A manganese-zinc ferrite material, a preparation method and application thereof

Abstract

This invention relates to the field of ferrite materials technology, specifically to a manganese-zinc ferrite material, its preparation method, and its applications. The manganese-zinc ferrite material provided by this invention comprises main components and auxiliary components. The main components include 52.0–53.0 mol% Fe₂O₃, 18.0–19.0 ​​mol% ZnO, and 28.0–29.5 mol% MnO. Based on the total weight of the main components, the auxiliary components include 100–2000 ppm Co₂O₃, 100–2000 ppm Bi₂O₃, and 100–2000 ppm MoO₃. In this invention, by limiting the main components to Fe₂O₃, ZnO, and MnO, and the auxiliary components to Co₂O₃, Bi₂O₃, and MoO₃, and by limiting the relative content of each component, the final manganese-zinc ferrite material obtained has high magnetic permeability.

Description

Technical Field

[0001] This invention relates to the field of ferrite materials technology, specifically to a manganese-zinc ferrite material, its preparation method, and its application. Background Technology

[0002] Wireless charging, as a fashionable and convenient charging method, has gained popularity and attention from consumers, and is developing rapidly in the field of consumer electronics such as mobile phones and tablets. However, with the widespread application of wireless charging technology in smart mobile terminal devices, the drawbacks of wireless charging devices have gradually become apparent. Due to space constraints, the coil of the wireless charging receiver inevitably has to be close to metal components such as circuit boards or batteries. As we all know, when an alternating magnetic field encounters a conductor such as a metal, if the metal is a closed wire, a current will be generated. The current will generate a reverse magnetic field to reduce the original magnetic field. If the metal is a solid piece of metal, due to the skin effect, an eddy current effect will be generated. Eddy current heating not only consumes too much electrical energy, but also generates a lot of heat, which not only reduces charging efficiency and wastes electrical energy, but also damages electronic devices and may even pose safety problems such as fire and explosion. To avoid the above phenomena, improve charging efficiency, and ensure safety, the current mainstream solution is to attach a soft magnetic ferrite sheet between the wireless charging receiving coil and the metal component. This ferrite sheet can effectively isolate the alternating magnetic field from the metal component, avoid eddy current losses, and thus improve wireless charging efficiency.

[0003] However, existing ferrite sheets struggle to combine the properties of thinness and high sensitivity. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the problem that ferrite sheets in the prior art are difficult to have both thinness and high sensitivity, thereby providing a manganese zinc ferrite material, its preparation method and application.

[0005] This invention provides a manganese-zinc ferrite material, the raw materials of which include main components and auxiliary components;

[0006] The main components include 52.0–53.0 mol% Fe2O3, 18.0–19.0 ​​mol% ZnO, and 28.0–29.5 mol% MnO;

[0007] Based on the total weight of the main components: auxiliary components include 100-2000 ppm of Co2O3; 100-2000 ppm of Bi2O3; and 100-2000 ppm of MoO3.

[0008] The present invention also provides a method for preparing the above-mentioned manganese-zinc ferrite material, comprising the following steps:

[0009] (1) Mix the main components and auxiliary components in the raw materials, pre-sinter, and first ball mill to obtain manganese-zinc ferrite mixture;

[0010] (2) The manganese zinc ferrite mixture is mixed with a binder, granulated, and sieved to obtain manganese zinc ferrite precursor particles.

[0011] (3) The solvent, dispersant, manganese zinc ferrite precursor particles, plasticizer and glue are mixed and then cast and sintered to obtain the manganese zinc ferrite material.

[0012] The main components include 52.0–53.0 mol% Fe2O3, 18.0–19.0 ​​mol% ZnO, and 28.0–29.5 mol% MnO;

[0013] Based on the total weight of the main components: auxiliary components include 0-2000 ppm Co2O3; 100-2000 ppm Bi2O3; and 100-2000 ppm MoO3.

[0014] Preferably, in step (1), the pre-sintering temperature is 700-850℃; the pre-sintering time is 2.5-3.5h;

[0015] Preferably, the particle size of the manganese-zinc ferrite mixture is 1.05-1.2 μm (SMD).

