阅读说明：本技术 一种软磁合金复合材料及其制备方法 (Soft magnetic alloy composite material and preparation method thereof ) 是由 谈敏 郭海 聂敏 侯勤田 李有云 于 2021-08-27 设计创作，主要内容包括：本发明公开了一种软磁合金复合材料及其制备方法,所述软磁合金复合材料包括：由Fe基合金和/或羰基铁制成的球形粉末,所述球形粉末的表面具有疏水结构层并结合有金属层,还包括由聚乙烯醇树脂和/或水性丙烯酸树脂制成的树脂包覆层。所述软磁合金复合材料的制备方法为：取球形粉末状Fe基合金材料或羰基铁材料或二者的混合材料；清洗并在表面形成疏水结构层；进一步处理成流动状态粉末材料；在颗粒表面形成Cr金属层或Al金属层或Ti金属层中的至少一层；与聚乙烯醇树脂和/或水性丙烯酸树脂混合,并粉碎成混合物颗粒。实验表明,本发明的软磁合金复合材料的材料损耗优于现有技术的相关材料,而在强度方面,更是明显高于现有技术的材料。(The invention discloses a soft magnetic alloy composite material and a preparation method thereof, wherein the soft magnetic alloy composite material comprises the following components: the spherical powder is made of Fe-based alloy and/or carbonyl iron, the surface of the spherical powder is provided with a hydrophobic structure layer and is combined with a metal layer, and the spherical powder further comprises a resin coating layer made of polyvinyl alcohol resin and/or water-based acrylic resin. The preparation method of the soft magnetic alloy composite material comprises the following steps: taking a spherical powdery Fe-based alloy material or a carbonyl iron material or a mixed material of the spherical powdery Fe-based alloy material and the carbonyl iron material; cleaning and forming a hydrophobic structure layer on the surface; further processing the powder material in a fluid state; forming at least one of a Cr metal layer, an Al metal layer or a Ti metal layer on the surface of the particles; mixing with polyvinyl alcohol resin and/or water-based acrylic resin, and pulverizing into mixture particles. Experiments show that the material loss of the soft magnetic alloy composite material is superior to that of related materials in the prior art, and the strength of the soft magnetic alloy composite material is obviously superior to that of the materials in the prior art.)

1. A soft magnetic alloy composite material, wherein the soft magnetic alloy composite material is in the form of particles, comprising:

the surface of the spherical powder is provided with a hydrophobic structure layer, a PVD metal layer is combined outside the hydrophobic structure layer, and a compact oxidation film is arranged outside the PVD metal layer;

also comprises a resin coating layer made of polyvinyl alcohol resin and/or water-based acrylic resin.

2. The soft magnetic alloy composite material of claim 1, wherein the PVD metal layer is at least one of a Cr metal layer or an Al metal layer or a Ti metal layer.

3. The soft magnetic alloy composite material of claim 1, wherein the PVD metal layer is a mixed metal layer of at least two of Cr, Al, and Ti.

4. A soft magnetic alloy composite material according to claim 2 or 3, wherein the thickness of the PVD metal layer is 3-20 nm.

5. The soft magnetic alloy composite material according to claim 1, wherein the particle size of the particulate soft magnetic alloy composite material is 70 to 200um, and the particle size of the resin coating layer is 70 to 200 um.

6. The soft magnetic alloy composite material of claim 1, wherein the composition of the spherical powder material comprises at least one of FeSi, FeSiCr, FeNi, Fe, FeCo, FeSiB.

7. The soft magnetic alloy composite material according to claim 1, wherein the resin clad layer is contained in the soft magnetic alloy composite material in an amount of 0.4 to 1.0 wt%.

