Insulation-coated soft magnetic material, manufacturing method therefor, manufacturing method for soft magnetic composite, and soft magnetic composite manufactured thereby

Abstract

The present invention relates to an insulation-coated soft magnetic material, a manufacturing method therefor, a manufacturing method for a soft magnetic composite, and a soft magnetic composite manufactured thereby. The soft magnetic composite can have excellent magnetic properties

Description

Insulating coated soft magnetic material, method for producing the same, method for producing a soft magnetic composite, and soft magnetic composite produced therefrom

[0001] This invention claims the benefit of Korean Patent Application No. 10-2024-0073417 filed with the Korean Intellectual Property Office on June 5, 2024, the entire contents of which are incorporated herein by reference.

[0002] The present invention relates to an insulating-coated soft magnetic material, a method for producing the same, a method for producing a soft magnetic composite, and a soft magnetic composite produced therefrom.

[0003] The increasing capacity of power conversion devices such as inverters and converters, which are essential in the electrical, electronics, and communications industries, as well as in the electric vehicle and renewable energy industries, is driving the demand for miniaturization and lightweight inductor technology. To increase the power density and achieve miniaturization and lightweight design in power conversion devices, technologies that reduce the size of passive components such as inductors and capacitors are essential.

[0004] An inductor is one of the three major passive components that make up an electric circuit. It consists of a conductive coil (wire) wound around a core made of molded soft magnetic powder. An inductor temporarily stores energy in the form of a magnetic field within the coil, which acts to impede changes in the passing current. The size of the inductor is determined by its inductance, which is the ratio of the electromotive force to the change in current. Increasing the switching frequency is typically the key to reducing the size of an inductor, and the required inductance is inversely proportional to the switching frequency. Therefore, increasing the circuit's operating frequency allows for miniaturization of the inductor.

[0005] In addition, when the permeability (μ) is high, the number of turns of the coil wound around the soft magnetic magnet can be reduced, and the input raw materials can be reduced, thereby improving the efficiency of inductor production. Furthermore, when the coercivity of the soft magnetic magnet is low, the core loss can be low, and when the core loss of the soft magnetic magnet is low, the efficiency of the inductor can be increased.

[0006] To further enhance these magnetic properties, research on soft magnetic composites (SMCs) is being widely conducted. Soft magnetic composites can be manufactured into high-density molded bodies by compression molding iron-based soft magnetic metal powders with an insulating coating. The soft magnetic composites have the characteristic of minimizing the generation of eddy currents by containing a continuous insulating layer matrix formed by the insulating layer coated on the powder surface, thereby achieving high saturation magnetization while reducing iron loss. Furthermore, by using soft magnetic materials in powder form, it is possible to realize complex three-dimensional structural components.

[0007] Accordingly, there is a need for a soft magnetic material to improve the magnetic properties and efficiency of the soft magnetic composite.

[0008] The problem to be solved by the present invention is to provide an insulating-coated soft magnetic material for improving the magnetic properties and efficiency of a soft magnetic composite, a method for producing the same, a method for producing a soft magnetic composite, and a soft magnetic composite produced therefrom.

[0009] However, the problems to be solved by the present invention are not limited to the problems mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the description below.

[0010] According to one aspect of the present invention, there is provided an insulating coated soft magnetic material comprising: a magnetic core; and a coating layer formed on the surface of the magnetic core, the coating layer being made of a metal-coordination polymer compound including a metal and a compound represented by the following chemical formula 1:

[0011] [Chemical Formula 1]

[0012]

[0013] In the above chemical formula 1, L1 and L2 are each independently null; a straight or branched alkylene group having 1 to 10 carbon atoms; a straight or branched alkenylene group having 2 to 10 carbon atoms; or an arylene group having 6 to 10 carbon atoms.

[0014] According to another aspect of the present invention, a method for producing an insulating coated soft magnetic material is provided, comprising: preparing a mixture comprising a magnetic core and a compound represented by the following chemical formula 2; adding a metal ion solution to the mixture; and heat-treating the mixture to which the metal ion has been added to form a coating layer composed of a metal-coordination polymer compound on the surface of the magnetic core.

