阅读说明：本技术 一种铁钴基纳米晶软磁合金磁芯材料及其制备方法 (Iron-cobalt-based nanocrystalline magnetically soft alloy magnetic core material and preparation method thereof ) 是由 邓毕力 罗顶飞 潘振海 王玉川 徐敏义 于 2020-12-21 设计创作，主要内容包括：本发明提供一种铁钴基纳米晶软磁合金磁芯材料及其制备方法,所述材料按重量组分计,包括以下成分：分子式为Fe-aSi-bM-cB-dCr的纳米晶纳米粉末60份～80份,其中a+b+c+d＝99,所述M元素为Cd、Ce、Nb、Cu中的一种或几种,65≤a≤75,15≤b≤25,6≤c≤10,1≤d≤3；纳米金属氧化物粉末20份～35份；纳米SiO-2粉末15份～20份；正硅酸乙酯10份～15份；石墨烯20份～25份；环氧树脂30份～40份；脂肪酸聚氧乙烯酯5份～10份；环己烷20份～25份；正丙醇15份～18份。本发明提供磁芯材料具有高饱和磁化强度,高介电常数、低磁损率和高矫顽力等优异的软磁合金性能。(The invention provides an iron-cobalt-based nanocrystalline magnetically soft alloy magnetic core material and a preparation method thereof, wherein the material comprises the following components in parts by weight: molecular formula of Fe a Si b M c B d 60-80 parts of Cr nanocrystalline nano powder, wherein a + b + c + d is 99, the M element is one or more of Cd, Ce, Nb and Cu, a is more than or equal to 65 and less than or equal to 75, b is more than or equal to 15 and less than or equal to 25, c is more than or equal to 6 and less than or equal to 10, and d is more than or equal to 1 and less than or equal to 3; 20-35 parts of nano metal oxide powder; nano SiO 2 15-20 parts of powder; 10-15 parts of ethyl orthosilicate; 20-25 parts of graphene; epoxy resin 3040-40 parts of a solvent; 5-10 parts of fatty acid polyoxyethylene ester; 20-25 parts of cyclohexane; 15-18 parts of n-propanol. The present invention provides a magnetic core material having excellent soft magnetic alloy properties such as high saturation magnetization, high dielectric constant, low magnetic loss rate, and high coercive force.)

1. An iron-cobalt-based nanocrystalline magnetically soft alloy magnetic core material is characterized by comprising the following components in parts by weight:

molecular formula of Fe_aSi_bM_cB_d60-80 parts of Cr nanocrystalline nano powder, wherein a + b + c + d is 99, the M element is one or more of Cd, Ce, Nb and Cu, a is more than or equal to 65 and less than or equal to 75, b is more than or equal to 15 and less than or equal to 25, c is more than or equal to 6 and less than or equal to 10, and d is more than or equal to 1 and less than or equal to 3;

2. the iron-cobalt-based nanocrystalline magnetically soft alloy magnetic core material according to claim 1, wherein the formula is Fe_aSi_bM_cB_dThe grain diameter of the Cr nanocrystalline nano powder is 450-550 meshes.

3. The iron-cobalt-based nanocrystalline magnetically soft alloy magnetic core material according to claim 1, wherein the grain size of the nano metal oxide is 20nm to 50 nm.

4. The Fe-Co based nanocrystalline magnetically soft alloy magnetic core material according to claim 1, wherein the nano metal oxide is nano Al₂O₃Nano Fe₂O₃Nano Fe₃O₄Nano ZnO or nano TiO₂One or more of them.

5. The iron-cobalt based nanocrystalline magnetically soft alloy magnetic core material according to claim 1, wherein the epoxy resin is one or more of epoxy resin 616, epoxy resin 6101, epoxy resin 601, epoxy resin 634, or epoxy resin 618.

