CN114664554A - Preparation method of low-loss iron-nickel soft magnetic powder core for chip inverter - Google Patents

Preparation method of low-loss iron-nickel soft magnetic powder core for chip inverter Download PDF

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CN114664554A
CN114664554A CN202210363242.1A CN202210363242A CN114664554A CN 114664554 A CN114664554 A CN 114664554A CN 202210363242 A CN202210363242 A CN 202210363242A CN 114664554 A CN114664554 A CN 114664554A
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magnetic powder
iron
nickel
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汤凤林
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Yangzhou Lingchuangxin Material Technology Co ltd
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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
    • 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
    • H01F1/147—Alloys characterised by their composition
    • H01F1/14708—Fe-Ni based alloys
    • H01F1/14733—Fe-Ni based alloys in the form of particles
    • H01F1/14741—Fe-Ni based alloys in the form of particles pressed, sintered or bonded together
    • H01F1/1475—Fe-Ni based alloys in the form of particles pressed, sintered or bonded together the particles being insulated
    • 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
    • H01F1/147—Alloys characterised by their composition
    • H01F1/14708—Fe-Ni based alloys
    • H01F1/14733—Fe-Ni based alloys in the form of particles
    • H01F1/14741—Fe-Ni based alloys in the form of particles pressed, sintered or bonded together
    • H01F1/1475—Fe-Ni based alloys in the form of particles pressed, sintered or bonded together the particles being insulated
    • H01F1/14758—Fe-Ni based alloys in the form of particles pressed, sintered or bonded together the particles being insulated by macromolecular organic substances
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/24—Magnetic cores
    • H01F27/255—Magnetic cores made from particles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Chemical & Material Sciences (AREA)
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  • Manufacturing & Machinery (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Soft Magnetic Materials (AREA)
  • Powder Metallurgy (AREA)

Abstract

The invention discloses a preparation method of a low-loss iron-nickel soft magnetic powder core for a chip inverter, which is characterized in that iron-nickel soft magnetic powder with the granularity of less than 200 meshes is selected, attapulgite powder with 1000 meshes is used for carrying out lossless coating treatment on the surfaces of iron-nickel powder particles, the iron-nickel soft magnetic powder core with the effective magnetic conductivity of 60 is prepared, the iron-nickel soft magnetic powder core has excellent soft magnetic performance, particularly the Q value and the loss performance of the iron-nickel powder core can be greatly improved, and the volume loss Pcv under the conditions of 50kHz and 100mT is lower than 130mW/cm3。

Description

Preparation method of low-loss iron-nickel soft magnetic powder core for chip inverter
Technical Field
The invention belongs to the technical field of soft magnetic materials, and particularly relates to a preparation method of a low-loss iron-nickel soft magnetic powder core for a chip inverter.
Background
The metal soft magnetic powder core has the advantages of high resistivity, high magnetic flux density, low coercive force, low loss and the like, and is widely applied to electronic components such as filters, boost inductors, differential mode inductors and the like by virtue of excellent comprehensive soft magnetic properties. With the development of power electronic devices toward high power, the metal soft magnetic powder core is required to have low loss and excellent direct current saturation resistance. Particularly, in an alternating current-direct current converter, when the direct current saturation resistance can not meet the requirements of devices, the inductance is easily and rapidly attenuated, the loss is too high, and the circuit ripple is too large. In particular, in the field of chip inverter application, a higher dc bias characteristic and excellent performance stability are required, so that soft magnetic powder core devices represented by iron and nickel are widely used.
