Metal soft magnetic powder core, preparation method of metal soft magnetic powder core and application of metal soft magnetic powder core

Abstract

The invention provides a metal soft magnetic powder core, a preparation method of the metal soft magnetic powder core and application of the metal soft magnetic powder core, and the preparation method of the metal soft magnetic powder core comprises the steps that S1, metal soft magnetic powder is firstly subjected to insulation coating and then subjected to compression molding, and a magnetic powder core sample ring is obtained; and S2, the magnetic powder core sample ring is subjected to frequency spectrum vibration aging treatment, and the metal soft magnetic powder core is obtained. According to the preparation method of the metal soft magnetic powder core, the internal stress of the magnetic powder core can be quickly eliminated and the magnetic hysteresis loss is reduced by adopting the frequency spectrum vibration aging treatment, the preparation method is simple in preparation process, short in treatment time, low in cost and low in energy consumption, a high-temperature treatment process is avoided, and the metal soft magnetic powder core with high magnetic conductivity and low loss can be prepared.

Description

Technical Field

[0001] The present invention relates to the field of metal soft magnetic materials, and in particular to a metal soft magnetic powder core, a preparation method of the metal soft magnetic powder core and applications thereof. Background Art

[0002] Soft magnetic materials are an important type of magnetic functional materials in the development of modern economy and society. Metallic soft magnetic materials have electromagnetic conversion functions, and play a role in energy transfer, conversion and coupling. They are widely used in 5G communications, consumer electronics, information technology, intelligent manufacturing and other fields because of their distributed air gaps, low losses, high saturation magnetization intensity, and excellent DC superposition characteristics. First, the metal soft magnetic powder is insulated and coated to increase the resistivity, and then pressed and subjected to high-temperature heat treatment to prepare a metal magnetic powder core. Among them, heat treatment can eliminate the internal stress caused by the molding process, reduce hysteresis loss and total loss, and improve its high-frequency application characteristics.

[0003] At present, the main method to eliminate internal stress is high-temperature heat treatment, that is, heating the magnetic powder core to a high temperature and keeping it warm for a period of time, which can eliminate the participating stress and improve the strength of the powder core, while increasing the magnetic permeability of the magnetic powder core and reducing high-frequency losses. However, high-temperature heat treatment can easily destroy the insulating layer on the surface of the metal particles, reduce the resistance of the powder core, and worsen the high-frequency eddy current loss.

[0004] There are two main ways to eliminate stress: natural aging and thermal aging. Traditional metal magnetic powder cores use thermal aging to eliminate internal stress, but thermal aging is costly, energy-intensive, and has a long cycle. In addition, thermal aging is prone to oxidation, has poor temperature uniformity, and is prone to secondary deformation.

[0005] In view of this, the present invention is proposed. Summary of the invention

[0006] The main purpose of the present application is to provide a method for preparing a metal soft magnetic powder core, so as to solve the problem that the existing technology uses high-temperature heat treatment to eliminate internal stress, which is easy to damage the surface insulation layer of the metal particles, reduce the resistance of the metal soft magnetic powder core, and cause the high-frequency eddy current loss to worsen.

[0007] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, a method for preparing a metal soft magnetic powder core is provided, and the preparation method comprises: step S1, first insulating and coating the metal soft magnetic powder, and then pressing and molding the metal soft magnetic powder to obtain a magnetic powder core sample ring; step S2, performing spectrum vibration aging treatment on the magnetic powder core sample ring to obtain a metal soft magnetic powder core.

[0008] Furthermore, in step S1, the pressure of the pressing molding is 1000-3000 MPa.

[0009] Further, in step S2, the exciting force of the spectrum vibration aging is 5 to 25 KN; and / or, the speed regulation range of the spectrum vibration aging is 500 to 6000 r / min, and its steady speed accuracy is ±1 r / min; and / or, the time of the spectrum vibration aging is 30 to 240 min. Further, in step S1, the particle size of the metal soft magnetic powder is 200 to 1000 mesh.

[0010] Furthermore, in step S1, the material of the metal soft magnetic powder includes at least one of sendustine, iron-nickel, iron-silicon, iron-nickel-molybdenum, and amorphous nanocrystals.

[0011] Furthermore, in step S1, the material of the coating used in the insulation coating process includes at least one of an acidic substance, an inorganic insulating agent, and a silicone resin.

[0012] Furthermore, the acidic substance includes at least one of phosphoric acid, oxalic acid and boric acid.