6. A method for preparing an iron-cobalt based nanocrystalline magnetically soft alloy magnetic core material according to any one of claims 1 to 5, characterized by comprising the steps of:

s1: according to said formula Fe_aSi_bM_cB_dIron-cobalt based nanocrystalline magnetically soft alloy magnetic core of CrThe components are proportioned, the proportioned mixture is smelted into molten steel, the temperature of the molten steel is adjusted to 180-350 ℃, and the liquid level height of the molten steel is 700-800 mm; adopting a single copper roller to carry out spraying and rapid quenching at the speed of 25-35 m/s to cool the molten steel to obtain the Fe-Co-based nanocrystalline alloy thin strip, wherein the distance between a spray nozzle used for spraying and the single copper roller is 150-180 mu m; mechanically crushing the iron-cobalt-based nanocrystalline thin strip to obtain iron-cobalt-based nanocrystalline powder;

s2: mixing the fatty acid polyoxyethylene ester of the weight component, the cosurfactant n-propanol of the weight component and the cyclohexane of the weight component to obtain a micro-emulsion oil phase mixed solution;

s3: dissolving the iron-cobalt-based nanocrystalline powder obtained in the step S1 in the microemulsion oil phase mixed solution obtained in the step S2, heating at the ultrasonic frequency of 80 Hz-100 Hz and the temperature of 55-65 ℃ for 45 min-1 h, and continuously dropwise adding one half of tetraethoxysilane of the weight components in the ultrasonic heating process;

s4: adding concentrated ammonia water into the mixture obtained in the step S3, adjusting the pH value to be slightly alkaline, and then adding the nanometer metal oxide powder and the nanometer SiO of the weight components₂The powder is doped to obtain nano metal oxide/SiO₂Doping iron-cobalt-based nanocrystalline precursor solution, and drying in vacuum in nitrogen atmosphere to obtain nano metal oxide/SiO₂Doping iron-cobalt-based nanocrystalline powder;

s5: uniformly mixing the graphene with the weight component and the epoxy resin with the weight component, and continuously dropwise adding the remaining half of the tetraethoxysilane with the weight component in the mixing process to obtain an epoxy resin solution doped with graphene;

s6: the nano metal oxide/SiO obtained in the step S4₂Mixing the iron-cobalt-doped nanocrystalline powder with the graphene-doped epoxy resin solution obtained in the step S5, centrifuging at the rotation speed of 5000rpm after adopting 100-200 rpm, taking the precipitate after centrifugation, alternately cleaning for 3-5 times by adopting ethanol and distilled water, and drying at the temperature of 60-80 ℃ to obtain the graphene-doped epoxy resin-coated nano metaloxide/SiO₂And doping the iron-cobalt-based nanocrystalline magnetically soft alloy magnetic core material.

7. The method for preparing an iron-cobalt based nanocrystalline soft magnetic alloy magnetic core material according to claim 6, wherein the step of S3 is continuously stirred at a rotation speed of 150rpm to 200rpm during the ultrasonic heating process.

8. The method for preparing an iron-cobalt-based nanocrystalline magnetically soft alloy magnetic core material according to claim 6, wherein the step of S4 is to adjust pH to slightly alkaline, namely to adjust pH to 7.5-9.

9. The method for preparing an iron-cobalt-based nanocrystalline magnetically soft alloy magnetic core material according to claim 6, wherein, in the vacuum drying process in the nitrogen atmosphere in the step of S4, the nitrogen gas flow is 10cm²/s～15cm²And/s, the vacuum degree of vacuum drying is 4.5 bar-5.5 bar.

10. The method for preparing an iron-cobalt based nanocrystalline magnetically soft alloy magnetic core material according to claim 6, wherein the graphene and the epoxy resin are mixed in the step of S5 under the conditions of stirring at a temperature of 45-55 ℃ and a rotation speed of 180-250 rpm for 30-40 min.

Technical Field

The invention belongs to the technical field of magnetic core materials, and particularly relates to an iron-cobalt-based nanocrystalline magnetically soft alloy magnetic core material and a preparation method thereof.