In patent CN102214510B, an iron-nickel alloy soft magnetic material and a manufacturing method thereof are disclosed, wherein phosphoric acid is mainly adopted to passivate the surface of iron-nickel powder, the iron-nickel powder is pressed and molded under the condition of 1500 MPa-2600 MPa, and iron-nickel powder cores with different inductance factors are prepared by heat treatment for 60-150 minutes under the condition of 600-900 ℃. Wherein, the power loss of the prepared 60 mu ferronickel powder core product under the conditions of 50kHz and 1000Gauss (100mT) is higher than 290mW/cm3The DC bias performance under the condition of 100Oe is 83.9-86.1%. Patent CN102314980B discloses an iron-nickel-molybdenum alloy soft magnetic material with magnetic permeability μ ═ 60 and a manufacturing method thereof, wherein iron-nickel-molybdenum soft magnetic powder with high price and high stability is selected in the patent, and the surface of the iron-nickel-molybdenum soft magnetic powder is subjected to insulation treatment by adopting phosphoric acid passivation treatment in the same way, so that the power loss of the prepared 60 μ iron-nickel-molybdenum powder core product under the conditions of 50kHz and 1000Gauss (100mT) is about 190mW/cm3The DC bias performance under the condition of 100Oe is only 56%, which is far lower than that of the ferrochrome powder core.
Disclosure of Invention
The invention provides a preparation method of a low-loss iron-nickel soft magnetic powder core for a chip inverter, aiming at the requirements of the field of electronic power devices on the performance improvement of the soft magnetic powder core, in particular to the requirements of the field of chip inverters on the direct current bias performance of the soft magnetic powder core, and the preparation method can effectively improve the loss performance and the direct current bias performance of the iron-nickel powder core and meet the application requirements of the field of chip inverters.
The invention discloses a preparation method of a low-loss iron-nickel soft magnetic powder core for a chip inverter, which comprises the following steps:
step 1: adding the water-based organic silicon resin, the attapulgite powder and water into the iron-nickel magnetic powder, and stirring and mixing uniformly at normal temperature to obtain mixed slurry;
step 2: heating the obtained mixed slurry, preserving heat, stirring, and sieving the dried powder after heat preservation to obtain insulating coated powder;
and step 3: adding a binder and a release agent into the insulating coated powder obtained in the step (2), and uniformly mixing to obtain magnetic powder to be molded;
and 4, step 4: pressing the magnetic powder to be molded prepared in the step 3 into a powder core blank by using a press;
and 5: under the protection of inert or reducing gas, preserving the heat of the powder core blank pressed and formed in the step 4 at 680-780 ℃ to obtain a semi-finished product of the magnetic powder core;
step 6: and (5) spraying an insulating and high-temperature-resistant epoxy resin coating on the surface of the semi-finished magnetic powder core obtained in the step (5) to obtain a finished metal soft magnetic powder core.
In the step 1, the particle size of the raw iron-nickel magnetic powder is less than or equal to 200 meshes, and the iron-nickel magnetic powder comprises the following components in percentage by mass: ni49.0-51.0 wt% and Fe for the rest. The particle size of the attapulgite powder is less than or equal to 1000 meshes.
In the step 1, the adding mass of the water-based organic silicon resin is 1.0-1.5 percent of the mass of the iron-nickel magnetic powder; the adding mass of the attapulgite powder is 1.5 to 3.0 percent of the mass of the iron-nickel magnetic powder; the adding mass of the water is 10.0-20.0% of the mass of the iron-nickel magnetic powder.
In step 1, the stirring time at normal temperature is 15 to 50 minutes, preferably 20 to 35 minutes.
In the step 2, the temperature of heating, heat preservation and stirring is controlled to be 80-120 ℃, and the heat preservation time is 20-60 minutes, preferably 30-40 minutes.
In the step 3, the adding mass of the binder is 0.1-0.5% of the mass of the iron-nickel magnetic powder; the addition mass of the release agent is 0.3-0.6% of the mass of the iron-nickel magnetic powder.
In the step 3, the binder is selected from one or more of siloxane resin, phenolic resin and polyamide resin; the release agent is selected from one or more of zinc stearate, calcium stearate, talcum powder and mica powder.
In the step 4, the pressing pressure is 1800 MPa-2200 MPa.
In step 5, the inert or reducing gas is argon, nitrogen, hydrogen, or the like.
