CN114360833A - Composite powder material for manufacturing metal soft magnetic powder core and preparation method thereof - Google Patents
Composite powder material for manufacturing metal soft magnetic powder core and preparation method thereof Download PDFInfo
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Abstract
The invention relates to a composite powder material for manufacturing a metal soft magnetic powder core and a preparation method thereof, wherein the composite powder material comprises the following chemical components in percentage by weight of less than or equal to 0.020% of C, Si: 5.8% -7.0%, Mn: 0.10 to 0.20 percent of iron, less than or equal to 0.010 percent of P, less than or equal to 0.010 percent of S, less than or equal to 0.003 percent of N, and the balance of iron and inevitable impurities. The composite powder material prepared by the invention is composed of composite powder with a surface coating layer containing silicon dioxide, no residue is left in the preparation process, the composite material has high magnetic conductivity and low loss, the frequency stability is good, and the magnetic loss is small under high frequency; and the process is simple, safe and reliable.
Description
Technical Field
The invention relates to the technical field of composite powder preparation, in particular to a composite powder material for manufacturing a metal soft magnetic powder core and a preparation method thereof.
Background
The trend of power electronic devices toward high frequency, energy saving, high efficiency and miniaturization is an important reason for the appearance of metal soft magnetic powder cores. In order to be suitable for high-power application occasions, the matched soft magnetic iron core is required to have good anti-saturation performance. Obviously, conventional soft magnetic materials of high permeability cannot meet this requirement. The usual solution is to introduce an air gap in the magnetic circuit of soft magnetic material to achieve a large increase in the saturation magnetization field. However, the introduction of the air gap causes a series of problems such as electromagnetic interference, increased loss, increased temperature rise, increased noise, poor consistency and the like. Under such circumstances, the metallic soft magnetic powder core is gradually developed as a new composite soft magnetic material having a large number of distributed air gaps. The metal soft magnetic powder core is a composite soft magnetic material formed by mixing and pressing soft magnetic powder and an insulating medium through a powder metallurgy technology. The insulation coating method commonly used in the industry at present is a phosphoric acid passivation process. However, chemical corrosion of the magnetic powder causes increased loss, and the phosphate insulating layer is easily ablated at high temperature, thereby limiting the optimization of the powder core performance.
Chinese patent application No. 201310522883.8 discloses a method for coating metal magnetic powder with soft magnetic ferrite and a method for preparing soft magnetic composite material thereof, wherein the metal magnetic powder is mixed with a small amount of micron or submicron soft magnetic ferrite, and then the coating layer is formed by microwave high temperature heat treatment. The method for preparing the metal soft magnetic composite material by adopting the coating powder comprises the steps of coating the coating powder with an organic matter, adding a lubricant, then carrying out press forming, and finally carrying out annealing treatment to obtain the soft magnetic composite material. The technical scheme fully utilizes the characteristics of magnetism, high resistivity and high temperature resistance of the ferrite soft magnetic material, is a composite of two soft magnetic materials, has less nonmagnetic substances than other types of soft magnetic composite materials, and has higher heat treatment temperature, thereby having better comprehensive magnetic performance. However, the metal magnetic powder and the soft magnetic ferrite need to be mixed and then subjected to microwave heat treatment to form a coating layer, and a subsequent treatment process such as adding lubricating oil is needed, so that the process is complex and the cost is high.
The Chinese patent application with the application number of 201711205002.4 discloses a preparation method of a soft magnetic composite powder material, which aims to solve the defect problems of two major classes of soft magnetic materials, namely metal soft magnetic steel and soft magnetic ferrite, wherein the soft magnetic composite powder material comprises 84-89% of Mn, 5.5-6.5% of N, 2.0-4.0% of Nb, 1.5-2.0% of Ce and 2.0-3.0% of Mo; the preparation method comprises the steps of putting raw materials into an intermediate frequency furnace, carrying out nitrogen protection in the heating process, carrying out proper heat preservation at 1650-1750 ℃ after the raw materials are completely melted, carrying out molten steel atomization at the flow rate of 20-100 kg per minute, dehydrating atomized slurry, carrying out reduction treatment after vacuum drying, crushing reduced powder blocks, sieving by a 150-mesh sieve and packaging. The powder can be used for preparing metal soft magnetic products with excellent magnetic property. The preparation process of the composite powder material does not refer to a specific process method of powder compounding.