[0016] Preferably, the first ball milling time is 2-3 hours.

[0017] Understandably, SMD stands for Sauter Mean Diameter.

[0018] Preferably, in step (2), the mass ratio of the manganese-zinc ferrite mixture to the binder is 1:(0.06-0.09);

[0019] Preferably, the adhesive comprises polyvinyl alcohol;

[0020] Preferably, the particle size of the manganese zinc ferrite precursor obtained after sieving is SMD 3.05-5.6 μm.

[0021] Preferably, in step (3), the mass ratio of manganese zinc ferrite precursor particles, solvent, dispersant, plasticizer, and adhesive is (50-70):(5.5-7.5):(2.5-3.5):(3.5-4.5):(5.5-7.5);

[0022] Preferably, the process of mixing the solvent, dispersant, manganese zinc ferrite precursor particles, plasticizer, and adhesive involves a second ball milling of the solvent, dispersant, and manganese zinc ferrite precursor particles, followed by the addition of the plasticizer and adhesive for a third ball milling.

[0023] Preferably, the solvent is selected from at least one of methanol, ethanol, and acetone;

[0024] Preferably, the dispersant is selected from at least one of trioleic acid glyceride and fish oil;

[0025] Preferably, the plasticizer is selected from at least one of dibutyl phthalate, polyethylene glycol, and glycerol;

[0026] Preferably, the adhesive is selected from at least one of polymethyl methacrylate and polyvinyl butyral;

[0027] Preferably, the second ball milling time is 4-8 hours;

[0028] Preferably, the third ball milling time is 12-24 hours.

[0029] Preferably, the thickness of the cast sheet obtained by casting is 18-40 μm.

[0030] Preferably, the process of cutting is also included after casting and before sintering;

[0031] Preferably, the cut casting sheet is a rectangle with a length of 50-150mm and a width of 50-150mm;

[0032] Preferably, during the sintering process in step (3), the tape is pressed and released on one side only;

[0033] Preferably, the sintering atmosphere in step (3) includes nitrogen and oxygen, wherein the oxygen content in the sintering atmosphere is 3 to 21 vol%.

[0034] Preferably, in step (3), the sintering temperature is 1000-1200℃;

[0035] Preferably, in step (3), the sintering process involves first heating to a first temperature, and then heating to a second temperature and holding for 2-6 hours.

[0036] Preferably, in step (3), the first temperature is 1000-1100℃ and the second temperature is 1130-1200℃;

[0037] Preferably, the heating rate from the first temperature to the second temperature is 1.5-3℃ / min.

[0038] Preferably, step (3) includes a pre-sintering process after casting and before sintering; the pre-sintering process is to pre-sinter at 550-650℃ for 2-4 hours; the pre-sintering atmosphere includes nitrogen and oxygen, wherein the oxygen content in the sintering atmosphere is 19-21 vol%.

[0039] Preferably, the heating process from the pre-sintering temperature to the first temperature takes 6-8 hours; the atmosphere during the heating process is nitrogen.

[0040] Preferably, step (3) includes a cooling process after sintering, which is carried out under balanced oxygen partial pressure.

[0041] The present invention also provides a wireless charging device, wherein the wireless charging device comprises the manganese zinc ferrite material described above or the manganese zinc ferrite material prepared by the preparation method of the manganese zinc ferrite material described above.

[0042] The technical solution of this invention has the following advantages:

[0043] The present invention provides a manganese-zinc ferrite material, the raw materials of which include main components and auxiliary components; the main components include 52.0-53.0 mol% Fe2O3, 18.0-19.0 mol% ZnO, and 28.0-29.5 mol% MnO; based on the total weight of the main components, the auxiliary components include 100-2000 ppm Co2O3, 100-2000 ppm Bi2O3, and 100-2000 ppm MoO3.