[0015] [Chemical Formula 2]

[0016]

[0017] In the above chemical formula 2, L1 and L2 are each independently nothing (null); a straight-chain or branched-chain alkylene group having 1 to 10 carbon atoms; a straight-chain or branched-chain alkenylene group having 2 to 10 carbon atoms; or an arylene group having 6 to 10 carbon atoms.

[0018] According to another aspect of the present invention, a method for manufacturing a soft magnetic composite is provided, comprising the steps of: press-molding the insulating-coated soft magnetic material; and heat-treating the press-molded soft magnetic material.

[0019] According to another aspect of the present invention, a soft magnetic composite manufactured by the above manufacturing method is provided, wherein the soft magnetic composite has an iron loss of 40 W / g or less.

[0020] An insulating coated soft magnetic material according to one embodiment of the present invention can be used as a raw material for a soft magnetic composite, and can provide a soft magnetic composite having high magnetic flux density and permeability and low coercive force and iron loss.

[0021] A method for manufacturing an insulating coated magnetic material according to one embodiment of the present invention can uniformly form a coating layer composed of a metal-coordination polymer compound on the surface of a magnetic core.

[0022] The effects of the present invention are not limited to the effects described above, and effects not mentioned will be clearly understood by those skilled in the art from the specification herein.

[0023] Figure 1 shows SEM images of pure iron powder, Example 1, and Comparative Example 1.

[0024] Figure 2 shows an EDS element mapping image of Example 1.

[0025] Figure 3 shows an EDS element mapping image of Comparative Example 1.

[0026] Figure 4 shows the XRD measurement results of a metal-coordination polymer compound.

[0027] Figure 5 shows an SEM image and an EDS element mapping image measured after pressure molding (before heat treatment) of the insulating coated soft magnetic material of Example 1.

[0028] Figure 6 shows an SEM image and an EDS element mapping image of the insulating coated soft magnetic material of Comparative Example 1 measured after pressure molding (before heat treatment).

[0029] Figure 7 shows the SEM image and EDS element mapping image of Example 2.

[0030] Figure 8 shows an SEM image of Comparative Example 2.

[0031] Figure 9 shows the results of measuring the magnetic flux density, coercive force, permeability, and iron loss of Example 2, Comparative Example 2, and Comparative Example 3.

[0032] When a part in this specification is said to "include" a certain component, this does not mean that it excludes other components, but rather that it may include other components, unless otherwise specifically stated.

[0033] Throughout this specification, when it is said that an element is "on" another element, this includes not only cases where the element is in contact with the other element, but also cases where another element exists between the two elements.

[0034] Throughout this specification, terms including ordinal numbers, such as "first" and "second," are used to distinguish one component from another and are not limited by the ordinal numbers. For example, within the scope of the invention, the first component may also be referred to as the second component, and similarly, the second component may be referred to as the first component.

[0035] In this specification, "alkyl group" may mean a group comprising a straight or branched chain saturated hydrocarbon group bonded to the remainder of the molecule by one bond.

[0036] Throughout this specification, "alkenyl group" may mean an unsaturated hydrocarbon group bonded to the remainder of a molecule by one bond, the group containing one or more carbon-carbon double bonds.

[0037] Throughout this specification, “aryl group” refers to a monovalent functional group derived from arene, and may be a monocyclic aryl group or a polycyclic aryl group.

[0038] Throughout this specification, “alkylene group” may mean a divalent group, i.e., a group having two bonding positions to an alkyl group.

[0039] Throughout this specification, “alkenylene group” may mean a divalent group, i.e., an alkenyl group having two bonding positions.

[0040] Throughout this specification, “arylene group” may be monocyclic or polycyclic and may mean two bonding positions to the aryl group, i.e., divalent.

[0041] Throughout this specification, “A and / or B” means “A and B, or A or B.”

[0042] Throughout this specification, the unit “parts by weight” means the weight ratio of each component.

[0043]

[0044] Hereinafter, the present invention will be described in more detail.