In view of the above problems in the prior art, there is an urgent need to develop a process for preparing composite powder material, which can avoid residue in the process of preparing composite powder, has simple process, is safe and reliable, fully ensures the performance of composite powder, and even improves the quality of the product.
Disclosure of Invention
The invention provides a composite powder material for manufacturing a metal soft magnetic powder core and a preparation method thereof, no residue is left in the prepared composite powder material, and the composite material has high magnetic conductivity, low loss, good frequency stability and small magnetic loss at high frequency; and the process is simple, safe and reliable.
In order to achieve the purpose, the invention adopts the following technical scheme:
the composite powder material for manufacturing the metal soft magnetic powder core comprises the following chemical components in percentage by weight, C is less than or equal to 0.020%, Si: 5.8% -7.0%, Mn: 0.10 to 0.20 percent of iron, less than or equal to 0.010 percent of P, less than or equal to 0.010 percent of S, less than or equal to 0.003 percent of N, and the balance of iron and inevitable impurities.
The magnetic conductivity of the composite powder material is 70-100H/m, and the saturation magnetic flux density is 1.7-1.9T.
The preparation method of the composite powder material for manufacturing the metal soft magnetic powder core comprises the following steps:
(1) electric furnace smelting:
putting an industrial pure iron raw material into a vacuum induction furnace for smelting, controlling the vacuum degree of the vacuum induction furnace to be 1-4 Pa, carrying out alloying treatment and molten steel component adjustment after the industrial pure iron raw material is completely molten, then raising the temperature of molten steel to 1581-1600 ℃, and finishing smelting;
(2) vacuum gas atomization:
carrying out vacuum atomization treatment on molten steel after tapping of a vacuum induction furnace by adopting a supersonic tightly-coupled gas atomization mode, wherein the inner diameter of an outlet of an atomization draft tube is 4-6 mm, the atomization gas is argon, the gas pressure at an atomization nozzle is 2-4 MPa, and the gas flow is 0.15-0.20 m3The atomization speed of the molten steel is 8-10 kg/min; the atomized metal powder is spherical powder;
(3) coating the surface of the powder material:
the surface temperature of the atomized spherical powder is 650-750 ℃ in the falling process of the atomization chamber, and at the moment, mixed gas of oxygen and carbon dioxide is blown in from the side wall of the atomization chamber; the gas pressure at the mixed gas nozzle is 1.2-1.8 MPa, and the gas flow is 0.008-0.015 m3(ii)/s, obtaining a composite powder having a surface coating layer, the surface coating layer containing silicon dioxide;
(4) collecting composite powder:
and cooling, collecting and screening the composite powder to obtain the composite powder material.
In the step (1), ferrosilicon and ferromanganese are added during alloying treatment, wherein the ferrosilicon comprises 74-80 wt% of Si, less than or equal to 0.10 wt% of C, less than or equal to 0.035 wt% of P, less than or equal to 0.02 wt% of S, and the balance of iron and inevitable impurities; the ferromanganese comprises the following chemical components in percentage by weight: 85-92% of Mn, less than or equal to 0.20% of C, less than or equal to 0.10% of P, less than or equal to 0.002% of S, and the balance of iron and inevitable impurities.
In the step (2), molten steel after tapping of the vacuum induction furnace is poured into a tundish for vacuum atomization treatment, and the tundish is preheated to 1150-1250 ℃.
In the step (2), the proportion of the particle size of less than or equal to 45 mu m in the spherical powder is more than 50%, and the proportion of the particle size of less than or equal to 100 mu m in the spherical powder is more than 90%.
In the step (3), the ratio of oxygen to carbon dioxide in the mixed gas is 1: 3-4.
Compared with the prior art, the invention has the beneficial effects that:
1) the composite of the metal magnetic powder is realized by using mixed gas in the atomization process, no residue is left, and the uniformity of the insulating coating layer is good
2) The composite powder material has high magnetic conductivity and low loss, good frequency stability and small magnetic loss at high frequency, and can ensure the performance of the metal soft magnetic powder core made of the composite powder material;
3) the preparation process is simple, environment-friendly, safe, reliable, low in cost, easy to operate and easy to realize industrial large-scale production;
4) the prepared composite powder material does not need post-treatment, and can be used for preparing a magnetic material finished product by 3D printing or directly pressing and forming.