[0013] Furthermore, the acidic substance is phosphoric acid.

[0014] Furthermore, the inorganic insulating agent includes at least one of silicon oxide, aluminum oxide, magnesium oxide, kaolin, mica powder, and diatomaceous earth.

[0015] Furthermore, the material of the coating includes an acidic substance, an inorganic insulating agent and a silicone resin. Based on the metal soft magnetic powder, the mass content of the acidic substance is 0.1-0.6%, the mass content of the inorganic insulating agent is 1-1.5%, and the mass content of the silicone resin is 0.1-0.6%.

[0016] Furthermore, in step S1, at least one of an adhesive and a release agent is added during the compression molding process.

[0017] Furthermore, the adhesive includes at least one of polyvinyl alcohol, polyurethane, epoxy resin, and polyacrylate, and the mass ratio of the adhesive to the metal soft magnetic powder is (0.5-2.5):100.

[0018] Furthermore, the release agent includes at least one of zinc stearate / magnesium / aluminum, graphite, and talcum powder, and the mass ratio of the release agent to the metal soft magnetic powder is (0.1-1.5):100.

[0019] In order to achieve the above objective, according to one aspect of the present invention, a metal soft magnetic powder core is provided. The metal soft magnetic powder core is prepared by the preparation method of the metal soft magnetic powder core according to the first aspect.

[0020] According to another aspect of the present invention, there is provided an application of a metal soft magnetic powder core of the second aspect or a metal soft magnetic powder core obtained by the preparation method of the metal soft magnetic powder core of the first aspect in the fields of 5G communications, consumer electronics, information technology, intelligent manufacturing, etc.

[0021] By applying the technical solution of the present application, the preparation method of the metal soft magnetic powder core provided by the present application can quickly eliminate the internal stress of the magnetic powder core and reduce the hysteresis loss by adopting spectrum vibration aging treatment. The preparation method has a simple preparation process, short processing time, low cost, low energy consumption, avoids high-temperature treatment process, and can produce a metal soft magnetic powder core with high magnetic permeability and low loss. DETAILED DESCRIPTION

[0022] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below in conjunction with the embodiments.

[0023] As analyzed in the background technology of this application, since the prior art uses a high-temperature heat treatment method to eliminate the internal stress caused by the metal soft magnetic powder during the pressing and molding process, the high-temperature heat treatment will destroy the insulating layer on the surface of the metal particles, reduce the resistance of the metal magnetic powder core, and worsen the high-frequency eddy current loss. In order to solve this problem, this application provides a metal soft magnetic powder core, a preparation method of a metal soft magnetic powder core, and its application.

[0024] In a typical embodiment of the present application, a method for preparing a metal soft magnetic powder core is provided, and the preparation method comprises: step S1, insulating and coating the metal soft magnetic powder, and obtaining a magnetic powder core sample ring after pressing and molding; step S2, performing spectrum vibration aging treatment on the magnetic powder core sample ring to obtain a metal soft magnetic powder core.

[0025] By applying the technical solution of the present application, the preparation method of the metal soft magnetic powder core provided by the present application can quickly eliminate the internal stress of the magnetic powder core and reduce the hysteresis loss by adopting spectrum vibration aging treatment. The preparation method has a simple preparation process, short processing time, low cost, low energy consumption, avoids high-temperature treatment process, and can produce a metal soft magnetic powder core with high magnetic permeability and low loss.

[0026] The present application prepares a metal soft magnetic powder core with excellent performance by first coating the surface of the metal soft magnetic powder and then pressing it into shape, and cooperating with spectrum vibration aging treatment, which has both high magnetic permeability and low loss.

[0027] In some embodiments, the material of the metal soft magnetic powder is not limited and is the common metal soft magnetic powder in the art. The material of the metal soft magnetic powder used in this application includes at least one of iron silicon aluminum, iron nickel, iron silicon, iron nickel molybdenum, and amorphous nanocrystals.

[0028] In order to further improve the effect of insulation coating, the particle size of the metal soft magnetic powder is preferably 200-1000 mesh. Within the above range, it is more conducive to the coating to tightly coat the metal soft magnetic powder, so that the comprehensive performance of the prepared metal soft magnetic powder core is better.

