A material and a method for improving the density of a magnetic powder core insulating layer

A magnetic powder core and magnetic powder technology, applied in the fields of inorganic material magnetism, inductance/transformer/magnet manufacturing, electrical components, etc., can solve the problem that the coating thickness and distribution state affect the pressing performance, the degree of mold damage, less industrial applications, and more synthesis steps, etc. problem, to achieve good magnetic performance stability, cost-free pollution, and simple production process.

Active Publication Date: 2018-12-28
ZHEJIANG KEDA MAGNETOELECTRICITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Simultaneously, due to factors such as complex process and many synthesis steps of Mn and Zn ferrites used in this invention, large-scale industrial application is less
[0004] The coating of oxide can improve the insulation more effectively, but the thickness and distribution of the coating affect the pressing performance and the degree of damage to the mold

Method used

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  • A material and a method for improving the density of a magnetic powder core insulating layer
  • A material and a method for improving the density of a magnetic powder core insulating layer
  • A material and a method for improving the density of a magnetic powder core insulating layer

Examples

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Effect test

Embodiment 1

[0026] Step 1) Take 1 kg of sendust magnetic powder produced by ordinary crushing method, and sieve it through a 140-mesh sieve, and the magnetic powder particle size is 30-77 μm, accounting for more than 95%;

[0027] Step 2) Add a metal surface modifier accounting for 2% of the weight of the metal magnetic powder to the metal magnetic powder. In order to disperse the surface modifier better, use 10 g of water as a diluent, stir the metal magnetic powder evenly, and react for 15 minutes to form a dry magnetic powder. material;

[0028] Step 3) Insulation coating: Pour 3.5g of phosphoric acid into the dry slurry, mix and stir, add 15g of water as a diluent, stir the magnetic powder for more than 15min to form a magnetic powder slurry, heat the slurry to 40°C-80°C and keep it warm Stir until the magnetic powder slurry is dry;

[0029] Step 4) Pour the inorganic insulating powder glass powder into the slurry obtained in step 3), mix and stir, dry and grind to obtain coated magn...

Embodiment 2

[0040] Step 1) Take 1 kg of iron-silicon magnetic powder prepared by gas atomization method, and sieve it through a 160-mesh sieve, and the magnetic powder particle size is 30-77 μm, accounting for more than 95%;

[0041] Step 2) Add a metal surface modifier accounting for 2.5% of the weight of the metal magnetic powder to the metal magnetic powder. In order to disperse the surface modifier better, use 8g of water as a diluent, stir the metal magnetic powder evenly, and react for 15 minutes to form a dry magnetic powder. material;

[0042] Step 3) Insulation coating: Pour 4.5g of phosphoric acid into the dry slurry, mix and stir, add 15g of absolute ethanol as a diluent, stir the magnetic powder for more than 20 minutes to form a magnetic powder slurry, make it fully react and dry;

[0043] Step 4) Pour the inorganic insulating powder kaolin powder into the slurry, mix and stir, grind after drying to obtain the coated magnetic powder; the powder coated with insulation can be o...

Embodiment 3

[0054] Step 1) Take 1 kg of sendust magnetic powder prepared by vacuum smelting and crushing method, pass through a 140-mesh sieve, and the magnetic powder particle size is 30-77 μm, accounting for more than 95%;

[0055] Step 2) Add a metal surface modifier accounting for 1.8% of the weight of the metal magnetic powder to the metal magnetic powder. In order to disperse the surface modifier better, use 10 g of water as a diluent, stir the metal magnetic powder evenly, and react for 15 minutes to form a dry magnetic powder. material;

[0056] Step 3) Insulation coating: Pour 4.5g of phosphoric acid into the dry slurry, mix and stir, add 15.5g of water as a diluent, stir the magnetic powder for more than 15min to form a magnetic powder slurry, heat the slurry to 40°C-80°C and keep it warm. Stir continuously until the magnetic powder slurry is dry;

[0057] Step 4) Pour the inorganic insulating powder glass powder into the slurry, mix and stir, dry and grind to obtain the coated...

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Abstract

A method for preparing a metal soft magnetic powder core comprises the following steps: step 1) selecting a metal magnetic powder, wherein the metal magnetic powder is ferrosilicon aluminum magnetic powder or ferrosilicon magnetic powder, and the particle size is 30-77 mum, accounting for more than 95%; 2) dissolving the metal surface conditioner in water, wherein the weight ratio of solute to solvent is 1:10 to 1:4; after the solution is prepared, adding the solution to metal magnetic powder, performing stirring, and leaving the powder for later use after drying, wherein the adding quantity is 1 to 5 percent of the mass of the metal magnetic powder; 3) performing insulation coating: continuously carrying out insulation coating on the metal magnetic powder treated by the surface regulatingagent; 4) pouring the inorganic insulating powder into the slurry obtained in the step 3), mixing and stirring, drying, and grinding the dried magnetic powder to obtain coating magnetic powder; 5) adding demoulding agent accounting for 0.3 to 1.0 percent of the weight of the coating magnetic powder and uniformly mixing the demoulding agent to obtain the magnetic powder to be made; 6) pressing andmolding: the magnetic powder to be molded is made into a magnetic powder core blank by a press, wherein the press applied by the press is 14 to 24 ton / cm<2>.

Description

technical field [0001] The invention relates to the technical field of soft magnetic materials and powder metallurgy, in particular to a method capable of improving the insulation of alloy soft magnetic materials and a method for using the same. 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. Nowadays, when designing and manufacturing choke coils and inductors of various switching power supplies, sendust magnetic powder cores, iron-nickel magnetic powder cores and iron-nickel-molybdenum magnetic powder cores are basically used. Inverters and reactors are used in high-power power conversion. When using more iron-silicon. With more and more functions concentrated in power electronic equipment, the increased power consumption per unit area increases exponentially, which brings greater losses to various components. The development of today...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02H01F1/24
CPCH01F1/24H01F41/0246
Inventor 聂军武柯昕何文浩杨敏严露
Owner ZHEJIANG KEDA MAGNETOELECTRICITY
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