CN110767406A - High-frequency high-impedance manganese-zinc ferrite and preparation method thereof - Google Patents
High-frequency high-impedance manganese-zinc ferrite and preparation method thereof Download PDFInfo
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- CN110767406A CN110767406A CN201910916643.3A CN201910916643A CN110767406A CN 110767406 A CN110767406 A CN 110767406A CN 201910916643 A CN201910916643 A CN 201910916643A CN 110767406 A CN110767406 A CN 110767406A
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- 229910001289 Manganese-zinc ferrite Inorganic materials 0.000 title claims abstract description 29
- JIYIUPFAJUGHNL-UHFFFAOYSA-N [O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[Mn++].[Mn++].[Mn++].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Zn++].[Zn++] Chemical compound [O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[Mn++].[Mn++].[Mn++].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Zn++].[Zn++] JIYIUPFAJUGHNL-UHFFFAOYSA-N 0.000 title claims abstract description 29
- 238000002360 preparation method Methods 0.000 title abstract description 10
- 238000005245 sintering Methods 0.000 claims abstract description 46
- 239000000463 material Substances 0.000 claims abstract description 27
- 238000000034 method Methods 0.000 claims abstract description 14
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 6
- 229910052726 zirconium Inorganic materials 0.000 claims abstract description 6
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 3
- 239000004576 sand Substances 0.000 claims description 30
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 25
- 229910052760 oxygen Inorganic materials 0.000 claims description 25
- 239000001301 oxygen Substances 0.000 claims description 25
- 238000001816 cooling Methods 0.000 claims description 17
- 239000000843 powder Substances 0.000 claims description 15
- 238000001035 drying Methods 0.000 claims description 10
- 238000005469 granulation Methods 0.000 claims description 10
- 230000003179 granulation Effects 0.000 claims description 10
- 238000000227 grinding Methods 0.000 claims description 10
- 239000012778 molding material Substances 0.000 claims description 10
- 238000005303 weighing Methods 0.000 claims description 10
- 238000000748 compression moulding Methods 0.000 claims description 5
- 238000000465 moulding Methods 0.000 claims description 5
- 239000011572 manganese Substances 0.000 claims description 2
- 239000013078 crystal Substances 0.000 abstract description 12
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 6
- 239000000203 mixture Substances 0.000 abstract description 5
- 230000008569 process Effects 0.000 abstract description 4
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 3
- 238000010438 heat treatment Methods 0.000 description 15
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 12
- 239000011787 zinc oxide Substances 0.000 description 6
- 229910000859 α-Fe Inorganic materials 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- GNRSAWUEBMWBQH-UHFFFAOYSA-N nickel(II) oxide Inorganic materials [Ni]=O GNRSAWUEBMWBQH-UHFFFAOYSA-N 0.000 description 4
- 230000003247 decreasing effect Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- AMWRITDGCCNYAT-UHFFFAOYSA-L manganese oxide Inorganic materials [Mn].O[Mn]=O.O[Mn]=O AMWRITDGCCNYAT-UHFFFAOYSA-L 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000035699 permeability Effects 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000010923 batch production Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 239000008204 material by function Substances 0.000 description 1
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- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
- H01F1/34—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials non-metallic substances, e.g. ferrites
- H01F1/36—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials non-metallic substances, e.g. ferrites in the form of particles
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Abstract
The invention discloses a high-frequency high-impedance manganese-zinc ferrite and a preparation method thereof, wherein the high-frequency high-impedance manganese-zinc ferrite comprises a main component and a doping component; the main component comprises Fe2O372.0-73.0Wt%, ZnO 4.0-5.6Wt%, and Mn for the rest3O4The total amount is 100%; the doping component comprises Ca, Nb, Si, Zr, NiO and Co, and accounts for 0.21-1.7% of the total mass of the main component. The invention ensures higher use frequency and lower magnetic conductivity by adjusting the proportion of the main components; the crystal structure of the material is improved by improving the composition and the proportion of the doping components, so that the grains are fine and uniform, and the high-frequency low power consumption of the material is improved; and through a specific nitrogen kiln sintering process, crystal grains are refined, the resistivity of the product is improved, and the method further improves the yield of the productThe frequency of use is increased.
