CN112700960A - Method for insulating and coating metal soft magnetic powder core and high-strength bonding - Google Patents
Method for insulating and coating metal soft magnetic powder core and high-strength bonding Download PDFInfo
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- CN112700960A CN112700960A CN202011479391.1A CN202011479391A CN112700960A CN 112700960 A CN112700960 A CN 112700960A CN 202011479391 A CN202011479391 A CN 202011479391A CN 112700960 A CN112700960 A CN 112700960A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0206—Manufacturing of magnetic cores by mechanical means
- H01F41/0246—Manufacturing of magnetic circuits by moulding or by pressing powder
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
- H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
- H01F1/20—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder
- H01F1/22—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together
- H01F1/24—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together the particles being insulated
- H01F1/26—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together the particles being insulated by macromolecular organic substances
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- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
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- Powder Metallurgy (AREA)
- Soft Magnetic Materials (AREA)
Abstract
The invention discloses a method for insulating and coating a metal soft magnetic powder core and bonding the metal soft magnetic powder core at high strength, which comprises the following steps: (1) sieving the iron-based magnetic powder to carry out grain size distribution; (2) insulating and coating by adopting silica sol or silicate suspension liquid and drying; (3) uniformly mixing the dried magnetic powder with a silane coupling agent, mixing with liquid silicon resin, and drying; adding the demoulding powder, dry-pressing and forming, and carrying out heat treatment under the protection of nitrogen to obtain the magnetic powder core. The invention adopts inorganic matters and organic matters to carry out insulation coating and bonding on the magnetic powder, the coating layer is uniform and controllable in thickness, and has high thermal stability and high resistance; the prepared magnetic powder core has high strength and excellent magnetic performance; the method for insulating and coating the magnetic powder has strong operability and is convenient for batch production.
Description
Technical Field
The invention relates to the technical field of magnetic materials, in particular to a method for insulating and coating a metal soft magnetic powder core and bonding the metal soft magnetic powder core at high strength.
Background
The soft magnetic metal powder core is a novel soft magnetic functional material which is prepared by using alloy powder as a raw material, coating a layer of insulating material on the surface of the magnetic powder, and performing compression molding and heat treatment annealing. The insulating coating and bonding are key links, and play a decisive role in improving the overall resistivity, reducing the eddy current loss and improving the comprehensive electro-magnetic performance and mechanical performance. The following requirements are placed on the insulation coating and the adhesion of the magnetic powder: (1) the coating material has high resistivity, and can effectively reduce eddy current loss; (2) the coating material has high thermal stability and can be subjected to heat treatment at high temperature without decomposition; (3) the coating method has strong controllability, and the coating layer is compact, complete and uniform; (4) the interface bonding strength of the alloy/insulating layer is high, and the cladding layer is not broken and falls off in the pressing forming process; (5) the magnetic powder core of the pressed blank after heat treatment has certain strength and does not need to be enhanced by epoxy resin.
The insulating coating is generally classified into an organic coating and an inorganic coating. The organic coating agent mainly comprises thermosetting resin (such as epoxy resin, phenolic resin, silicon resin and the like) and thermoplastic resin (such as polyethylene, polyamide and the like), and the organic substances have strong caking property and can ensure that the magnetic powder core has enough strength, but the organic substances have lower heat-resistant temperature and are easy to decompose in the high-temperature annealing process, and the surface film layer of the magnetic powder is difficult to keep insulation in the high-temperature heat treatment, so the magnetic performance of the magnetic powder core is deteriorated. Inorganic coatings can be divided into: phosphates (zinc, iron and manganese phosphates), oxides (SiO)2MgO, and ferrite), silicates, and the like. The inorganic substance has higher heat-resisting temperature, can meet the requirement of magnetic powder core heat treatment, has high resistivity and low eddy current loss at high frequency, and is an excellent insulating coating agent. However, the inorganic substances have poor caking property, and the magnetic powder has difficult cardiac performance to meet the application requirement when no other caking agents exist.