Drawings
FIG. 1 is a schematic view showing the structure of an apparatus for use in the vacuum atomization process of the present invention.
FIG. 2 is a schematic diagram of the composition structure of the composite powder material of the present invention.
In the figure: 1. smelting chamber 2, vacuum induction furnace 3, tundish 4, molten steel 5, spray plate 6, atomized powder 7, composite powder 8, atomization chamber 9, powder collector 10, vacuumizing system 11, exhaust valve 12, mixed gas blowing-in hole 13, argon blowing-in hole 14, metal powder 15 and surface coating layer
Detailed Description
The following further describes embodiments of the present invention with reference to the accompanying drawings:
the composite powder material for manufacturing the metal soft magnetic powder core comprises the following chemical components in percentage by weight, C is less than or equal to 0.020%, Si: 5.8% -7.0%, Mn: 0.10 to 0.20 percent of iron, less than or equal to 0.010 percent of P, less than or equal to 0.010 percent of S, less than or equal to 0.003 percent of N, and the balance of iron and inevitable impurities.
The magnetic conductivity of the composite powder material is 70-100H/m, and the saturation magnetic flux density is 1.7-1.9T.
The preparation method of the composite powder material for manufacturing the metal soft magnetic powder core comprises the following steps:
(1) electric furnace smelting:
putting an industrial pure iron raw material into a vacuum induction furnace for smelting, controlling the vacuum degree of the vacuum induction furnace to be 1-4 Pa, carrying out alloying treatment and molten steel component adjustment after the industrial pure iron raw material is completely molten, then raising the temperature of molten steel to 1581-1600 ℃, and finishing smelting;
(2) vacuum gas atomization:
carrying out vacuum atomization treatment on molten steel after tapping of a vacuum induction furnace by adopting a supersonic tightly-coupled gas atomization mode, wherein the inner diameter of an outlet of an atomization draft tube is 4-6 mm, the atomization gas is argon, the gas pressure at an atomization nozzle is 2-4 MPa, and the gas flow is 0.15-0.20 m3The atomization speed of the molten steel is 8-10 kg/min; the atomized metal powder is spherical powder;
(3) coating the surface of the powder material:
the surface temperature of the atomized spherical powder is 650-750 ℃ in the falling process of the atomization chamber, and at the moment, mixed gas of oxygen and carbon dioxide is blown in from the side wall of the atomization chamber; the gas pressure at the mixed gas nozzle is 1.2-1.8 MPa, and the gas flow is 0.008-0.015 m3(ii)/s, obtaining a composite powder having a surface coating layer, the surface coating layer containing silicon dioxide;
(4) collecting composite powder:
and cooling, collecting and screening the composite powder to obtain the composite powder material.
In the step (1), ferrosilicon and ferromanganese are added during alloying treatment, wherein the ferrosilicon comprises 74-80 wt% of Si, less than or equal to 0.10 wt% of C, less than or equal to 0.035 wt% of P, less than or equal to 0.02 wt% of S, and the balance of iron and inevitable impurities; the ferromanganese comprises the following chemical components in percentage by weight: 85-92% of Mn, less than or equal to 0.20% of C, less than or equal to 0.10% of P, less than or equal to 0.002% of S, and the balance of iron and inevitable impurities.
In the step (2), molten steel after tapping of the vacuum induction furnace is poured into a tundish for vacuum atomization treatment, and the tundish is preheated to 1150-1250 ℃.
In the step (2), the proportion of the particle size of less than or equal to 45 mu m in the spherical powder is more than 50%, and the proportion of the particle size of less than or equal to 100 mu m in the spherical powder is more than 90%.
In the step (3), the ratio of oxygen to carbon dioxide in the mixed gas is 1: 3-4.
The reasons for setting the chemical components and the content ranges of the composite powder material of the present invention are as follows:
carbon: the carbon content is too high, which increases the hysteresis loss of the steel material, but if the carbon content in the steel is reduced to a very low level, the production cost is greatly increased, so the carbon content is controlled to be less than or equal to 0.020%.