Description
Technical Field
The invention relates to the field of manganese-zinc ferrite magnetic rings, in particular to a high-frequency high-impedance manganese-zinc ferrite and a preparation method thereof.
Background
The soft magnetic ferrite is a soft magnetic material used earlier in a switching power supply transformer, and corresponding materials are developed one generation after another along with the increasing working frequency of the switching power supply. In the early 70 s, in order to meet the requirements of the switching power supply market, the first-generation power ferrite material is developed and is only suitable for civil switching power supplies with the working frequency of about 20 kHz. In the early 80 s, a second-generation power ferrite material appeared, which has negative temperature coefficient power consumption, the power consumption is in a descending trend along with the temperature rise, and the applicable working frequency is about 100 kHz. In the later 80 s, in order to adapt to the development of high-frequency switching power supplies, third-generation power ferrite materials are developed, and the working frequency of the third-generation power ferrite materials is about 250 kHz. In recent 2 years, due to the continuous development of electronic communication and network technology, the information technology puts higher demands on the miniaturization and the chip type of devices, the working frequency of the material is improved and gradually increased from 500kHz to 1MHZ, which contributes to the further lightness, smallness and thinness of the switching power supply,
soft magnetic ferrite materials are widely used and have a wide variety of functional materials. With the recent requirements of information technology and new green lighting, materials are further developed toward high frequency, high impedance and low loss. The devices are developed to miniaturization, sheet type and surface mounting.
At present, manufacturers for producing manganese-zinc ferrite materials in China cannot meet the requirements of the market, and the materials are urgently needed to be developed in small-batch production.
Disclosure of Invention
The invention mainly solves the technical problems that: aiming at the defects of the prior art, the high-frequency high-impedance manganese-zinc ferrite and the preparation method thereof are provided, have higher use frequency and lower magnetic conductivity, and also have the characteristics of low power consumption and high Curie temperature of the material.
In order to solve the technical problems, the invention adopts a technical scheme that: the high-frequency high-impedance manganese-zinc ferrite comprises a main component and a doping component; the main component comprises Fe2O372.0-73.0Wt%, ZnO 4.0-5.6Wt%, and Mn for the rest3O4The total amount is 100%; the doping component comprises Ca, Nb, Si, Zr, NiO and Co, and accounts for 0.21-1.7% of the total mass of the main component.
In a preferred embodiment of the invention, the Ca is controlled to be 0.03-0.1%, the Nb is controlled to be 0.02-0.06%, the Si is controlled to be 0.005-0.01%, the Zr is controlled to be 0.01-0.03%, the NiO is controlled to be 0.1-1.0%, and the Co is controlled to be 0.05-0.5%.
Also provides a preparation method of the high-frequency high-impedance manganese-zinc ferrite, which comprises the following steps:
(100) weighing: weighing the main component and the doped component according to the formula for later use;
(200) primary sanding: putting the weighed main components in the step (100) into a sand mill for sanding, and then drying to obtain a primary sand abrasive;
(300) pre-burning: putting the primary sand grinding material obtained in the step (200) into a pre-sintering furnace for pre-sintering to obtain pre-sintered powder;
(400) secondary sanding: adding the weighed doping components in the step (100) into the pre-sintering powder obtained in the step (300), then placing the pre-sintering powder into a sand mill for sanding, and then drying to obtain secondary sand abrasive;
(500) and (3) granulation: adding PVA with the concentration of 6-8% into the secondary sand grinding material obtained in the step (400) for granulation, and performing compression molding to obtain a molding material;
(600) and (3) sintering: and (5) placing the molding material obtained in the step (500) in a bell jar furnace, and sintering and molding at a certain sintering temperature according to an atmosphere curve of balanced oxygen partial pressure to obtain the high-frequency high-impedance manganese-zinc ferrite.
In a preferred embodiment of the invention, the total mass of the body components weighed in said step (100) is 2 kg.
In a preferred embodiment of the present invention, the duration of one sanding in the step (200) is 60 minutes.
