Nanocrystalline magnetic core and method for producing same

Abstract

The application provides a nanocrystalline magnetic core and a preparation method thereof, and the preparation raw material of the magnetic core comprises the following components in parts by weight: Nd2Fe 14 B magnetic powder 30-35 parts; Fe 75 CuNb2V2Si 15 B9 nanocrystalline magnetic powder 20-30 parts; hydrogenated bisphenol A type epoxy resin 15-30 parts; polypropylene 10-20 parts; hexamethylenetetramine 5-10 parts as a curing agent; triallyl isocyanurate 6-15 parts as a crosslinking agent. 75 CuNb2V2Si 15 After the annealing pretreatment of the B9 nanocrystalline magnetic powder, the ball milling and the reannealing are beneficial to improving the dispersity of the Nd2Fe 14 B magnetic powder, and further improving the anisotropy of the whole magnetic core and the magnetic permeability of the nanocrystalline magnetic core.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of magnetic core preparation, and particularly relates to a nanocrystalline magnetic core and a preparation method thereof. BACKGROUND

[0002] Due to the disorder of atomic arrangement of amorphous materials, the amorphous materials have many excellent properties with practical application values, such as good flexibility, high corrosion resistance, excellent soft magnetic characteristics and the like. With the deepening of research on amorphous materials and the continuous expansion of application directions, the amorphous materials develop rapidly, and some amorphous materials have been well applied in the fields of electronics, environmental protection, energy, electric power, military, medicine, transportation and the like. The preparation of the magnetic core in the prior art mainly includes the following steps: preparation of amorphous strip, coiling of the strip into a magnetic core, solidification of the magnetic core, heat treatment of the magnetic core, cutting of the magnetic core, and performance test. The application of the nanocrystalline magnetic core to more fields has higher requirements on the performance of the magnetic core, for example, higher magnetic permeability and inductance are required to increase the magnetic flux, but the magnetic powder for preparing the nanocrystalline magnetic core in the prior art is mostly only a single kind of magnetic powder, and the preparation method is mostly sintering, and if a solidification method is used for preparation, the solidification agent is all a common solidification agent, which is not conducive to reducing the internal stress in the preparation process of the magnetic core. SUMMARY

[0003] The application provides a nanocrystalline magnetic core and a preparation method thereof, which adopts resin solidification of multiple nanocrystalline magnetic powders, uses a special solidification agent to reduce the internal stress in the solidification process, and improves the anisotropy of the magnetic core material, thereby improving the final magnetic permeability and inductance.

[0004] The application provides the following technical scheme: a nanocrystalline magnetic core, the preparation raw material of the magnetic core comprises the following components in parts by weight:

[0005]

[0006]

[0007] Further, the particle size of the Nd2Fe 14 B magnetic powder is 60-120 mesh.

[0008] Further, the particle size of the Fe 75 CuNb2V2Si 15 B9 nanocrystalline magnetic powder comprises the following steps:

[0009] S1: Fe 75 CuNb2V2Si 15 B9 nanocrystalline strip is ball milled in a ball mill for 3-5 h after annealing and embrittlement treatment;

[0010] S2: the powder obtained in the S2 step is annealed again in an argon tube atmosphere electric resistance furnace for 0.3-0.5h to obtain the Fe 75 CuNb2V2Si 15 B9 nanometer amorphous magnetic powder.

[0011] Further, the Fe 75 CuNb2V2Si 15 The particle size of the B9 nanometer amorphous magnetic powder is 200-300 mesh.

[0012] Further, the annealing brittle temperature in the S1 step is 200-300℃.

[0013] Further, the annealing brittle time in the S1 step is 1-1.5h.

[0014] Further, the annealing brittle temperature in the S1 step is 400-600℃.

[0015] The application also provides a preparation method of the nanometer crystal magnetic core, comprising the following steps:

[0016] 1) the weight parts of hydrogenated bisphenol A type epoxy resin, the weight parts of polypropylene glycol and the weight parts of triallyl isocyanurate as a crosslinking agent are stirred uniformly at 40-60℃;

[0017] 2) the weight parts of Nd2Fe 14 B magnetic powder and the weight parts of Fe 75 CuNb2V2Si 15 The mixture obtained in the step 1) is mixed with the B9 nanometer amorphous magnetic powder, and stirred uniformly at a rotating speed of 100-200rpm, and the weight parts of hexamethylenetetramine as a curing agent is added dropwise during the stirring process;

[0018] 3) the mixture obtained in the step 2) is placed in air for 15-20min, and then placed in a vacuum drying furnace for 30min, and poured into a circular ring model;

[0019] 4) the circular ring model after pouring is crystallized and heat treated at 500-600℃ for 0.5h, and then annealed at 100-200℃ for 2h under argon atmosphere to obtain the nanometer crystal magnetic core.

[0020] Further, the size of the circular ring model is that the outer diameter is 20-25mm, the inner diameter is 10-15mm, and the thickness is 10mm.

[0021] The application has the following beneficial effects:

[0022] 1. The nanocrystalline magnetic core provided by the application adopts a curing agent composition formula of special additives, which is conducive to reducing the change rate of the magnetic performance of the core after curing.