[0045] One embodiment of the present invention provides an insulating coated soft magnetic material comprising: a magnetic core; and a coating layer formed on the surface of the magnetic core, the coating layer comprising a metal and a metal-coordination polymer compound including a compound represented by the following chemical formula 1:

[0046] [Chemical Formula 1]

[0047]

[0048] In the above chemical formula 1, L1 and L2 are each independently null; a straight-chain or branched-chain alkylene group having 1 to 10 carbon atoms; a straight-chain or branched-chain alkenylene group having 2 to 10 carbon atoms; or an arylene group having 6 to 10 carbon atoms. Specifically, L1 and L2 may each independently be null; a straight-chain or branched-chain alkylene group having 1 to 6 carbon atoms; a straight-chain or branched-chain alkenylene group having 2 to 6 carbon atoms; or an arylene group having 6 carbon atoms. In addition, the alkylene group, the alkenylene group, and the arylene group may be unsubstituted or substituted with one or more selected from a straight-chain or branched-chain alkyl group having 1 to 6 carbon atoms, a straight-chain or branched-chain alkenyl group having 1 to 6 carbon atoms, and an aryl group having 6 to 10 carbon atoms.

[0049] According to one embodiment of the present invention, the "soft magnetic material" can be used as a material when manufacturing a soft magnet, and the insulating-coated soft magnetic material can be an insulating-coated magnetic core or an insulating-coated magnet.

[0050] According to one embodiment of the present invention, the insulating-coated soft magnetic material may have a core-shell structure. Specifically, the core may be a magnetic core, and the shell may be a coating layer made of a metal-coordination polymer compound including a metal and a compound represented by the following chemical formula 1, whereby a soft magnetic composite manufactured from the insulating-coated soft magnetic material may have high magnetic flux density and magnetic permeability, and low coercive force and iron loss.

[0051] According to one embodiment of the present invention, the magnetic core may include at least one selected from Fe, Ni, Co, Si, B, and P. Preferably, the magnetic core may include Fe, and more preferably, the magnetic core may be a pure iron-based core. By coating the above-described magnetic core with the metal-coordination polymer compound according to the present invention, the magnetic flux density and magnetic permeability of the soft magnetic composite manufactured from the insulating-coated soft magnetic material may be high, and the coercivity and iron loss may be low.

[0052] According to one embodiment of the present invention, the magnetic core may be in one or more shapes selected from powder, chip, and rod. In addition, depending on the shape of the magnetic core, the insulating-coated soft magnetic material according to the present invention may also be in one or more shapes selected from powder, chip, and rod. Preferably, the magnetic core and the insulating-coated soft magnetic material may be in powder form. Since the soft magnetic material has a powder form, unlike the top-down process for manufacturing a conventional soft magnetic composite, the shape of the soft magnetic composite can be freely controlled through a bottom-up process, and the loss of the soft magnetic material can be minimized and recycling can also be facilitated.

[0053] According to one embodiment of the present invention, the metal may be at least one selected from Y, Al, Zr, Ti, Gd, and Er. By using the aforementioned types of metals, a metal-coordination polymer compound can be easily formed, and a uniform coating layer can be formed.

[0054] According to one embodiment of the present invention, the compound represented by the above chemical formula 1 may be an isophthalic acid ion. The compound represented by the above chemical formula 1 may be a coordination polymer compound (organic ligand) of the metal-coordination polymer compound. Therefore, by using the above-described type of ionic compound, a metal-coordination polymer compound can be easily formed, and a uniform coating layer can be formed.

[0055] According to one embodiment of the present invention, the coating layer may be amorphous. Specifically, the metal-coordination polymer compound may form an amorphous coating layer by including a meta (meta, 1-3 structure) organic ligand. Therefore, while it is difficult to uniformly coat a crystalline coating layer, the coating layer according to the present invention can be uniformly formed because it is amorphous.

[0056] According to one embodiment of the present invention, the average thickness of the coating layer may be 100 nm to 700 nm. Specifically, the average thickness of the coating layer may be 100 nm to 700 nm, 100 nm to 600 nm, 100 nm to 500 nm, 250 nm to 700 nm, 250 nm to 600 nm, 250 nm to 500 nm, 400 nm to 700 nm, 400 nm to 600 nm, 400 nm to 500 nm, or 450 nm to 550 nm. When the average thickness of the coating layer is in the above-mentioned range, the magnetic properties of the soft magnetic composite manufactured with the insulating-coated soft magnetic material may be excellent.