In a preferred embodiment of the present invention, the temperature of the pre-firing in the step (300) is 960 ℃, and the time is 2.5 hours.
In a preferred embodiment of the present invention, the duration of the secondary sanding in the step (400) is 150 minutes.
In a preferred embodiment of the present invention, the sintering temperature in the step (600) is 1280-1300 ℃.
In a preferred embodiment of the present invention, during the sintering in the step (600), the temperature is first raised from room temperature to 650 ℃ at a heating rate of 1-1.5 ℃/min in the atmospheric atmosphere, then raised from 650 ℃ to 1080 ℃ at a heating rate of 1-1.5 ℃/min under the condition of balanced oxygen partial pressure, and then raised from 1080 ℃ to 1280-1300 ℃ at a heating rate of 5-7 ℃/min, and the temperature is maintained for 3.5-6.5 h.
In a preferred embodiment of the present invention, during the cooling in the step (600), the temperature is first decreased from 1280-1300 ℃ to 1080 ℃ at a temperature decrease rate of 1.5-2 ℃/min under an oxygen partial pressure of 1-3%, then decreased from 1080 ℃ to 500 ℃ at a temperature decrease rate of 5-7 ℃/min under an oxygen partial pressure of 0.5-1.5%, and finally decreased to room temperature at a temperature decrease rate of 2.5-3 ℃/min under an oxygen partial pressure of 0.01-0.05%.
The invention has the beneficial effects that: the main composition formula of the product is changed into an iron-rich formula and the content of zinc oxide is reduced by adjusting the proportion of main components, so that higher use frequency and lower magnetic conductivity are ensured; the crystal structure of the material is improved by improving the composition and the proportion of the doping components, so that the grains are fine and uniform, and the high-frequency low power consumption of the material is improved; and through a specific nitrogen kiln sintering process, crystal grains are refined, the resistivity of the product is improved, and the use frequency is further improved.
Detailed Description
The following detailed description of the preferred embodiments of the present invention is provided to enable those skilled in the art to more readily understand the advantages and features of the present invention, and to clearly and unequivocally define the scope of the present invention.
Example one
A high-frequency high-impedance manganese-zinc ferrite comprises a main component and a doping component; the main component comprises Fe2O372.0wt%、ZnO 4.0Wt%,Mn3O424 Wt% to ensure higher use frequency and lower magnetic permeability; the doping component comprises Ca, Nb, Si, Zr, NiO and Co, and accounts for 0.215 percent of the total mass of the main component; wherein the content of Ca is 0.03%, the content of Nb is 0.02%, the content of Si is 0.005%, the content of Zr is 0.01%, the content of NiO is 0.1%, and the content of Co is 0.05%. By selecting high-purity and high-specific surface area raw materials, the density of the product is increased, crystal grains are refined, the crystal structure is improved, and the product is further improvedHigh Bs and low power consumption, and improves the use frequency.
The preparation method of the high-frequency high-impedance manganese-zinc ferrite comprises the following steps:
(100) weighing: weighing the main component and the doped component according to the formula for later use; the total mass of the main components is 2 kg;
(200) primary sanding: putting the weighed main components in the step (100) into a sand mill, sanding for 60 minutes, and then drying to obtain a primary sand abrasive;
(300) pre-burning: putting the primary sand grinding material obtained in the step (200) into a pre-sintering furnace for pre-sintering, wherein the temperature during pre-sintering is 960 ℃, and the time is 2.5 hours, so as to obtain pre-sintered powder;
(400) secondary sanding: adding the weighed doping components in the step (100) into the pre-sintering powder obtained in the step (300), then placing the pre-sintering powder into a sand mill for sanding for 150 minutes, and then drying to obtain a secondary sand abrasive;
(500) and (3) granulation: adding PVA with the concentration of 6% into the secondary sand grinding material obtained in the step (400) for granulation, and performing compression molding to obtain a molding material;
(600) and (3) sintering: placing the molding material obtained in the step (500) in a bell jar furnace, and sintering and molding at a sintering temperature of 1280 ℃ according to an atmosphere curve of balanced oxygen partial pressure, wherein the specific steps are as follows: firstly, in the atmosphere, heating from room temperature to 650 ℃ at the heating rate of 1 ℃/min, then under the condition of balanced oxygen partial pressure, heating from 650 ℃ to 1080 ℃ at the heating rate of 1 ℃/min, then heating from 1080 ℃ to 1280 ℃ at the heating rate of 5 ℃/min, and preserving heat for 3.5 hours; then firstly reducing the temperature from 1280 ℃ to 1080 ℃ at the cooling rate of 1.5 ℃/min under the oxygen partial pressure of 1 percent, then reducing the temperature from 1080 ℃ to 500 ℃ at the cooling rate of 5 ℃/min under the oxygen partial pressure of 0.5 percent, and finally reducing the temperature to the room temperature at the cooling rate of 2.5 ℃/min under the oxygen partial pressure of 0.01 percent to obtain the high-frequency high-impedance manganese zinc ferrite with the specification of 25mm multiplied by 15 mm multiplied by 8 mm.