[0023] 2. The nanocrystalline magnetic core provided by the application increases the inductance performance of the composite material by annealing the composite material after pouring during preparation, thereby improving the magnetic permeability of the nanocrystalline magnetic core and increasing the magnetic flux.

[0024] 3. The nanocrystalline magnetic core provided by the application is prepared by annealing Fe 75 CuNb2V2Si 15 B9 nanocrystalline magnetic powder, and then ball milling and annealing again, which is conducive to improving the dispersion degree of the subsequent Nd2Fe 14 B magnetic powder, thereby improving the anisotropy of the entire magnetic core and improving the magnetic permeability of the nanocrystalline magnetic core. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the application.

[0026] The reagents used in the application are all commercially available.

[0027] Embodiment 1

[0028] The nanocrystalline magnetic core provided in this embodiment is prepared from the following ingredients by weight:

[0029]

[0030] Fe 75 CuNb2V2Si 15 The preparation method of the B9 nanocrystalline magnetic powder includes the following steps:

[0031] S1: Fe 75 CuNb2V2Si 15 B9 nanocrystalline strip material is annealed at 300 DEG C for 1 h to be brittle, and then ball milled in a ball mill for 5 h to a particle size of 300 mesh;

[0032] S2: The powder obtained in the S2 step is annealed again at 600 DEG C for 0.3 h in an argon tube atmosphere electric resistance furnace to obtain Fe 75 CuNb2V2Si 15 B9 nanocrystalline magnetic powder.

[0033] The embodiment also provides a preparation method of the nanocrystalline magnetic core, and has the characteristics that the method comprises the following steps:

[0034] 1) 30 parts of hydrogenated bisphenol A type epoxy resin, 20 parts of polypropylene glycol and 15 parts of triallyl isocyanurate as a crosslinking agent are stirred uniformly at 60°C;

[0035] 2) 35 parts of Nd2Fe 14 B magnetic powder with a particle size of 120 mesh and 30 parts of Fe 75 CuNb2V2Si 15 B9 nanocrystalline magnetic powder is mixed with the mixture obtained in the step 1), and is stirred uniformly at a rotating speed of 100 rpm-200 rpm, and 10 parts of hexamethylenetetramine as a curing agent is continuously added during the stirring process;

[0036] 3) the mixture obtained in the step 2) is placed in air for 20 min, and is placed in a vacuum drying oven for 30 min, and is poured into a circular ring model with an outer diameter of 25 mm, an inner diameter of 15 mm and a thickness of 10 mm;

[0037] 4) the poured circular ring model is subjected to crystallization heat treatment at 600°C for 0.5 h, and is subjected to annealing at 200°C for 2 h in an argon atmosphere, so that a nanocrystalline magnetic core is obtained.

[0038] Through experiments, the nanocrystalline magnetic core obtained in the embodiment has a magnetic permeability of 3066 and an inductance of 0.00068 L / mH at a frequency of 100 kHz.

[0039] Embodiment 2

[0040] The nanocrystalline magnetic core provided in the embodiment has the following ingredients by weight:

[0041]

[0042]

[0043] Fe 75 CuNb2V2Si 15 B9 nanocrystalline magnetic powder

[0044] S1: Fe 75 CuNb2V2Si 15 B9 nanocrystalline strip material is annealed at 200°C for 1.5 h, and is ball milled in a ball mill for 3 h to a particle size of 200 mesh;

[0045] S2: the powder obtained in the step S2 is annealed at 400°C for 0.5 h in an argon tube atmosphere resistance furnace, so that Fe75 CuNb2V2Si 15 B9 nanometer amorphous magnetic powder.

[0046] The embodiment also provides a preparation method of the nanocrystalline magnetic core, comprising the following steps:

[0047] 1) 15 parts of hydrogenated bisphenol A type epoxy resin, 10 parts of polypropylene and 6 parts of triallyl isocyanurate as a crosslinking agent are stirred uniformly at 40°C;

[0048] 2) 30 parts of Nd2Fe 14 B magnetic powder with a particle size of 60 mesh and 20 parts of Fe 75 CuNb2V2Si 15 B9 nanometer amorphous magnetic powder is mixed with the mixture obtained in step 1), and is stirred uniformly at a rotating speed of 100 rpm, and 5 parts of hexamethylenetetramine as a curing agent is continuously added during the stirring process;

[0049] 3) The mixture obtained in step 2) is placed in air for 15 min, and is placed in a vacuum drying oven for 30 min, and is poured into a circular ring model with an outer diameter of 20 mm, an inner diameter of 10 mm and a thickness of 10 mm;

[0050] 4) The poured circular ring model is subjected to crystallization heat treatment at 500°C for 0.5 h, and is subjected to annealing at 100°C for 2 h in an argon atmosphere, to obtain the nanocrystalline magnetic core.

[0051] Through experiments, the nanocrystalline magnetic core obtained in the embodiment has a magnetic permeability of 2893 and an inductance of 0.00045 L / mH at a frequency of 100 kHz.