[0057] One embodiment of the present invention provides a method for producing an insulating coated soft magnetic material, comprising the steps of: producing a mixture comprising a magnetic core and a compound represented by the following chemical formula 2; adding a metal ion solution to the mixture; and heat-treating the mixture to which the metal ion has been added to form a coating layer composed of a metal-coordination polymer compound on the surface of the magnetic core.

[0058] [Chemical Formula 2]

[0059]

[0060] In the above chemical formula 2, L1 and L2 are each independently null; a straight-chain or branched-chain alkylene group having 1 to 10 carbon atoms, a straight-chain or branched-chain alkenylene group having 2 to 10 carbon atoms, or an arylene group having 6 to 10 carbon atoms. Specifically, L1 and L2 may each independently be null; a straight-chain or branched-chain alkylene group having 1 to 6 carbon atoms, a straight-chain or branched-chain alkenylene group having 2 to 6 carbon atoms, or an arylene group having 6 carbon atoms. In addition, the alkylene group, the alkenylene group, and the arylene group may be unsubstituted or substituted with one or more selected from a straight-chain or branched-chain alkyl group having 1 to 6 carbon atoms, a straight-chain or branched-chain alkenyl group having 1 to 6 carbon atoms, and an aryl group having 6 to 10 carbon atoms.

[0061] According to one embodiment of the present invention, the metal ion may be one or more ions selected from yttrium (Y), aluminum (Al), zirconium (Zr), titanium (Ti), gadolinium (Gd), and erbium (Er). By using the above-described types of metal ions, a metal-coordination polymer compound can be easily formed, and a uniform coating layer can be formed.

[0062] According to one embodiment of the present invention, the compound represented by the above chemical formula 2 may be isophthalic acid. The compound represented by the above chemical formula 2 may be ionized to become a coordination polymer compound (organic ligand) of the metal-coordination polymer compound. Therefore, by using the above-described type of compound, a metal-coordination polymer compound can be easily formed, and a uniform coating layer can be formed.

[0063] According to one embodiment of the present invention, the heat treatment may be performed at a temperature of 120°C to 160°C for 10 to 120 minutes. Specifically, the heat treatment temperature may be 120°C to 160°C, 120°C to 150°C, 120°C to 145°C, 130°C to 160°C, 130°C to 150°C, 130°C to 145°C, 135°C to 160°C, 135°C to 150°C, 130°C to 145°C, 135°C to 160°C, 135°C to 150°C or 135°C to 145°C, and the heat treatment time may be 10 minutes to 120 minutes, 10 minutes to 90 minutes, 10 minutes to 60 minutes, 30 minutes to 120 minutes, 30 minutes to 90 minutes or 30 minutes to 60 minutes. When the heat treatment temperature and time are within the above-mentioned ranges, a metal-coordination polymer compound can be easily formed to uniformly form a coating layer.

[0064] According to one embodiment of the present invention, before the step of heat-treating the mixture to which the metal ions have been added to form a coating layer composed of a metal-coordination polymer compound on the surface of the magnetic core, the method may further include a step of ultrasonicating the mixture to which the metal ions have been added. By performing the ultrasonic treatment, the coating layer can be formed uniformly.

[0065] One embodiment of the present invention provides a method for manufacturing a soft magnetic composite, comprising the steps of: press-molding an insulating-coated soft magnetic material; and heat-treating the press-molded soft magnetic material.

[0066] According to one embodiment of the present invention, by heat-treating the press-formed soft magnetic material, the metal-coordination polymer compound of the coating layer can be converted into a metal oxide. Accordingly, the coating layer (insulating layer) formed of the metal-coordination polymer compound can become a coating layer (insulating layer) formed of a metal oxide.

[0067] According to one embodiment of the present invention, the coating layer (insulating layer) of the soft magnetic composite may be 50 nm to 500 nm, 50 nm to 350 nm, 50 nm to 200 nm, 100 nm to 500 nm, 100 nm to 400 nm, or 100 nm to 200 nm, and since the coating layer (insulating layer) of the soft magnetic composite is uniform, the magnetic properties of the soft magnetic composite may be excellent.