[0044] In this invention, by limiting the main components to Fe2O3, ZnO, and MnO and the auxiliary components to Co2O3, Bi2O3, and MoO3, and by limiting the relative content of each component, the manganese-zinc ferrite material finally prepared has a high magnetic permeability.

[0045] Furthermore, this invention provides a method for preparing a manganese-zinc ferrite material, comprising the following steps:

[0046] (1) Mix the main components and auxiliary components in the raw materials, pre-sinter, and first ball mill to obtain manganese-zinc ferrite mixture;

[0047] (2) The manganese zinc ferrite mixture is mixed with the binder, granulated, and sieved to obtain manganese zinc ferrite precursor particles; (3) The solvent, dispersant, manganese zinc ferrite precursor particles, plasticizer, and glue are mixed and then cast and sintered to obtain the manganese zinc ferrite material; wherein, the main components include 52.0-53.0 mol% Fe2O3, 18.0-19.0 mol% ZnO, and 28.0-29.5 mol% MnO; based on the total weight of the main components: the auxiliary components include 0-2000 ppm Co2O3; 100-2000 ppm Bi2O3; and 100-2000 ppm MoO3.

[0048] In this invention, based on the determined composition, by selecting a specific preparation method, the thickness of the final cast manganese zinc ferrite material can be as high as 18 μm, with high flatness and high magnetic permeability, which can be better used in wireless charging devices. Detailed Implementation

[0049] The following embodiments are provided to better understand the present invention and are not limited to the preferred embodiments described. They do not constitute a limitation on the content and scope of protection of the present invention. Any product that is the same as or similar to the present invention, derived by any person under the guidance of the present invention or by combining the features of the present invention with other prior art, falls within the protection scope of the present invention.

[0050] For experiments not specifically described in the examples, the procedures or conditions should be followed according to the conventional experimental procedures described in the literature in this field. Reagents or instruments whose manufacturers are not specified are all commercially available conventional reagent products.

[0051] The viscosity of polyvinyl butyral used in the examples and comparative examples was 20–35 cP·s;

[0052] The polyvinyl alcohol (PVA) used in the examples and comparative examples has a molecular weight of 13,000-23,000.

[0053] Example 1

[0054] This embodiment provides a manganese-zinc ferrite material, the preparation method of which includes the following steps:

[0055] (1) Weigh the main components of the raw materials (including Fe2O3: 52.27mol%, MnO: 29.21mol%, ZnO: 18.52mol%) according to the molar percentage, and weigh the auxiliary components based on the total weight of the main components of the raw materials: Bi2O3: 400ppm, MoO3: 200ppm, Co2O3: 1200ppm;

[0056] (2) The main and auxiliary components of the raw materials were ball-milled in a ball mill for 30 min and then dried. After sintering at 820℃ for 3 h, they were horizontally ball-milled for 2.2 h (the abrasive material was zirconium dioxide, and the abrasive material was divided into large balls and small balls. The diameter of the large balls was 15 mm and the diameter of the small balls was 5 mm. The mass ratio of the two was 2:1). A manganese-zinc ferrite mixture (particle size SMD 1.05-1.2 μm) was obtained.

[0057] (3) The manganese zinc ferrite mixture and PVA material obtained above are mixed at a weight ratio of 1:0.08, granulated and sieved to obtain manganese zinc ferrite precursor particles with a particle size of SMD 3.05-5.0μm.

[0058] (4) Weigh out manganese-zinc ferrite precursor particles, ethanol (solvent), trioleic acid glyceride (dispersant), dibutyl phthalate (plasticizer), and polyvinyl butyral (adhesive) in a weight ratio of 60:6:3:4:6; mix the weighed solvent and dispersant with the manganese-zinc ferrite precursor particles and zirconium balls, and ball mill for 8 hours. Then add the weighed plasticizer and adhesive and continue ball milling for 15 hours. Cast the mixture into a 18μm sheet, and then cut it into 10mm pieces. A 0mm*100mm sheet was prepared. The sheet was pressed on one side and kept at 600℃ for 4 hours in an atmosphere with a nitrogen to oxygen volume ratio of (79:21). Then, it was heated to 1000℃ in a nitrogen atmosphere for 8 hours. After that, it was heated to 1160℃ in an atmosphere with a nitrogen to oxygen volume ratio of (94:6) at a heating rate of 2℃ / min and sintered at this atmosphere and temperature for 6 hours. Finally, it was cooled under a balanced oxygen partial pressure to obtain the manganese zinc ferrite material.