Example two
A high-frequency high-impedance manganese-zinc ferrite comprises a main component and a doping component; the main component comprises Fe2O373.0wt%、ZnO 5.6Wt%,Mn3O421.4 Wt% to ensure higher use frequency and lower magnetic permeability; the doping component comprises Ca, Nb, Si, Zr, NiO and Co, and accounts for 1.7% of the total mass of the main component; wherein the content of Ca is 0.1%, the content of Nb is 0.06%, the content of Si is 0.01%, the content of Zr is 0.03%, the content of NiO is 1.0%, and the content of Co is 0.5%. By selecting raw materials with high purity and high specific surface area, the density of the product is improved, crystal grains are refined, the crystal structure is improved, Bs (saturation area) is further improved, the power consumption is low, and the use frequency is improved.
The preparation method of the high-frequency high-impedance manganese-zinc ferrite comprises the following steps:
(100) weighing: weighing the main component and the doped component according to the formula for later use; the total mass of the main components is 2 kg;
(200) primary sanding: putting the weighed main components in the step (100) into a sand mill, sanding for 60 minutes, and then drying to obtain a primary sand abrasive;
(300) pre-burning: putting the primary sand grinding material obtained in the step (200) into a pre-sintering furnace for pre-sintering, wherein the temperature during pre-sintering is 960 ℃, and the time is 2.5 hours, so as to obtain pre-sintered powder;
(400) secondary sanding: adding the weighed doping components in the step (100) into the pre-sintering powder obtained in the step (300), then placing the pre-sintering powder into a sand mill for sanding for 150 minutes, and then drying to obtain a secondary sand abrasive;
(500) and (3) granulation: adding PVA with the concentration of 8% into the secondary sand grinding material obtained in the step (400) for granulation, and performing compression molding to obtain a molding material;
(600) and (3) sintering: and (3) placing the molding material obtained in the step (500) in a bell jar furnace, and sintering and molding at the sintering temperature of 1300 ℃ according to the atmosphere curve of the balanced oxygen partial pressure, wherein the specific steps are as follows: firstly, in the atmosphere, the temperature is increased from room temperature to 650 ℃ at the temperature increase rate of 1.5 ℃/min, then under the condition of balanced oxygen partial pressure, the temperature is increased from 650 ℃ to 1080 ℃ at the temperature increase rate of 1.5 ℃/min, then the temperature is increased from 1080 ℃ to 1300 ℃ at the temperature increase rate of 7 ℃/min, and the temperature is kept for 6.5 hours; then firstly reducing the temperature from 1300 ℃ to 1080 ℃ at the cooling rate of 2 ℃/min under the oxygen partial pressure of 3 percent, then reducing the temperature from 1080 ℃ to 500 ℃ at the cooling rate of 7 ℃/min under the oxygen partial pressure of 1.5 percent, and finally reducing the temperature to the room temperature at the cooling rate of 3 ℃/min under the oxygen partial pressure of 0.05 percent to obtain the high-frequency high-impedance manganese-zinc ferrite with the specification of 25mm multiplied by 15 mm multiplied by 8 mm.