8. The preparation method of the soft magnetic alloy composite material is characterized by comprising the following steps:

preparing a material, namely taking a spherical powdery Fe-based alloy material or a carbonyl iron material or a mixed material of the spherical powdery Fe-based alloy material and the carbonyl iron material;

the method comprises a first treatment step, a second treatment step and a third treatment step, wherein the first treatment step is to clean the spherical powdery material and form a hydrophobic structure layer on the surface of the spherical powdery material;

a second processing step, further processing the spherical powdery material into a powder material in a flowing state;

a metal layer forming step of forming at least one of a Cr metal layer, an Al metal layer, or a Ti metal layer on the surfaces of the particles of the fluidized powder material;

and a material mixing and crushing step, wherein the flowing powder material with the metal layer formed is mixed with polyvinyl alcohol resin and/or water-based acrylic resin and crushed into mixture particles with a preset particle size.

9. The method of preparing a soft magnetic alloy composite material according to claim 7, wherein the first treatment step is washing with absolute ethanol.

10. The method of claim 7, wherein the first step of treating comprises reacting silane with hydroxyl groups on the surface of the alloy material to form the hydrophobic structure layer.

11. The method for preparing a soft magnetic alloy composite material according to claim 7, wherein the second treatment step is performed at 100-200 ℃.

12. The method of preparing a soft magnetic alloy composite material according to claim 7, wherein the step of forming the metal layer comprises: and filling at least one of an Al target material, a Ti target material or a Cr target material into the coating machine, and forming a Cr metal layer, an Al metal layer, a Ti metal layer or a mixed metal layer on the surface of the powder by a sputtering method.

Technical Field

The invention relates to the technical field of soft magnetic alloy composite materials, in particular to a soft magnetic alloy composite material and a preparation method thereof.

Background

With the development of big data, cloud computing and the internet of things, the demand of a data center for high efficiency and high power density is increasing day by day, the development of wide bandgap semiconductor power devices (GaN and SiC) and the improvement of high power density ceramic capacitor technology push power to be converted into higher efficiency and density, and therefore the requirements of higher direct current superposition resistance and lower loss are provided for an inductor. The ferrite power device has low loss, but has low direct current superposition resistance, and cannot meet the current requirements on power inductance devices. The soft magnetic alloy material has the characteristics of high Bs, high magnetic permeability, excellent current superposition, high Curie temperature and the like, so that eddy current at high frequency is reduced and the use frequency is improved by cladding the alloy material, and the requirements of high frequency and high conversion efficiency can be met to a certain extent.

Chinese patent application publication No. CN102228988A discloses a method for manufacturing a high-strength soft magnetic powder core, comprising the steps of: 1) uniformly mixing iron powder, peroxide powder and a lubricant; 2) pressing and molding the powder; 3) keeping the temperature of the blank obtained by pressing in the step 2) above the decomposition temperature of peroxide, and keeping the temperature at 300-500 ℃. According to the description, the soft magnetic powder iron core prepared by the method has high density and strength, and can greatly reduce eddy current loss, but the invention improves the oxidation degree of the material by peroxide powder to oxidize the magnetic powder to form an oxide film, and although the strength is improved, the performance is deteriorated due to the oxidation of the magnetic powder, so that the use requirement cannot be met. Chinese patent application publication No. CN110277238A discloses a soft magnetic composite material with high saturation magnetic flux density and high strength and a preparation method thereof, comprising: step 1: carrying out phosphating treatment on iron powder; step 2: washing, filtering and drying the powder, and screening to obtain coated powder; and step 3: mixing the coating powder and calcium carbonate through mechanical ball milling; and 4, step 4: pre-mixing the coated iron powder obtained in the step 3 with a lubricant; and 5: heating the mould, and adding the mixture obtained in the step (4) for compression molding; step 6: and placing the pressed magnetic ring in a vacuum sintering furnace, and carrying out nitrogen atmosphere annealing heat treatment. According to the method, the die is heated to carry out warm-pressing forming on the powder coated with the insulation, so that the friction force among the powder can be effectively reduced, and then the residual stress of the material is removed through annealing heat treatment, so that the soft magnetic composite material with high magnetic flux density and high strength can be obtained, and the use requirement under the complex stress condition is met. However, in this material, the forming density of the material is increased by mainly reducing the frictional resistance between the materials by phosphating and adding a lubricant, and the strength of the magnet is improved, but the bonding strength of the powder by the engaging force between the powders is often insufficient, and the requirement of high strength cannot be met.