[0029] The material of the coating used in the above-mentioned insulation coating process includes at least one of an acidic substance, an inorganic insulating agent, and a silicone resin. The acidic substance includes at least one of phosphoric acid, oxalic acid, and boric acid, preferably phosphoric acid. Phosphoric acid reacts chemically with the metal soft magnetic powder to form a very thin, dense, well-covered, and firmly adsorbed passivation film on the surface of the metal soft magnetic powder. By coating the passivation film on the surface of the metal soft magnetic powder particles, the resistivity of the metal soft magnetic powder can be effectively increased and the eddy current loss can be reduced. In addition, the metal soft magnetic powder is not easy to participate in the reaction, which is more conducive to insulating coating and avoiding reactions during the coating process.

[0030] In some embodiments, the above-mentioned inorganic insulating agent includes at least one of magnesium oxide, silicon oxide, aluminum oxide, magnesium oxide, kaolin, mica powder, and diatomaceous earth, preferably kaolin, and its average particle size is 0.05-15 μm. The inorganic insulating agent can be mixed with water and attached to the surface of the metal soft magnetic powder by physical adsorption, forming contact resistance on its surface, thereby achieving an insulating effect.

[0031] The silicone resin has the characteristic of high decomposition temperature. By coating the metal soft magnetic powder, the heat resistance of the metal soft magnetic powder can be further improved. In addition, the film formed on the surface of the metal soft magnetic powder has no cracks, good density, and uniformity, which can play a good insulation effect and effectively reduce the loss of the metal soft magnetic powder core under high-frequency applications. In addition, the silicone resin also has a bonding effect, which can effectively improve the mechanical strength of the metal soft magnetic powder core.

[0032] In some embodiments, the specific operating steps of the metal soft magnetic powder insulation coating process include: mixing the metal soft magnetic powder with an acidic substance, passivating the metal soft magnetic powder, and then fully mixing it with an inorganic insulating agent, performing a first insulation coating on the passivated metal soft magnetic powder, and finally adding silicone resin and performing a second insulation coating to obtain the metal soft magnetic powder after insulation coating.

[0033] In order to further improve the comprehensive performance of the metal soft magnetic powder, based on the metal soft magnetic powder, the mass content of the acidic substance is 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6% or a range consisting of any two values, the mass content of the inorganic insulating agent is 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5% or a range consisting of any two values, and the mass content of the silicone resin is 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6% or a range consisting of any two values. The mass content of each component of the coating is within the above range, which can form an insulating material on the surface of the metal soft magnetic powder, thereby hindering the eddy current between the metal soft magnetic powder particles and effectively reducing the eddy current loss.

[0034] In other embodiments, any one or both of an adhesive and a release agent are added during the above-mentioned pressing process.

[0035] The above-mentioned adhesive is not limited and is a common adhesive in the field. The present application adopts at least one of polyvinyl alcohol, polyurethane, epoxy resin, and polyacrylate, and the mass ratio of the adhesive to the metal soft magnetic powder is (0.5-2.5): 100. Among them, by adding the adhesive during the pressing process, the adhesive can not only make the metal soft magnetic powder after the insulation coating aggregate and bond, but also improve the resistivity of the metal soft magnetic powder core, which is beneficial to increase the internal air gap of the metal soft magnetic powder core and reduce power loss. If the adhesive content is too high, the internal air gap rate of the metal soft magnetic powder core will increase, the magnetic permeability of the metal soft magnetic powder core will be reduced, and the power density loss of the metal soft magnetic powder core will increase. If the adhesive content is too low, the metal soft magnetic powder cannot be fully aggregated and bonded, which is not conducive to pressing and molding, and further affects the comprehensive performance of the metal soft magnetic powder core. The amount of adhesive used within the above range is conducive to the molding of metal soft magnetic powder.

[0036] In some embodiments, the release agent is a common release agent in the art. The release agent used in the present application includes at least one of zinc stearate / magnesium / aluminum, graphite, and talcum powder. In addition, the mass ratio of the release agent to the metal soft magnetic powder is (0.1-1.5): 100. After the release agent is applied to the surface of the mold, a thin film can be formed to protect the mold surface, prevent the magnetic powder core sample ring from sticking to the mold, reduce the impact force of the magnetic powder core sample ring forming on the mold, reduce wear, and play a lubricating role; in addition, the temperature of each part of the mold can also be adjusted to maintain the temperature balance of the mold, improve the formability of the magnetic powder core sample ring, thereby improving the mold life, and to a certain extent, ensure the quality of the magnetic powder core sample ring. Controlling the amount of the release agent within the above range is conducive to improving the fluidity of the metal soft magnetic powder, making the density distribution more uniform during the molding process, and not sticking to the mold.