[0052] Embodiment 3

[0053] The embodiment provides a nanocrystalline magnetic core, and raw materials for preparing the magnetic core include the following components in parts by weight:

[0054]

[0055]

[0056] Fe 75 CuNb2V2Si 15 The preparation method of the B9 nanometer amorphous magnetic powder comprises the following steps:

[0057] S1: Fe 75 CuNb2V2Si 15 After the B9 nanometer amorphous strip is subjected to annealing and embrittlement treatment at 250°C for 1.2 h, the B9 nanometer amorphous strip is ball milled in a ball mill for 4 h to have a particle size of 250 mesh;

[0058] S2: the powder obtained in the S2 step is annealed again in an argon tube furnace at 500℃ to obtain the Fe 75 CuNb2V2Si 15 B9 nanometer amorphous magnetic powder.

[0059] The embodiment also provides a preparation method of the nanocrystalline magnetic core, comprising the following steps:

[0060] 1) 23 parts of hydrogenated bisphenol A type epoxy resin, 15 parts of polypropylene glycol and 11 parts of triallyl isocyanurate as a crosslinking agent are stirred uniformly at 50℃;

[0061] 2) 32 parts of Nd2Fe 14 B magnetic powder with a particle size of 100 mesh and 25 parts of Fe 75 CuNb2V2Si 15 B9 nanometer amorphous magnetic powder is mixed with the mixture obtained in the step 1), and is stirred uniformly at a rotating speed of 150 rpm, and 7 parts of hexamethylenetetramine as a curing agent is added dropwise during the stirring process;

[0062] 3) the mixture obtained in the step 2) is placed in air for 18 min, and is placed in a vacuum drying oven for 30 min, and is poured into a circular ring model with an outer diameter of 22 mm, an inner diameter of 13 mm and a thickness of 10 mm;

[0063] 4) the poured circular ring model is crystallized and heat treated at 550℃ for 0.5 h, and is annealed at 150℃ for 2 h under an argon atmosphere to obtain the nanocrystalline magnetic core.

[0064] Through experiments, the nanocrystalline magnetic core obtained in the embodiment has a magnetic permeability of 2928 and an inductance of 0.00057 L / mH at a frequency of 100 kHz.

[0065] The above embodiments are only used to illustrate the technical solutions of the present application, but not limit the present application; although the present application is described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions recorded in the above embodiments can be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

[0066] Furthermore, to the extent that the terms "comprises", "comprising", "includes", "including" and "has" or any variation thereof are used in the following description and / or claims, such terms are intended to include a non-exclusive inclusion. For example, a process, method, article, or apparatus that comprises a list of elements is not necessarily limited to only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. Also, where appropriate to context, the above description and / or claims can refer to actions to be taken by a person or apparatus. Such actions are sometimes referred to as being taken "by the person" or "by the apparatus". Although some embodiments have been described above with reference to specific implementation details, it is to be understood that

Claims

1. A nanocrystalline magnetic core, characterized in that, The raw material for preparing the magnetic core comprises the following components by weight: The Nd2Fe 14 The particle size of the B magnetic powder is 60-120 mesh. The Fe 75 CuNb2V2Si 15 The preparation method of B9 nanometer amorphous magnetic powder comprises the following steps: S1: Fe 75 CuNb2V2Si 15 The B9 nanocrystalline amorphous strip is ball milled in a ball mill for 3-5 h after annealing embrittlement treatment. S2: the powder obtained in the S2 step is annealed again in an argon tube atmosphere electric resistance furnace for 0.3-0.5 h to obtain the Fe 75 CuNb2V2Si 15 B9 nanometer amorphous magnetic powder; The Fe 75 CuNb2V2Si 15 The particle size of the B9 nanometer amorphous magnetic powder is 200-300 mesh. The annealing embrittlement temperature in the S1 step is 200-300℃; The annealing embrittlement time in the S1 step is 1-1.5; The annealing embrittlement temperature in the S1 step is 400-600℃.

2. The method of claim 1, wherein the nanocrystalline magnetic core is prepared by a process comprising: The method comprises the following steps: 1) stirring the hydrogenated bisphenol A type epoxy resin, the polypropylene glycol and the triallyl isocyanurate as the crosslinking agent at 40-60℃; 2) mixing the Nd2Fe 14 B magnetic powder and the weight parts of Fe 75 CuNb2V2Si 15 B9 nanocrystalline magnetic powder with the mixture obtained in step 1) and stirring until homogeneity at a speed of 100 rpm - 200 rpm, adding continuously the weight parts of hexamethyltetramine as curing agent. 3) placing the mixture obtained in the step 2) in air for 15-20 minutes, then placing it in a vacuum drying oven for 30 minutes, and pouring it into a circular ring mold; 4) crystallizing the poured circular ring mold at 500-600℃ for 0.5 hours, then annealing it at 100-200℃ for 2 hours in an argon atmosphere to obtain the nanocrystalline magnetic core.

3. The production method according to claim 2, characterized by, The size of the circular ring mold is as follows: outer diameter 20-25mm, inner diameter 10-15mm, and thickness 10mm.

Images