[0059] Example 2

[0060] This embodiment provides a manganese-zinc ferrite material, the preparation method of which includes the following steps:

[0061] (1) Weigh the main components of the raw materials (including Fe2O3: 52.26mol%, MnO: 29.34mol%, ZnO: 18.4mol%) according to the molar percentage, and weigh the auxiliary components based on the total weight of the main components of the raw materials: Bi2O3: 400ppm, MoO3: 200ppm, Co2O3: 1000ppm;

[0062] (2) The main and auxiliary components of the raw materials were ball-milled in a ball mill for 30 min and then dried. After sintering at 820℃ for 3 h, they were horizontally ball-milled for 2.2 h (the abrasive material was zirconium dioxide, and the abrasive material was divided into large balls and small balls. The diameter of the large balls was 15 mm and the diameter of the small balls was 5 mm. The mass ratio of the two was 2:1). A manganese-zinc ferrite mixture (particle size SMD 1.05-1.2 μm) was obtained.

[0063] (3) The manganese zinc ferrite mixture and PVA material obtained above are mixed at a weight ratio of 1:0.08, granulated and sieved to obtain manganese zinc ferrite precursor particles with a particle size of SMD 3.05-5.0μm.

[0064] (4) Weigh out manganese-zinc ferrite precursor particles, ethanol (solvent), trioleic acid glyceride (dispersant), dibutyl phthalate (plasticizer), and polyvinyl butyral (adhesive) in a weight ratio of 60:6:3:4:6; mix the weighed solvent and dispersant with the manganese-zinc ferrite precursor particles and zirconium balls, and ball mill for 8 hours. Then add the weighed plasticizer and adhesive and continue ball milling for 15 hours. Cast the mixture into a 18μm sheet, and then cut it into 10mm pieces. A 0mm*100mm sheet was prepared. The sheet was pressed on one side and kept at 600℃ for 4 hours in an atmosphere with a nitrogen to oxygen volume ratio of (79:21). Then, it was heated to 1000℃ in a nitrogen atmosphere for 8 hours. After that, it was heated to 1160℃ in an atmosphere with a nitrogen to oxygen volume ratio of (94:6) at a heating rate of 2℃ / min and sintered at this atmosphere and temperature for 6 hours. Finally, it was cooled under a balanced oxygen partial pressure to obtain the manganese zinc ferrite material.

[0065] Example 3

[0066] This embodiment provides a manganese-zinc ferrite material, the preparation method of which includes the following steps:

[0067] (1) Weigh the main components of the raw materials (including Fe2O3: 52.5mol%, MnO: 29mol%, ZnO: 18.5mol%) according to the molar percentage, and weigh the auxiliary components based on the total weight of the main components of the raw materials: Bi2O3: 400ppm, MoO3: 200ppm, Co2O3: 1500ppm;

[0068] (2) The main and auxiliary components of the raw materials were ball-milled in a ball mill for 30 min and then dried. After sintering at 850℃ for 3 h, they were horizontally ball-milled for 3 h (the abrasive material was zirconium dioxide, and the abrasive material was divided into large balls and small balls, with a diameter of 15 mm for the large balls and a diameter of 5 mm for the small balls, and a mass ratio of 2:1) to obtain a manganese-zinc ferrite mixture (particle size SMD 1.05-1.2 μm).

[0069] (3) The manganese zinc ferrite mixture and PVA material obtained above are mixed at a weight ratio of 1:0.08, granulated and sieved to obtain manganese zinc ferrite precursor particles with a particle size of SMD 3.05-5.0μm.