Background

In the twenty-first century, our society has entered the information age, and Information Technology (IT) represented by communications, computers, and networks has rapidly developed, and the information industry has become the largest industry in the world today. The electronic material taking the functional ceramic material and the novel electronic component as the core is one of the main carriers of information, and the functional material for finishing information acquisition, transmission, storage, display, processing and the like is the most active direction in the field of new materials in the twenty-first century. Particularly, after WTO is added in China, the trend that China becomes an important manufacturing and processing base of the electronic information industry in the world is increasingly obvious, and the development of the industrial base and the industrial park provides good opportunity for the development of electronic components.

Miniaturization of electronic components has been an industry hotspot. In recent years, with the increase of performance requirements of smart terminal devices such as smart phones and tablet computers, the market demands for miniaturized, thinned, high-precision and high-reliability electronic components are stronger, and with the rise of wearable devices, the demands are increasing. Therefore, a soft magnetic alloy magnetic core material with high saturation magnetization, high dielectric constant and coercive force is urgently needed in the market.

Disclosure of Invention

Aiming at the defects, the invention provides an iron-cobalt-based nanocrystalline magnetically soft alloy magnetic core material with high saturation magnetization, high dielectric constant, low magnetic loss rate and high coercivity and a preparation method thereof.

The invention provides the following technical scheme: an iron-cobalt-based nanocrystalline magnetically soft alloy magnetic core material comprises the following components in parts by weight:

molecular formula of Fe_aSi_bM_cB_d60 to 80 parts of Cr nanocrystalline nano powder, wherein a + b + c + d is 99, the M element is one or more of Cd, Ce, Nb and Cu, a is more than or equal to 65 and less than or equal to 75, b is more than or equal to 15 and less than or equal to 25, c is more than or equal to 6 and less than or equal to 10, and 1≤d≤3；

Further, the molecular formula is Fe_aSi_bM_cB_dThe grain diameter of the Cr nanocrystalline nano powder is 450-550 meshes.

Further, the particle size of the nano metal oxide is 20 nm-50 nm.

Further, the nano SiO₂The particle size of the powder is 35 nm-70 nm.

Further, the nano metal oxide is nano Al₂O₃Nano Fe₂O₃Nano Fe₃O₄Nano ZnO or nano TiO₂One or more of them.

Further, the epoxy resin is one or more of epoxy resin 616, epoxy resin 6101, epoxy resin 601, epoxy resin 634, or epoxy resin 618.

The invention also provides a preparation method of the iron-cobalt-based nanocrystalline magnetically soft alloy magnetic core material, which comprises the following steps:

s1: according to said formula Fe_aSi_bM_cB_dPreparing Cr iron-cobalt-based nanocrystalline magnetically soft alloy magnetic core components, smelting the prepared mixture into molten steel, and adjusting the temperature of the molten steel to 180-350 ℃ to ensure that the liquid level height of the molten steel is 700-800 mm; adopting a single copper roller to carry out spraying and rapid quenching at the speed of 25-35 m/s to cool the molten steel to obtain the Fe-Co-based nanocrystalline alloy thin strip, wherein the distance between a spray nozzle used for spraying and the single copper roller is 150-180 mu m; mechanically crushing the iron-cobalt-based nanocrystalline thin strip to obtain iron-cobalt-based nanocrystalline powder;

s2: mixing the fatty acid polyoxyethylene ester of the weight component, the cosurfactant n-propanol of the weight component and the cyclohexane of the weight component to obtain a micro-emulsion oil phase mixed solution;

s3: dissolving the iron-cobalt-based nanocrystalline powder obtained in the step S1 in the microemulsion oil phase mixed solution obtained in the step S2, heating at the ultrasonic frequency of 80 Hz-100 Hz and the temperature of 55-65 ℃ for 45 min-1 h, and continuously dropwise adding one half of tetraethoxysilane of the weight components in the ultrasonic heating process;

