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An amorphous nanocrystalline composite magnetic powder core and a preparation method thereof

An amorphous, nanocrystalline, and magnetic powder core technology, which is applied in the field of magnetic powder cores, can solve the problems of magnetic permeability, coercive force, soft magnetic properties and mechanical properties that are difficult to balance at the same time, poor mechanical strength, and magnetic core damage.

Active Publication Date: 2018-12-18
SICHUAN UNIV
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Problems solved by technology

[0003] The amorphous and nanocrystalline magnetic powder core obtained by the currently disclosed magnetic powder core preparation process is difficult to simultaneously balance soft magnetic properties and mechanical properties such as magnetic permeability, coercive force, and magnetic powder core loss.
The application document with the application number CN201310410905.1 discloses an amorphous nanocrystalline composite magnetic powder core and its preparation method. The amorphous nanocrystalline composite magnetic powder core is mainly composed of iron-based amorphous powder, iron-based nanocrystalline powder, organic bonded The composite magnetic powder core is composed of a mixture of inorganic oxides, carbides and nitrides as the insulating agent, which improves the soft magnetic properties and mechanical properties of the magnetic powder core, but its magnetic permeability is only about 60. , the compressive strength is less than 500MPa. It can be seen that the soft magnetic properties and mechanical properties of this composite magnetic powder core are still poor, and it is difficult to meet the technical requirements of magnetic powder cores used as inductors and transformer components.
The application document with the application number 201510961792.3 discloses a preparation method of an amorphous nanocrystalline soft magnetic powder core, which is solidified under pressure and soaked in an inorganic binder (including silicate, phosphate, sulfate and borate) solution. , annealing treatment, epoxy resin organic binder solution soaking and curing treatment to obtain amorphous nanocrystalline soft magnetic powder core; the magnetic powder core obtained by this preparation method has a density of about 5.5 to 5.8, which is much lower than that of pure iron. Theoretical density, which will result in lower magnetic permeability, higher coercive force, and poorer mechanical strength
The application document with the application number 201210206560.3 discloses a method for preparing a high-performance nanocrystalline magnetic powder core. The iron-based amorphous strip is subjected to heat treatment, crushing, ball milling, and screening in sequence, and then the obtained product is mixed with a sodium silicate binder Mixing, after pressing and annealing, coating with insulating resin to obtain high-performance nanocrystalline magnetic powder core, the magnetic permeability of the magnetic powder core obtained by this preparation method is only about 60, and the magnetic core damage is 250-300mW / cm 3 , it can be seen that the soft magnetic properties and mechanical properties of this magnetic powder core are still poor, and it is difficult to meet the technical requirements of magnetic powder cores used as inductors and transformer components.

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  • An amorphous nanocrystalline composite magnetic powder core and a preparation method thereof
  • An amorphous nanocrystalline composite magnetic powder core and a preparation method thereof
  • An amorphous nanocrystalline composite magnetic powder core and a preparation method thereof

Examples

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Effect test

Embodiment 1～3

[0072] (11) Heat treatment of iron-based amorphous nanocrystalline magnetic powder

[0073] Will Fe 73.5 Si 13.5 B 9 Nb 3 Cu Fe-based amorphous and nanocrystalline magnetic powder was heat-treated in vacuum at 350°C for 1.5h, and the vacuum degree was 10 -1 Above Pa level.

[0074] (12) Preparation of nanoscale glass powder

[0075] Mix ethyl orthosilicate, ethanol, nitric acid and acetic acid in a molar ratio of 1:7:0.02:0.05, and stir vigorously at room temperature for about 0.5h until ethyl orthosilicate is completely prehydrolyzed to form the first mixture containing prehydrolyzed products liquid; the LiOH·H 2 O dissolved in LiOH·H 2 Obtain the first solution in the nitric acid of the amount of O twice substance; Ca(OH) 2 Soluble in Ca(OH) 2 nitric acid twice as much as the substance, to obtain a second solution; the H 3 BO 3 Soluble in H 3 BO 3 The deionized water of twice the amount of substance, obtains the 3rd solution; Will (Al(NO 3 ) 3 )·9H 2 O dissol...

