CN116178003A - Ferrite material, preparation method and magnetic core - Google Patents
Ferrite material, preparation method and magnetic core Download PDFInfo
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- CN116178003A CN116178003A CN202211091547.8A CN202211091547A CN116178003A CN 116178003 A CN116178003 A CN 116178003A CN 202211091547 A CN202211091547 A CN 202211091547A CN 116178003 A CN116178003 A CN 116178003A
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- 239000000463 material Substances 0.000 title claims abstract description 131
- 229910000859 α-Fe Inorganic materials 0.000 title claims abstract description 92
- 238000002360 preparation method Methods 0.000 title abstract description 8
- 239000000843 powder Substances 0.000 claims abstract description 79
- 239000011521 glass Substances 0.000 claims abstract description 62
- 239000000654 additive Substances 0.000 claims abstract description 40
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims abstract description 21
- 230000000996 additive effect Effects 0.000 claims abstract description 19
- 229910004298 SiO 2 Inorganic materials 0.000 claims abstract description 16
- 229910006404 SnO 2 Inorganic materials 0.000 claims abstract description 13
- 229910052742 iron Inorganic materials 0.000 claims abstract description 13
- 229910015902 Bi 2 O 3 Inorganic materials 0.000 claims abstract description 10
- 238000010438 heat treatment Methods 0.000 claims description 101
- 238000005245 sintering Methods 0.000 claims description 61
- 238000000498 ball milling Methods 0.000 claims description 34
- 238000001816 cooling Methods 0.000 claims description 33
- 239000002994 raw material Substances 0.000 claims description 32
- 239000011230 binding agent Substances 0.000 claims description 23
- 238000004321 preservation Methods 0.000 claims description 22
- 238000001035 drying Methods 0.000 claims description 21
- 238000002844 melting Methods 0.000 claims description 18
- 230000008018 melting Effects 0.000 claims description 18
- 238000003825 pressing Methods 0.000 claims description 16
- 229910018068 Li 2 O Inorganic materials 0.000 claims description 15
- 238000002156 mixing Methods 0.000 claims description 14
- 238000000465 moulding Methods 0.000 claims description 14
- 238000010791 quenching Methods 0.000 claims description 13
- 230000000171 quenching effect Effects 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 10
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- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 10
- 238000011156 evaluation Methods 0.000 description 10
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- 229910021641 deionized water Inorganic materials 0.000 description 5
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- 238000001000 micrograph Methods 0.000 description 4
- 229910052710 silicon Inorganic materials 0.000 description 4
- 229910001053 Nickel-zinc ferrite Inorganic materials 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 229910010293 ceramic material Inorganic materials 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000000748 compression moulding Methods 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 229910001289 Manganese-zinc ferrite Inorganic materials 0.000 description 1
- 229910018605 Ni—Zn Inorganic materials 0.000 description 1
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- C04B35/2608—Compositions containing one or more ferrites of the group comprising manganese, zinc, nickel, copper or cobalt and one or more ferrites of the group comprising rare earth metals, alkali metals, alkaline earth metals or lead
- C04B35/2616—Compositions containing one or more ferrites of the group comprising manganese, zinc, nickel, copper or cobalt and one or more ferrites of the group comprising rare earth metals, alkali metals, alkaline earth metals or lead containing lithium
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- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
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Abstract
The application provides a ferrite material, a preparation method and a magnetic core. The ferrite material comprises a main component and an additive; the main components comprise the following components in percentage by weight: 58.5 to 66.5 weight percent of Fe 2 O 3 7.5 to 18.5 weight percent of NiO,10.0 to 21.0 weight percent of ZnO and 3.0 to 7.0 weight percent of CuO; the additive comprises the following components in percentage by weight of the ferrite material: 0.2 to 1.0 weight percent of Bi 2 O 3 0.05 to 0.25 weight percent of SnO 2 Co in 0.05-0.15 wt% 2 O 3 0.1 to 0.5 weight percent of glass powder which at least comprises SiO 2 、B 2 O 3 And Al 2 O 3 . The application can improveThe mechanical property and the electromagnetic property of the ferrite material are beneficial to improving the structural strength of ferrite products.
Description
Technical Field
The application relates to the technical field of dielectric materials for inductors, in particular to the technical field of ferrite materials, and especially relates to a ferrite material, a preparation method and a magnetic core.
Background
The ferrite material mainly comprises two large series of manganese zinc ferrite material and nickel zinc ferrite material, is generally applied to the fields of computers, communication, power supplies, consumer electronic products and the like, and is a basic functional material of the electronic industry. Compared with the Mn-Zn ferrite material, the Ni-Zn ferrite material has the characteristics of high resistivity, high use frequency and the like, and is suitable for manufacturing magnetic core elements with various sizes and shapes. The strength of the existing nickel-zinc ferrite wound magnetic core product is not ideal, for example, the bending strength of a magnetic core center pillar does not meet the requirements of customers. Therefore, on the premise of not affecting the electromagnetic performance, development of a high-strength nickel-zinc ferrite material with better mechanical properties is needed.
Disclosure of Invention
In view of the above, the present application provides a ferrite material, a preparation method and a magnetic core, which improve the mechanical properties of the ferrite material, the structural strength and the electromagnetic properties of ferrite products.
The ferrite material comprises a main component and an additive;
the main components comprise the following components in percentage by weight: 58.5 to 66.5 weight percent of Fe 2 O 3 7.5 to 18.5 weight percent of NiO,10.0 to 21.0 weight percent of ZnO and 3.0 to 7.0 weight percent of CuO;
the additive comprises the following components in percentage by weight of the ferrite material: 0.2 to 1.0 weight percent of Bi 2 O 3 0.05 to 0.25 weight percent of SnO 2 Co in 0.05-0.15 wt% 2 O 3 0.1 to 0.5wt% of glass frit comprising at least SiO 2 、B 2 O 3 And Al 2 O 3 。
Optionally, the glass powder comprises the following components in percentage by weight: 35.0 to 65.0 weight percent of SiO 2 2.0 to 10.0 weight percent of B 2 O 3 1.0 to 10.0wt% of Li 2 O,1.0wt% to 10.0wt% of K 2 2.0 to 6.0 weight percent of O and Al 2 O 3 1.0 to 8.0 weight percent of CaO,0.1 to 1.0 weight percent of Fe 2 O 3 0.1 to 1.0 weight percent of NiO,0.1CuO accounting for 1.0wt percent, znO accounting for 0.1wt percent to 1.0wt percent.