In step 5, the heat preservation time is 50 minutes to 150 minutes, preferably 60 minutes to 120 minutes.
The effective magnetic conductivity of the low-loss iron-nickel soft magnetic powder core is 60. The direct current bias performance of the iron-nickel soft magnetic powder core under the condition of 100Oe is higher than 87%, and the volume loss Pcv under the conditions of 50kHz and 100mT is lower than 130mW/cm3。
The invention has the following beneficial effects:
(1) the invention relates to an insulation coating treatment for iron-nickel soft magnetic powder by adopting water-based organic silicon resin and attapulgite powder, belonging to a powder surface physical modification method. Compared with the conventional phosphoric acid passivation method, the method can effectively eliminate and avoid the corrosion damage effect on the surface of the metal powder, and can completely eradicate the harm effect of the acidic reagent on the environment.
(2) The invention adopts the water-based organic silicon resin as the powder surface modifier, and can be completely dissolved in water; carrying out insulation coating on the surface of the iron nickel powder by adopting attapulgite powder with the granularity of less than 1000 meshes; in addition, the water-based organic silicon resin and the attapulgite powder have viscosity, so that the strength of the iron-nickel powder core can be effectively improved, and the assembly requirements of subsequent magnetic core components are met.
(3) The preparation method is simple and convenient, the used solvent is water, the operation and the control are easy, and the cost is low.
(4) The low-loss iron-nickel soft magnetic powder core prepared by the invention has excellent soft magnetic performance, particularly the direct current bias performance and the loss performance of the soft magnetic powder core are greatly improved, and the performance requirements of the field of chip inverters on the metal soft magnetic powder core can be met.
Drawings
The invention is further described below with reference to the accompanying drawings.
FIG. 1 is a DC bias performance diagram of the Fe-Ni soft magnetic powder core under the condition of 0 Oe-200 Oe in example 1 of the present invention.
Detailed Description
The present invention will be further described with reference to the following examples. The described embodiments and their results are only intended to illustrate the invention and should not be taken as limiting the invention described in detail in the claims.
Example 1:
selecting 1000.0g of iron-nickel magnetic powder with the particle size of-200 meshes, adding 10.0g of water-based organic silicon resin, 30.0g of 1000-mesh attapulgite powder and 200.0g of water, and stirring at normal temperature for 10 minutes to form uniform mixed slurry; then, heating the mixed slurry to 120 ℃, preserving heat and stirring for 20 minutes, and after the heat preservation is finished, sieving the dried iron-nickel insulating powder by using a 100-mesh sieve; adding 5.0g of phenolic resin binder and 6.0g of zinc stearate release agent into the sieved powder, and uniformly mixing to obtain magnetic powder to be molded; pressing the uniformly mixed magnetic powder to be molded into a powder core blank by adopting the pressing pressure of about 2200MPa, wherein the powder core blank is an annular powder core with the outer diameter of 27.00mm, the inner diameter of 14.80mm and the height of 11.18 mm; adopting nitrogen as protective gas, and keeping the pressed powder core blank at 780 ℃ for 50 minutes to obtain a semi-finished product of the magnetic powder core; and finally, spraying a layer of insulating and high-temperature-resistant epoxy resin coating on the surface of the semi-finished magnetic powder, and drying to obtain a finished metal soft magnetic powder core.
Comparative example 1:
selecting 1000.0g of iron-nickel magnetic powder with the particle size of-200 meshes, adding 5.0g of water-based organic silicon resin, 10.0g of 1000-mesh attapulgite powder and 200.0g of water, and stirring at normal temperature for 10 minutes to form uniform mixed slurry; heating the mixed slurry to 120 ℃, preserving heat and stirring for 20 minutes, and sieving the dried iron-nickel insulating powder by using a 100-mesh sieve after the heat preservation is finished; adding 5.0g of phenolic resin binder and 6.0g of zinc stearate release agent into the sieved powder, and uniformly mixing to obtain magnetic powder to be molded; pressing the uniformly mixed magnetic powder to be molded into a powder core blank by adopting a pressing pressure of about 1600MPa, wherein the powder core blank is an annular powder core with the outer diameter of 27.00mm, the inner diameter of 14.80mm and the height of 11.18 mm; adopting nitrogen as protective gas, and keeping the pressed powder core blank at 650 ℃ for 50 minutes to obtain a semi-finished product of the magnetic powder core; and finally, spraying a layer of insulating and high-temperature-resistant epoxy resin coating on the surface of the semi-finished magnetic powder, and drying to obtain a finished metal soft magnetic powder core.