Disclosure of Invention
The invention aims to overcome the problems in the prior art and provides a method for insulating and coating a metal soft magnetic powder core and bonding the metal soft magnetic powder core at high strength.
In order to achieve the technical purpose and achieve the technical effect, the invention is realized by the following technical scheme:
a method for insulating and coating and high-strength bonding of a metal soft magnetic powder core comprises the following steps:
(1) the particle size ratio is as follows: sieving metal magnetic powder, and then performing particle size matching, wherein the metal magnetic powder is iron-silicon-aluminum magnetic powder, iron-silicon magnetic powder, iron-nickel magnetic powder or iron-nickel-molybdenum magnetic powder;
(2) coating and bonding treatment: adding silica sol or silicate suspension into metal magnetic powder, stirring at 60-150 deg.C, and drying; adding a coupling agent into the dried magnetic powder, and uniformly stirring; adding silicone resin, stirring uniformly at 80-150 deg.C, and drying to obtain insulated magnetic powder;
(3) forming and heat treatment: adding lubricating powder into the dried insulated magnetic powder, pressing and molding under the pressure of 1000-750 MPa, and carrying out heat treatment on the magnetic powder core blank body for 30-60min in a nitrogen atmosphere at the temperature of 650-750 ℃.
Further, according to the method for insulating and coating the metal soft magnetic powder core and bonding the metal soft magnetic powder core at high strength, in the step (2), when silica sol is selected, the adding amount of the silica sol is 0.1-4% of the mass of the metal magnetic powder; when the silicate suspension is selected, the adding amount of silicate in the silicate suspension is 0.04-2% of the mass of the metal magnetic powder.
Further, in the method for insulating and coating the metal soft magnetic powder core and bonding the metal soft magnetic powder core at high strength, in the step (2), the silicate in the silicate suspension is kaolin, montmorillonite or mica.
Further, in the method for insulating and coating the core of the metal soft magnetic powder and bonding the core at high strength as described above, in the step (2), the amount of the coupling agent added is 0.001 to 0.2 wt% of the mass of the metal magnetic powder.
Further, in the method for insulating and coating and high-strength bonding of the metal soft magnetic powder core, in the step (2), the coupling agent is amino silane, vinyl silane coupling agent or epoxy silane coupling agent.
Further, in the method for insulating and coating the metal soft magnetic powder core and bonding the metal soft magnetic powder core at high strength, in the step (2), the addition amount of the silicone resin is 0.1-2% of the mass of the metal magnetic powder.
Further, in the method for insulating and coating the metal soft magnetic powder core and bonding the metal soft magnetic powder core at high strength, in the step (3), the lubricating powder is zinc stearate, barium stearate, calcium stearate, molybdenum disulfide or synthetic wax powder.
The invention has the beneficial effects that:
the invention adopts inorganic matters and organic matters to carry out insulation coating and bonding on the magnetic powder, the coating layer is uniform and controllable in thickness, and has high thermal stability and high resistance; the prepared magnetic powder core has high strength and excellent magnetic performance; the method for insulating and coating the magnetic powder has strong operability and is convenient for batch production.
Of course, it is not necessary for any one product that embodies the invention to achieve all of the above advantages simultaneously.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A method for insulating and coating and high-strength bonding of a metal soft magnetic powder core comprises the following steps:
(1) the particle size ratio is as follows: gas atomization iron-silicon-aluminum magnetic powder is mixed according to the following weight ratio:
200-grade 300 mesh 40%
300-400 mesh 45%
Not less than 400 meshes and 15 percent.
(2) Coating and bonding treatment: adding silica sol accounting for 3% of the mass of the magnetic powder into the magnetic powder, stirring uniformly at 90 ℃ and drying; adding gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane with the mass of 1.5 wt% of the magnetic powder into the dried magnetic powder, and uniformly stirring; then adding silicon resin accounting for 1.0 percent of the mass of the magnetic powder, stirring uniformly at 110 ℃ and drying to obtain the insulated magnetic powder.
