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Preparation method of MnO-SiO2 insulation coated metal soft magnetic powder core

A technology of insulation coating and metal soft magnetism, which is applied in the manufacture of inductors/transformers/magnets, preventing/reducing unwanted electric/magnetic effects, parts of transformers/inductors, etc., and can solve the problem of oxide coating methods Uneven coating, easy aging of the coating layer, easy falling off of the coating layer, etc., to achieve the effects of not easy to decompose and fall off, avoid aging problems, and low production cost

Pending Publication Date: 2022-05-17
HEFEI ECRIEE TAMURA ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the coating methods of metal soft magnetic powder cores are mainly divided into organic coating and inorganic coating. The organic coating method has a relatively uniform coating layer but has disadvantages such as easy aging and high temperature resistance; There are two types of oxidation and oxide coating methods. The phosphoric acid passivation layer will decompose at about 600 ° C. There are similar problems to the organic coating method. The oxide coating method has high resistivity and high temperature resistance due to the high resistivity of the coating layer. The advantage has become the preferred coating method of metal soft magnetic powder core at present, but the oxide coating method still has problems such as uneven coating and easy peeling off of the coating layer.

Method used

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  • Preparation method of MnO-SiO2 insulation coated metal soft magnetic powder core
  • Preparation method of MnO-SiO2 insulation coated metal soft magnetic powder core
  • Preparation method of MnO-SiO2 insulation coated metal soft magnetic powder core

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] (1) 12gMnO 2 Add 0.12gKH550 and 6gH 2 O mixed solution, and mechanically stirred for 1h to obtain the modified MnO 2 mixed solution;

[0040] (2) Add 300 g of sendust magnetic powder and 6 g of ethanol to the mixed solution in step (1), stir mechanically for 1 h, and then dry at 120° C. for 1 h to obtain MnO 2 Insulation-coated sendust powder;

[0041] (3) MnO obtained in step (2) 2 The sendust powder after the insulation coating is passed through a 200-mesh sieve, sieved and granulated, then weighed 200g of the granulated powder, and added 0.6g of resin binder and 0.8g of zinc stearate to mix evenly, and then used The hydraulic press performs two-way floating pressing under the pressure of 1860MPa, and the density is 5.73g / cm 3 green body;

[0042] (4) Annealing treatment: place the green body obtained in step (3) in an annealing furnace, and pass nitrogen gas into it, exhaust the air in the furnace, and under the protection of nitrogen gas, heat up at a rate of ...

Embodiment 2

[0049] (1) 24gMnO 2 Add 0.24gKH550 and 12gH 2 O mixed solution, and mechanically stirred for 1h to obtain the modified MnO 2 mixed solution;

[0050] (2) Add 300 g of sendust magnetic powder and 12 g of ethanol to the mixed solution in step (1), stir mechanically for 1 h, and then dry at 120° C. for 1 h to obtain MnO 2 Insulation-coated sendust powder;

[0051] (3) MnO obtained in step (2) 2 The sendust powder after the insulation coating is passed through a 200-mesh sieve, sieved and granulated, then weighed 200g of the granulated powder, and added 0.6g of resin binder and 0.8g of zinc stearate to mix evenly, and then used The hydraulic press performs two-way floating pressing under the pressure of 1860MPa, and the density is 5.58g / cm 3 green body;

[0052] (4) Annealing treatment: place the green body obtained in step (3) in an annealing furnace, and pass nitrogen gas into it, exhaust the air in the furnace, and under the protection of nitrogen gas, heat up at a rate o...

Embodiment 3

[0059] (1) 30gMnO 2 Add 0.3gKH550 and 15gH 2 O mixed solution, and mechanically stirred for 1h to obtain the modified MnO 2 mixed solution;

[0060] (2) Add 300 g of ferrosilicon magnetic powder and 15 g of ethanol to the mixed solution in step (1), stir mechanically for 1 h, and then dry at 120 ° C for 1 h to obtain MnO 2 Iron-silicon powder after insulation coating;

[0061] (3) MnO obtained in step (2) 2 The sendust powder after the insulation coating is passed through a 200-mesh sieve, sieved and granulated, then weighed 200g of the granulated powder, and added 0.6g of resin binder and 0.8g of zinc stearate to mix evenly, and then used The hydraulic press performs two-way floating pressing under the pressure of 1860MPa, and the density is 6.08g / cm 3 green body;

[0062] (4) Annealing treatment: place the green body obtained in step (3) in an annealing furnace, and pass nitrogen gas into it, exhaust the air in the furnace, and under the protection of nitrogen gas, hea...

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Abstract

The invention is suitable for the field of metal soft magnetic powder cores, and provides a MnO-SiO2 insulation coated metal soft magnetic powder core preparation method which comprises the following steps: adding a silane coupling agent into MnO2 powder, and modifying the MnO2 powder to enable the MnO2 powder to be rich in hydroxylation; adding metal magnetic powder and ethanol into the modified MnO2 mixed solution, stirring and drying to obtain MnO2 insulated and coated metal magnetic powder; sieving the obtained MnO2 insulation coated metal magnetic powder, performing sieving granulation, and performing pressurization to prepare a green body; and the obtained green body is heated and annealed, and a MnO-SiO2 insulation coated metal soft magnetic powder core finished product is obtained. The MnO2 coating layer is converted into the MnO-SiO2 coating layer through high-temperature annealing, the MnO-SiO2 coating insulating layer generated through in-situ reaction of Si in the metal magnetic powder and MnO2 is uniform and compact, the MnO-SiO2 coating layer is resistant to high temperature and not prone to decomposition and falling off, and the problem that the phosphoric acid passivation layer is prone to decomposition at high temperature is effectively solved.

Description

technical field [0001] The invention belongs to the field of metal soft magnetic powder cores, in particular to a MnO-SiO 2 The invention discloses a method for preparing an insulation-coated metal soft magnetic powder core. Background technique [0002] Metal soft magnetic powder cores are used as important functional materials in switching power supplies due to their high saturation magnetic induction, good frequency stability, excellent DC bias performance, and low eddy current loss. They are widely used in communication power supplies, electric vehicles, and inverters. Inverter, inverter air conditioner and other fields. [0003] The preparation of metal soft magnetic powder core mainly increases the demagnetization field between particles and reduces eddy current loss by insulating and coating metal magnetic powder, and improves its anti-saturation ability, thereby increasing its application frequency range. Therefore, high resistivity, high temperature resistance, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02H01F1/24H01F1/147H01F27/255H01F27/34
CPCH01F41/02H01F41/0246H01F1/24H01F1/14791H01F1/14766H01F27/255H01F27/34H01F2027/348
Inventor 关婉婉胡锋李明玲刘国安苏海林张艳万静龙张德光王玲
Owner HEFEI ECRIEE TAMURA ELECTRIC
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