The above background disclosure is only for the purpose of assisting in understanding the inventive concepts and technical solutions of the present application and does not necessarily pertain to the prior art of the present application, and should not be used to assess the novelty and inventive step of the present application in the absence of explicit evidence to suggest that such matter has been disclosed at the filing date of the present application.

Disclosure of Invention

To overcome the above-mentioned drawbacks of the prior art, the present invention provides a soft magnetic alloy composite material in the form of particles, comprising: the surface of the spherical powder is provided with a hydrophobic structure layer, a metal layer is combined outside the hydrophobic structure layer, and a dense oxide film is arranged outside the PVD (Physical Vapor Deposition) metal layer; also comprises a resin coating layer made of polyvinyl alcohol resin and/or water-based acrylic resin.

The invention may also employ the following alternatives/preferences:

the PVD metal layer is at least one of a Cr metal layer or an Al metal layer or a Ti metal layer.

The PVD metal layer is a mixed metal layer of at least two of Cr, Al and Ti.

The thickness of the PVD metal layer is 3-20 nm.

The particle size of the granular soft magnetic alloy composite material is 70-200um, and the particle size of the resin coating layer is 70-200 um.

The components of the spherical powder material comprise at least one of FeSi, FeSiCr, FeNi, Fe, FeCo and FeSiB.

The content of the resin coating layer in the soft magnetic alloy composite material is 0.4-1.0 wt%.

The invention also provides a preparation method of the soft magnetic alloy composite material, which comprises the following steps:

preparing a material, namely taking a spherical powdery Fe-based alloy material or a carbonyl iron material or a mixed material of the spherical powdery Fe-based alloy material and the carbonyl iron material;

the method comprises a first treatment step, a second treatment step and a third treatment step, wherein the first treatment step is to clean the spherical powdery material and form a hydrophobic structure layer on the surface of the spherical powdery material;

a second processing step, further processing the spherical powdery material into a powder material in a flowing state;

a metal layer forming step of forming at least one of a Cr metal layer, an Al metal layer, or a Ti metal layer on the surfaces of the particles of the fluidized powder material;

and a material mixing and crushing step, wherein the flowing powder material with the metal layer formed is mixed with polyvinyl alcohol resin and/or water-based acrylic resin and crushed into mixture particles with a preset particle size.

The preparation method of the invention can also adopt the following optional/preferred scheme:

and the first treatment step is to clean the glass by adopting absolute ethyl alcohol.

And the first treatment step is to form the hydrophobic structure layer by using silane to react with hydroxyl groups on the surface of the alloy material.

The second treatment step is carried out at the temperature of 100-200 ℃.

The step of forming the metal layer comprises the following steps: and filling at least one of an Al target material, a Ti target material or a Cr target material into the coating machine, and forming a Cr metal layer, an Al metal layer, a Ti metal layer or a mixed metal layer on the surface of the powder by a sputtering method.

The beneficial effects of the invention include:

experiments show that the material loss of the soft magnetic alloy composite material is superior to that of related materials in the prior art, and the strength of the soft magnetic alloy composite material is obviously superior to that of the materials in the prior art.

In order to overcome the weakness, inorganic insulation modification needs to be carried out on the surface of the alloy powder, so that the bonding force among material particles is improved, the insulation and pressure resistance is improved, the loss is reduced, and the strength and the weather resistance of the magnet are improved. Therefore, the design of the components and the structure of the alloy powder plays an important role in reducing the power consumption of the material and improving the strength of the magnet to develop the product, so that the development of a new high-strength low-power consumption soft magnetic material technology is necessary.

Drawings

Fig. 1 is an enlarged schematic view of a sectional structure of particles of a soft magnetic alloy composite material according to an embodiment.

FIG. 2 is a flowchart of a method for preparing a soft magnetic alloy composite material according to an embodiment.

Detailed Description

The invention will be further described with reference to the accompanying figures 1-2 and the specific embodiments. It should be emphasized that the following description is merely exemplary in nature and is not intended to limit the scope of the invention or its application. The background of the present invention may contain background information related to the problem or environment of the present invention and does not necessarily describe the prior art. Accordingly, the inclusion in the background section is not an admission of prior art by the applicant.