EXAMPLE III
A high-frequency high-impedance manganese-zinc ferrite comprises a main component and a doping component; the main component comprises Fe2O373.0wt%、ZnO 5.6Wt%,Mn3O421.4 Wt% to ensure higher use frequency and lower magnetic permeability; the doping component comprises Ca, Nb, Si, Zr, NiO and Co, and accounts for 0.96% of the total mass of the main component; wherein the content of Ca is 0.065%, the content of Nb is 0.04%, the content of Si is 0.01%, the content of Zr is 0.02%, the content of NiO is 0.55%, and the content of Co is 0.275%. By selecting raw materials with high purity and high specific surface area, the density of the product is improved, crystal grains are refined, the crystal structure is improved, Bs (saturation area) is further improved, the power consumption is low, and the use frequency is improved.
The preparation method of the high-frequency high-impedance manganese-zinc ferrite comprises the following steps:
(100) weighing: weighing the main component and the doped component according to the formula for later use; the total mass of the main components is 2 kg;
(200) primary sanding: putting the weighed main components in the step (100) into a sand mill, sanding for 60 minutes, and then drying to obtain a primary sand abrasive;
(300) pre-burning: putting the primary sand grinding material obtained in the step (200) into a pre-sintering furnace for pre-sintering, wherein the temperature during pre-sintering is 960 ℃, and the time is 2.5 hours, so as to obtain pre-sintered powder;
(400) secondary sanding: adding the weighed doping components in the step (100) into the pre-sintering powder obtained in the step (300), then placing the pre-sintering powder into a sand mill for sanding for 150 minutes, and then drying to obtain a secondary sand abrasive;
(500) and (3) granulation: adding PVA with the concentration of 7% into the secondary sand grinding material obtained in the step (400) for granulation, and performing compression molding to obtain a molding material;
(600) and (3) sintering: and (3) placing the molding material obtained in the step (500) in a bell jar furnace, and sintering and molding at the sintering temperature of 1290 ℃ according to the atmosphere curve of the balanced oxygen partial pressure, wherein the specific steps are as follows: firstly, in the atmosphere, heating from room temperature to 650 ℃ at the heating rate of 1 ℃/min, then under the condition of balanced oxygen partial pressure, heating from 650 ℃ to 1080 ℃ at the heating rate of 1.5 ℃/min, then heating from 1080 ℃ to 1290 ℃ at the heating rate of 6 ℃/min, and keeping the temperature for 4.5 h; then firstly reducing the temperature from 1290 ℃ to 1080 ℃ at the cooling rate of 1.5 ℃/min under the oxygen partial pressure of 2 percent, then reducing the temperature from 1080 ℃ to 500 ℃ at the cooling rate of 6 ℃/min under the oxygen partial pressure of 1 percent, and finally reducing the temperature to room temperature at the cooling rate of 2.5 ℃/min under the oxygen partial pressure of 0.03 percent to obtain the high-frequency high-impedance manganese-zinc ferrite with the specification of 25mm multiplied by 15 mm multiplied by 8 mm.
The high-frequency high-impedance manganese-zinc ferrite obtained by the method has the initial magnetic conductivity of 1200 +/-25% at 25 ℃ through testing; the power loss is 180Kw/m under the test conditions of 500KHZ, 50mT and 25 DEG C3The power loss is 120Kw/m under the test condition of 1MHZ, 30mT and 100 DEG C3(ii) a Curie temperature is more than or equal to 240 ℃; the saturation magnetic flux density Bs is more than or equal to 480mT under the conditions of 25 ℃ and 1200A/m; under the condition of 100 ℃ and H =1200A/m, the saturation magnetic flux density Bs is not less than 415 mT.
The invention discloses a high-frequency high-impedance manganese-zinc ferrite and a preparation method thereof, wherein a main composition formula of a product is changed into an iron-rich formula and the content of zinc oxide is reduced through the proportioning adjustment of main components so as to ensure higher use frequency and lower magnetic conductivity; the crystal structure of the material is improved by improving the composition and the proportion of the doping components, so that the grains are fine and uniform, and the high-frequency low power consumption of the material is improved; and through a specific nitrogen kiln sintering process, crystal grains are refined, the resistivity of the product is improved, and the use frequency is further improved.