(3) Forming and heat treatment: drying the magnetic powder, adding lubricating powder, mixing well, molding under 2000Mp pressure, pressing into annular blank with outer diameter of 27.0mm, inner diameter of 14.7mm and thickness of 11.1mm, and heat treating in nitrogen atmosphere at 700 deg.C for 60 min.
The finally prepared sendust cores were tested and the properties are shown in table 1:
TABLE 1
Example 2
A method for insulating and coating and high-strength bonding of a metal soft magnetic powder core comprises the following steps:
(1) the particle size ratio is as follows: the iron-silicon magnetic powder is mixed according to the following weight ratio:
(2) coating and bonding treatment: adding kaolin (in suspension form) 2.5% of the magnetic powder into the magnetic powder, stirring at 120 deg.C, and drying; adding gamma-aminopropyl trimethoxy silane with the mass of 0.01 wt% of the magnetic powder into the dried magnetic powder, and uniformly stirring; then adding silicone resin with the mass of 0.5 wt% of the magnetic powder, stirring uniformly at 100 ℃ and drying to obtain the insulated magnetic powder.
(3) Forming and heat treatment: drying the magnetic powder, adding lubricating powder, mixing uniformly, molding under 1200Mp pressure, pressing into annular blank with outer diameter of 17.2mm, inner diameter of 9.6mm and thickness of 6.3mm, and heat treating at 680 deg.C in nitrogen atmosphere for 60 min.
The finally prepared iron-silicon magnetic powder core is tested, and the properties are shown in table 2:
TABLE 2
Example 3
A method for insulating and coating and high-strength bonding of a metal soft magnetic powder core comprises the following steps:
(1) the particle size ratio is as follows: the iron-nickel magnetic powder is mixed according to the following weight ratio:
(2) coating and bonding treatment: adding montmorillonite (in suspension form) 0.5% of the magnetic powder mass into the magnetic powder, stirring at 110 deg.C, and drying; adding vinyltriethoxysilane with the mass of 0.001 wt% of the magnetic powder into the dried magnetic powder, and uniformly stirring; then adding silicon resin accounting for 0.1 percent of the mass of the magnetic powder, stirring uniformly at 90 ℃ and drying to obtain the insulated magnetic powder.
(3) Forming and heat treatment: drying the magnetic powder, adding lubricating powder, mixing well, molding under 1800Mp pressure, pressing into annular blank with outer diameter of 27.0mm, inner diameter of 14.7mm and thickness of 11.1mm, and heat treating at 680 deg.C in nitrogen atmosphere for 60 min.
The finally prepared iron-nickel magnetic powder core is tested, and the properties are shown in table 3:
TABLE 3
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (7)
1. A method for insulating and coating and high-strength bonding of a metal soft magnetic powder core is characterized by comprising the following steps:
(1) the particle size ratio is as follows: sieving metal magnetic powder, and then performing particle size matching, wherein the metal magnetic powder is iron-silicon-aluminum magnetic powder, iron-silicon magnetic powder, iron-nickel magnetic powder or iron-nickel-molybdenum magnetic powder;
(2) coating and bonding treatment: adding silica sol or silicate suspension into metal magnetic powder, stirring at 60-150 deg.C, and drying; adding a coupling agent into the dried magnetic powder, and uniformly stirring; adding silicone resin, stirring uniformly at 80-150 deg.C, and drying to obtain insulated magnetic powder;
(3) forming and heat treatment: adding lubricating powder into the dried insulated magnetic powder, pressing and molding under the pressure of 1000-750 MPa, and carrying out heat treatment on the magnetic powder core blank body for 30-60min in a nitrogen atmosphere at the temperature of 650-750 ℃.