Optionally, the main component comprises, in terms of purity: fe (Fe) 2 O 3 ≥99.5wt％，NiO≥99.5wt％，ZnO≥99.5wt％，CuO≥99.5wt％，Bi 2 O 3 ≥98.5wt％，SnO 2 ≥99wt％，Co 2 O 3 ≥99wt％，SiO 2 ≥99wt％，B 2 O 3 ≥99wt％，Li 2 O≥99wt％，K 2 O≥99wt％，Al 2 O 3 ≥99wt％，CaO≥99wt％。
The preparation method of the ferrite material provided by the application comprises the following steps:
s1, the configuration at least comprises SiO 2 、B 2 O 3 And Al 2 O 3 Ball milling, melting, quenching and crushing the glass powder raw material to obtain glass powder;
s2, mixing main component raw materials, and sequentially grinding, drying and presintering to obtain a main component, wherein the main component comprises the following components in percentage by weight: 58.5 to 66.5 weight percent of Fe 2 O 3 7.5 to 18.5 weight percent of NiO,10.0 to 21.0 weight percent of ZnO and 3.0 to 7.0 weight percent of CuO;
s3, mixing the glass powder, the main component and other additives, wherein the glass powder and the other additives are used as additives, and the additives comprise the following components in percentage by weight of the ferrite material: 0.2 to 1.0 weight percent of Bi 2 O 3 0.05 to 0.25 weight percent of SnO 2 Co in 0.05-0.15 wt% 2 O 3 0.1 to 0.5 weight percent of glass powder; and then granulating, press forming and sintering in sequence to obtain the ferrite material.
Optionally, in the S1:
the glass powder comprises the following raw materials in percentage by weight: 35.0 to 65.0 weight percent of SiO 2 2.0 to 10.0 weight percent of B 2 O 3 1.0 to 10.0wt% of Li 2 O,1.0wt% to 10.0wt% of K 2 O，2.0wt％About 6.0wt% Al 2 O 3 1.0 to 8.0 weight percent of CaO,0.1 to 1.0 weight percent of Fe 2 O 3 0.1 to 1.0 weight percent of NiO,0.1 to 1.0 weight percent of CuO and 0.1 to 1.0 weight percent of ZnO;
the preset melting temperature is 1400-1500 ℃ and the heat preservation time is 2-4 h; the particle size of D50 obtained by pulverization was 1.0 μm.+ -. 0.5. Mu.m.
Optionally, in the S2:
the particle size of D50 obtained by grinding is 1.0 mu m + -0.2 mu m;
the temperature of the drying is 100-200 ℃ and the time is 10-24 hours;
the presintering temperature is 830-880 ℃, the heating rate is 1-4 ℃/min, and the heat preservation time is 2-4 h.
Optionally, in the step S3:
mixing the glass powder, the main component and other additives, and then performing ball milling to obtain D50 with the granularity of 1.0 mu m plus or minus 0.2 mu m;
and adding a binder into the mixture obtained after ball milling for granulating, press forming and sintering.
Optionally, in the step of compression molding, the pressure for compression molding into a ring shape is 3T-5T, the dwell time is 2 s-5 s, the molding thickness is 3 mm-4 mm, the inner diameter is 8.5 mm-9 mm, and the outer diameter is 13 mm-15 mm; the pressure for pressing the strip is 5T-7T, the pressure maintaining time is 2 s-5 s, the molding thickness is 3 mm-4 mm, the length is 46 mm-47 mm, and the width is 4 mm-5 mm.
Optionally, in the step S3:
the sintering temperature is 1050-1200 ℃; sintering comprises the following steps:
and (3) heating: heating from room temperature to 400-500 ℃ at a heating rate of 0.3-1.0 ℃/min, and heating to 800-900 ℃ at a heating rate of 1.0-2.0 ℃/min after the binder is discharged;
and (3) a shrinkage stage: heating to 1050-1200 deg.c at the heating rate of 0.5-1.5 deg.c/min;
and (3) heat preservation: preserving heat for 1-4 h at 1050-1200 ℃;
and (3) a cooling stage: the cooling rate is 0.5-2.0 ℃/min.
The magnetic core provided by the application comprises the ferrite material or is prepared by the preparation method of the ferrite material.
As described above, the present application is achieved by designing the strict proportions of the main component and the additive, and adjusting Fe 2 O 3 The saturation magnetic induction intensity of the material is adjusted, and the use frequency of the material is adjusted by adjusting the content of NiO; the magnetic conductivity of the material is adjusted by adjusting the content of ZnO and CuO, which is beneficial to improving the electromagnetic performance of the material; adding Bi into the additive 2 O 3 、SnO 2 、Co 2 O 3 The frequency characteristic and the magnetic permeability characteristic of the material are improved; the silicon composite material contained in the additive has a lower melting point, segregates in a grain boundary, and the grain boundary contains elements such as Si, al, bi and the like to wrap crystal grains and inhibit the growth of the crystal grains, so that the crystal grains are fine and uniform in size, the grain boundary is thinner, the moving resistance of domain walls is reduced, and the electromagnetic performance can be improved; according to the common sense in the field of electronic ceramic materials, the mechanical properties are inversely proportional to the grain size, the grains are fine, the mechanical properties of the material can be improved, and the crystal structure and grain boundary distribution of the material can be further adjusted through a production process, so that the mechanical properties and electromagnetic properties of the ferrite material can be improved, and the structural strength of ferrite products can be improved.
Drawings
Fig. 1 is a schematic flow chart of a method for preparing ferrite material according to an embodiment of the present application;
FIG. 2 is a scanning electron microscope image of a cross section of a ferrite material according to an embodiment of the present application;
FIG. 3 is a scanning electron microscope image of a cross section of a conventional ferrite material;
FIG. 4 is a grain boundary microstructure of a ferrite material of an embodiment of the present application;
fig. 5 is a grain boundary microstructure diagram of a conventional ferrite material.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be clearly described below with reference to specific embodiments and corresponding drawings. It will be apparent that the embodiments described below are only some, but not all, of the embodiments of the present application. The following embodiments and technical features thereof may be combined with each other without conflict, and also belong to the technical solutions of the present application.
It should be understood that in the description of the embodiments of the present application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the technical solutions and simplifying the description of the corresponding embodiments of the present application, and do not indicate or imply that the device or element must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.
The ferrite material (which can also be formed into a material) of the embodiment of the present application includes a main component and an additive.