[0068] According to one embodiment of the present invention, the heat treatment may be performed at a temperature of 600°C to 900°C for 10 to 120 minutes. Specifically, the heat treatment temperature may be 600°C to 900°C, 600°C to 850°C, 600°C to 800°C, 600°C to 750°C, 600°C to 700°C, or 600°C to 650°C, and the heat treatment time may be 10 to 120 minutes, 10 to 90 minutes, 10 to 60 minutes, 30 to 120 minutes, 30 to 90 minutes, 30 to 60 minutes, 45 to 120 minutes, 45 to 90 minutes, or 45 to 75 minutes. When the heat treatment temperature and time are within the above-mentioned range, a soft magnetic composite can be easily manufactured, and the magnetic properties of the manufactured soft magnetic composite can be improved.

[0069] One embodiment of the present invention is a soft magnetic composite manufactured by the above manufacturing method, wherein the soft magnetic composite may have an iron loss of 40 W / g or less. Specifically, the iron loss of the soft magnetic composite may be 40 W / g or less, more than 0 W / g and 40 W / g or less, 0.1 W / g or more and 40 W / g or less, 1 W / g or more and 40 W / g or less, 3 W / g or more and 40 W / g or less, or 5 W / g or more and 40 W / g or less. The iron loss may be measured under conditions of a magnetic field of 0.3 T and a frequency of 0.2 kHz to 1 kHz.

[0070] The matters mentioned in the insulating coated soft magnetic material, the method for producing the insulating coated soft magnetic material, the method for producing the soft magnetic composite and the soft magnetic composite of the present invention are equally applicable unless they are contradictory to each other.

[0071]

[0072] Hereinafter, the present invention will be described in detail with examples and experimental examples to specifically explain the present invention. However, the examples and experimental examples according to the present invention may be modified in various different forms, and the scope of the present invention is not construed as being limited to the examples and experimental examples described below. The examples and experimental examples in this specification are provided to more fully explain the present invention to those of average skill in the art.

[0073] Example 1. Preparation of an insulating coated magnetic material using a wet process

[0074] A mixture was prepared by adding 20 g of pure iron powder and 1 g of isophthalic acid to 0.23 L of DMF and then ultrasonicating for 10 minutes at room temperature.

[0075] A metal ion solution was prepared by dissolving 2.5 g of yttrium(Ⅲ) nitrate hexahydrate in 0.1 L of DMF.

[0076] The above mixture was heated to 120°C, and then the metal ion solution and 0.17 L of THF were added to the mixture, followed by heat treatment at 140°C for 45 minutes while stirring at 200 rpm. The powder produced by the heat treatment was washed five times with DMF and ethanol, and then vacuum-dried to obtain a soft magnetic material insulated and coated with a metal-coordination polymer compound. Here, the metal ion of the metal-coordination polymer compound is yttrium ion, and the coordination polymer compound is isophthalic acid ion.

[0077] Comparative Example 1. Manufacturing of an insulating-coated soft magnetic material using a dry process.

[0078] The same amount of metal-coordination polymer compound powder as that of the metal-coordination polymer compound of Example 1 was dry-coated on 20 g of pure iron powder using a ball milling process, thereby obtaining a soft magnetic material insulated and coated with the metal-coordination polymer compound. Here, the metal ion of the metal-coordination polymer compound is an yttrium ion, and the coordination polymer compound is an isophthalic acid ion.

[0079] Experimental Example 1. Measurement of SEM images and EDS elemental mapping images

[0080] Pure iron powder and the insulating coated soft magnetic materials of Example 1 and Comparative Example 1 were measured using a scanning electron microscope (SEM), and the results are shown in Fig. 1.

[0081] In addition, energy dispersive spectroscopy (EDS) elemental mapping images were measured using EDS, and the results are shown in Figs. 2 and 3.

[0082] Referring to Fig. 1, the SEM image of Example 1, which was insulated by a wet process, confirmed that the surface was clean. On the other hand, the SEM image of Comparative Example 1, which was insulated by a dry process, confirmed that the surface was rough and that residual metal-coordination polymer compound powder remained between the gaps between the pure iron powders. From this, it can be seen that by applying the insulated coating by a wet process, the metal-coordination polymer compound can be uniformly coated.