s4: adding concentrated ammonia water into the mixture obtained in the step S3, adjusting the pH value to be slightly alkaline, and then adding the nanometer metal oxide powder and the nanometer SiO of the weight components₂The powder is doped to obtain nano metal oxide/SiO₂Doping iron-cobalt-based nanocrystalline precursor solution, and drying in vacuum in nitrogen atmosphere to obtain nano metal oxide/SiO₂Doping iron-cobalt-based nanocrystalline powder;

s5: uniformly mixing the graphene with the weight component and the epoxy resin with the weight component, and continuously dropwise adding the remaining half of the tetraethoxysilane with the weight component in the mixing process to obtain an epoxy resin solution doped with graphene;

s6: the nano metal oxide/SiO obtained in the step S4₂Mixing the iron-cobalt-doped nanocrystalline powder with the graphene-doped epoxy resin solution obtained in the step S5, centrifuging at the rotation speed of 5000rpm after adopting 100-200 rpm, taking the precipitate after centrifugation, alternately cleaning for 3-5 times by adopting ethanol and distilled water, and drying at the temperature of 60-80 ℃ to obtain the graphene-doped epoxy resin-coated nano metal oxide/SiO₂And doping the iron-cobalt-based nanocrystalline magnetically soft alloy magnetic core material.

Further, the step S3 is to continuously stir at the rotating speed of 150 rpm-200 rpm during the ultrasonic heating process.

Further, the step S4 is to adjust the pH to be slightly alkaline, namely to adjust the pH to be 7.5-9.

Further, in the vacuum drying process under the nitrogen atmosphere in the step S4, the nitrogen gas flow is 10cm²/s～15cm²And/s, the vacuum degree of vacuum drying is 4.5 bar-5.5 bar.

Further, in the step S5, the graphene and the epoxy resin are mixed under the conditions of 45 ℃ to 55 ℃ and a rotation speed of 180rpm to 250rpm, wherein the stirring time is 30min to 40 min.

The invention has the beneficial effects that:

1. molecular formula Fe prepared herein_aSi_bM_cB_dThe iron-cobalt-based nanocrystalline soft magnetic alloy magnetic core of Cr is a novel soft magnetic material with excellent magnetic performance, which is obtained by separating out alpha-Fe crystal grains with nanometer size in a nanocrystalline matrix after proper treatment on the basis of iron-based nanocrystalline alloy. Unlike traditional crystal materials, nanocrystalline soft magnetic alloys do not have grain boundaries, and residual nanocrystalline matrixes exist among grains. These nano-sized α -Fe grains are uniformly distributed in the nanocrystalline matrix and well coupled together with the nanocrystalline matrix, so that the iron-based nanocrystalline alloy has excellent soft magnetic properties of high coercivity and low dielectric loss.

2. Because the nano metal oxide and the nano SiO2 are added into the soft magnetic alloy magnetic core material for doping, the porosity of the soft magnetic alloy magnetic core material can be improved, the saturation magnetization intensity of the soft magnetic alloy magnetic core material is further improved, the conductivity of the soft magnetic alloy magnetic core material is further improved, and the magnetic loss rate of the soft magnetic alloy magnetic core material is further reduced.

3. In the preparation method provided by the invention, the graphene is doped in the epoxy resin to form the graphene-doped epoxy resin-coated nano metal oxide/SiO with the core-shell structure₂The iron-cobalt-based nanocrystalline magnetically soft alloy magnetic core material is doped, so that the interference of external electromagnetic signals on the conductive material of the internal magnetic core is reduced, the magnetic loss rate of the magnetic core is further reduced, and meanwhile, the conductivity of the magnetic core is not influenced due to the fact that the graphene is doped in the epoxy resin in the outer layer of the core.