Winding 25 turns of inductance coils on the iron-nickel metal soft magnetic powder core by adopting enameled wires with the wire diameter phi of 1.00mm and the wire length of 0.9m, and measuring to obtain the powder core magnetoelectric property.
Figure BDA0003584759020000041
As can be seen from the test results, the direct current bias performance of the 60 mu iron-nickel powder core prepared by the method of the invention under the condition of 100Oe is up to 87.27 percent, and the volume loss under 50kHz and 100mT is 125.5mW/cm3And the soft magnetic performance is excellent.
In comparative example 1, the inductance of the iron-nickel powder core prepared by reducing the water-based silicone resin and the attapulgite powder to 1600MPa and the heat treatment temperature to 650 ℃ is similar to that of example 1 and belongs to the iron-nickel powder core of the 60 mu grade, but the Q value of comparative example 1 is obviously reduced, the loss test value is also obviously increased, and the direct current bias performance of the comparative example is lower than that of example 1.
Example 2:
selecting 1000.0g of iron-nickel magnetic powder with the particle size of-200 meshes, adding 12.0g of water-based organic silicon resin, 25.0g of 1000-mesh attapulgite powder and 150.0g of water, and stirring at normal temperature for 30 minutes to form uniform mixed slurry; then, heating the mixed slurry to 100 ℃, preserving heat and stirring for 40 minutes, and after the heat preservation is finished, sieving the dried iron-nickel insulating powder by using a 100-mesh sieve; adding 2.0g of siloxane resin binder and 4.0g of talcum powder release agent into the sieved powder, and uniformly mixing to obtain magnetic powder to be molded; pressing the uniformly mixed magnetic powder to be molded into a powder core blank by adopting the pressing pressure of about 2000MPa, wherein the powder core blank is an annular powder core with the outer diameter of 27.00mm, the inner diameter of 14.80mm and the height of 11.18 mm; argon is used as protective gas, and the pressed powder core blank is subjected to heat preservation at 730 ℃ for 100 minutes to obtain a semi-finished product of the magnetic powder core; and finally, spraying a layer of insulating and high-temperature-resistant epoxy resin coating on the surface of the semi-finished magnetic powder, and drying to obtain a finished metal soft magnetic powder core.
Comparative example 2:
selecting 1000.0g of iron-nickel magnetic powder with the particle size of-200 meshes, adding 12.0g of water-based organic silicon resin, 25.0g of 1000-mesh attapulgite powder and 150.0g of water, and stirring at normal temperature for 30 minutes to form uniform mixed slurry; heating the mixed slurry to 100 ℃, preserving heat and stirring for 40 minutes, and sieving the dried iron-nickel insulating powder by using a 100-mesh sieve after the heat preservation is finished; adding 2.0g of phenolic resin binder and 4.0g of zinc stearate release agent into the sieved powder, and uniformly mixing to obtain magnetic powder to be molded; pressing the uniformly mixed magnetic powder to be molded into a powder core blank by adopting a pressing pressure of about 2500MPa, wherein the powder core blank is an annular powder core with the outer diameter of 27.00mm, the inner diameter of 14.80mm and the height of 11.18 mm; adopting nitrogen as protective gas, and keeping the pressed powder core blank at 800 ℃ for 100 minutes to obtain a semi-finished product of the magnetic powder core; and finally, spraying a layer of insulating and high-temperature-resistant epoxy resin coating on the surface of the semi-finished magnetic powder, and drying to obtain a finished metal soft magnetic powder core.