[0037] In some embodiments, the above-mentioned soft magnetic metal powder after insulation coating is pressed and formed, and the pressing and forming process includes mixing the soft magnetic metal powder after insulation coating with at least one of an adhesive and a release agent, and then pressing and forming with a hydraulic press to obtain a magnetic powder core sample ring. Among them, the pressing and forming pressure is 1000-3000MPa. When the pressure is within the above range, the prepared magnetic powder core sample ring has a more stable structure and better performance. However, stress will be introduced inside the magnetic powder core sample ring during the pressing and forming process, resulting in increased hysteresis loss. In the subsequent process, the stress inside the magnetic powder core sample ring is eliminated by using spectrum vibration aging treatment to obtain a metal soft magnetic powder core.

[0038] In this application, spectrum vibration aging is based on the principle of vibration aging, applies advanced electronic information technology, performs spectrum analysis through Fourier method, searches for low-order harmonics, automatically selects appropriate energy to vibrate at multiple harmonic frequencies, causes cumulative vibration of high-order harmonics, generates multi-directional dynamic stress, and superimposes with multi-dimensionally distributed residual stress, causing plastic yield, thereby reducing peak residual stress and homogenizing the residual stress distribution.

[0039] In some embodiments, the equipment used for spectrum vibration aging treatment is not limited. The equipment used in this application is a spectrum resonance equipment. During the spectrum vibration aging treatment process, the exciter of the spectrum resonance equipment is used to apply periodic external force to the magnetic powder core sample ring.

[0040] In order to further improve the efficiency of eliminating the internal stress of the metal soft magnetic powder core, the excitation force of the spectrum vibration aging is preferably 5 to 25 KN. If the excitation force of the spectrum vibration aging is too large, the surface insulation resistance layer of the magnetic powder core sample ring will be destroyed. If the excitation force is too small, it cannot eliminate the internal stress of the metal soft magnetic powder core. Within the above range, the efficiency of eliminating the internal stress of the metal soft magnetic powder core can be effectively improved. In addition, the speed regulation range of the spectrum vibration aging is set to 500 to 6000 r / min, and its steady speed accuracy is ±1 r / min. The frequency is swept from low speed to high speed. When the frequency of the applied external force is consistent with the natural frequency of the magnetic powder core sample ring, resonance will occur. All natural frequencies that can produce resonance are found, and then vibration is applied to the magnetic powder core sample ring in the sub-resonance region of the resonance frequency. At this resonance frequency, the time of the spectrum vibration aging is 30 to 240 minutes. The spectrum aging treatment time is short, which can quickly eliminate the internal stress of the magnetic powder core and reduce hysteresis loss. In addition, costs are saved and energy consumption is reduced.

[0041] In a second typical embodiment of the present application, a metal soft magnetic powder core is provided, which is obtained by the preparation method provided in the first typical embodiment. The metal soft magnetic powder core has high magnetic permeability and low loss.

[0042] In the third typical embodiment of the present application, the application of the metal soft magnetic powder core of the second typical embodiment or the metal soft magnetic powder core obtained by the preparation method of the first typical embodiment in the fields of 5G communications, consumer electronics, information technology, intelligent manufacturing, etc. is provided.

[0043] The beneficial effects of the present application will be further illustrated below in combination with embodiments and comparative examples.

[0044] Example 1

[0045] This embodiment provides a metal soft magnetic powder core, and the preparation method thereof comprises the following steps:

[0046] (1) 500 mesh iron-nickel soft magnetic powder was fully mixed with 0.2wt% phosphoric acid for passivation, the passivated iron-nickel soft magnetic powder was fully mixed with 1wt% kaolin insulation and stirred for the first coating, and then 0.5wt% silicone resin was added and mixed evenly for the second coating, the metal soft magnetic powder after insulation coating was fully mixed with 0.5wt% epoxy resin and 0.1wt% aluminum stearate, and molded at a molding pressure of 1000MPa to prepare a Φ14mm*Φ8mm magnetic powder core sample ring.