Silicon: silicon in the steel can weaken the adverse effect of carbon, namely reduce hysteresis loss, can improve magnetic conductivity and resistivity, reduce coercive force and eddy current loss, and has the anti-aging effect of preventing magnetic deterioration caused by long-term use. Therefore, the invention controls the content of the silicon to be 5.8-7.0% to ensure that a certain amount of silicon is added.
Manganese: manganese can generate manganese sulfide with sulfur in steel to inhibit adverse effects of sulfur, but the steel is promoted to generate phase change when the manganese content is high, so that decarburization and desulfurization are not facilitated, and the magnetic induction is reduced, wherein the content of manganese is controlled to be 0.10-0.20%.
Sulfur and phosphorus: the sulfur and the phosphorus are harmful elements in the steel, the sulfur can cause the material to generate hot brittleness, the magnetic hysteresis loss is increased, the magnetic induction intensity is reduced, the content of the sulfur is strictly controlled, and the sulfur content is controlled to be below 0.010 percent; the phosphorus can cause the material to generate cold brittleness, and the content of the phosphorus is controlled to be below 0.010 percent.
Nitrogen: nitrogen produces nitride inclusions in the steel, which are non-magnetic or weakly magnetic substances, the presence of which causes distortion, dislocations, vacancies and internal stresses in the crystal lattice, making magnetization difficult. The content of the invention is controlled to be less than or equal to 0.003 percent.
The preparation method of the composite powder material comprises the processes of electric furnace smelting, vacuum gas atomization, powder material surface coating treatment, composite powder collection and the like.
The device for realizing the vacuum gas atomization of the molten steel is improved on the basis of the existing atomization device, as shown in figure 1, the existing atomization device consists of a smelting chamber 1 and an atomization chamber 8, a vacuum induction furnace 2 and a tundish 4 are arranged in the smelting chamber 1, and the atomization chamber is provided with a vacuum pumping system 10 and an exhaust valve 11; the vacuum gas atomization device is provided with a mixed gas blowing hole 12 on the side wall of an atomization chamber 8; molten steel smelted by the vacuum induction furnace 2 is injected into a preheated tundish 4, an atomization guide pipe is arranged at the bottom of the tundish 4, a spray plate 5 is arranged outside the atomization guide pipe, one end of the spray plate 5 facing the atomization guide pipe is provided with an atomization nozzle, and the outer end of the spray plate 5 is provided with an argon blowing hole 13 connected with an argon pipeline; the molten steel flows out of the atomization draft tube and enters an atomization chamber 8, is atomized into powder under the blowing action of argon, and forms spherical metal powder 14 under the action of internal force when falling; in the process that the spherical metal powder 14 continuously falls, the mixed gas consisting of oxygen and carbon dioxide is blown in from the mixed gas blowing hole 12 on the side wall of the atomizing chamber 8, so that a surface coating layer 15 containing silicon dioxide is formed on the surface of the metal powder 14, and the composite powder is obtained and falls into the powder collector 9 at the bottom of the atomizing chamber 8 for collection.
In the invention, mixed gas of oxygen and carbon dioxide is blown in during the vacuum atomization process, silicon in the metal powder 14 has very strong bonding capacity with oxygen, the blown carbon dioxide can promote silicon element to generate silicon dioxide, and simultaneously, the blown carbon dioxide can promote the temperature on the surface of the metal powder 14 to be rapidly reduced, thereby obtaining the composite powder of which the surface of the metal powder 14 is coated with a surface coating layer 15 (shown in figure 2) containing silicon dioxide.
The following examples are carried out on the premise of the technical scheme of the invention, and detailed embodiments and specific operation processes are given, but the scope of the invention is not limited to the following examples.
[ example 1 ]
In this example, the chemical components of the composite powder material were: c: 0.010%, Si: 5.8%, Mn: 0.10%, P: 0.008%, S: 0.009%, N: 0.0018 percent, and the balance of iron and inevitable impurities.
The preparation method of the composite powder material comprises the processes of electric furnace smelting, vacuum gas atomization, powder material surface coating treatment, composite powder collection and the like. The method comprises the following specific steps:
(1) electric furnace smelting: the industrial pure iron raw material with proper components is put into a vacuum induction furnace for smelting, the vacuum degree of the vacuum furnace is controlled to be 1Pa in order to ensure the cleanness of steel quality, ferrosilicon, ferromanganese and other alloys are added for alloying after the industrial pure iron raw material is completely melted, the total loading amount is 40kg, the temperature of molten steel is raised to 1581 ℃ after the adjustment of the components of the molten steel is finished, and the smelting is finished.
