CN112251648B - High-permeability low-loss FeNiMo magnetic powder core and preparation method thereof - Google Patents
High-permeability low-loss FeNiMo magnetic powder core and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
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- C22C19/00—Alloys based on nickel or cobalt
- C22C19/03—Alloys based on nickel or cobalt based on nickel
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- 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
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Abstract
The invention discloses a high-permeability low-loss FeNiMo magnetic powder core and a preparation method thereof, relates to the technical field of metal soft magnetic powder cores, and solves the technical problem of low performance of the metal soft magnetic powder cores used in the present military industry and high-end test equipment, wherein the high-permeability low-loss FeNiMo magnetic powder core is prepared from the following components in percentage by mass of 10: 0.1-0.3: 0.5-0.8 of FeNiMo alloy, inorganic matter and adhesive, wherein the FeNiMo alloy comprises the following components in percentage by mass: the magnetic powder core of the FeNiMo magnetic powder has the advantages of high magnetic permeability, low loss, high saturation magnetic induction intensity, high magnetic permeability, low loss, high energy conversion efficiency and strong extreme environment tolerance capability, can be applied to military products such as load coils, filters, transformers and the like or high-end precise instruments and equipment, and can meet the requirements of large military electronic systems and high-end test instrument systems on metal soft magnetic elements.
Description
Technical Field
The invention relates to the technical field of metal soft magnetic powder cores, in particular to a high-permeability low-loss FeNiMo magnetic powder core and a preparation method thereof.
Background
The metal soft magnetic powder core is a soft magnetic material, is made of metal or alloy soft magnetic material into powder, and is processed to produce the magnetic core, which mainly comprises an iron powder core, an iron-silicon-aluminum powder core, a high-flux powder core and a molybdenum permalloy magnetic powder core, wherein the metal soft magnetic powder core not only retains the excellent characteristics of the metal soft magnetic and the ferrite soft magnetic, but also overcomes the defects of the metal soft magnetic and the ferrite soft magnetic. At present, a metal soft magnetic powder core is taken as a fourth-generation magnetic functional material, is widely applied to military industry and civil products, particularly a FeNiMo magnetic powder core, is taken as a metal soft magnetic material with excellent electromagnetic performance and strong extreme environment tolerance, is applied to military fields such as aerospace, aviation, radars, ships, satellites and the like, and belongs to key core components.
The progress of science and technology and society puts forward higher requirements on the development of various scientific and technological fields, the high precision, high sensitivity, large capacity, miniaturization and low consumption of the modern society are the general requirements and development directions of various electronic products, which are also the requirements and development directions of metal soft magnetic materials widely applied to various electronic products,
at present, the highest magnetic permeability of the FeNiMo magnetic powder core prepared by the traditional process reaches 300, the FeNiMo magnetic powder core cannot be used under the condition of higher magnetic permeability, and meanwhile, the FeNiMo magnetic powder core has the defects of larger loss, poor high-frequency characteristics, poor magnetic property stability and the like, and the application field is still limited to a certain extent.
Therefore, in order to solve the above problems, it is necessary to provide a high-permeability low-loss FeNiMo magnetic powder core and a method for preparing the same.
Disclosure of Invention
The invention aims to: in order to solve the problem that the performance of a metal soft magnetic powder core used in the existing military industry and high-end test equipment is low, the invention provides the FeNiMo magnetic powder core with high magnetic conductivity and low loss and the preparation method thereof.
The invention specifically adopts the following technical scheme for realizing the purpose:
a high-permeability low-loss FeNiMo magnetic powder core is prepared from the following components in percentage by mass: 0.1-0.3: 0.5-0.8 of FeNiMo alloy, inorganic matter and adhesive, wherein the FeNiMo alloy comprises the following components in percentage by mass: 16.5 to 17.5 percent of Fe16, 80.5 to 81.5 percent of Nib, and the balance of Mo.
Further, the FeNiMo magnetic powder core with high magnetic conductivity and low loss comprises the following components in percentage by mass: 0.2: 0.6 FeNiMo alloy, inorganic matter and adhesive.