[0047] (2) Use the exciter of the spectrum resonance equipment to apply a periodic external force to the magnetic powder core sample ring. The excitation force is 5 kN. The vibration speed is adjusted in the range of 500-6000 r / min, and the frequency is swept from low speed to high speed. When the frequency of the applied external force is in sync with the natural frequency of the magnetic powder core sample ring, resonance is generated. Find all the natural frequencies that can produce resonance, and then apply vibration to the workpiece in the sub-resonance region of the resonance frequency. The vibration time is 30 minutes to obtain a metal soft magnetic powder core.

[0048] Example 2

[0049] This embodiment provides a metal soft magnetic powder core, and the preparation method thereof comprises the following steps:

[0050] (1) 500 mesh iron-nickel soft magnetic powder was fully mixed with 0.2wt% phosphoric acid for passivation, the passivated iron-nickel soft magnetic powder was fully mixed with 1wt% kaolin insulation and stirred for the first coating, and then 0.5wt% silicone resin was added and mixed evenly for the second coating, the metal soft magnetic powder after insulation coating was fully mixed with 1.5wt% epoxy resin and 1wt% aluminum stearate, and molded at a molding pressure of 1500MPa to prepare a Φ14mm*Φ8mm magnetic powder core sample ring.

[0051] (2) Use the exciter of the spectrum resonance equipment to apply a periodic external force to the magnetic powder core sample ring. The excitation force is 15KN. The vibration speed is adjusted in the range of 500-6000r / min, and the frequency is swept from low speed to high speed. When the frequency of the applied external force is in sync with the natural frequency of the magnetic powder core sample ring, resonance is generated. Find all the natural frequencies that can produce resonance, and then apply vibration to the workpiece in the sub-resonance region of the resonance frequency. The vibration time is 90 minutes to obtain a metal soft magnetic powder core.

[0052] Example 3

[0053] This embodiment provides a metal soft magnetic powder core, and the preparation method thereof comprises the following steps:

[0054] (1) 500 mesh iron silicon soft magnetic powder was fully mixed with 0.5wt% phosphoric acid for passivation, the passivated iron silicon soft magnetic powder was fully mixed with 1.5wt% kaolin insulation and stirred for the first coating, and then 0.5wt% silicone resin was added and mixed evenly for the second coating, the metal soft magnetic powder after insulation coating was fully mixed with 1.0wt% epoxy resin and 0.5wt% aluminum stearate, and molded at a molding pressure of 2000MPa to prepare a Φ14mm*Φ8mm magnetic powder core sample ring.

[0055] (2) Use the exciter of the spectrum resonance equipment to apply periodic external force to the magnetic powder core sample ring. The excitation force is 15KN. The vibration speed is adjusted in the range of 500-6000r / min, and the frequency is swept from low speed to high speed. When the frequency of the applied external force is in sync with the natural frequency of the magnetic powder core sample ring, resonance is generated. Find all the natural frequencies that can produce resonance, and then apply vibration to the workpiece in the sub-resonance region of the resonance frequency. The vibration time is 120min to obtain a metal soft magnetic powder core.

[0056] Example 4

[0057] This embodiment provides a metal soft magnetic powder core, and the preparation method thereof comprises the following steps:

[0058] (1) 500 mesh iron silicon soft magnetic powder was fully mixed with 0.5wt% phosphoric acid for passivation, the passivated iron silicon soft magnetic powder was fully mixed with 1.5wt% kaolin insulation and stirred for the first coating, and then 0.5wt% silicone resin was added and mixed evenly for the second coating, the metal soft magnetic powder after insulation coating was fully mixed with 1.5wt% epoxy resin and 1wt% aluminum stearate, and molded at a molding pressure of 3000MPa to prepare a Φ14mm*Φ8mm magnetic powder core sample ring.

[0059] (2) Use the exciter of the spectrum resonance equipment to apply a periodic external force to the magnetic powder core sample ring. The excitation force is 25 kN. The vibration speed is adjusted in the range of 500-6000 r / min, and the frequency is swept from low speed to high speed. When the frequency of the applied external force is in sync with the natural frequency of the magnetic powder core sample ring, resonance is generated. All natural frequencies that can produce resonance are found, and then vibration is applied to the workpiece in the sub-resonance region of the resonance frequency. The vibration time is 240 minutes to obtain a metal soft magnetic powder core.

[0060] Example 5

[0061] The difference between this embodiment and embodiment 2 is that the molding pressure is 3000 MPa.

[0062] Example 6

[0063] The difference between this embodiment and embodiment 2 is that the molding pressure is 1000 MPa.

[0064] Example 7

[0065] The difference between this embodiment and embodiment 2 is that the molding pressure is 500 MPa.

