CN109727745A - Iron-based soft magnetic composite material and preparation method - Google Patents
Iron-based soft magnetic composite material and preparation method Download PDFInfo
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- CN109727745A CN109727745A CN201811542992.5A CN201811542992A CN109727745A CN 109727745 A CN109727745 A CN 109727745A CN 201811542992 A CN201811542992 A CN 201811542992A CN 109727745 A CN109727745 A CN 109727745A
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Abstract
The embodiment of the invention discloses a kind of iron-based soft magnetic composite material and preparation method, include the following steps: iron-based magnetic powder carrying out plasma spheroidization processing；Obtain spherical magnetic powder；Spherical magnetic powder progress surface is given a protective coating to metal objects processing, iron-based soft magnetic composite material is obtained.The embodiment of the present invention obtains fine, spherical iron-base soft magnetic alloy powder by powder plasma spheroidising.Then spherical iron-base soft magnetic alloy powder is subjected to processing of giving a protective coating to metal objects, magnetic insulating coating is generated in iron-based magnetic powder surface in situ, the class ball-type ferrous metals soft magnetic powder of clad uniformly, fine and close is finally obtained, to realize the purpose for improving powder core magnetic conductivity and saturation induction density.
Description
Technical field
The present embodiments relate to the preparation technical field of magnetic material, in particular to a kind of iron-based soft magnetic composite material and
Preparation method.
Background technique
Metal magnetic powder core is using powder metallurgical technique, using soft magnetic powder as raw material, after the mixing with dielectric
Compression moulding and a kind of soft-magnetic composite material prepared.Metal magnetic powder core has the specific function of magnetoelectricity conversion and energy storage filtering,
It is widely used in the fields such as photovoltaic, charging pile and Switching Power Supply.The magnetic property and physical property of metal soft magnetic powder core are by raw material powder
Last ingredient and granularity, insulating wrapped, compression moulding and aftertreatment technology influence fairly obvious.In order to reduce in alternating magnetic field and high
Under frequency environment, the magnetic loss of metal soft magnetic powder core needs to coat one layer of high resistance insulating layer, Ke Yi great on soft magnetic granules surface
The big resistivity for improving metal soft magnetic powder core improves its frequency of use to reduce under its high frequency using the eddy-current loss generated.
Therefore, insulating wrapped is a mostly important link in soft magnetic-powder core preparation process, and insulating coating
Quality height will directly influence the magnetic property of soft magnetic-powder core.The insulating wrapped of metal soft magnetic powder core can substantially be divided into organic packet
It covers and inorganic coating.Organic coating is primarily referred to as resin cladding, including thermosetting resin (epoxy resin, phenolic resin, silicone resin
Deng) and thermoplastic resin (polypropylene, PBT, PPS, ethene-vinyl acetate polymer, nylon etc.).Inorganic coating type compares
More, common mainly has inorganic Phosphate coating (zinc phosphoric acid, iron phosphate, manganese phosphoric acid etc.) and metal oxide etc..But it is above-mentioned
Two methods method for coating forms nonmagnetic passivation layer in powder particle surface, there is the secondary of " magnetic dilution " to powder core and makees
With obvious, reduction powder core magnetic conductivity and saturation induction density, to influence the performance of powder core.
Summary of the invention
The embodiment of the present invention is designed to provide iron-based soft magnetic composite material and preparation method, so that iron-based magnetic powder table
Face in-situ preparation magnetism insulating coating, improves powder core magnetic conductivity and saturation induction density.
In order to solve the above technical problems, the embodiment provides a kind of preparation sides of iron-based soft magnetic composite material
Method includes the following steps:
Iron-based magnetic powder is subjected to plasma spheroidization processing；Obtain spherical magnetic powder；
Spherical magnetic powder progress surface is given a protective coating to metal objects processing, iron-based soft magnetic composite material is obtained.
It is prepared the embodiments of the present invention also provide a kind of preparation method by above-mentioned iron-based soft magnetic composite material
Iron-based soft magnetic composite material.