Detailed description of the preferred embodiments

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

The embodiment provides an iron-cobalt-based nanocrystalline magnetically soft alloy magnetic core material, which comprises the following components in parts by weight:

wherein the molecular formula is Fe₇₅Si₁₅Cd₈B₁The grain diameter of the nano-crystalline nano-powder of Cr is 450 meshes, and the nano-Al₂O₃Has a particle diameter of 20nm and is nano SiO₂The particle size of the powder was 35nm and the epoxy resin was epoxy 616.

The embodiment also provides a preparation method of the iron-cobalt-based nanocrystalline magnetically soft alloy magnetic core material, which comprises the following steps:

s1: according to said formula Fe₇₅Si₁₅Cd₈B₁Preparing Cr iron-cobalt-based nanocrystalline magnetically soft alloy magnetic core components, smelting the prepared mixture into molten steel, and adjusting the temperature of the molten steel to 180 ℃ to ensure that the liquid level height of the molten steel is 700 mm; cooling the molten steel by adopting a single copper roller to carry out spraying and rapid quenching at the speed of 25m/s to obtain an iron-cobalt-based nanocrystalline alloy thin strip, wherein the distance between a spray nozzle used for spraying and the single copper roller is 150 mu m; mechanically crushing the Fe-Co based nanocrystalline thin strip to obtain Fe with 450 meshes₇₅Si₁₅Cd₈B₁Cr-Fe-Co-based nanocrystalline powder;

s2: mixing 5 parts of polyoxyethylene fatty acid ester, 15 parts of cosurfactant n-propanol and 20 parts of cyclohexane to obtain a micro-emulsion oil phase mixed solution;

s3: fe obtained in step S1₇₅Si₁₅Cd₈B₁Dissolving Cr-Fe-Co-based nanocrystalline powder in the microemulsion oil phase mixed solution obtained in the step S2, heating for 45min under the continuous stirring of 80Hz ultrasonic frequency, 55 ℃ and 150rpm rotating speed, and continuously dropwise adding 5 parts of tetraethoxysilane in the ultrasonic heating process;

s4: to the mixture obtained in step S3, concentrated aqueous ammonia was added to adjust the pH to 7.5, and then 20 parts of a solvent was addedNano Al₂O₃Powder and 15 parts of nano SiO₂Doping the powder to obtain nano Al₂O₃/SiO₂Doping Fe-Co based nanocrystalline precursor solution in 10cm²Vacuum drying at 4.5bar vacuum degree in nitrogen atmosphere to obtain nanometer Al₂O₃/SiO₂Doping iron-cobalt-based nanocrystalline powder;

s5: stirring 20 parts of graphene and 30 parts of epoxy resin at the temperature of 45 ℃ and the rotating speed of 180rpm for 30min, uniformly mixing, and continuously dropwise adding the rest 5 parts of tetraethoxysilane in the mixing process to obtain an epoxy resin solution doped with graphene;

s6: nano Al obtained in the step S4₂O₃/SiO₂Mixing the iron-cobalt-doped nanocrystalline powder with the graphene-doped epoxy resin solution obtained in the step S5, centrifuging at the rotating speed of 5000rpm after adopting 100rpm, taking the precipitate after centrifugation, alternately cleaning for 3 times by using ethanol and distilled water, and drying at the temperature of 60 ℃ to obtain the graphene-doped epoxy resin-coated nano Al₂O₃/SiO₂And doping the iron-cobalt-based nanocrystalline magnetically soft alloy magnetic core material.

Through tests, the saturation magnetization of the iron-cobalt-based nanocrystalline soft magnetic alloy magnetic core material provided by the embodiment is 2.13T, the magnetic loss rate is 5.36%, the dielectric loss tan delta is 0.18, and the coercive force is 6.78A/m.

Example 2

The iron-cobalt-based nanocrystalline magnetically soft alloy magnetic core material provided by the embodiment comprises the following components in parts by weight:

wherein the molecular formula is Fe₆₅Si₂₅Cu₆B₃The grain diameter of the Cr nanocrystalline nano powder is 500 meshes and is nanoFe₂O₃Has a particle diameter of 35nm and is nano SiO₂The particle size of the powder is 52.5nm, and the epoxy resin is epoxy resin 6101.