In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown or the orientations or positional relationships that the products of the present invention usually place when using, and are used only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or the element that is referred to must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present invention. The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by the present specification, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. The high-frequency high-impedance manganese-zinc ferrite is characterized by comprising a main component and a doping component; the main component comprises Fe2O372.0-73.0Wt%, ZnO 4.0-5.6Wt%, and Mn for the rest3O4The total amount is 100%; the doping component comprises Ca, Nb, Si, Zr, NiO and Co, and accounts for 0.21-1.7% of the total mass of the main component.
2. The manganese-zinc-ferrite with high frequency and high impedance as claimed in claim 1, wherein said Ca is controlled to be 0.03-0.1%, said Nb is controlled to be 0.02-0.06%, said Si is controlled to be 0.005-0.01%, said Zr is controlled to be 0.01-0.03%, said NiO is controlled to be 0.1-1.0%, and said Co is controlled to be 0.05-0.5%.
3. A method for preparing a high frequency high impedance manganese zinc ferrite as claimed in any one of claims 1 to 2, comprising the steps of:
(100) weighing: weighing the main component and the doped component according to the formula for later use;
(200) primary sanding: putting the weighed main components in the step (100) into a sand mill for sanding, and then drying to obtain a primary sand abrasive;
(300) pre-burning: putting the primary sand grinding material obtained in the step (200) into a pre-sintering furnace for pre-sintering to obtain pre-sintered powder;
(400) secondary sanding: adding the weighed doping components in the step (100) into the pre-sintering powder obtained in the step (300), then placing the pre-sintering powder into a sand mill for sanding, and then drying to obtain secondary sand abrasive;
(500) and (3) granulation: adding PVA with the concentration of 6-8% into the secondary sand grinding material obtained in the step (400) for granulation, and performing compression molding to obtain a molding material;
(600) and (3) sintering: and (5) placing the molding material obtained in the step (500) in a bell jar furnace, and sintering and molding at a certain sintering temperature according to an atmosphere curve of balanced oxygen partial pressure to obtain the high-frequency high-impedance manganese-zinc ferrite.
4. The method for preparing high-frequency high-impedance manganese-zinc-ferrite according to claim 3, wherein the total mass of the bulk components weighed in the step (100) is 2 kg.
5. The method for preparing high-frequency high-impedance manganese-zinc ferrite according to claim 3, wherein the duration of one-time sanding in the step (200) is 60 minutes.
6. The method as claimed in claim 3, wherein the pre-sintering in the step (300) is performed at a temperature of 960 ℃ for 2.5 hours.
7. The method for preparing high-frequency high-impedance manganese-zinc ferrite according to claim 3, wherein the duration of the secondary sanding in the step (400) is 150 minutes.
8. The method as claimed in claim 3, wherein the sintering temperature in step (600) is 1280-1300 ℃.
9. The method as claimed in claim 8, wherein the step (600) of sintering is performed by first raising the temperature from room temperature to 650 ℃ at a rate of 1-1.5 ℃/min in an atmospheric atmosphere, then raising the temperature from 650 ℃ to 1080 ℃ at a rate of 1-1.5 ℃/min under the condition of balanced oxygen partial pressure, and then raising the temperature from 1080 ℃ to 1280 ℃ and 1300 ℃ at a rate of 5-7 ℃/min, and keeping the temperature for 3.5-6.5 h.
10. The method as claimed in claim 8, wherein the cooling in step (600) is performed by cooling from 1280 ℃. — > 1300 ℃ to 1080 ℃ at a cooling rate of 1.5-2 ℃/min under an oxygen partial pressure of 1-3%, cooling from 1080 ℃ to 500 ℃ at a cooling rate of 5-7 ℃/min under an oxygen partial pressure of 0.5-1.5%, and finally cooling to room temperature at a cooling rate of 2.5-3 ℃/min under an oxygen partial pressure of 0.01-0.05%.
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