The embodiment of the present invention in terms of existing technologies, is obtained fine, spherical by powder plasma spheroidising
Iron-base soft magnetic alloy powder.Then spherical iron-base soft magnetic alloy powder is subjected to processing of giving a protective coating to metal objects, in iron-based magnetic powder surface in situ
Magnetic insulating coating is generated, the class ball-type ferrous metals soft magnetic powder of clad uniformly, fine and close is finally obtained, is mentioned to realize
The purpose of high powder core magnetic conductivity and saturation induction density.
It is 200-300 DEG C that in addition, surface is given a protective coating to metal objects, the step of handling, which includes: temperature, and the processing time is 20-120min, and water steams
Atmospheric pressure is 0.02MPa.
In addition, metal magnetic preparation method includes the following steps: to prepare after melting raw material by water atomization pulverization method
Iron-based magnetic powder；Wherein, it is 50-70MPa that the step of water atomization pulverization method, which includes: atomizing pressure, and drain pipe diameter is 5-8mm,
Water flow is 30-40L/min.
In addition, the temperature of melting is 1500-1610 DEG C, 2-3min is kept the temperature.
In addition, raw material includes: that raw material is laggard according to alloying component preset weight ratio progress weighing and burden the step of melting
Row melting, adds aluminium silicon intermediate alloy.
In addition, it includes reducibility gas that gas, which occurs, for the plasma in plasma spheroidization processing step.
In addition, reducibility gas be hydrogen, carbon monoxide, in methane gas any one or it is two or more.
In addition, the flow of reducibility gas is 0.5-12m3/h。
In addition, the average particle size of iron-based magnetic powder is 25 μm, oxygen content 1500ppm.
In addition, the oxygen content of iron-based soft magnetic composite material is 1500-3000ppm, the surface of iron-based soft magnetic composite material is wrapped
Be covered with ferroso-ferric oxide insulating layer, insulating layer with a thickness of 10-50nm.
Detailed description of the invention
One or more embodiments are illustrated by the picture in corresponding attached drawing, these exemplary theorys
The bright restriction not constituted to embodiment, the element in attached drawing with same reference numbers label are expressed as similar element, remove
Non- to have special statement, composition does not limit the figure in attached drawing.
Fig. 1 is the SEM shape appearance figure of the iron-based soft magnetic composite material in the embodiment of the present invention 1.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with attached drawing to the present invention
Each embodiment be explained in detail.However, it will be understood by those skilled in the art that in various embodiments of the present invention
In, in order to make the reader understand this application better, many technical details are proposed.But even if without these technical details and
Based on the various changes and modifications of following embodiment, the application technical solution claimed also may be implemented.
Embodiment 1
The present embodiment is related to a kind of preparation method of iron-based soft magnetic composite material, includes the following steps:
Choosing ingot iron, polysilicon, aluminium silicon intermediate alloy, electrolytic nickel and electrolytic manganese first is raw material, is closed by FeSiAl
The mass percent of gold is Fe 84.5%, Si 9.5%, Al5.5% carry out calculating ingredient, and wherein Ni and manganese content are 0.1%.
Mid-frequency melting furnace is first added in above-mentioned raw materials pure iron, polysilicon and electrolytic nickel, manganese, alloy melting temp is 1500-1600 DEG C, is protected
Then warm 3min adds sial intermediate alloy；
Alloy melt is prepared by alloy powder using water atomization pulverization technique, it should be noted that water atomization pulverization side
Method mainly have compared with other milling methods low segregation, high solidification rate, almost spherical or irregular shape, ingredient it is uniform,
The features such as oxygen content is low, operating principle are injected directly in metal or alloy liquid stream using high pressure water flow, force to crush simultaneously
Accelerated solidification.The metal or alloy powder of water atomization preparation, due to atomization parameter is different and the property of alloy powder itself not
Together, almost spherical or irregular shape are formed；It can be by changing the techniques such as hydraulic pressure, range of atomization water level, the metallic solution degree of superheat
Parameter controls shape and recovery rate.Specifically, water atomization pressure is 60MPa, and drain pipe diameter is 8mm, water flow 35L/
min.The powder mean particle sizes D50 being prepared is 25 μm, oxygen content 1500ppm；
The water atomization FeSiAl alloy powder of preparation is subjected to drying and processing, and sieves -200 mesh finished powders.It will dry again
FeSiAl alloy powder dry, after screening carries out spheroidising by plasma spraying equipment, and it is 60KW that equipment, which runs power, is adopted
Use argon gas and argon gas/hydrogen mixed gas that gas occurs as plasma, flow is respectively 2m3/ h and 0.5m3/ h, powder pass through
The melting of ion at high temperature area, nodularization and one step of reduction treatment are completed.It is handled by plasma spheroidization, powder is become from irregular shape
It is spherical；
Spheroidising powder progress surface is given a protective coating to metal objects processing, temperature is 300 DEG C, and the processing time is 120min, water vapor pressure
Power is 0.02MPa.After above-mentioned processing, FeSiAl/Fe is prepared3O4Composite soft magnetic powder magnetic, as shown in Figure 1, its pattern is
Spherical, D50 is 20 μm, oxygen content 3000ppm, surface Fe3O4Thin-film cladding layer is with a thickness of 50nm.