Example one

As shown in fig. 1, the soft magnetic alloy composite material is in the form of particles, including: spherical powder made of Fe-based alloy is called soft magnetic particles 4 below, the surfaces of the soft magnetic particles 4 are provided with hydrophobic structure layers 2, a metal layer 1 is combined outside the hydrophobic structure layers 2, and a compact oxidation film is arranged outside the PVD metal layer 1; also comprises a resin coating layer 2 made of polyvinyl alcohol resin and/or water-based acrylic resin.

The PVD metal layer 1 is at least one of a Cr metal layer, an Al metal layer, or a Ti metal layer, that is, the PVD metal layer 1 may be only one layer, or may be two or three layers, and the metals in the two or three layers may be the same or partially the same, or may be different. The thickness of the PVD metal layer 1 may be chosen within not more than 2um, preferably 3-20 nm. The particle size of the granular soft magnetic alloy composite material is 70-200um, preferably 150 um; the particle diameter of the resin coating layer 2 is 70-200um, preferably 150 um. The soft magnetic particles 4 contain at least one of FeSi, fesicrcr, FeNi, Fe, FeCo, and FeSiB, and have a particle size of D50 ═ 25 um. The content of the resin coating layer 2 in the soft magnetic alloy composite material is preferably 0.4 to 1.0 wt%.

Furthermore, the soft magnetic particles 4 may also be made of carbonyl iron, or a mixture of an Fe-based alloy and carbonyl iron. The PVD metal layer 1 may also be a mixed metal layer of at least two of Cr, Al and Ti. The particle size of the soft magnetic particles 4 may be chosen between 5-30 um. The number of the soft magnetic particles 4 in the resin coating layer 2 may be one or two or more as long as the size requirement of the particle size is satisfied.

The method for producing the soft magnetic alloy composite material of the present invention is explained in detail below.

As shown in fig. 2, is a flow chart of the preparation method of the soft magnetic alloy composite material, comprising the following steps:

preparing materials, namely taking a spherical powdery Fe-based alloy material or a carbonyl iron material or a mixed material of the spherical powdery Fe-based alloy material and the carbonyl iron material (namely soft magnetic particles);

the method comprises a first treatment step, a second treatment step and a third treatment step, wherein the first treatment step is to clean the spherical powdery material and form a hydrophobic structure layer on the surface of the spherical powdery material;

a second processing step, further processing the spherical powdery material into a powder material in a flowing state;

a metal layer forming step of forming at least one of a Cr metal layer, an Al metal layer, or a Ti metal layer on the surfaces of the particles of the fluidized powder material;

and a material mixing and crushing step, wherein the flowing powder material with the metal layer formed is mixed with polyvinyl alcohol resin and/or water-based acrylic resin and crushed into mixture particles with a preset particle size. Thereby obtaining the soft magnetic alloy composite material of the invention.

The first treatment step can be cleaning by adopting absolute ethyl alcohol, and the first treatment step can be forming the hydrophobic structure layer by reacting silane with hydroxyl groups on the surface of the alloy material. The second treatment step is carried out at the temperature of 100-200 ℃. The step of forming the metal layer comprises the following steps: and filling at least one of an Al target material, a Ti target material or a Cr target material into the coating machine, and forming a Cr metal layer, an Al metal layer, a Ti metal layer or a mixed metal layer on the surface of the powder by a sputtering method.

Example two

According to the preparation method, spherical powder is selected to be gas atomized FeSi, and the particle size of the powder is D50-25 um.

Cleaning the selected powder in absolute ethyl alcohol to remove surface impurities, and reacting silane with hydroxyl and other groups on the surface of the alloy material to form a hydrophobic structure layer.