[0070] (4) Weigh out manganese-zinc ferrite precursor particles, ethanol (solvent), trioleic acid glyceride (dispersant), dibutyl phthalate (plasticizer), and polyvinyl butyral (adhesive) in a weight ratio of 50:6:3:4:7; mix the weighed solvent and dispersant with the manganese-zinc ferrite precursor particles and zirconium balls, and ball mill for 8 hours. Then add the weighed plasticizer and adhesive and continue ball milling for 15 hours. Cast the mixture into a 18μm cast sheet, and then cut it into 10mm pieces. A 0mm*100mm sheet was prepared. The sheet was pressed on one side and kept at 600℃ for 4 hours in an atmosphere with a nitrogen to oxygen volume ratio of (79:21). Then, it was heated to 1000℃ in a nitrogen atmosphere for 8 hours. After that, it was heated to 1160℃ in an atmosphere with a nitrogen to oxygen volume ratio of (94:6) at a heating rate of 2℃ / min and sintered at this atmosphere and temperature for 6 hours. Finally, it was cooled under a balanced oxygen partial pressure to obtain the manganese zinc ferrite material.

[0071] Example 4

[0072] This embodiment provides a manganese-zinc ferrite material, the preparation method of which includes the following steps:

[0073] (1) Weigh the main components of the raw materials (including Fe2O3: 52.5mol%, MnO: 29mol%, ZnO: 18.5mol%) according to the molar percentage, and weigh the auxiliary components based on the total weight of the main components of the raw materials: Bi2O3: 200ppm, MoO3: 100ppm, Co2O3: 2000ppm;

[0074] (2) The main and auxiliary components of the raw materials were ball-milled in a ball mill for 30 min and then dried. After sintering at 700℃ for 3.5 h, they were horizontally ball-milled for 2 h (the abrasive material was zirconium dioxide, and the abrasive material was divided into large balls and small balls, with a diameter of 15 mm for the large balls and a diameter of 5 mm for the small balls, and a mass ratio of 2:1) to obtain a manganese-zinc ferrite mixture (particle size SMD 1.05-1.2 μm).

[0075] (3) The manganese zinc ferrite mixture and PVA material obtained above are mixed at a weight ratio of 1:0.08, granulated and sieved to obtain manganese zinc ferrite precursor particles with a particle size of SMD 3.05-5.0μm.

[0076] (4) Weigh out manganese-zinc ferrite precursor particles, ethanol (solvent), trioleic acid glyceride (dispersant), dibutyl phthalate (plasticizer), and polyvinyl butyral (adhesive) in a weight ratio of 60:6:3:4:6; mix the weighed solvent and dispersant with the manganese-zinc ferrite precursor particles and zirconium balls, and ball mill for 8 hours. Then add the weighed plasticizer and adhesive and continue ball milling for 15 hours. Cast the mixture into a 18μm sheet, and then cut it into 10mm pieces. A 0mm*100mm sheet was prepared. The sheet was pressed on one side and kept at 600℃ for 4 hours in an atmosphere with a nitrogen to oxygen volume ratio of (79:21). Then, it was heated to 1000℃ in a nitrogen atmosphere for 8 hours. After that, it was heated to 1200℃ in an atmosphere with a nitrogen to oxygen volume ratio of (90:10) at a heating rate of 2℃ / min and sintered at this atmosphere and temperature for 6 hours. Finally, it was cooled under a balanced oxygen partial pressure to obtain the manganese zinc ferrite material.

[0077] Example 5

[0078] This embodiment provides a manganese-zinc ferrite material, the preparation method of which includes the following steps:

[0079] (1) Weigh the main components of the raw materials (including Fe2O3: 52.28mol%, MnO: 29mol%, ZnO: 18.72mol%) according to the molar percentage, and weigh the auxiliary components based on the total weight of the main components of the raw materials: Bi2O3: 400ppm, MoO3: 200ppm, Co2O3: 200ppm;

[0080] (2) The main and auxiliary components of the raw materials were ball-milled in a ball mill for 30 min and then dried. After sintering at 700℃ for 3.5 h, they were horizontally ball-milled for 2 h (the abrasive material was zirconium dioxide, and the abrasive material was divided into large balls and small balls, with a diameter of 15 mm for the large balls and a diameter of 5 mm for the small balls, and a mass ratio of 2:1) to obtain a manganese-zinc ferrite mixture (particle size SMD 1.05-1.2 μm).