This have the advantage that:
(1) embodiment of the present invention combines plasma spheroidization shaping and processing of giving a protective coating to metal objects, and has both met low cost, minute spherical
The preparation of soft magnetic powder, and realize the in-situ preparation of powder surface passivation layer, the powder of preparation has fine, spherical and height electric
The advantages of resistance rate；
(2) embodiment of the present invention is given a protective coating to metal objects processing by powder surface, the reaction of iron-based powder surface in situ form uniformly,
Fine and close Fe3O4Clad is coated, insulating wrapped is can effectively reduce and the magnetic of soft magnetic powder is diluted, improve powder magnetic conductivity and drop
Low magnetic loss；
(3) simple process of the embodiment of the present invention, high-efficient, pollution-free, can effectively realize inexpensive, fine, spherical
Fe3O4The technology of preparing that core-shell structure coats iron based soft magnetic powder is broken through.Meanwhile the technology is easy to large-scale production popularization.
Embodiment 2
The present embodiment is related to a kind of preparation method of iron-based soft magnetic composite material, includes the following steps:
It chooses ingot iron, electrolytic nickel first as raw material, is Fe 50%, Ni 50% by the mass percent of FeNi alloy
Calculating ingredient is carried out, mid-frequency melting furnace is added in above-mentioned raw materials, alloy melting temp is 1520-1610 DEG C, keeps the temperature 2min；
Alloy melt is prepared by alloy powder using water atomization pulverization technique, water atomization pressure is 70MPa, and catheter is straight
Diameter is 6mm, water flow 40L/min.Preparing powder mean particle sizes D50 is 15 μm, oxygen content 1000ppm；
The water atomization FeNi50 alloy powder of preparation is subjected to drying and processing, and sieves -200 mesh finished powders.It will dry again
FeNi50 alloy powder dry, after screening carries out spheroidising by plasma spheroidization equipment, and it is 80KW that equipment, which runs power, is adopted
Plasma system is full of with argon gas.Gas, argon gas are occurred as side gas and plasma using argon gas and argon gas/hydrogen mixed gas
As carrier gas.Flow is respectively 12m3/h、9m3/h+3m3/ h and 4m3/ h, powder pass through the melting of plasma high-temperature region, nodularization, powder
End becomes spherical from irregular shape；
Spheroidising powder progress surface is given a protective coating to metal objects processing, temperature is 200 DEG C, and the processing time is 20min, water vapour pressure
For 0.02MPa.After above-mentioned processing, FeNi/Fe is prepared3O4Composite soft magnetic powder magnetic, pattern are spherical, D50 18
μm, oxygen content 1500ppm, surface Fe3O4Thin-film cladding layer is with a thickness of 10nm.
Comparative example 1
Comparative example 1 is compared with Examples 1 to 2, and difference is that plasma spheroidization processing step is omitted, and comparative example 1 is implemented
The performance parameter for the iron-based soft magnetic composite material that example 1~2 is prepared such as table 1:
Table 1: the performance parameter for the iron-based soft magnetic composite material that Examples 1 to 2 is prepared with comparative example 1
It should be noted that iron-based soft magnetic composite material granularity is smaller, i.e., powder is thinner, and surface area is bigger, and interface is bigger,
The area of insulating wrapped agent cladding is more, and resistivity is bigger, so that the eddy-current loss of iron-based soft magnetic composite material reduces.