And (3) putting the treated powder into a material loading tank of a PVD (physical vapor deposition) film plating machine, preheating to 200 ℃, and stirring by a dispersing impeller to form flowing powder. Then, a Cr target is loaded in the coating machine, and a Cr metal layer is formed on the surface of the particles in the powder by sputtering. The thickness of the Cr metal layer is 10 nm. The thickness of the Cr metal layer has great influence on the relevant performance of the product, and the excessive thickness can increase nonmagnetic substances and reduce the saturation magnetization Ms of the material, thereby causing the performance deterioration of the material, such as magnetic permeability, direct current superposition resistance and the like. The high-energy charged particles generated by the PVD coating machine impact the powder particles at a high speed through an electric field to form a thin co-permeation layer on the surface, so that ion permeation is realized, and then metal layers such as Al, Ti, Cr and the like are formed, so that the combination is tight, and the peeling is not easy. Meanwhile, elements such as Al, Ti, Cr and the like are easily formed into dense oxide films of the elements such as Al, Ti, Cr and the like by heat treatment in an oxygen atmosphere.

Then 1.0 wt% of mixed resin of polyvinyl alcohol and water-based acrylic resin is added into the treated powder, and the mixture is mixed and crushed into a granular composite material with the grain diameter of 70-200 um.

And pressing the obtained granular composite material in a mold at the temperature of 100 ℃ under the condition of 1000MPa to prepare a test sample, namely a pressed magnetic ring. The dimensions of the pressed magnetic ring are 8.0mm × 5.0mm × 2.0mm in terms of Outer Diameter (OD) × Inner Diameter (ID) × Thickness (TH).

And sintering the pressed magnetic ring by adopting an atmosphere box furnace, wherein the sintering atmosphere adopts nitrogen: and (3) hydrogen is in a volume ratio of 9:1, the heat treatment temperature is controlled at 700 ℃, the heat preservation time is 0.1h, and the pressed magnetic ring is cooled to room temperature along with the furnace after sintering.

The addition of the mixed resin mainly provides that the pressed magnetic ring has certain strength before heat treatment, and the resin is selected to have a type easy to press, otherwise, the density of the magnet cannot meet the set requirement easily. Further, the addition of the mixed resin should not be excessive, and excessive addition may deteriorate material properties due to low magnetic density caused by a large amount of residual bodies after decomposition of the resin.

EXAMPLE III

According to the preparation method, spherical powder is selected to be atomized with FeNi, and the particle size of the powder is D50-25 um.

Cleaning the selected powder in absolute ethyl alcohol to remove surface impurities, and reacting silane with hydroxyl and other groups on the surface of the alloy material to form a hydrophobic structure layer.

And (3) putting the treated powder into a material loading tank of a PVD (physical vapor deposition) film plating machine, preheating to 100 ℃, and stirring by a dispersing impeller to form flowing powder. And (3) filling an Al and Ti mixed target material into a coating machine, and sputtering the Al and Ti mixed target material on the surface of the powder to form a Al and Ti mixed metal layer, wherein the thickness of the metal layer is 20 nm.

Adding 0.4 wt% of polyvinyl alcohol into the treated powder, mixing and crushing the mixture into a composite material with 70-200um particles.

The resulting mixed powder was pressed in a mold at a temperature of 100 ℃ using 1000MPa to prepare a test sample. The dimensions of the pressed magnet ring were 8.0mm × 5.0mm × 2.0mm in terms of Outer Diameter (OD) × Inner Diameter (ID) × Thickness (TH).

Sintering the pressed magnetic ring by adopting an atmosphere box furnace, wherein the sintering atmosphere adopts nitrogen: and (3) hydrogen is in a volume ratio of 9:1, the heat treatment temperature is controlled at 700 ℃, the heat preservation time is 0.1h, and the sintered magnet ring is cooled to room temperature along with the furnace.

Example four

Selecting spherical powder water atomized FeSiCr and gas atomized FeNi mixed powder, wherein the FeSiCr is D50-6 um, the FeNi is D50-25 um, and the mass ratio of the water atomized FeSiCr to the gas atomized FeNi is 1: 9.

Cleaning the selected mixed powder in absolute ethyl alcohol to remove surface impurities, and reacting silane with hydroxyl and other groups on the surface of the alloy material to form a hydrophobic structure layer.