The main components comprise the following components in percentage by weight: 58.5 to 66.5 weight percent of Fe 2 O 3 7.5 to 18.5 weight percent of NiO,10.0 to 21.0 weight percent of ZnO and 3.0 to 7.0 weight percent of CuO;
the additive comprises the following components in percentage by weight of the ferrite material: 0.2 to 1.0 weight percent of Bi 2 O 3 0.05 to 0.25 weight percent of SnO 2 Co in 0.05-0.15 wt% 2 O 3 0.1 to 0.5 weight percent of glass powder which at least comprises SiO 2 、B 2 O 3 And Al 2 O 3 。
In the embodiment, the proportion of the main components and the additives is strictly designed, and the Fe is regulated 2 O 3 The saturation magnetic induction intensity of the material is adjusted, and the use frequency of the material is adjusted by adjusting the content of NiO; the magnetic conductivity of the material is adjusted by adjusting the content of ZnO and CuO, which is beneficial to improving the electromagnetic performance of the material; adding Bi into the additive 2 O 3 、SnO 2 、Co 2 O 3 The pole lug is used for improving the frequency characteristic and the magnetic permeability characteristic of the material; the silicon composite material contained in the additive has a lower melting point, segregates in a grain boundary, and the grain boundary contains elements such as Si, al, bi and the like to wrap crystal grains and inhibit the growth of the crystal grains, so that the crystal grains are fine and uniform in size, the grain boundary is thinner, the moving resistance of domain walls is reduced, and the electromagnetic performance can be improved; according to the common sense in the field of electronic ceramic materials, the mechanical property is inversely proportional to the grain size, and the grains are fine, so that the mechanical property of the material can be improved, and the structural strength and the electromagnetic property of ferrite products can be improved.
In one example, the glass frit further includes Li 2 O and/or K 2 O, which is formed by wrapping crystal grains with Li and/or K, and can also comprise Fe 2 O 3 NiO, cuO and ZnO, further optimizing electromagnetic properties. In some scenarios, the glass frit comprises, in weight percent: 35.0 to 65.0 weight percent of SiO 2 2.0 to 10.0 weight percent of B 2 O 3 1.0 to 10.0wt% of Li 2 O,1.0wt% to 10.0wt% of K 2 2.0 to 6.0 weight percent of O and Al 2 O 3 1.0 to 8.0 weight percent of CaO,0.1 to 1.0 weight percent of Fe 2 O 3 0.1 to 1.0 weight percent of NiO,0.1 to 1.0 weight percent of CuO and 0.1 to 1.0 weight percent of ZnO.
By adopting high-purity materials, the introduction of impurities is avoided as much as possible, and the quality of the main components and the raw materials of the additive is ensured. As an example, the purity of each raw material of the main component is: fe (Fe) 2 O 3 More than or equal to 99.5wt percent, niO more than or equal to 99.5wt percent, znO more than or equal to 99.5wt percent, and CuO more than or equal to 99.5wt percent; the purity of each raw material of the glass powder is as follows: bi (Bi) 2 O 3 ≥98.5wt％，SnO 2 ≥99wt％，Co 2 O 3 ≥99wt％，SiO 2 ≥99wt％，B 2 O 3 ≥99wt％，Li 2 O≥99wt％，K 2 O≥99wt％，Al 2 O 3 ≥99wt％，CaO≥99wt％。
The embodiment of the application also provides a preparation method of the ferrite material, as shown in fig. 1, comprising the following steps:
s1, the configuration at least comprises SiO 2 、B 2 O 3 And Al 2 O 3 And ball milling, melting, quenching and crushing the glass powder raw material to obtain the glass powder.
S2, mixing main component raw materials, and sequentially grinding, drying and presintering to obtain a main component, wherein the main component comprises the following components in percentage by weight: 58.5 to 66.5 weight percent of Fe 2 O 3 7.5 to 18.5 weight percent of NiO,10.0 to 21.0 weight percent of ZnO and 3.0 to 7.0 weight percent of CuO.
S3, mixing glass powder, a main component and other additives, wherein the glass powder and the other additives are used as additives, and the additives comprise the following components in percentage by weight of the ferrite material: 0.2 to 1.0 weight percent of Bi 2 O 3 0.05 to 0.25 weight percent of SnO 2 Co in 0.05-0.15 wt% 2 O 3 0.1 to 0.5 weight percent of glass powder; then granulating, press forming and sintering in sequence to obtain the ferrite material.
Optionally, in S1: the glass powder comprises the following raw materials in percentage by weight: 35.0 to 65.0 weight percent of SiO 2 2.0 to 10.0 weight percent of B 2 O 3 1.0 to 10.0wt% of Li 2 O,1.0wt% to 10.0wt% of K 2 2.0 to 6.0 weight percent of O and Al 2 O 3 1.0 to 8.0 weight percent of CaO,0.1 to 1.0 weight percent of Fe 2 O 3 0.1 to 1.0 weight percent of NiO,0.1 to 1.0 weight percent of CuO and 0.1 to 1.0 weight percent of ZnO; the preset melting temperature is 1400-1500 ℃ and the heat preservation time is 2-4 h; the particle size of D50 obtained by pulverization was 1.0 μm.+ -. 0.5. Mu.m.
Optionally, in S2: the particle size of D50 obtained by grinding is 1.0 mu m + -0.2 mu m; the temperature of the drying is 100-200 ℃ and the time is 10-24 hours; the presintering temperature is 830-880 ℃, the heating rate is 1-4 ℃/min, and the heat preservation time is 2-4 h.
Optionally, in S3: mixing glass powder, a main component and other additives, and performing ball milling to obtain D50 with granularity of 1.0 mu m +/-0.2 mu m; and adding a binder into the mixture obtained after ball milling for granulating, press forming and sintering.
Optionally, in S3: the sintering temperature is 1050-1200 ℃; sintering comprises the following steps:
and (3) heating: heating from room temperature to 400-500 ℃ at a heating rate of 0.3-1.0 ℃/min, and heating to 800-900 ℃ at a heating rate of 1.0-2.0 ℃/min after the binder is discharged;
and (3) a shrinkage stage: heating to 1050-1200 deg.c at the heating rate of 0.5-1.5 deg.c/min;
and (3) heat preservation: preserving heat for 1-4 h at 1050-1200 ℃;
and (3) a cooling stage: the cooling rate is 0.5-2.0 ℃/min.
Sintering directly determines the final composition, distribution of crystalline phases, grain size, compactibility, size, appearance and properties of the ferrite material and products such as magnetic cores. The sintering is to determine proper sintering temperature and sintering curve according to the sintering equipment, the pre-sintering temperature, the shrinkage of the pre-sintering material, the type and the adding proportion of the binder, the product performance requirement, the shape and the size, the blank loading weight and the mode, and the like, and the sintering comprises the steps and the parameters of the temperature, the time, and the like of each step, and the actual test proves that the electromagnetic performance of ferrite materials and products such as magnetic cores can be improved. Specifically, the heating stage is mainly the volatilization process of moisture and binder in the blank, and the temperature is slowly raised to avoid cracking of the blank, and then the blank gradually contracts, and the heating rate is proper because the sintering of the stage affects the size, uniformity, porosity, distribution and the like of the magnetic core crystal grains; after the highest sintering temperature is reached, preserving heat for 1-4 hours; in the cooling stage, the cooling rate of the product has good influence on the electromagnetic performance and the qualification rate of the product.