[0066] Example 8

[0067] The difference between this embodiment and embodiment 2 is that the molding pressure is 5000 MPa.

[0068] Example 9

[0069] The difference between this embodiment and embodiment 2 is that the exciting force is 25 KN.

[0070] Example 10

[0071] The difference between this embodiment and embodiment 2 is that the exciting force is 5 KN.

[0072] Embodiment 11

[0073] The difference between this embodiment and embodiment 2 is that the exciting force is 50 KN.

[0074] Example 12

[0075] The difference between this embodiment and embodiment 2 is that the exciting force is 1 KN.

[0076] Embodiment 13

[0077] The difference between this embodiment and embodiment 2 is that the spectrum vibration aging time is 240 minutes, and the vibration speed regulation is within the range of 500r / min.

[0078] Embodiment 14

[0079] The difference between this embodiment and embodiment 2 is that the spectrum vibration aging time is 30 minutes, and the vibration speed regulation is within the range of 6000r / min.

[0080] Embodiment 15

[0081] The difference between this embodiment and embodiment 2 is that the spectrum vibration aging time is 10 minutes, and the vibration speed regulation is within the range of 6000r / min.

[0082] Example 16

[0083] The difference between this embodiment and embodiment 2 is that the spectrum vibration aging time is 300 minutes and the vibration speed regulation is within the range of 500r / min.

[0084] Comparative Example 1

[0085] This comparative example provides a metal soft magnetic powder core, and the preparation method thereof comprises the following steps:

[0086] (1) 500 mesh iron-nickel soft magnetic powder was fully mixed with 0.2wt% phosphoric acid for passivation, the passivated iron-nickel soft magnetic powder was fully mixed with 1wt% kaolin insulation and stirred for the first coating, and then 0.5wt% silicone resin was added and mixed evenly for the second coating, the metal soft magnetic powder after insulation coating was fully mixed with 0.5wt% epoxy resin and 0.1wt% aluminum stearate, and molded at a molding pressure of 1000MPa to prepare a Φ14*Φ8mm magnetic powder core sample ring.

[0087] (2) The magnetic powder core sample ring is placed in a tubular furnace, and nitrogen is introduced to heat it to 600°C and keep it warm for 30 minutes. After the insulation is completed, the magnetic powder core sample ring is cooled in the furnace to obtain a metal soft magnetic powder core.

[0088] Comparative Example 2

[0089] This comparative example provides a metal soft magnetic powder core, and the preparation method thereof comprises the following steps:

[0090] (1) 500 mesh iron silicon soft magnetic powder was fully mixed with 0.5wt% phosphoric acid for passivation, the passivated iron silicon soft magnetic powder was fully mixed with 1.5wt% kaolin insulation and stirred for the first coating, and then 0.5wt% silicone resin was added and mixed evenly for the second coating, the metal soft magnetic powder after insulation coating was fully mixed with 1.0wt% epoxy resin and 0.5wt% aluminum stearate, and molded at a molding pressure of 2000MPa to prepare a Φ14*Φ8mm magnetic powder core sample ring.

[0091] (2) The magnetic powder core sample ring is placed in a tubular furnace, and nitrogen is introduced to heat it to 700°C and keep it warm for 30 minutes. After the insulation is completed, the magnetic powder core sample ring is cooled in the furnace to obtain a metal soft magnetic powder core.

[0092] Test Example 1

[0093] The metal soft magnetic powder cores prepared in the examples and comparative examples were tested for magnetic permeability, loss Pcv (core loss) (50kHz, 100mT), and loss Pcv (core loss) (100kHz, 100mT). The results are shown in Table 1 below.

[0094] in:

[0095] (1) Magnetic permeability test:

[0096] A copper wire with a diameter of 0.4 mm was used to evenly wind 30 turns on the metal soft magnetic powder cores prepared in the embodiment and the comparative example, respectively. The test conditions were 100 kHz, 1 V, and 25° C.;

[0097] (2) Loss Pcv (50kHz, 100mT) (100kHz, 100mT) test:

[0098] A copper wire with a diameter of 0.4 mm was used to evenly wind 30*5 turns on the metal soft magnetic powder cores prepared in the embodiment and the comparative example, respectively. The test conditions were 50 kHz, 100 mT, 25°C and 100 kHz, 100 mT, 25°C.