And putting the treated powder into a material loading tank of a PVD (physical vapor deposition) coating machine, preheating to 150 ℃, stirring by a dispersing impeller to form flowing powder, loading a Ti target material into the coating machine, and sputtering on the surface of the powder to form a Ti metal layer, wherein the thickness of the metal layer is 8 nm.

And adding 0.6 wt% of mixed resin of polyvinyl alcohol and water-based acrylic resin into the treated powder, wherein the mass ratio of the polyvinyl alcohol to the water-based acrylic resin is 7:3, and mixing and crushing the mixture into a composite material with particles of 70-200 um. The resulting mixed powder was pressed in a mold at a temperature of 100 ℃ using 1000MPa to prepare a test sample. The dimensions of the pressed magnet ring were 8.0mm × 5.0mm × 2.0mm in terms of Outer Diameter (OD) × Inner Diameter (ID) × Thickness (TH).

Sintering the pressed magnetic ring by adopting an atmosphere box furnace, wherein the sintering atmosphere adopts nitrogen: and (3) hydrogen is in a volume ratio of 9:1, the heat treatment temperature is controlled at 700 ℃, the heat preservation time is 0.1h, and the sintered magnet ring is cooled to room temperature along with the furnace.

EXAMPLE five

Selecting spherical powder gas atomization FeSi, carbonyl iron and gas atomization FeCo mixed powder, wherein the FeSi is D50-25 um, the carbonyl iron is D50-6 um, and the gas atomization FeCo is D50-11 um, and the mass ratio of the gas atomization FeSi, the carbonyl iron and the gas atomization FeCo is 7:2: 1.

Cleaning the selected powder in absolute ethyl alcohol to remove surface impurities, and reacting silane with hydroxyl and other groups on the surface of the alloy material to form a hydrophobic structure layer.

And putting the treated powder into a material loading tank of a PVD (physical vapor deposition) coating machine, preheating to 180 ℃, stirring by a dispersing impeller to form flowing powder, filling a mixed target of Al and Cr targets into the coating machine, and sputtering on the surface of the powder to form a metal layer of Cr and Al, wherein the thickness of the metal layer is 3 nm.

Adding 0.8 wt% of water-based acrylic resin into the treated powder, and mixing and crushing the mixture into a composite material with particles of 70-200 um. The resulting mixed powder was pressed in a mold at a temperature of 100 ℃ using 1000MPa to prepare a test sample. The dimensions of the pressed magnet ring were 8.0mm × 5.0mm × 2.0mm in terms of Outer Diameter (OD) × Inner Diameter (ID) × Thickness (TH).

Sintering the pressed magnetic ring by adopting an atmosphere box furnace, wherein the sintering atmosphere adopts nitrogen: and (3) hydrogen is in a volume ratio of 9:1, the heat treatment temperature is controlled at 700 ℃, the heat preservation time is 0.1h, and the sintered magnet ring is cooled to room temperature along with the furnace.

In the second to fifth embodiments, the metal layer of Al, Ti, or Cr in nm level is formed on the surface of the powder particles by controlling the material composition and the process, and can be tightly bonded by ion permeation, so that the metal layer is not easy to peel off. During the heat treatment process of the magnetic core, the surface of the particles can form a compact oxide film through the oxidation of metals such as Al, Ti or Cr, and the like, so that the magnetic core has a bonding effect and has insulating and antirust effects. By using the method, the inductance material with high strength and high reliability can be prepared.

Comparative example 1

Selecting 200g of FeSi gas atomization powder with the D50 being 25 mu m, wherein the mass percent of Fe is 95.5%, the mass percent of Si is 4.5%, adopting 0.5 wt% of phosphoric acid for phosphorization, adding 1 wt% of nano silicon oxide, adopting 0.5 wt% of silicon resin for granulation, granulating and crushing to obtain the composite material with 70-200um particles.

The resulting mixed powder was pressed in a mold at a temperature of 100 ℃ using 1000MPa to prepare a test sample. The dimensions of the pressed magnet ring were 8.0mm × 5.0mm × 2.0mm in terms of Outer Diameter (OD) × Inner Diameter (ID) × Thickness (TH).