Through the above preferred sintering procedure, the risk of adhesion, deformation and cracking of the product is small, even none, and the consistency of the external dimension and performance of the product can meet the requirements.
In an example, taking the ferrite material as an example to manufacture the magnetic core, in the step of pressing and forming, the pressing and forming annular pressure is 3T-5T, the dwell time is 2 s-5 s, the forming thickness is 3 mm-4 mm, the inner diameter is 8.5 mm-9 mm, and the outer diameter is 13 mm-15 mm; the pressure for pressing the strip is 5T-7T, the pressure maintaining time is 2 s-5 s, the molding thickness is 3 mm-4 mm, the length is 46 mm-47 mm, and the width is 4 mm-5 mm.
This magnetic stripe sample may be tested by embodiments of the present application.
The test environment is as follows: e4991A+16454A radio frequency impedance analyzer, oven and the like test magnetic ring inductance L and Q, and calculate magnetic permeability mu i and Curie temperature Tc of the ferrite material; the saturation induction Bs is tested by adopting a SY-8218 hysteresis loop instrument; observing the microscopic morphology of the material by adopting a VEGA 3EPH scanning electron microscope; and (3) testing the mechanical property of the manufactured magnetic core by adopting a UTM6104 electronic universal testing machine, and testing the bending strength of the magnetic core by using a digital display push-pull tension meter.
Through testing, in the frequency range of 10 KHz-1 MHz, ferrite materials: the initial permeability mu i is 800+/-25%; saturated magnetic induction Bs (4000A/m) of 400+ -5% mT; the Curie temperature Tc is more than or equal to 160 ℃; the absolute value of the specific temperature coefficient alpha at 20-60 ℃ is (1.0+/-0.5) 10 < -6 >; the mechanical strength of the magnetic core pressed by the material is more than 400N, the bending strength is more than 150MPa, and the strength of the middle column of the magnetic core is more than 20N.
The present application is further illustrated by the following more specific examples.
Example 1
The main components comprise the following components in percentage by weight:
the additive comprises the following components in percentage by weight of the ferrite material:
the glass powder comprises the following components in percentage by weight:
a method of manufacturing a ferrite material comprising the steps of:
and S1, preparing special glass powder.
The manufacturing method of the glass powder comprises the following steps: melting, quenching and crushing. Weighing glass powder raw material SiO according to the formula 2 、B 2 O 3 、Li 2 O、K 2 O、Al 2 O 3 、CaO、Fe 2 O 3 NiO, cuO, znO for use; putting the weighed glass powder raw materials into a roller ball mill according to the mass ratio of the material balls of 1:4, performing mixed ball milling, pouring the mixture into a crucible after ball milling for 4 hours, putting the crucible into a melting furnace, setting the temperature to 1450 ℃, and preserving the heat for 3 hours; then pouring the melted liquid into a water tank for quenching so as to vitrify, then putting the vitrified material into a sand mill for sand milling, controlling the granularity of D50 to be 1.5 mu m plus or minus 0.5 mu m, and drying for later use.
And S2, preparing a main component.
Weighing main component raw material Fe according to a formula 2 O 3 NiO, znO, cuO for use; putting the weighed main component raw materials into a sand mill according to the following materials: ball: water mass ratio 1:3:2, adding zirconia balls with the diameter of 3mm and deionized water into a sand mill tank, wherein the rotating speed of the sand mill is 280rpm, and controlling the granularity of D50 to be 1.0 mu m plus or minus 0.2 mu m after ball milling for 6 hours to prepare slurry; drying the slurry in an oven at 150 ℃ for 14 hours; and placing the powder in a high-temperature sintering furnace for presintering at 860 ℃ at a heating rate of 2.5 ℃/min, preserving heat for 3 hours, and naturally cooling to obtain presintering powder.
And S3, preparing ferrite materials.
Weighing the prepared glass powder, main components and other additives according to a formula, placing the powder into a ball mill tank for ball milling for 3 hours, and controlling the granularity of D50 to be 1.0 mu m plus or minus 0.2 mu m to prepare slurry; and (3) drying the slurry obtained by ball milling according to the step S2 for standby.
And S4, evaluating the heat shock resistance of the ferrite material prepared in the step S3.
Adding 18wt% of binder with solid content of 10% into the powder obtained in the step S3, uniformly mixing, granulating, pressing into a ring (for electromagnetic performance evaluation), wherein the thickness is 3.5mm, the inner diameter is 8.9mm, the outer diameter is 14.7mm, the molding pressure is 4T, and the dwell time is 3S; and pressing the magnetic strip (for mechanical property evaluation) to a thickness of 3.5mm, a length of 46.3mm, a width of 4.7mm, a molding pressure of 6T, and a dwell time of 3s.
And sintering the pressed ferrite material in a high-temperature sintering furnace at a sintering temperature of 1110 ℃. Comprising the following steps:
and (3) heating: heating from room temperature to 450 ℃ at a heating rate of 0.8 ℃/min, and heating to 850 ℃ at a heating rate of 1.4 ℃/min after the binder is discharged;
and (3) a shrinkage stage: continuously heating to 1110 ℃ at the heating rate of 0.5 ℃/min;
and (3) heat preservation: preserving heat for 2h at 1110 ℃;
and (3) a cooling stage: after the baking, the temperature is reduced, and the cooling rate is 1.5 ℃/min.
Ferrite material samples prepared by the above S1 to S4 were tested in the following test environments: e4991A+16454A radio frequency impedance analyzer, oven and the like test magnetic ring inductance L and Q, and calculate magnetic permeability mu i and Curie temperature Tc of the ferrite material; the saturation induction Bs is tested by adopting a SY-8218 hysteresis loop instrument; observing the microscopic morphology of the material by adopting a VEGA 3EPH scanning electron microscope; and (3) testing the mechanical property of the manufactured magnetic core by adopting a UTM6104 electronic universal testing machine, and testing the bending strength of the magnetic core by using a digital display push-pull tension meter. The test results are shown in Table 1.
The manufacturing method for preparing the magnetic core product (such as HI magnetic core) by adopting the ferrite materials prepared in the steps of S1 to S3 further comprises the following steps:
s4, carrying out spray granulation on the powder prepared in the step S3, and manufacturing a magnetic core by dry forming;
s5, placing the magnetic core product prepared in the S4 into a high-temperature sintering furnace for sintering, wherein the sintering temperature is 1100 ℃, and preferably, the sintering comprises the following steps:
and (3) heating: slowly heating from room temperature to 450 ℃ at a heating rate of 0.8 ℃/min, preserving heat for 2 hours, continuously heating to 850 ℃ at a heating rate of 1.4 ℃/min after the binder is discharged, and preserving heat for 2 hours;
and (3) a shrinkage stage: continuously heating to 1110 ℃ at the heating rate of 1.5 ℃/min;
and (3) heat preservation: preserving heat for 2h at 1110 ℃;
and (3) a cooling stage: after the baking, the temperature is reduced, and the cooling rate is 1.5 ℃/min.