(2) Vacuum gas atomization: pouring molten steel into a tundish preheated to 1200 ℃ from the steel discharged from a vacuum induction furnace, and carrying out vacuum atomization treatment, wherein the atomization adopts a supersonic tightly-coupled gas atomization mode, the inner diameter of an outlet of an atomization draft tube is 4mm, the atomization gas is argon, the gas pressure at an atomization nozzle is 4MPa, and the gas flow is 0.20m3And/s, the molten steel atomization speed is 10kg/min, and spherical powder with the granularity of less than or equal to 45 mu m accounting for more than 50 percent and the granularity of less than or equal to 100 mu m accounting for more than 90 percent is obtained.
(3) Coating the surface of the powder material: in the falling process of the atomized spherical powder in the atomizing chamber, the surface temperature of the spherical powder reaches 650 ℃, at the moment, mixed gas of oxygen and carbon dioxide is blown in from the side wall of the atomizing chamber, and the proportion of the gas in the mixed gas is oxygen: carbon dioxide 1:3, gas pressure at the mixed gas nozzle: 1.8MPa, gas flow 0.008m3And/s, silicon in the spherical powder has very strong bonding capacity with oxygen, blown carbon dioxide can promote silicon element to generate silicon dioxide, and blown carbon dioxide can promote the temperature of the surface of the spherical powder to rapidly drop, so that the composite powder with the surface coating layer is obtained, and the surface coating layer contains silicon dioxide.
(4) Collecting composite powder: and cooling and collecting the composite powder, and screening according to the use requirement to obtain the composite powder material.
The composite powder material prepared by the embodiment does not need to be subjected to post-treatment, and the metal soft magnetic powder core is prepared by 3D printing.
The finished product of the metal soft magnetic powder core prepared from the composite powder material produced by the embodiment has the advantages of magnetic conductivity of 70, saturation magnetic flux density of 1.9T and good comprehensive performance.
[ example 2 ]
The composite powder material and the preparation method thereof are characterized in that:
in this example, the chemical components of the composite powder material were C: 0.015%, Si: 7.0%, Mn: 0.15%, P: 0.009%, S: 0.010%, N: 0.0029 percent, and the balance of iron and inevitable impurities.
The preparation method of the composite powder material comprises the processes of electric furnace smelting, vacuum gas atomization, powder material surface coating treatment, composite powder collection and the like. The method comprises the following specific steps:
(1) electric furnace smelting: the industrial pure iron raw material with proper components is put into a vacuum induction furnace for smelting, the vacuum degree of the vacuum furnace is controlled to be 4Pa in order to ensure the cleanness of steel quality, ferrosilicon, ferromanganese and other alloys are added for alloying after the industrial pure iron raw material is completely melted, the total loading amount is 40kg, the temperature of molten steel is raised to 1600 ℃ after the adjustment of the components of the molten steel is finished, and the smelting is finished.
(2) Molten steel atomization: pouring molten steel into a tundish preheated to 1200 ℃ from the steel discharged from a vacuum induction furnace, and carrying out vacuum atomization treatment, wherein the atomization adopts a supersonic tightly-coupled gas atomization mode, the inner diameter of an outlet of an atomization draft tube is 6mm, the atomization gas is argon, the gas pressure at an atomization nozzle is 3MPa, and the gas flow is 0.18m3And/s, the molten steel atomization speed is 9kg/min, and spherical powder with the granularity of less than or equal to 45 mu m accounting for more than 50 percent and the granularity of less than or equal to 100 mu m accounting for more than 90 percent is obtained.
(3) Coating the surface of the powder material: in the falling process of the atomized spherical powder in the atomizing chamber, the surface temperature of the spherical powder reaches 700 ℃, at the moment, mixed gas of oxygen and carbon dioxide is blown in from the side wall of the atomizing chamber, and the proportion of the gas in the mixed gas is oxygen: carbon dioxide is 1:4, the gas pressure at the mixed gas nozzle is 1.5MPa, and the gas flow rate is 0.012m3And s. The silicon in the spherical powder has very strong binding capacity with oxygen, and the blown carbon dioxide can also promote the silicon element to generate the dioxideAnd (3) silicon is melted, and the blown carbon dioxide can promote the temperature on the surface of the spherical powder to be rapidly reduced, so that the composite powder with the surface coating layer is obtained, and the surface coating layer contains silicon dioxide.