Sintering the pressed magnetic ring by adopting an atmosphere box furnace, wherein the sintering atmosphere adopts nitrogen: and (3) hydrogen is in a volume ratio of 9:1, the heat treatment temperature is controlled at 700 ℃, the heat preservation time is 0.1h, and the sintered magnet ring is cooled to room temperature along with the furnace.

Comparative example No. two

Selecting 200g of FeNi gas atomization powder with the D50 being 25 mu m, wherein the mass percent of Fe is 50.5%, the mass percent of Ni is 49.5%, adopting 0.5 wt% of phosphoric acid for phosphorization, adding 1 wt% of nano silicon oxide, adopting 0.5 wt% of silicon resin for granulation, granulating and crushing to obtain the composite material with 70-200um particles.

The resulting mixed powder was pressed in a mold at a temperature of 100 ℃ using 1000MPa to prepare a test sample. The dimensions of the pressed magnet ring were 8.0mm × 5.0mm × 2.0mm in terms of Outer Diameter (OD) × Inner Diameter (ID) × Thickness (TH).

Sintering the pressed magnetic ring by adopting an atmosphere box furnace, wherein the sintering atmosphere adopts nitrogen: and (3) hydrogen is in a volume ratio of 9:1, the heat treatment temperature is controlled at 700 ℃, the heat preservation time is 0.1h, and the sintered magnet ring is cooled to room temperature along with the furnace.

The performance evaluation of the magnetic rings prepared and heat treated according to the above examples and two comparative examples was as follows:

the evaluation method comprises the following steps: winding turns N is 13Ts, and the initial permeability mu of the magnetic ring sample is tested by using a 3260B LCR tester_i(1V/1MHz) and the inductance under the superposed current, and testing the power consumption (50 mT) of the magnetic ring by an IWATSU-SY-8218 type hysteresis loop instrument&500kHz)。

The test data are as follows

Test items	Unit of parameter	Example 1	Example 2	Example 3	Example 4	Comparative example 1	Comparative example 2
								Magnetic permeability	-	105	110	95	113	85	87
Power consumption	kW/m3	1320	790	1620	1790	2850	1830
								Strength of	N	130	151	93	87	19	23

Conclusion analysis: as can be seen from the table one, the material loss of the soft magnetic alloy composite material prepared in each example is lower than that of the two comparative examples, and the strength of the soft magnetic alloy composite material is obviously higher than that of the comparative examples, which shows that the material composition control and the process treatment of the invention have a decisive effect on the high strength and low loss.

In addition, the following was further analyzed: al, Ti, Cr and other elements are bonded on the particle surface in a PVD mode, a compact oxide film is easily formed, the particle strength can be improved through the mutual bonding between the Al, Ti, Cr and other elements, the Al, Ti, Cr and other elements are attached on the particle surface and do not enter crystal lattices, and the crystal phase of the material is not influenced. In the prior art, elements such as Al, Ti, Cr and the like are added in a smelting mode, and can enter crystal lattices to generate partial non-magnetic phases, so that the material performance is deteriorated. Secondly, elements such as Al, Ti, Cr and the like need to be attached to the surface of particles through oxygen and the like in crystal lattices to form a certain oxidation driving force to be segregated to the surface of the material, so that the addition amount in the prior art is more, and the performance is poorer. Furthermore, in a conventional phosphating mode and the like, iron phosphate is mainly generated in phosphating, the material performance is deteriorated due to uncontrollable thickness, and iron phosphate cannot be bonded with particles, so that the material performance is difficult to optimize.

The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several equivalent substitutions or obvious modifications can be made without departing from the spirit of the invention, and all the properties or uses are considered to be within the scope of the invention.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "preferred embodiments," "an example," "a specific example," or "some examples" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Various embodiments or examples and features of various embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction. Although embodiments of the present invention and their advantages have been described in detail, it should be understood that various changes, substitutions and alterations can be made herein without departing from the scope of the claims.