The performance of the manufactured magnetic core was evaluated, and the center pillar strength and the bending strength of the magnetic core were tested by a digital push-pull tester, and the test results are shown in table 2.
Example 2
The main components comprise the following components in percentage by weight:
the additive comprises the following components in percentage by weight of the ferrite material:
the glass powder comprises the following components in percentage by weight:
a method of manufacturing a ferrite material comprising the steps of:
and S1, preparing special glass powder.
The manufacturing method of the glass powder comprises the following steps: melting, quenching and crushing. Weighing glass powder raw material SiO according to the formula 2 、B 2 O 3 、Li 2 O、K 2 O、Al 2 O 3 、CaO、Fe 2 O 3 NiO, cuO, znO for use; putting the weighed glass powder raw materials into a roller ball mill according to the mass ratio of the material balls of 1:4, performing mixed ball milling, pouring the mixture into a crucible after ball milling for 4 hours, putting the crucible into a melting furnace, setting the temperature to 1450 ℃, and preserving the heat for 3 hours; then pouring the melted liquid into a water tank for quenching so as to vitrify, then putting the vitrified material into a sand mill for sand milling, controlling the granularity of D50 to be 1.5 mu m plus or minus 0.5 mu m, and drying for later use.
And S2, preparing a main component.
Weighing main component raw material Fe according to a formula 2 O 3 NiO, znO, cuO for use; putting the weighed main component raw materials into a sand mill according to the following materials: ball: water mass ratio 1:3:2, adding zirconia balls with the diameter of 3mm and deionized water into a sand mill tank, wherein the rotating speed of the sand mill is 300rpm, and controlling the granularity of D50 to be 1.0 mu m plus or minus 0.2 mu m after ball milling for 5 hours to prepare slurry; drying the slurry in an oven at 150 ℃ for 14 hours; and placing the powder in a high-temperature sintering furnace for presintering at 850 ℃ and a heating rate of 2.5 ℃/min, and naturally cooling after heat preservation for 3 hours to obtain presintering powder.
And S3, preparing ferrite materials.
Weighing the prepared glass powder, main components and other additives according to a formula, placing the powder into a ball mill tank for ball milling for 3 hours, and controlling the granularity of D50 to be 1.0 mu m plus or minus 0.2 mu m to prepare slurry; and (3) drying the slurry obtained by ball milling according to the step S2 for standby.
And S4, evaluating the heat shock resistance of the ferrite material prepared in the step S3.
Adding 18wt% of binder with solid content of 10% into the powder obtained in the step S3, uniformly mixing, granulating, pressing into a ring (for electromagnetic performance evaluation), wherein the thickness is 3.5mm, the inner diameter is 8.9mm, the outer diameter is 14.7mm, the molding pressure is 4T, and the dwell time is 3S; and pressing the magnetic strip (for mechanical property evaluation) to a thickness of 3.5mm, a length of 46.3mm, a width of 4.7mm, a molding pressure of 6T, and a dwell time of 3s.
And sintering the pressed ferrite material in a high-temperature sintering furnace at 1100 ℃. Comprising the following steps:
and (3) heating: heating from room temperature to 450 ℃ at a heating rate of 0.8 ℃/min, and heating to 850 ℃ at a heating rate of 1.5 ℃/min after the binder is discharged;
and (3) a shrinkage stage: continuously heating to 1100 ℃ at a heating rate of 1.0 ℃/min;
and (3) heat preservation: preserving heat for 2h at 1100 ℃;
and (3) a cooling stage: after the baking, the temperature is reduced, and the cooling rate is 1.5 ℃/min.
The ferrite material samples prepared by the above S1 to S4 were tested in the test environment as described in example 1, and the test results are shown in table 1.
The manufacturing method for preparing the magnetic core product (such as HI magnetic core) by adopting the ferrite materials prepared in the steps of S1 to S3 further comprises the following steps:
s4, carrying out spray granulation on the powder prepared in the step S3, and manufacturing a magnetic core by dry forming;
s5, placing the magnetic core product prepared in the S4 into a high-temperature sintering furnace for sintering, wherein the sintering temperature is 1100 ℃, and preferably, the sintering comprises the following steps:
and (3) heating: slowly heating from room temperature to 450 ℃ at a heating rate of 0.8 ℃/min, preserving heat for 2 hours, continuously heating to 850 ℃ at a heating rate of 1.5 ℃/min after the binder is discharged, and preserving heat for 2 hours;
and (3) a shrinkage stage: continuously heating to 1100 ℃ at a heating rate of 1.5 ℃/min;
and (3) heat preservation: preserving heat for 2h at 1100 ℃;
and (3) a cooling stage: after the baking, the temperature is reduced, and the cooling rate is 1.5 ℃/min.
The performance of the manufactured magnetic core was evaluated, and the center pillar strength and the bending strength of the magnetic core were tested by a digital push-pull tester, and the test results are shown in table 2.
Example 3
The main components comprise the following components in percentage by weight:
the additive comprises the following components in percentage by weight of the ferrite material:
the glass powder comprises the following components in percentage by weight:
a method of manufacturing a ferrite material comprising the steps of:
and S1, preparing special glass powder.
The manufacturing method of the glass powder comprises the following steps: melting, quenching and crushing. Weighing glass powder raw material SiO according to the formula 2 、B 2 O 3 、Li 2 O、K 2 O、Al 2 O 3 、CaO、Fe 2 O 3 NiO, cuO, znO for use; putting the weighed glass powder raw materials into a roller ball mill according to the mass ratio of the material balls of 1:4, performing mixed ball milling, pouring the mixture into a crucible after ball milling for 4 hours, putting the crucible into a melting furnace, setting the temperature to 1450 ℃, and preserving the heat for 3 hours; then pouring the melted liquid into a water tank for quenching so as to vitrify, then putting the vitrified material into a sand mill for sand milling, controlling the granularity of D50 to be 1.5 mu m plus or minus 0.5 mu m, and drying for later use.
And S2, preparing a main component.
Weighing main component raw material Fe according to a formula 2 O 3 NiO, znO, cuO for use; putting the weighed main component raw materials into a sand mill according to the following materials: ball: water mass ratio 1:3:2, adding zirconia balls with the diameter of 3mm and deionized water into a sand mill tank, wherein the rotating speed of the sand mill is300rpm, ball milling for 5 hours, and controlling the granularity of D50 to be 1.0 mu m plus or minus 0.2 mu m to prepare slurry; drying the slurry in an oven at 150 ℃ for 14 hours; and placing the powder in a high-temperature sintering furnace for presintering at 850 ℃ and a heating rate of 2.5 ℃/min, and naturally cooling after heat preservation for 3 hours to obtain presintering powder.