Embodiment 4

[0083] (11) Heat treatment of iron-based amorphous nanocrystalline magnetic powder

[0084] Will Fe 73.5 Si 13.5 B 9 Nb 3 Cu Fe-based amorphous and nanocrystalline magnetic powder was heat-treated in vacuum at 400 °C for 1 h, and the vacuum degree was 10 -1 Above Pa level.

[0085] (12) Preparation of nanoscale glass powder

[0086] Mix ethyl orthosilicate, ethanol, nitric acid and acetic acid in a molar ratio of 1:7:0.02:0.05, and stir vigorously at room temperature for about 0.5h until ethyl orthosilicate is completely prehydrolyzed to form the first mixture containing prehydrolyzed products liquid; the LiOH·H 2 O dissolved in LiOH·H 2 Obtain the first solution in the nitric acid of the amount of O twice substance; Ca(OH) 2 Soluble in Ca(OH) 2 nitric acid twice as much as the substance, to obtain a second solution; the H 3 BO 3 Soluble in H 3 BO 3 The deionized water of twice the amount of substance, obtains the 3rd solution; Will (Al(NO 3 ) 3 )·9H 2 O dissol...

Embodiment 5

[0092] (11) Heat treatment of iron-based amorphous nanocrystalline magnetic powder

[0093] Will Fe 73.5 Si 13.5 B 9 Nb 3 Cu Fe-based amorphous and nanocrystalline magnetic powder was heat-treated in vacuum at 300°C for 1.5h, and the vacuum degree was 10 -1 Above Pa level.

[0094] (12) Preparation of nanoscale glass powder

[0095] Mix ethyl orthosilicate, ethanol, nitric acid and acetic acid in a molar ratio of 1:7:0.02:0.05, and stir vigorously at room temperature for about 0.5h until ethyl orthosilicate is completely prehydrolyzed to form the first mixture containing prehydrolyzed products liquid; the LiOH·H 2 O dissolved in LiOH·H 2 Obtain the first solution in the nitric acid of the amount of O twice substance; Ca(OH) 2 Soluble in Ca(OH) 2 nitric acid twice as much as the substance, to obtain a second solution; the H 3 BO 3 Soluble in H 3 BO 3 The deionized water of twice the amount of substance, obtains the 3rd solution; Will (Al(NO 3 ) 3 )·9H 2 O dissol...

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Abstract

The invention discloses an amorphous nanocrystalline composite magnetic powder core and a preparation method thereof, and the amorphous nanocrystalline composite magnetic powder core is prepared fromFe-based amorphous nanocrystalline magnetic powder and nano-grade glass powder / micron-grade glass powder through spark plasma sintering. The amorphous nanocrystalline composite magnetic powder core has high permeability, high density, low magnetic loss and low coercivity, so the amorphous nanocrystalline composite magnetic powder core has excellent soft magnetic and mechanical properties, and canbe widely used for manufacturing high-power switching power supplies, high-power inductors and high-efficiency energy-saving motors and other equipment.

Description

technical field [0001] The invention belongs to the technical field of magnetic powder cores, and relates to an amorphous nanocrystalline composite magnetic powder core and a preparation method thereof. Background technique [0002] With the rapid development of technologies such as power electronics, electronic information and new energy, higher requirements are put forward for the electrical performance, reliability, energy saving and size miniaturization of components such as inductors and transformers. The soft magnetic properties of the magnetic powder core, which is an important part of the component, include high magnetic permeability, high saturation magnetic flux, high work efficiency and low magnetic permeability. At present, the research and development of magnetic powder cores include five categories: pure iron powder cores, sendust powder cores, permalloy powder cores, ferrite cores, and amorphous and nanocrystalline magnetic powder cores. Compared with the oth...

Claims

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Application Information

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IPC IPC(8): H01F1/153H01F41/02
CPCH01F1/15341H01F1/15366H01F41/0246
Inventor 周廷川刘颖李军叶金文王仁全赵伟
Owner SICHUAN UNIV
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