(4) Collecting composite powder: and cooling and collecting the composite powder, and screening according to the use requirement to obtain the composite powder material.
The composite powder material prepared by the embodiment does not need to be subjected to post-treatment, and the metal soft magnetic powder core is prepared by adopting 3D printing.
The metal soft magnetic powder core prepared from the composite powder material produced by the embodiment has the advantages of 100 magnetic conductivity, 1.8T saturation magnetic flux density and good comprehensive performance.
[ example 3 ]
In this example, the chemical components of the composite powder material were: c: 0.020%, Si: 6.4%, Mn: 0.20%, P: 0.006%, S: 0.007%, N: 0.0025 percent, and the balance of iron and inevitable impurities.
The preparation method of the composite powder material comprises the processes of electric furnace smelting, vacuum gas atomization, powder material surface coating treatment, composite powder collection and the like. The method comprises the following specific steps:
(1) electric furnace smelting: the industrial pure iron raw material with proper components is put into a vacuum induction furnace for smelting, the vacuum degree of the vacuum furnace is controlled to be 3Pa in order to ensure the cleanness of steel quality, ferrosilicon, ferromanganese and other alloys are added for alloying after the industrial pure iron raw material is completely melted, the total loading amount is 40kg, the temperature of molten steel is raised to 1590 ℃ after the adjustment of the components of the molten steel is finished, and the smelting is finished.
(2) Molten steel atomization: pouring molten steel into a tundish preheated to 1200 ℃ from the steel discharged from a vacuum induction furnace, and carrying out vacuum atomization treatment, wherein the atomization adopts a supersonic tightly-coupled gas atomization mode, the inner diameter of an outlet of an atomization draft tube is 5mm, the atomization gas is argon, the gas pressure at an atomization nozzle is 2MPa, and the gas flow is 0.15m3And/s, the molten steel atomization speed is 8kg/min, and spherical powder with the granularity of less than or equal to 45 mu m accounting for more than 50 percent and the granularity of less than or equal to 100 mu m accounting for more than 90 percent is obtained.
(3) Coating the surface of the powder material: atomized ballIn the falling process of the spherical powder in the atomizing chamber, the surface temperature of the spherical powder reaches 750 ℃, and at the moment, mixed gas of oxygen and carbon dioxide is blown from the side wall of the atomizing chamber, wherein the ratio of the gas in the mixed gas is oxygen: carbon dioxide is 1:3.5, the gas pressure of the atomizing nozzle is 1.2MPa, and the gas flow is 0.015m3And s. The silicon in the spherical powder has very strong bonding capacity with oxygen, the blown carbon dioxide can also promote the silicon element to generate silicon dioxide, and meanwhile, the blown carbon dioxide can also promote the temperature on the surface of the spherical powder to rapidly drop, so that the composite powder with the surface coating layer is obtained, and the surface coating layer contains silicon dioxide.
(4) Collecting composite powder: and cooling and collecting the composite powder, and screening according to the use requirement to obtain the composite powder material.
The composite powder material prepared by the embodiment does not need to be subjected to post-treatment, and the metal soft magnetic powder core is prepared by adopting 3D printing.
The metal soft magnetic powder core prepared from the composite powder material produced by the embodiment has the advantages of 85 magnetic conductivity, 1.7T saturation magnetic flux density and good comprehensive performance.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (7)
1. The composite powder material for manufacturing the metal soft magnetic powder core is characterized by comprising the following chemical components in percentage by weight, C is less than or equal to 0.020%, and Si: 5.8% -7.0%, Mn: 0.10 to 0.20 percent of iron, less than or equal to 0.010 percent of P, less than or equal to 0.010 percent of S, less than or equal to 0.003 percent of N, and the balance of iron and inevitable impurities.
2. The composite powder material for manufacturing a metallic soft magnetic powder core as claimed in claim 1, wherein said composite powder material has a magnetic permeability of 70 to 100H/m and a saturation magnetic flux density of 1.7 to 1.9T.