And S3, preparing ferrite materials.
Weighing the prepared glass powder, main components and other additives according to a formula, placing the powder into a ball mill tank for ball milling for 3 hours, and controlling the granularity of D50 to be 1.0 mu m plus or minus 0.2 mu m to prepare slurry; and (3) drying the slurry obtained by ball milling according to the step S2 for standby.
And S4, evaluating the heat shock resistance of the ferrite material prepared in the step S3.
Adding 18wt% of binder with solid content of 10% into the powder obtained in the step S3, uniformly mixing, granulating, pressing into a ring (for electromagnetic performance evaluation), wherein the thickness is 3.5mm, the inner diameter is 8.9mm, the outer diameter is 14.7mm, the molding pressure is 4T, and the dwell time is 3S; and pressing the magnetic strip (for mechanical property evaluation) to a thickness of 3.5mm, a length of 46.3mm, a width of 4.7mm, a molding pressure of 6T, and a dwell time of 3s.
And sintering the pressed ferrite material in a high-temperature sintering furnace at a sintering temperature of 1110 ℃. Comprising the following steps:
and (3) heating: heating from room temperature to 450 ℃ at a heating rate of 0.5 ℃/min, and heating to 850 ℃ at a heating rate of 1.3 ℃/min after the binder is discharged;
and (3) a shrinkage stage: continuously heating to 1110 ℃ at a heating rate of 1.3 ℃/min;
and (3) heat preservation: preserving heat for 2h at 1110 ℃;
and (3) a cooling stage: after the baking, the temperature is reduced, and the cooling rate is 1.5 ℃/min.
The ferrite material samples prepared by the above S1 to S4 were tested in the test environment as described in example 1, and the test results are shown in table 1.
The manufacturing method for preparing the magnetic core product (such as HI magnetic core) by adopting the ferrite materials prepared in the steps of S1 to S3 further comprises the following steps:
s4, carrying out spray granulation on the powder prepared in the step S3, and manufacturing a magnetic core by dry forming;
s5, placing the magnetic core product prepared in the S4 into a high-temperature sintering furnace for sintering, wherein the sintering temperature is 1100 ℃, and preferably, the sintering comprises the following steps:
and (3) heating: slowly heating from room temperature to 450 ℃ at a heating rate of 0.5 ℃/min, preserving heat for 2 hours, continuously heating to 850 ℃ at a heating rate of 1.3 ℃/min after the binder is discharged, and preserving heat for 2 hours;
and (3) a shrinkage stage: continuously heating to 1110 ℃ at a heating rate of 1.3 ℃/min;
and (3) heat preservation: preserving heat for 2h at 1110 ℃;
and (3) a cooling stage: after the baking, the temperature is reduced, and the cooling rate is 1.5 ℃/min.
The performance of the manufactured magnetic core was evaluated, and the center pillar strength and the bending strength of the magnetic core were tested by a digital push-pull tester, and the test results are shown in table 2.
Example 4
The main components comprise the following components in percentage by weight:
the additive comprises the following components in percentage by weight of the ferrite material:
the glass powder comprises the following components in percentage by weight:
a method of manufacturing a ferrite material comprising the steps of:
and S1, preparing special glass powder.
Glass powderThe manufacturing method of (2) comprises the following steps: melting, quenching and crushing. Weighing glass powder raw material SiO according to the formula 2 、B 2 O 3 、Li 2 O、K 2 O、Al 2 O 3 、CaO、Fe 2 O 3 NiO, cuO, znO for use; putting the weighed glass powder raw materials into a roller ball mill according to the mass ratio of the material balls of 1:4, performing mixed ball milling, pouring the mixture into a crucible after ball milling for 4 hours, putting the crucible into a melting furnace, setting the temperature to 1450 ℃, and preserving the heat for 3 hours; then pouring the melted liquid into a water tank for quenching so as to vitrify, then putting the vitrified material into a sand mill for sand milling, controlling the granularity of D50 to be 1.5 mu m plus or minus 0.5 mu m, and drying for later use.
And S2, preparing a main component.
Weighing main component raw material Fe according to a formula 2 O 3 NiO, znO, cuO for use; putting the weighed main component raw materials into a sand mill according to the following materials: ball: water mass ratio 1:3:2, adding zirconia balls with the diameter of 3mm and deionized water into a sand mill tank, wherein the rotating speed of the sand mill is 280rpm, and controlling the granularity of D50 to be 1.0 mu m plus or minus 0.2 mu m after ball milling for 6 hours to prepare slurry; drying the slurry in an oven at 150 ℃ for 14 hours; and placing the powder in a high-temperature sintering furnace for presintering at 860 ℃ at a heating rate of 2.5 ℃/min, preserving heat for 3 hours, and naturally cooling to obtain presintering powder.
And S3, preparing ferrite materials.
Weighing the prepared glass powder, main components and other additives according to a formula, placing the powder into a ball mill tank for ball milling for 3 hours, and controlling the granularity of D50 to be 1.0 mu m plus or minus 0.2 mu m to prepare slurry; and (3) drying the slurry obtained by ball milling according to the step S2 for standby.
And S4, evaluating the heat shock resistance of the ferrite material prepared in the step S3.
Adding 18wt% of binder with solid content of 10% into the powder obtained in the step S3, uniformly mixing, granulating, pressing into a ring (for electromagnetic performance evaluation), wherein the thickness is 3.5mm, the inner diameter is 8.9mm, the outer diameter is 14.7mm, the molding pressure is 4T, and the dwell time is 3S; and pressing the magnetic strip (for mechanical property evaluation) to a thickness of 3.5mm, a length of 46.3mm, a width of 4.7mm, a molding pressure of 6T, and a dwell time of 3s.
And placing the pressed ferrite material into a high-temperature sintering furnace for sintering, wherein the sintering temperature is 1130 ℃. Comprising the following steps:
and (3) heating: heating from room temperature to 450 ℃ at a heating rate of 0.6 ℃/min, and heating to 850 ℃ at a heating rate of 1.7 ℃/min after the binder is discharged;
and (3) a shrinkage stage: continuously heating to 1130 ℃ at a heating rate of 1.2 ℃/min;
and (3) heat preservation: preserving heat for 2h at 1130 ℃;
and (3) a cooling stage: after the baking, the temperature is reduced, and the cooling rate is 1.5 ℃/min.
The ferrite material samples prepared by the above S1 to S4 were tested in the test environment as described in example 1, and the test results are shown in table 1.