Further, the FeNiMo alloy comprises the following components in percentage by mass: 16.5 to 17.5 percent of Fe16, 80.5 to 81.5 percent of Ni0 and 2.0 percent of Mos.
Further, the inorganic substance is one or a combination of more of silicon oxide, aluminum oxide, magnesium oxide and zinc oxide.
Further, the adhesive is one or a combination of more of epoxy resin, silicone resin, PVA and PVB.
The invention also aims to provide a preparation method of the high-permeability low-loss FeNiMo magnetic powder core, which comprises the following steps:
step one, atomizing to prepare powder: putting the FeNiMo alloy into a medium-frequency smelting furnace, vacuumizing, introducing inert gas for smelting, and atomizing to prepare powder after the FeNiMo alloy is smelted into uniform molten steel to obtain spheroid powder particles with the particle size of 20-30 microns;
step two, coating the insulating layer by a sol-gel method: coating the inorganic substance on the surface of the spheroid powder particles obtained in the step one by using a sol-gel method to form a uniform and compact inorganic insulating layer with the thickness of 10 nm-20 nm to obtain insulating particles;
step three, preparing a blank magnetic core: dissolving the adhesive in a solvent, adding the dissolved adhesive into the insulating particles obtained in the second step, stirring for 10-20 min, heating to 40-45 ℃ at a speed of 2-3 ℃/min, keeping the temperature at 40-45 ℃ for 60-90 min, and pressing under the pressure of 3.5-6.5 Mpa to obtain a blank magnetic core;
step four, preparing the high-permeability low-loss FeNiMo magnetic powder core: and putting the blank magnetic core obtained in the third step into a tube furnace, heating to 780-810 ℃ at the speed of 1.0-1.5 ℃/min under the protection of inert gas, preserving the heat at 780-810 ℃ for 60-120 min, cooling to room temperature at the speed of 0.8-1.0 ℃/min, spraying epoxy resin paint, and drying at 78-82 ℃ for 120-130 min to obtain the high-permeability and low-loss FeNiMo magnetic powder core.
Further, in the step one, the smelting specifically comprises: the method comprises the steps of heating to 850-950 ℃ at the speed of 5.0-8.0 ℃/min, carrying out heat preservation smelting at the temperature of 850-950 ℃ for 30-40 min, heating to 1460-1580 ℃ at the speed of 3.0-5.0 ℃/min, and carrying out heat preservation smelting at the temperature of 1460-1580 ℃ for 50-60 min.
Further, in the first step, the atomized powder can be atomized by gas atomization, water atomization or gas-water combined atomization.
Further, in the fourth step, when the epoxy resin paint is sprayed, the thickness of the paint layer of the outer diameter of the magnetic powder core is 0.16 mm-0.18 mm, the thickness of the paint layer of the inner diameter is 0.034 mm-0.036 mm, and the thickness of the paint layer of the end face is 0.27 mm-0.29 mm.
The invention has the following beneficial effects:
1. the FeNiMo magnetic powder core with high magnetic conductivity and low loss has high saturation magnetic induction intensity, high magnetic conductivity,
The magnetic material has low loss, high energy conversion efficiency and strong extreme environment tolerance capability, can be applied to military products such as load coils, filters, transformers and the like or high-end precise instrument equipment, and can meet the requirements of large military electronic systems and high-end test instrument systems on metal soft magnetic elements.
Drawings
FIG. 1 is a schematic view of the high permeability and low loss FeNiMo magnetic powder core package of the present invention;
FIG. 2 is a schematic diagram of a FeNiMo magnetic powder core winding with high magnetic permeability and low loss according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below,
example 1
High-permeability low-loss FeNiMo magnetic powder core
The mass ratio of 10: 0.1: 0.5 of FeNiMo alloy, inorganic matter and adhesive, FeNiMo
The alloy comprises the following components in percentage by mass: fe16.5%, Ni81.5% and Mo2.0%; wherein the raw material of the inorganic insulating layer is silicon oxide; the adhesive is silicone resin.