Winding 25 turns of inductance coils on the iron-nickel metal soft magnetic powder core by adopting enameled wires with the wire diameter phi of 1.00mm and the wire length of 0.9m, and measuring to obtain the powder core magnetoelectric property.
Figure BDA0003584759020000051
As can be seen from the test results, the direct current bias performance of the 60 mu iron-nickel powder core prepared by the method of the invention under the condition of 100Oe is up to 88.02 percent, and the volume loss under 50kHz and 100mT is 112.6mW/cm3And the soft magnetic performance is excellent.
In comparative example 2, the inductance of the prepared iron-nickel powder core is slightly higher than that of example 2 and is of the same grade as that of the iron-nickel powder core of 60 mu after the forming pressure is increased to 2500MPa and the heat treatment temperature is increased to 800 ℃, but the Q value of comparative example 2 is obviously reduced, the loss test value is also obviously increased, and the direct current bias performance of the comparative example is also lower than that of example 2.
Through comparative example test data, the parameters of the technical scheme of the invention are optimized, and the obvious deterioration of the performance of the iron-nickel powder core can be caused by changing the parameters of the technical scheme.
Example 3:
selecting 1000.0g of iron-nickel magnetic powder with the particle size of-200 meshes, adding 15.0g of water-based organic silicon resin, 15.0g of 1000-mesh attapulgite powder and 100.0g of water, and stirring at normal temperature for 50 minutes to form uniform mixed slurry; heating the mixed slurry to 80 ℃, preserving heat and stirring for 60 minutes, and sieving the dried iron-nickel insulating powder by using a 100-mesh sieve after the heat preservation is finished; adding 1.0g of polyamide resin binder and 3.0g of mica powder release agent into the sieved powder, and uniformly mixing to obtain magnetic powder to be molded; pressing the uniformly mixed magnetic powder to be molded into a powder core blank by adopting a pressing pressure of about 1800MPa, wherein the powder core blank is an annular powder core with the outer diameter of 27.00mm, the inner diameter of 14.80mm and the height of 11.18 mm; adopting hydrogen as protective gas, and keeping the pressed powder core blank at 680 ℃ for 150 minutes to obtain a semi-finished product of the magnetic powder core; and finally, spraying a layer of insulating and high-temperature-resistant epoxy resin coating on the surface of the semi-finished magnetic powder, and drying to obtain a finished metal soft magnetic powder core.
Comparative example 3:
selecting 1000.0g of iron-nickel magnetic powder with the particle size of-200 meshes, adding 24.0g of phosphoric acid and 100.0g of water, and stirring at normal temperature for 50 minutes to form uniform mixed slurry; heating the mixed slurry to 80 ℃, preserving heat and stirring for 60 minutes, and sieving the dried iron-nickel insulating powder by using a 100-mesh sieve after the heat preservation is finished; adding 1.0g of polyamide resin binder and 3.0g of mica powder release agent into the sieved powder, and uniformly mixing to obtain magnetic powder to be molded; pressing the uniformly mixed magnetic powder to be molded into a powder core blank by adopting a pressing pressure of about 1800MPa, wherein the powder core blank is an annular powder core with the outer diameter of 27.00mm, the inner diameter of 14.80mm and the height of 11.18 mm; adopting hydrogen as protective gas, and keeping the pressed powder core blank at 680 ℃ for 150 minutes to obtain a semi-finished product of the magnetic powder core; and finally, spraying a layer of insulating and high-temperature-resistant epoxy resin coating on the surface of the semi-finished magnetic powder, and drying to obtain a finished metal soft magnetic powder core.
Winding 25 turns of inductance coils on the iron-nickel metal soft magnetic powder core by adopting enameled wires with the wire diameter phi of 1.00mm and the wire length of 0.9m, and measuring to obtain the powder core magnetoelectric property.