3. A method of preparing a composite powder material for the manufacture of a core of a metallic soft magnetic powder according to claim 1, comprising the steps of:
(1) electric furnace smelting:
putting an industrial pure iron raw material into a vacuum induction furnace for smelting, controlling the vacuum degree of the vacuum induction furnace to be 1-4 Pa, carrying out alloying treatment and molten steel component adjustment after the industrial pure iron raw material is completely molten, then raising the temperature of molten steel to 1581-1600 ℃, and finishing smelting;
(2) vacuum gas atomization:
carrying out vacuum atomization treatment on molten steel after tapping of a vacuum induction furnace by adopting a supersonic tightly-coupled gas atomization mode, wherein the inner diameter of an outlet of an atomization draft tube is 4-6 mm, the atomization gas is argon, the gas pressure at an atomization nozzle is 2-4 MPa, and the gas flow is 0.15-0.20 m3The atomization speed of the molten steel is 8-10 kg/min; the atomized metal powder is spherical powder;
(3) coating the surface of the powder material:
the surface temperature of the atomized spherical powder is 650-750 ℃ in the falling process of the atomization chamber, and at the moment, mixed gas of oxygen and carbon dioxide is blown in from the side wall of the atomization chamber; the gas pressure at the mixed gas nozzle is 1.2-1.8 MPa, and the gas flow is 0.008-0.015 m3(ii)/s, obtaining a composite powder having a surface coating layer, the surface coating layer containing silicon dioxide;
(4) collecting composite powder:
and cooling, collecting and screening the composite powder to obtain the composite powder material.
4. The method for preparing a composite powder material for manufacturing a metallic soft magnetic powder core according to claim 3, wherein in the step (1), ferrosilicon and ferromanganese are added during alloying, wherein the chemical components of the ferrosilicon comprise, by weight, 74% -80% of Si, less than or equal to 0.10% of C, less than or equal to 0.035% of P, less than or equal to 0.02% of S, and the balance of Fe and inevitable impurities; the ferromanganese comprises the following chemical components in percentage by weight: 85-92% of Mn, less than or equal to 0.20% of C, less than or equal to 0.10% of P, less than or equal to 0.002% of S, and the balance of iron and inevitable impurities.
5. The method for preparing a composite powder material for the manufacture of a metallic soft magnetic powder core according to claim 3, wherein the molten steel tapped from the vacuum induction furnace is poured into a tundish to be vacuum atomized in the step (2), and the tundish is preheated to 1150-1250 ℃.
6. A method for preparing a composite powder material for the manufacture of a metallic soft magnetic powder core according to claim 3, wherein in said step (2), the ratio of the particle size of 45 μm or less in said spherical powder is more than 50%, and the ratio of the particle size of 100 μm or less in said spherical powder is more than 90%.
7. The method for preparing a composite powder material for manufacturing a metallic soft magnetic powder core according to claim 3, wherein in the step (3), the ratio of oxygen to carbon dioxide in the mixed gas is 1: 3-4.
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| US5073409A (en) * | 1990-06-28 | 1991-12-17 | The United States Of America As Represented By The Secretary Of The Navy | Environmentally stable metal powders |
| JP2005146315A (en) * | 2003-11-12 | 2005-06-09 | Toyota Central Res & Dev Lab Inc | Powder for magnetic core, powder-compacted magnetic core, and their production method |
| CN113878125A (en) * | 2021-10-15 | 2022-01-04 | 泉州市鑫航新材料科技有限公司 | Preparation method of Fe-Si-Cr-Ge-Ti alloy soft magnetic powder through gas atomization |
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| US5073409A (en) * | 1990-06-28 | 1991-12-17 | The United States Of America As Represented By The Secretary Of The Navy | Environmentally stable metal powders |
| JP2005146315A (en) * | 2003-11-12 | 2005-06-09 | Toyota Central Res & Dev Lab Inc | Powder for magnetic core, powder-compacted magnetic core, and their production method |
| CN113878125A (en) * | 2021-10-15 | 2022-01-04 | 泉州市鑫航新材料科技有限公司 | Preparation method of Fe-Si-Cr-Ge-Ti alloy soft magnetic powder through gas atomization |
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| CN114951668A (en) * | 2022-05-31 | 2022-08-30 | 清远市晶瑞合金材料有限公司 | Soft magnetic powder for 3D printing and preparation method thereof |
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