In addition, the oxygen content of iron-based soft magnetic composite material is higher, iron-based soft magnetic composite inner is more oxidized easily,
To cause magnetic capacity to reduce, magnetic conductivity can decline, and eddy-current loss increases；And Fe3O4Film thickness is bigger, and iron-based soft magnetic is multiple
The resistivity of condensation material is high, so that eddy-current loss reduces.
As shown in Table 1, excellent iron-based of the magnetic property that Examples 1 to 2 is prepared by plasma spheroidization processing step
The excellent magnetic energy of soft-magnetic composite material magnetic conductivity with higher, DC stacked special efficacy and low magnetic loss.
It will be understood by those skilled in the art that the various embodiments described above are realization specific embodiments of the present invention, and
In practical applications, can to it, various changes can be made in the form and details, without departing from the spirit and scope of the present invention.
Claims (10)
1. a kind of preparation method of iron-based soft magnetic composite material, which comprises the steps of:
Iron-based magnetic powder is subjected to plasma spheroidization processing；Obtain spherical magnetic powder；
The spherical magnetic powder is carried out surface to give a protective coating to metal objects processing, obtains iron-based soft magnetic composite material.
2. the preparation method of iron-based soft magnetic composite material according to claim 1, which is characterized in that
Surface the step of handling of giving a protective coating to metal objects include:
Temperature is 200-300 DEG C, and the processing time is 20-120min, water vapour pressure 0.02MPa.
3. the preparation method of iron-based soft magnetic composite material according to claim 1, which is characterized in that
The metal magnetic preparation method includes the following steps:
Iron-based magnetic powder is prepared by water atomization pulverization method after raw material is melted；Wherein, the step of water atomization pulverization method
Include:
Atomizing pressure is 50-70MPa, and drain pipe diameter is 5-8mm, water flow 30-40L/min.
4. the preparation method of iron-based soft magnetic composite material according to claim 3, which is characterized in that
The temperature of the melting is 1500-1610 DEG C, keeps the temperature 2-3min.
5. the preparation method of iron-based soft magnetic composite material according to claim 3, which is characterized in that the raw material melting
Step includes:
It is melted after raw material is carried out weighing and burden according to alloying component preset weight ratio, adds aluminium silicon intermediate alloy.
6. the preparation method of iron-based soft magnetic composite material according to claim 1, which is characterized in that
It includes reducibility gas that gas, which occurs, for the plasma in the plasma spheroidization processing step.
7. the preparation method of iron-based soft magnetic composite material according to claim 6, which is characterized in that
It is any one or more of that the reducibility gas is selected from hydrogen, carbon monoxide, methane.
The flow of the reducibility gas is 0.5-12m3/h。
8. the preparation method of described in any item iron-based soft magnetic composite materials according to claim 1~7, which is characterized in that
The average particle size of the iron-based magnetic powder is 25 μm, oxygen content 1500ppm.
9. a kind of preparation method by iron-based soft magnetic composite material according to any one of claims 1 to 8 is prepared iron-based
Soft-magnetic composite material.
10. iron-based soft magnetic composite material according to claim 9, which is characterized in that
The oxygen content of the iron-based soft magnetic composite material is 1500-3000ppm,
The surface of the iron-based soft magnetic composite material is coated with ferroso-ferric oxide insulating layer, the insulating layer with a thickness of 10-
50nm。
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| CN110571009A (en) * | 2019-08-27 | 2019-12-13 | 广东咏旺新材料科技有限公司 | Iron-based spheroidized micro-nano magnetic powder core and preparation method thereof |
| CN115064328A (en) * | 2022-07-27 | 2022-09-16 | 厦门慧金盟磁电有限公司 | Low-power-consumption soft magnetic alloy material and preparation method thereof |
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Application publication date: 20190507 |