Figure BDA0003584759020000061
As can be seen from the test results, the direct current bias performance of the 60 mu iron-nickel powder core prepared by the method of the invention under the condition of 100Oe is up to 87.52 percent, and the volume loss under 50kHz and 100mT is 122.5mW/cm3And the soft magnetic performance is excellent.
In comparative example 3, the surface of the iron-nickel powder was passivated by the conventional phosphoric acid passivation method, and a 60 μ iron-nickel powder core was prepared. In comparison with example 3, the Q value and loss performance in comparative example 3 were significantly deteriorated, and the dc bias performance was also attenuated to some extent.
Therefore, the technical scheme of the invention can greatly improve the performance of the iron-nickel powder core, and particularly can greatly optimize the Q value and the loss performance of the iron-nickel powder core.

Claims (10)

1. A preparation method of a low-loss iron-nickel soft magnetic powder core for a chip inverter is characterized by comprising the following steps:
step 1: adding the water-based organic silicon resin, the attapulgite powder and water into the iron-nickel magnetic powder, and stirring and mixing uniformly at normal temperature to obtain mixed slurry;
step 2: heating the obtained mixed slurry, preserving heat, stirring, and sieving the dried powder after heat preservation to obtain insulating coated powder;
and step 3: adding a binder and a release agent into the insulating coated powder obtained in the step 2, and uniformly mixing to obtain magnetic powder to be molded;
and 4, step 4: pressing the magnetic powder to be molded prepared in the step 3 into a powder core blank by using a press;
and 5: under the protection of inert or reducing gas, preserving the heat of the powder core blank pressed and formed in the step 4 at 680-780 ℃ to obtain a semi-finished product of the magnetic powder core;
step 6: and (5) spraying an insulating and high-temperature-resistant epoxy resin coating on the surface of the semi-finished magnetic powder core obtained in the step (5) to obtain a finished metal soft magnetic powder core.
2. The method of claim 1, wherein:
in the step 1, the particle size of the raw iron-nickel magnetic powder is less than or equal to 200 meshes, and the iron-nickel magnetic powder comprises the following components in percentage by mass: ni49.0-51.0%, and the balance Fe; the particle size of the attapulgite powder is less than or equal to 1000 meshes.
3. The method of claim 1, wherein:
in the step 1, the adding mass of the water-based organic silicon resin is 1.0-1.5 percent of the mass of the iron-nickel magnetic powder; the adding mass of the attapulgite powder is 1.5 to 3.0 percent of the mass of the iron-nickel magnetic powder; the adding mass of the water is 10.0-20.0% of the mass of the iron-nickel magnetic powder.
4. The method of claim 1, wherein:
in the step 2, the temperature of heating, heat preservation and stirring is controlled to be 80-120 ℃, and the heat preservation time is 20-60 minutes.
5. The method of claim 1, wherein:
in the step 3, the adding mass of the binder is 0.1-0.5% of the mass of the iron-nickel magnetic powder; the addition mass of the release agent is 0.3-0.6% of the mass of the iron-nickel magnetic powder.
6. The method of claim 1, wherein:
in the step 3, the binder is selected from one or more of siloxane resin, phenolic resin and polyamide resin; the release agent is selected from one or more of zinc stearate, calcium stearate, talcum powder and mica powder.
7. The method of claim 1, wherein:
in the step 4, the pressing pressure is 1800 MPa-2200 MPa.
8. The method of claim 1, wherein:
in the step 5, the heat preservation time is 50 minutes to 150 minutes.
9. The method of claim 1, wherein:
the effective magnetic permeability of the prepared low-loss iron-nickel soft magnetic powder core is 60.
10. The method of claim 9, wherein:
the direct current bias performance of the iron-nickel soft magnetic powder core under the condition of 100Oe is higher than 87%, and the volume loss Pcv under the conditions of 50kHz and 100mT is lower than 130mW/cm3。
CN202210363242.1A 2022-04-07 2022-04-07 Preparation method of low-loss iron-nickel soft magnetic powder core for chip inverter Pending CN114664554A (en)

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