[0099] Table 1

[0100]

[0101]

[0102] From the above description, it can be seen that the above-mentioned embodiments of the present invention achieve the following technical effects: the preparation method of the metal soft magnetic powder core provided in the present application can quickly eliminate the internal stress of the magnetic powder core and reduce the hysteresis loss by adopting spectrum vibration aging treatment, thereby obtaining a metal soft magnetic powder core with high magnetic permeability, low loss and simple preparation process. Among them, the magnetic permeability of the iron-nickel soft magnetic powder core prepared by the preparation method of Example 2 is 107, and the loss is 151mW / cm under the conditions of 50kHz, 100mT and 25℃. 3 And the loss at 100kHz, 100mT, 25℃ is 331mW / cm 3 , which is better than other iron-nickel soft magnetic powder cores; the magnetic permeability of the iron-silicon soft magnetic powder core prepared according to the preparation method of Example 4 is 72, and the loss is 418mW / cm under 50kHz, 100mT, and 25℃. 3 And the loss at 100kHz, 100mT, 25℃ is 867mW / cm 3 , the performance of the iron silicon soft magnetic powder core prepared in Example 3 and Comparative Example 2 is better. In addition, the preparation method of the metal soft magnetic powder core provided in the present application has short processing time, low cost, low energy consumption, and can avoid high temperature processing.

[0103] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for preparing a metal soft magnetic powder core, characterized in that: The preparation method comprises: Step S1, insulating and coating the metal soft magnetic powder first, and then pressing and molding it to obtain a magnetic powder core sample ring; Step S2, subjecting the magnetic powder core sample ring to spectrum vibration aging treatment to obtain the metallic soft magnetic powder core.

2. The method for preparing the metal soft magnetic powder core according to claim 1, characterized in that: In the step S1, the pressure of the pressing molding is 1000-3000 MPa.

3. The method for preparing the metal soft magnetic powder core according to claim 1, characterized in that: In the step S2, the exciting force of the spectrum vibration aging is 5 to 25 KN; And / or, the speed regulation range of the spectrum vibration aging is 500-6000r / min, and the steady speed accuracy is ±1r / min; And / or, the frequency spectrum vibration aging time is 30 to 240 minutes.

4. The method for preparing the metal soft magnetic powder core according to claim 1, characterized in that: In the step S1, the particle size of the metal soft magnetic powder is 200-1000 meshes.

5. The method for preparing the metal soft magnetic powder core according to claim 1, characterized in that: In the step S1, the material of the metal soft magnetic powder includes at least one of sendustine, iron-nickel, iron-silicon, iron-nickel-molybdenum, and amorphous nanocrystals.

6. The method for preparing the metal soft magnetic powder core according to claim 1, characterized in that: In the step S1, the material of the coating used in the insulation coating process includes at least one of an acidic substance, an inorganic insulating agent, and a silicone resin; Preferably, the acidic substance includes at least one of phosphoric acid, oxalic acid and boric acid, preferably phosphoric acid; Preferably, the inorganic insulating agent includes at least one of silicon oxide, aluminum oxide, magnesium oxide, kaolin, mica powder and diatomaceous earth.

7. The method for preparing the metal soft magnetic powder core according to claim 6, characterized in that: The material of the coating includes the acidic substance, the inorganic insulating agent and the silicone resin. Based on the metal soft magnetic powder, the mass content of the acidic substance is 0.1-0.6%, the mass content of the inorganic insulating agent is 1-1.5%, and the mass content of the silicone resin is 0.1-0.6%.

8. The method for preparing the metal soft magnetic powder core according to claim 1, characterized in that: In the step S1, at least one of an adhesive and a release agent is added during the compression molding process; Preferably, the adhesive comprises at least one of polyvinyl alcohol, polyurethane, epoxy resin, and polyacrylate, and the mass ratio of the adhesive to the metal soft magnetic powder is (0.5-2.5):100; Preferably, the release agent includes at least one of zinc stearate / magnesium / aluminum, graphite, and talcum powder, and the mass ratio of the release agent to the metal soft magnetic powder is (0.1-1.5):

100.

9. A metal soft magnetic powder core, characterized in that: The metal soft magnetic powder core is prepared according to the preparation method described in any one of claims 1 to 8.

10. Application of the metal soft magnetic powder core according to claim 9 or the metal soft magnetic powder core obtained by the preparation method according to any one of claims 1 to 8 in the fields of 5G communications, consumer electronics, information technology, intelligent manufacturing, etc.

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