The preparation steps are as follows:
step one, atomizing to prepare powder: putting the FeNiMo alloy into a medium-frequency smelting furnace, vacuumizing, introducing inert gas, heating to 850 ℃ at the speed of 5.0 ℃/min, carrying out heat preservation smelting at the temperature of 850 ℃ for 40min, heating to 1460 ℃ at the speed of 3.0 ℃/min, carrying out heat preservation smelting at the temperature of 1460 ℃ for 60min, and carrying out atomization powder preparation after the FeNiMo alloy is smelted into uniform molten steel to obtain spheroid powder particles with the particle size of 20 microns;
in the above, the atomized powder can be prepared by gas atomization;
step two, coating the insulating layer by a sol-gel method: coating a layer of uniform and compact inorganic insulating layer with the thickness of 10nm on the surface of the spheroid powder particles obtained in the step one by using a sol-gel method to obtain insulating particles;
step three, preparing a blank magnetic core: dissolving silicone resin in acetone, adding into the insulating particles obtained in the second step, stirring for 10min, heating to 40 ℃ at a speed of 2 ℃/min, keeping at 40 ℃ for 90min, and pressing under a pressure of 3.5Mpa to obtain a blank magnetic core;
step four, preparing the high-permeability low-loss FeNiMo magnetic powder core: and putting the blank magnetic core obtained in the third step into a tube furnace, heating to 780 ℃ at the speed of 1.0 ℃/min under the protection of inert gas, preserving the heat for 120min at the temperature of 780 ℃, cooling to room temperature at the speed of 0.8 ℃/min, spraying epoxy resin paint, and drying for 130min at the temperature of 78 ℃ to obtain the high-permeability low-loss FeNiMo magnetic powder core.
In the above, when spraying the epoxy resin paint, the thickness of the paint layer of the outer diameter of the magnetic powder core is 0.16mm, the thickness of the paint layer of the inner diameter is 0.034mm, and the thickness of the paint layer of the end face is 0.27 mm.
The FeNiMo magnetic powder core with high magnetic conductivity and low loss prepared by the embodiment meets the standard regulation of SJ20829-2002 metal soft magnetic powder core general specification through detection, and has the saturation magnetic induction intensity of 8100 Gs; permeability 310, loss 0.3%.
Example 2
High-permeability low-loss FeNiMo magnetic powder core
The mass ratio of 10: 0.3: 0.8 of FeNiMo alloy, inorganic matter and adhesive, FeNiMo
The alloy comprises the following components in percentage by mass: fe17.5%, Ni80.5% and Mo2.0%; wherein the inorganic substance is alumina; the adhesive is PVB.
The preparation steps are as follows:
step one, atomizing to prepare powder: putting the FeNiMo alloy into a medium-frequency smelting furnace, vacuumizing, introducing inert gas, heating to 950 ℃ at the speed of 8.0 ℃/min, carrying out heat preservation smelting at 950 ℃ for 30min, heating to 1580 ℃ at the speed of 5.0 ℃/min, carrying out heat preservation smelting at 1580 ℃ for 50min, and carrying out atomization powder preparation after the FeNiMo alloy is smelted into uniform molten steel to obtain spheroidal powder particles with the particle size of 30 microns;
in the above, the atomized powder can be atomized by water;
step two, coating the insulating layer by a sol-gel method: coating a layer of uniform and compact inorganic insulating layer with the thickness of 20nm on the surface of the spheroid powder particles obtained in the step one by using a sol-gel method to obtain insulating particles;
step three, preparing a blank magnetic core: dissolving PVB in ethanol, adding the PVB into the insulating particles obtained in the second step, stirring for 20min, heating to 45 ℃ at the speed of 3 ℃/min, keeping the temperature at 45 ℃ for 60min, and pressing under the pressure of 6.5Mpa to obtain a blank magnetic core;
step four, preparing the high-permeability low-loss FeNiMo magnetic powder core: and putting the blank magnetic core obtained in the third step into a tube furnace, heating to 810 ℃ at the speed of 1.5 ℃/min under the protection of inert gas, preserving the heat for 60min at the temperature of 810 ℃, cooling to room temperature at the speed of 1.0 ℃/min, spraying epoxy resin paint, and drying for 120min at the temperature of 82 ℃ to obtain the high-permeability low-loss FeNiMo magnetic powder core.