The embodiment also provides a preparation method of the iron-cobalt-based nanocrystalline magnetically soft alloy magnetic core material, which comprises the following steps:

s1: according to said formula Fe₆₅Si₂₅Cu₆B₃Preparing Cr iron-cobalt-based nanocrystalline magnetically soft alloy magnetic core components, smelting the prepared mixture into molten steel, and adjusting the temperature of the molten steel to 365 ℃ to ensure that the liquid level height of the molten steel is 750 mm; cooling the molten steel by adopting a single copper roller to carry out spraying and rapid quenching at the speed of 30m/s to obtain an iron-cobalt-based nanocrystalline alloy thin strip, wherein the distance between a spray nozzle used for spraying and the single copper roller is 165 mu m; mechanically crushing the iron-cobalt-based nanocrystalline thin strip to obtain Fe₆₅Si₂₅Cu₆B₃Cr-Fe-Co-based nanocrystalline powder;

s2: mixing 7.5 parts of polyoxyethylene fatty acid ester, 16.5 parts of cosurfactant n-propanol and 22.5 parts of cyclohexane to obtain a microemulsion oil phase mixed solution;

s3: fe obtained in step S1₆₅Si₂₅Cu₆B₃Dissolving Cr-Fe-Co-based nanocrystalline powder in the microemulsion oil phase mixed solution obtained in the step S2, continuously stirring and heating at the ultrasonic frequency of 90Hz and the rotating speed of 175rpm at the temperature of 60 ℃ for 55min, and continuously dropwise adding 6.25 parts of tetraethoxysilane in the ultrasonic heating process;

s4: adding concentrated ammonia water into the mixture obtained in the step S3, adjusting the pH value to 8.5, and then adding 27.5 parts of nano Fe₂O₃Powder and nano SiO₂Doping the powder to obtain nano Fe₂O₃/SiO₂Doping Fe-Co based nanocrystalline precursor solution at 12.5cm²Vacuum drying at 5bar vacuum degree in nitrogen atmosphere to obtain nanometer Fe₂O₃/SiO₂Doping iron-cobalt-based nanocrystalline powder;

s5: stirring 22.5 parts of graphene and 35 parts of epoxy resin at the temperature of 50 ℃ and the rotating speed of 220rpm for 35min, uniformly mixing, and continuously dropwise adding the rest 6.25 parts of tetraethoxysilane in the mixing process to obtain an epoxy resin solution doped with graphene;

s6: nano Fe obtained in the step S4₂O₃/SiO₂Mixing the iron-cobalt-doped nanocrystalline powder with the graphene-doped epoxy resin solution obtained in the step S5, centrifuging at the rotating speed of 5000rpm after 150rpm, taking the precipitate after centrifugation, alternately cleaning for 3 times by using ethanol and distilled water, and drying at 70 ℃ to obtain graphene-doped epoxy resin-coated nano Fe₂O₃/SiO₂And doping the iron-cobalt-based nanocrystalline magnetically soft alloy magnetic core material.

Through tests, the saturation magnetization of the iron-cobalt-based nanocrystalline soft magnetic alloy magnetic core material provided by the embodiment is 2.35T, the magnetic loss rate is 4.17%, the dielectric loss tan delta is 0.15, and the coercive force is 7.05A/m.

Example 3

The iron-cobalt-based nanocrystalline magnetically soft alloy magnetic core material provided by the embodiment comprises the following components in parts by weight:

wherein the molecular formula is Fe₇₀Si₁₇(Ce_0.6Nb_0.4)₁₀B₂The grain diameter of the nano-crystalline nano-powder of Cr is 550 meshes, and the nano-TiO is₂Has a particle diameter of 50nm and is nano Fe₃O₄Has a particle diameter of 20nm, a particle diameter of nano ZnO of 35nm and nano SiO₂The particle size of the powder is 70nm, and the epoxy resin is one or more of epoxy resin 618.