The manufacturing method for preparing the magnetic core product (such as HI magnetic core) by adopting the ferrite materials prepared in the steps of S1 to S3 further comprises the following steps:
s4, carrying out spray granulation on the powder prepared in the step S3, and manufacturing a magnetic core by dry forming;
s5, placing the magnetic core product prepared in the S4 into a high-temperature sintering furnace for sintering, wherein the sintering temperature is 1100 ℃, and preferably, the sintering comprises the following steps:
and (3) heating: slowly heating from room temperature to 450 ℃ at a heating rate of 0.6 ℃/min, preserving heat for 2 hours, continuously heating to 850 ℃ at a heating rate of 1.7 ℃/min after the binder is discharged, and preserving heat for 2 hours;
and (3) a shrinkage stage: continuously heating to 1130 ℃ at a heating rate of 1.5 ℃/min;
and (3) heat preservation: preserving heat for 2h at 1130 ℃;
and (3) a cooling stage: after the baking, the temperature is reduced, and the cooling rate is 1.5 ℃/min.
The performance of the manufactured magnetic core was evaluated, and the center pillar strength and the bending strength of the magnetic core were tested by a digital push-pull tester, and the test results are shown in table 2.
Example 5
The main components comprise the following components in percentage by weight:
the additive comprises the following components in percentage by weight of the ferrite material:
the glass powder comprises the following components in percentage by weight:
a method of manufacturing a ferrite material comprising the steps of:
and S1, preparing special glass powder.
The manufacturing method of the glass powder comprises the following steps: melting, quenching and crushing. Weighing glass powder raw material SiO according to the formula 2 、B 2 O 3 、Li 2 O、K 2 O、Al 2 O 3 、CaO、Fe 2 O 3 NiO, cuO, znO for use; putting the weighed glass powder raw materials into a roller ball mill according to the mass ratio of the material balls of 1:4, performing mixed ball milling, pouring the mixture into a crucible after ball milling for 4 hours, putting the crucible into a melting furnace, setting the temperature to 1460 ℃, and preserving the heat for 3 hours; then pouring the melted liquid into a water tank for quenching so as to vitrify, then putting the vitrified material into a sand mill for sand milling, controlling the granularity of D50 to be 1.5 mu m plus or minus 0.5 mu m, and drying for later use.
And S2, preparing a main component.
Weighing main component raw material Fe according to a formula 2 O 3 NiO, znO, cuO for use; putting the weighed main component raw materials into a sand mill according to the following materials: ball: water mass ratio 1:3:2, adding zirconia balls with the diameter of 3mm and deionized water into a sand mill tank, wherein the rotating speed of the sand mill is 300rpm, and controlling the granularity of D50 to be 1.0 mu m +/-0 after ball milling for 5 hours.2 μm to prepare a slurry; drying the slurry in an oven at 150 ℃ for 14 hours; and placing the powder in a high-temperature sintering furnace for presintering at 840 ℃ and a heating rate of 2.5 ℃/min, and naturally cooling after heat preservation for 3 hours to obtain presintering powder.
And S3, preparing ferrite materials.
Weighing the prepared glass powder, main components and other additives according to a formula, placing the powder into a ball mill tank for ball milling for 3 hours, and controlling the granularity of D50 to be 1.0 mu m plus or minus 0.2 mu m to prepare slurry; and (3) drying the slurry obtained by ball milling according to the step S2 for standby.
And S4, evaluating the heat shock resistance of the ferrite material prepared in the step S3.
Adding 18wt% of binder with solid content of 10% into the powder obtained in the step S3, uniformly mixing, granulating, pressing into a ring (for electromagnetic performance evaluation), wherein the thickness is 3.5mm, the inner diameter is 8.9mm, the outer diameter is 14.7mm, the molding pressure is 4T, and the dwell time is 3S; and pressing the magnetic strip (for mechanical property evaluation) to a thickness of 3.5mm, a length of 46.3mm, a width of 4.7mm, a molding pressure of 6T, and a dwell time of 3s.
And sintering the pressed ferrite material in a high-temperature sintering furnace at 1150 ℃. Comprising the following steps:
and (3) heating: heating from room temperature to 450 ℃ at a heating rate of 0.6 ℃/min, and heating to 850 ℃ at a heating rate of 1.3 ℃/min after the binder is discharged;
and (3) a shrinkage stage: continuously heating to 1150 ℃ at the heating rate of 1.0 ℃/min;
and (3) heat preservation: preserving heat for 2h at 1150 ℃;
and (3) a cooling stage: after the baking, the temperature is reduced, and the cooling rate is 1.5 ℃/min.
The ferrite material samples prepared by the above S1 to S4 were tested in the test environment as described in example 1, and the test results are shown in table 1.
The manufacturing method for preparing the magnetic core product (such as HI magnetic core) by adopting the ferrite materials prepared in the steps of S1 to S3 further comprises the following steps:
s4, carrying out spray granulation on the powder prepared in the step S3, and manufacturing a magnetic core by dry forming;
s5, placing the magnetic core product prepared in the S4 into a high-temperature sintering furnace for sintering, wherein the sintering temperature is 1100 ℃, and preferably, the sintering comprises the following steps:
and (3) heating: slowly heating from room temperature to 450 ℃ at a heating rate of 0.6 ℃/min, preserving heat for 2 hours, continuously heating to 850 ℃ at a heating rate of 1.3 ℃/min after the binder is discharged, and preserving heat for 2 hours;
and (3) a shrinkage stage: continuously heating to 1130 ℃ at a heating rate of 1.5 ℃/min;
and (3) heat preservation: preserving heat for 2h at 1150 ℃;
and (3) a cooling stage: after the baking, the temperature is reduced, and the cooling rate is 1.5 ℃/min.
The performance of the manufactured magnetic core was evaluated, and the center pillar strength and the bending strength of the magnetic core were tested by a digital push-pull tester, and the test results are shown in table 2.
Traditional materials
The main component of the traditional material comprises Fe 2 O 3 NiO, znO, cuO and also proper amount of Bi 2 O 3 Etc., but without SnO 2 、Co 2 O 3 Glass frits, and the like, particularly glass frits specific to the present application. The proportions of the components can be as in the previous examples 1 to 5, for example the proportions of the components in the conventional material can be as described in example 5, bi in weight percent of the ferrite material 2 O 3 0.25wt%.
Table 1 comparison of test results for materials
Table 2 comparative table of core product test results
As can be seen from tables 1 and 2: examples 1 to 5 prove that the ferrite material has higher initial magnetic permeability mu i and can reach more than 800; the saturation magnetic induction density Bs is higher and can reach more than 400; the absolute value of the specific temperature coefficient alpha at 20-60 ℃ is (1.0+/-0.5) 10 < -6 >; the mechanical strength is more than 400N, and the bending strength is more than 150MPa. The strength of the center pillar of the magnetic core manufactured by the material is more than 20N, and the bending strength is more than 2mm.