In the above, when spraying the epoxy resin paint, the thickness of the paint layer of the outer diameter of the magnetic powder core is 0.18mm, the thickness of the paint layer of the inner diameter is 0.036mm, and the thickness of the paint layer of the end face is 0.29 mm.
The FeNiMo magnetic powder core with high magnetic conductivity and low loss prepared by the embodiment meets the standard regulation of SJ20829-2002 metal soft magnetic powder core general specification through detection, and has the saturation magnetic induction intensity of 8150 Gs; permeability 315, loss 0.2%.
Example 3
High-permeability low-loss FeNiMo magnetic powder core
The mass ratio of 10: 0.2: 0.6 of FeNiMo alloy, inorganic matters and adhesives; the FeNiMo alloy comprises the following components in percentage by mass: 16.5 to 17.5 percent of Fe16, 80.5 to 81.5 percent of Ni0 and 2.0 percent of Mos; wherein the inorganic substance is silicon oxide, aluminum oxide and zinc oxide according to the mass ratio of 1: 1: a combination of 0.2; the adhesive is prepared from PVA and epoxy resin according to the mass ratio of 1: 1 in combination.
The alloy is prepared from FeNiMo alloy, wherein the FeNiMo alloy comprises the following components in percentage by mass: fe17.0%, Ni81.0% and Mo2.0%.
The preparation steps are as follows:
step one, atomizing to prepare powder: putting the FeNiMo alloy into a medium-frequency smelting furnace, vacuumizing, introducing inert gas, heating to 900 ℃ at the speed of 7.0 ℃/min, carrying out heat preservation smelting at 900 ℃ for 35min, heating to 1520 ℃ at the speed of 4.0 ℃/min, carrying out heat preservation smelting at 1520 ℃ for 55min, and carrying out atomization powder preparation after the FeNiMo alloy is smelted into uniform molten steel to obtain spheroid powder particles with the particle size of 25 microns;
in the above, the atomized powder can be atomized by gas, water or gas-water combined atomization;
step two, coating the insulating layer by a sol-gel method: coating a layer of uniform and compact inorganic insulating layer with the thickness of 15nm on the surface of the spheroid powder particles obtained in the step one by using a sol-gel method to obtain insulating particles;
step three, preparing a blank magnetic core: dissolving PVA and epoxy resin in water, adding the dissolved PVA and epoxy resin into the insulating particles obtained in the second step, stirring the mixture for 15min, heating the mixture to 43 ℃ at the speed of 2.5 ℃/min, keeping the temperature at 43 ℃ for 75min, and pressing the mixture under the pressure of 5.0Mpa to obtain a blank magnetic core;
step four, preparing the high-permeability low-loss FeNiMo magnetic powder core: and putting the blank magnetic core obtained in the third step into a tube furnace, heating to 800 ℃ at the speed of 1.2 ℃/min under the protection of inert gas, preserving the heat for 9min at the temperature of 800 ℃, cooling to room temperature at the speed of 0.9 ℃/min, spraying epoxy resin paint, and drying for 120min at the temperature of 80 ℃ to obtain the high-permeability low-loss FeNiMo magnetic powder core.
In the above, when spraying the epoxy resin paint, the thickness of the paint layer of the outer diameter of the magnetic powder core is 0.17mm, the thickness of the paint layer of the inner diameter is 0.035mm, and the thickness of the paint layer of the end face is 0.28 mm.
The FeNiMo magnetic powder core with high magnetic conductivity and low loss prepared by the embodiment meets the standard regulation of SJ20829-2002 metal soft magnetic powder core general specification through detection, and has the saturation magnetic induction intensity of 8200 Gs; magnetic permeability 320, loss 0.1%.