The embodiment also provides a preparation method of the iron-cobalt-based nanocrystalline magnetically soft alloy magnetic core material, which comprises the following steps:

s1: according to said formula Fe₇₀Si₁₇(Ce_0.6Nb_0.4)₁₀B₂Preparing Cr iron-cobalt-based nanocrystalline magnetically soft alloy magnetic core components, smelting the prepared mixture into molten steel, and adjusting the temperature of the molten steel to 350 ℃ to ensure that the liquid level height of the molten steel is 800 mm; adopting a single copper roller to carry out spraying and rapid quenching at the speed of 35m/s to cool the molten steel to obtain an iron-cobalt-based nanocrystalline alloy thin strip, wherein the distance between a spray nozzle used for spraying and the single copper roller is 180 mu m; mechanically crushing the iron-cobalt-based nanocrystalline thin strip to obtain Fe₇₀Si₁₇(Ce_0.6Nb_0.4)₁₀B₂Cr-Fe-Co-based nanocrystalline powder;

s2: mixing 10 parts of polyoxyethylene fatty acid ester, 18 parts of cosurfactant n-propanol and 25 parts of cyclohexane to obtain a micro-emulsion oil phase mixed solution;

s3: fe obtained in step S1₇₀Si₁₇(Ce_0.6Nb_0.4)₁₀B₂Dissolving Cr-Fe-Co-based nanocrystalline powder in the microemulsion oil phase mixed solution obtained in the step S2, continuously stirring and heating for 1h at 100Hz ultrasonic frequency and 65 ℃ at the rotating speed of 200rpm, and continuously dropwise adding 7.5 parts of tetraethoxysilane in the ultrasonic heating process;

s4: adding concentrated ammonia water into the mixture obtained in the step S3, adjusting the pH value to 9, and then adding 15 parts of nano ZnO powder and 10 parts of nano Fe₃O₄10 portions of nano TiO₂And 20 parts of nano SiO₂The powder is doped to obtain nano ZnO-Fe₃O₄-TiO₂/SiO₂Doping Fe-Co based nanocrystalline precursor solution at 15cm²Vacuum drying at 5.5bar vacuum degree under nitrogen atmosphere to obtain nanometer ZnO-Fe₃O₄-TiO₂/SiO₂Doping iron-cobalt-based nanocrystalline powder;

s5: stirring 25 parts of graphene and 40 parts of epoxy resin at the temperature of 55 ℃ and the rotating speed of 250rpm for 40min, uniformly mixing, and continuously dropwise adding the remaining 7.5 parts of tetraethoxysilane in the mixing process to obtain graphene-doped epoxy resin solution;

s6: nano ZnO-Fe obtained in the step of S4₃O₄-TiO₂/SiO₂Mixing the iron-cobalt-doped nanocrystalline powder with the graphene-doped epoxy resin solution obtained in the step S5, centrifuging at the rotation speed of 5000rpm after adopting 100rpm, taking the precipitate after centrifugation, alternately cleaning for 5 times by using ethanol and distilled water, and drying at 80 ℃ to obtain the graphene-doped epoxy resin-coated nano ZnO-Fe₃O₄-TiO₂/SiO₂And doping the iron-cobalt-based nanocrystalline magnetically soft alloy magnetic core material.

Through tests, the saturation magnetization of the iron-cobalt-based nanocrystalline soft magnetic alloy magnetic core material provided by the embodiment is 2.67T, the magnetic loss rate is 3.22%, the dielectric loss tan delta is 0.109, and the coercive force is 7.23A/m.

The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Furthermore, those skilled in the art will appreciate that while some embodiments herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the claims above, any of the claimed embodiments may be used in any combination. The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.