In addition, in this application, taking example 1 as an example, a topography analysis test is performed, please refer to fig. 2 to 4, wherein fig. 2 is a scanning electron microscope image of a ferrite material section of the embodiment of this application, fig. 3 is a scanning electron microscope image of a conventional ferrite material section, fig. 4 is a grain boundary microstructure diagram of the ferrite material of the embodiment of this application, and fig. 5 is a grain boundary microstructure diagram of the conventional ferrite material. As can be seen from comparison of fig. 2 and 3 and comparison of fig. 4 and 5, the ferrite material of the embodiment of the present application has fine and uniform grains and thinner grain boundaries.
The foregoing description is only a partial embodiment of the present application and is not intended to limit the scope of the patent application, and it is intended that all equivalent structural modifications made by those skilled in the art using the present description and accompanying drawings be included in the scope of the patent application.
Although the terms first, second, etc. are used herein to describe various information, these information should not be limited by these terms. These terms are only used to distinguish one type of information from another. In addition, the singular forms "a", "an" and "the" are intended to include the plural forms as well. The terms "or" and/or "are to be construed as inclusive, or mean any one or any combination. An exception to this definition will occur only when a combination of elements, functions, steps or operations are in some way inherently mutually exclusive.
Claims (10)
1. A ferrite material characterized by comprising a main component and an additive;
the main components comprise the following components in percentage by weight: 58.5 to 66.5 weight percent of Fe 2 O 3 ，7.5wt％18.5wt% of NiO,10.0wt% to 21.0wt% of ZnO and 3.0wt% to 7.0wt% of CuO;
the additive comprises the following components in percentage by weight of the ferrite material: 0.2 to 1.0 weight percent of Bi 2 O 3 0.05 to 0.25 weight percent of SnO 2 Co in 0.05-0.15 wt% 2 O 3 0.1 to 0.5wt% of glass frit comprising at least SiO 2 、B 2 O 3 And Al 2 O 3 。
2. The ferrite material of claim 1, wherein the glass frit comprises, in weight percent: 35.0 to 65.0 weight percent of SiO 2 2.0 to 10.0 weight percent of B 2 O 3 1.0 to 10.0wt% of Li 2 O,1.0wt% to 10.0wt% of K 2 2.0 to 6.0 weight percent of O and Al 2 O 3 1.0 to 8.0 weight percent of CaO,0.1 to 1.0 weight percent of Fe 2 O 3 0.1 to 1.0 weight percent of NiO,0.1 to 1.0 weight percent of CuO and 0.1 to 1.0 weight percent of ZnO.
3. The ferrite material according to claim 2, wherein the main component comprises, in terms of purity: fe (Fe) 2 O 3 ≥99.5wt％，NiO≥99.5wt％，ZnO≥99.5wt％，CuO≥99.5wt％，Bi 2 O 3 ≥98.5wt％，SnO 2 ≥99wt％，Co 2 O 3 ≥99wt％，SiO 2 ≥99wt％，B 2 O 3 ≥99wt％，Li 2 O≥99wt％，K 2 O≥99wt％，Al 2 O 3 ≥99wt％，CaO≥99wt％。
4. A method of preparing a ferrite material, comprising:
s1, the configuration at least comprises SiO 2 、B 2 O 3 And Al 2 O 3 Ball milling, melting, quenching and crushing the glass powder raw material to obtain glass powder;
s2, mixing main component raw materials, and sequentially grinding, drying and presintering to obtain a main component, wherein the main component comprises the following components in percentage by weight: 58.5 to 66.5 weight percent of Fe 2 O 3 7.5 to 18.5 weight percent of NiO,10.0 to 21.0 weight percent of ZnO and 3.0 to 7.0 weight percent of CuO;
s3, mixing the glass powder, the main component and other additives, wherein the glass powder and the other additives are used as additives, and the additives comprise the following components in percentage by weight of the ferrite material: 0.2 to 1.0 weight percent of Bi 2 O 3 0.05 to 0.25 weight percent of SnO 2 Co in 0.05-0.15 wt% 2 O 3 0.1 to 0.5 weight percent of glass powder; and then granulating, press forming and sintering in sequence to obtain the ferrite material.
5. The method according to claim 4, wherein in said S1:
the glass powder comprises the following raw materials in percentage by weight: 35.0 to 65.0 weight percent of SiO 2 2.0 to 10.0 weight percent of B 2 O 3 1.0 to 10.0wt% of Li 2 O,1.0wt% to 10.0wt% of K 2 2.0 to 6.0 weight percent of O and Al 2 O 3 1.0 to 8.0 weight percent of CaO,0.1 to 1.0 weight percent of Fe 2 O 3 0.1 to 1.0 weight percent of NiO,0.1 to 1.0 weight percent of CuO and 0.1 to 1.0 weight percent of ZnO;
the preset melting temperature is 1400-1500 ℃ and the heat preservation time is 2-4 h; the particle size of D50 obtained by pulverization was 1.0 μm.+ -. 0.5. Mu.m.
6. The method according to claim 4 or 5, characterized in that in S2:
the particle size of D50 obtained by grinding is 1.0 mu m + -0.2 mu m;
the temperature of the drying is 100-200 ℃ and the time is 10-24 hours;
the presintering temperature is 830-880 ℃, the heating rate is 1-4 ℃/min, and the heat preservation time is 2-4 h.
7. The method according to claim 6, characterized in that in said S3:
mixing the glass powder, the main component and other additives, and then performing ball milling to obtain D50 with the granularity of 1.0 mu m plus or minus 0.2 mu m;
and adding a binder into the mixture obtained after ball milling for granulating, press forming and sintering.
8. The method according to claim 7, wherein in the step of press forming, the pressure for pressing into a ring shape is 3T to 5T, the dwell time is 2s to 5s, the forming thickness is 3mm to 4mm, the inner diameter is 8.5mm to 9mm, and the outer diameter is 13mm to 15mm; the pressure for pressing the strip is 5T-7T, the pressure maintaining time is 2 s-5 s, the molding thickness is 3 mm-4 mm, the length is 46 mm-47 mm, and the width is 4 mm-5 mm.
9. The method according to claim 7, characterized in that in said S3:
the sintering temperature is 1050-1200 ℃; sintering comprises the following steps:
and (3) heating: heating from room temperature to 400-500 ℃ at a heating rate of 0.3-1.0 ℃/min, and heating to 800-900 ℃ at a heating rate of 1.0-2.0 ℃/min after the binder is discharged;
and (3) a shrinkage stage: heating to 1050-1200 deg.c at the heating rate of 0.5-1.5 deg.c/min;
and (3) heat preservation: preserving heat for 1-4 h at 1050-1200 ℃;
and (3) a cooling stage: the cooling rate is 0.5-2.0 ℃/min.
10. A magnetic core comprising the ferrite material of any one of claims 1 to 3 or produced by the method of producing a ferrite material of any one of claims 4 to 9.
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