[0083] Referring to Figures 2 and 3, yttrium element was confirmed on the surface of the soft magnetic materials of Example 1 and Comparative Example 1. Therefore, it can be seen that metal-coordination polymer compounds were well formed on the surface of both soft magnetic materials coated with insulation by a wet process or a dry process.

[0084] Experimental Example 2. XRD Measurement of Metal-Coordination Polymer Compounds

[0085] An isophthalic acid solution was prepared by adding 1 g of isophthalic acid to 0.23 L of DMF.

[0086] 2.5 g of yttrium(Ⅲ) nitrate hexahydrate was dissolved in 0.1 L of DMF, and a metal ion solution was added.

[0087] The above metal ion solution was added to the above isophthalic acid solution, and then heat-treated at 140°C for 45 minutes while stirring at 200 rpm to prepare a metal-coordination polymer compound. Here, the metal ion of the metal-coordination polymer compound is yttrium ion, and the coordination polymer compound is isophthalic acid ion.

[0088] The above-mentioned manufactured metal-coordination polymer compound was analyzed for its XRD pattern using an XRD (X-ray Diffraction) measuring device (Rigaku D / Max-2500VL / PC) at 2θ of 5° to 50°, and the results are shown in Fig. 4.

[0089] As shown in Fig. 4, the metal-coordination polymer compound is amorphous, as no separate peak was detected in the XRD measurement.

[0090] Example 2. Preparation of a soft magnetic composite

[0091] The insulating-coated soft magnetic material of Example 1 was press-molded at a pressure of 500 MPa and then heat-treated at a temperature of 600°C for 1 hour to produce a soft magnetic composite.

[0092] Comparative Examples 2 and 3

[0093] A soft magnetic composite was manufactured in the same manner as in Example 2, except that the soft magnetic material was adjusted as shown in Table 1 below.

[0094] [Table 1]

[0095]

[0096] Experimental Example 3. Measurement of SEM images and EDS elemental mapping images

[0097] The insulating coated soft magnetic materials of Example 1 and Comparative Example 1 were each press-molded at a pressure of 500 MPa (before heat treatment), and then SEM images and EDS elemental mapping images were measured, and the results are shown in FIGS. 5 and 6.

[0098] In addition, the soft magnetic composites of Example 2 and Comparative Example 2 manufactured by heat-treating the above-mentioned pressure-molded soft magnetic material were measured by SEM images and / or EDS element mapping images, and the results are shown in FIGS. 7 and 8.

[0099] As shown in Fig. 5, it was confirmed that the insulating coated soft magnetic material of Example 1 manufactured using a wet process had a uniformly formed insulating layer after pressure molding (before heat treatment).

[0100] Referring to Figure 6, it was confirmed that the insulating-coated soft magnetic material of Comparative Example 1 manufactured using a dry process had an unevenly formed insulating layer after pressure molding (before heat treatment). In addition, referring to the arrows in Figure 6, it was confirmed that the coordination polymer compound agglomerated to form large lumps.

[0101] As shown in Fig. 7, the soft magnetic composite of Example 2, which was manufactured by pressure molding and heat treating the insulating coated soft magnetic material of Example 1 manufactured using a wet process, was confirmed to have a uniform insulating layer even after heat treatment.

[0102] Referring to Figure 8, it was confirmed that the soft magnetic composite of Comparative Example 2, which was manufactured by pressure molding and heat treating the insulating coated soft magnetic material of Comparative Example 1 manufactured using a dry process, had an uneven and partially broken insulating layer after heat treatment.

[0103] Experimental Example 4. Magnetic Characteristics Evaluation

[0104] 1) Measurement of magnetic flux density, coercive force, and permeability

[0105] The magnetic flux density, coercivity, and permeability of the soft magnetic composites of Example 2, Comparative Example 2, and Comparative Example 3 were measured under conditions of 5 kA / m, and the results are shown in Fig. 9 and Table 2.

