the steps of raw material sieving, insulation coating, to-be-formed magnetic powder preparation, pressure forming, heat treatment and surface spraying. The method has the technical benefits that a preparation technique is simple; used equipment is simple; the insulation coating is conducted on magnetic powder with nano oxide dispersion liquid; a using effect is good; an environment is not polluted; the raw material cost is low; an organic solvent and an organic binder are not used in a preparation process; soaking and solidification treatment is not conducted; the method is low in cost and pollution-free; and the metal soft magnetic powder core prepared by the method has good magnetic stability, a higher quality factor and lower magnetic core loss.

Description

technical field [0001] The invention belongs to the technical field of preparation of magnetic materials, in particular to a method for preparing a metal soft magnetic powder core. Background technique [0002] Metal soft magnetic powder core is a kind of composite soft magnetic material which is uniformly pressed by ferromagnetic metal powder and insulating medium. Because the magnetic powder particles are small, the magnetic powder is separated from each other by the insulating medium, the resistivity of the magnetic powder core is high, and the eddy current loss is small, so it is suitable for higher frequencies. Metal soft magnetic powder cores also have the advantages of high saturation magnetic induction, good frequency characteristics and temperature stability, and are mainly used to design and manufacture various high-performance electronic components, such as inductors, filters, transformers and Choke coils, etc., which are widely used in electronic communications,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/147H01F1/22H01F1/24B22F1/02B22F3/02
Inventor 苏海林杨敏吴玉程赵永辉孙志国马绪阳
Owner HEFEI UNIV OF TECH
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