2. The method of claim 1, wherein the metal soft magnetic powder core is coated with an insulating material and bonded at high strength, and the method comprises the steps of: in the step (2), when the silica sol is selected, the adding amount of the silica sol is 0.1-4% of the mass of the metal magnetic powder; when the silicate suspension is selected, the adding amount of silicate in the silicate suspension is 0.04-2% of the mass of the metal magnetic powder.
3. The method of claim 1, wherein the metal soft magnetic powder core is coated with an insulating material and bonded at high strength, and the method comprises the steps of: in the step (2), the silicate in the silicate suspension is kaolin, montmorillonite or mica.
4. The method of claim 1, wherein the metal soft magnetic powder core is coated with an insulating material and bonded at high strength, and the method comprises the steps of: in the step (2), the adding amount of the coupling agent is 0.001-0.2 wt% of the mass of the metal magnetic powder.
5. The method of claim 1, wherein the metal soft magnetic powder core is coated with an insulating material and bonded at high strength, and the method comprises the steps of: in the step (2), the coupling agent is amino silane, vinyl silane or epoxy silane.
6. The method of claim 1, wherein the metal soft magnetic powder core is coated with an insulating material and bonded at high strength, and the method comprises the steps of: in the step (2), the addition amount of the silicone resin is 0.1-2% of the mass of the metal magnetic powder.
7. The method of claim 1, wherein the metal soft magnetic powder core is coated with an insulating material and bonded at high strength, and the method comprises the steps of: in the step (3), the lubricating powder is zinc stearate, barium stearate, calcium stearate, molybdenum disulfide or synthetic wax powder.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104028750A (en) * | 2014-06-05 | 2014-09-10 | 浙江大学 | High-bonding-strength insulated coating treatment method of metal soft magnetic composite material |
| CN104368807A (en) * | 2013-08-13 | 2015-02-25 | 东睦新材料集团股份有限公司 | Power coating method of metal soft magnetic composite and preparing method of metal soft magnetic composite |
| CN108242309A (en) * | 2017-12-14 | 2018-07-03 | 东睦新材料集团股份有限公司 | Improve the material preparation method of direct current biasing characteristic and the preparation method of powder core |
| US20180281061A1 (en) * | 2015-10-06 | 2018-10-04 | Ntn Corporation | Pressed powder magnetic core material, pressed powder magnetic core, and production method thereof |
| CN109103010A (en) * | 2018-08-02 | 2018-12-28 | 浙江东睦科达磁电有限公司 | A kind of material and its method improving powder core insulating layer consistency |
| CN111192757A (en) * | 2020-01-17 | 2020-05-22 | 浙江东睦科达磁电有限公司 | Insulation method for improving oxidation resistance of metal magnetic powder core and material thereof |
-
2020
- 2020-12-15 CN CN202011479391.1A patent/CN112700960A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104368807A (en) * | 2013-08-13 | 2015-02-25 | 东睦新材料集团股份有限公司 | Power coating method of metal soft magnetic composite and preparing method of metal soft magnetic composite |
| CN104028750A (en) * | 2014-06-05 | 2014-09-10 | 浙江大学 | High-bonding-strength insulated coating treatment method of metal soft magnetic composite material |
| US20180281061A1 (en) * | 2015-10-06 | 2018-10-04 | Ntn Corporation | Pressed powder magnetic core material, pressed powder magnetic core, and production method thereof |
| CN108242309A (en) * | 2017-12-14 | 2018-07-03 | 东睦新材料集团股份有限公司 | Improve the material preparation method of direct current biasing characteristic and the preparation method of powder core |
| CN109103010A (en) * | 2018-08-02 | 2018-12-28 | 浙江东睦科达磁电有限公司 | A kind of material and its method improving powder core insulating layer consistency |
| CN111192757A (en) * | 2020-01-17 | 2020-05-22 | 浙江东睦科达磁电有限公司 | Insulation method for improving oxidation resistance of metal magnetic powder core and material thereof |
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