[0106] Referring to FIG. 9 and Table 2, it was confirmed that the soft magnetic composite of Example 2, manufactured using Example 1 with an insulation coating by a wet process, had higher magnetic flux density and permeability, and lower coercive force, than the soft magnetic composite of Comparative Example 2, manufactured using Comparative Example 1 with an insulation coating by a dry process. Therefore, it can be seen that the soft magnetic composite of Example 2 has superior magnetic properties than the soft magnetic composite of Comparative Example 2.

[0107] 2) Iron loss measurement

[0108] The iron loss of the soft magnetic composites of Example 2, Comparative Example 2, and Comparative Example 3 was measured under conditions of a magnetic field of 0.3 T and a frequency range of 0.2 to 1 kHz by applying an alternating current, and the results are shown in Fig. 9 and Table 2.

[0109] [Table 2]

[0110]

[0111] As can be seen from Fig. 9 and Table 2, the soft magnetic composite of Example 2 has significantly lower iron loss than the soft magnetic composites of Comparative Examples 2 and 3, and thus has excellent magnetic properties.

[0112] Although the present invention has been described above through limited embodiments, the present invention is not limited thereto, and it is obvious that various modifications and variations are possible within the scope of the technical idea of ​​the present invention and the equivalent scope of the patent claims to be described below by a person having ordinary skill in the art to which the present invention pertains.

Claims

1. Magnetic core; and An insulating coated soft magnetic material comprising a coating layer made of a metal-coordination polymer compound including a metal and a compound represented by the following chemical formula 1 on the surface of the magnetic core: [Chemical Formula 1] In the above chemical formula 1, L1 and L2 are each independently nothing (null); a straight or branched chain alkylene group having 1 to 10 carbon atoms; a straight or branched chain alkenylene group having 2 to 10 carbon atoms; or an arylene group having 6 to 10 carbon atoms.

2. In paragraph 1, An insulating coated soft magnetic material, wherein the magnetic core comprises at least one selected from Fe, Ni, Co, Si, B and P.

3. In paragraph 1, An insulating coated soft magnetic material, wherein the magnetic core is in one or more shapes selected from powder, chips and rods.

4. In paragraph 1, An insulating coated magnetic material, wherein the metal is at least one selected from Y, Al, Zr, Ti, Gd and Er.

5. In paragraph 1, An insulating coated soft magnetic material, wherein the compound represented by the above chemical formula 1 is an isophthalic acid ion.

6. In paragraph 1, An insulating coated magnetic material, wherein the above coating layer is amorphous.

7. In paragraph 1, An insulating coated magnetic material, wherein the average thickness of the coating layer is 100 nm to 700 nm.

8. A step of preparing a mixture including a magnetic core and a compound represented by the following chemical formula 2; A step of adding a metal ion solution to the above mixture; and A method for manufacturing an insulating coated soft magnetic material, comprising: a step of heat-treating a mixture to which the metal ions are added to form a coating layer composed of a metal-coordination polymer compound on the surface of a magnetic core; [Chemical Formula 2] In the above chemical formula 2, L1 and L2 are each independently nothing (null); a straight or branched chain alkylene group having 1 to 10 carbon atoms; a straight or branched chain alkenylene group having 2 to 10 carbon atoms; or an arylene group having 6 to 10 carbon atoms.

9. In paragraph 8, A method for manufacturing an insulating coated magnetic material, wherein the above heat treatment is performed at a temperature of 120°C to 160°C for 10 to 120 minutes.

10. In paragraph 8, A method for manufacturing an insulating coated soft magnetic material, further comprising a step of ultrasonically treating the mixture to which the metal ions are added, prior to the step of heat-treating the mixture to which the metal ions are added to form a coating layer composed of a metal-coordination polymer compound on the surface of the magnetic core.

11. A step of press-forming the insulating coated magnetic material of paragraph 1; and A method for manufacturing a soft magnetic composite, comprising the step of heat-treating the above-mentioned press-formed soft magnetic material.

12. In paragraph 11, A method for producing a soft magnetic composite, wherein the above heat treatment is performed at a temperature of 600°C to 900°C for 10 to 120 minutes.

13. A soft magnetic composite manufactured by the manufacturing method of Article 11, A soft magnetic composite, wherein the iron loss of the soft magnetic composite is 40 W / g or less.

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