Claims (8)
1. The high-permeability low-loss FeNiMo magnetic powder core is characterized in that the high-permeability low-loss FeNiMo magnetic powder core is prepared by mixing the following components in percentage by mass: 0.1-0.3: 0.5-0.8 of FeNiMo alloy, inorganic matter and adhesive, wherein the FeNiMo alloy comprises the following components in percentage by mass: 16.5-17.5% of Fe16, 80.5-81.5% of Nib, and the balance of Mo; the preparation method of the FeNiMo magnetic powder core with high magnetic conductivity and low loss comprises the following steps:
step one, atomizing to prepare powder: putting the FeNiMo alloy into a medium-frequency smelting furnace, vacuumizing, introducing inert gas for smelting, and atomizing to prepare powder after the FeNiMo alloy is smelted into uniform molten steel to obtain spheroid powder particles with the particle size of 20-30 microns;
step two, coating the insulating layer by a sol-gel method: coating the inorganic substance on the surface of the spheroid powder particles obtained in the step one by using a sol-gel method to form a uniform and compact inorganic insulating layer with the thickness of 10 nm-20 nm to obtain insulating particles;
step three, preparing a blank magnetic core: dissolving the adhesive in a solvent, adding the dissolved adhesive into the insulating particles obtained in the second step, stirring for 10-20 min, heating to 40-45 ℃ at a speed of 2-3 ℃/min, keeping the temperature at 40-45 ℃ for 60-90 min, and pressing under the pressure of 3.5-6.5 Mpa to obtain a blank magnetic core;
step four, preparing the high-permeability low-loss FeNiMo magnetic powder core: and putting the blank magnetic core obtained in the third step into a tube furnace, heating to 780-810 ℃ at the speed of 1.0-1.5 ℃/min under the protection of inert gas, preserving the heat at 780-810 ℃ for 60-120 min, cooling to room temperature at the speed of 0.8-1.0 ℃/min, spraying epoxy resin paint, and drying at 78-82 ℃ for 120-130 min to obtain the high-permeability and low-loss FeNiMo magnetic powder core.
2. The high permeability low loss FeNiMo magnetic powder core according to claim 1, wherein said high permeability low loss FeNiMo magnetic powder core is formed by mixing, by mass, 10: 0.2: 0.6 FeNiMo alloy, inorganic matter and adhesive.
3. The FeNiMo magnetic powder core with high magnetic permeability and low loss according to claim 1, wherein the FeNiMo alloy comprises the following components in percentage by mass: 16.5 to 17.5 percent of Fe16, 80.5 to 81.5 percent of Ni0 and 2.0 percent of Mos.
4. The FeNiMo magnetic powder core with high magnetic permeability and low loss according to claim 1, wherein the inorganic substance is one or more of silicon oxide, aluminum oxide, magnesium oxide and zinc oxide.
5. The FeNiMo magnetic powder core with high magnetic permeability and low loss according to claim 1, wherein the adhesive is one or more of epoxy resin, silicone resin, PVA and PVB.
6. The FeNiMo magnetic powder core with high magnetic permeability and low loss according to claim 1, wherein in the first step, the smelting is specifically as follows: the method comprises the steps of heating to 850-950 ℃ at the speed of 5.0-8.0 ℃/min, carrying out heat preservation smelting at the temperature of 850-950 ℃ for 30-40 min, heating to 1460-1580 ℃ at the speed of 3.0-5.0 ℃/min, and carrying out heat preservation smelting at the temperature of 1460-1580 ℃ for 50-60 min.
7. The FeNiMo magnetic powder core with high magnetic permeability and low loss according to claim 1, wherein in the first step, the atomized powder is prepared by gas atomization, water atomization or gas-water combined atomization.
8. The FeNiMo magnetic powder core with high magnetic permeability and low loss according to claim 1, wherein in the fourth step, when the epoxy resin paint is sprayed, the thickness of the paint layer on the outer diameter of the magnetic powder core is 0.16mm to 0.18mm, the thickness of the paint layer on the inner diameter is 0.034mm to 0.036mm, and the thickness of the paint layer on the end surface is 0.27mm to 0.29 mm.
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| CN115497739B (en) * | 2022-10-25 | 2023-07-04 | 广州市美登电子有限公司 | Alloy magnetic powder core material, preparation method and application thereof |
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