[0081] (3) The manganese zinc ferrite mixture and PVA material obtained above are mixed at a weight ratio of 1:0.08, granulated and sieved to obtain manganese zinc ferrite precursor particles with a particle size of SMD 3.05-5.0μm.

[0082] (4) Weigh out manganese-zinc ferrite precursor particles, ethanol (solvent), trioleic acid glyceride (dispersant), dibutyl phthalate (plasticizer), and polyvinyl butyral (adhesive) in a weight ratio of 60:6:3:4:6; mix the weighed solvent and dispersant with the manganese-zinc ferrite precursor particles and zirconium balls, and ball mill for 8 hours. Then add the weighed plasticizer and adhesive and continue ball milling for 15 hours. Cast the mixture into a 18μm sheet, and then cut it into 10mm pieces. A 0mm*100mm sheet was prepared. The sheet was pressed on one side and kept at 600℃ for 4 hours in an atmosphere with a nitrogen to oxygen volume ratio of (79:21). Then, it was heated to 1000℃ in a nitrogen atmosphere for 8 hours. After that, it was heated to 1200℃ in an atmosphere with a nitrogen to oxygen volume ratio of (90:10) at a heating rate of 2℃ / min and sintered at this atmosphere and temperature for 6 hours. Finally, it was cooled under a balanced oxygen partial pressure to obtain the manganese zinc ferrite material.

[0083] Example 6

[0084] This embodiment provides a manganese-zinc ferrite material, the preparation method of which includes the following steps:

[0085] (1) Weigh the main components of the raw materials (including Fe2O3: 52.5mol%, MnO: 29.34mol%, ZnO: 18.16mol%) according to the molar percentage, and weigh the auxiliary components based on the total weight of the main components of the raw materials: Bi2O3: 1000ppm, MoO3: 400ppm, Co2O3: 200ppm;

[0086] (2) The main and auxiliary components of the raw materials were ball-milled in a ball mill for 30 min and then dried. After sintering at 700℃ for 3.5 h, they were horizontally ball-milled for 2 h (the abrasive material was zirconium dioxide, and the abrasive material was divided into large balls and small balls, with a diameter of 15 mm for the large balls and a diameter of 5 mm for the small balls, and a mass ratio of 2:1) to obtain a manganese-zinc ferrite mixture (particle size SMD 1.05-1.2 μm).

[0087] (3) The manganese zinc ferrite mixture and PVA material obtained above are mixed at a weight ratio of 1:0.08, granulated and sieved to obtain manganese zinc ferrite precursor particles with a particle size of SMD 3.05-5.0μm.

[0088] (4) Weigh out manganese-zinc ferrite precursor particles, ethanol (solvent), trioleic acid glyceride (dispersant), dibutyl phthalate (plasticizer), and polyvinyl butyral (adhesive) in a weight ratio of 60:6:3:4:6; mix the weighed solvent and dispersant with the manganese-zinc ferrite precursor particles and zirconium balls, and ball mill for 8 hours. Then add the weighed plasticizer and adhesive and continue ball milling for 15 hours. Cast the mixture into a 18μm sheet, and then cut it into 10mm pieces. A 0mm*100mm sheet was prepared. The sheet was pressed on one side and kept at 600℃ for 4 hours in an atmosphere with a nitrogen to oxygen volume ratio of (79:21). Then, it was heated to 1000℃ in a nitrogen atmosphere for 8 hours. After that, it was heated to 1200℃ in an atmosphere with a nitrogen to oxygen volume ratio of (90:10) at a heating rate of 2℃ / min and sintered at this atmosphere and temperature for 6 hours. Finally, it was cooled under a balanced oxygen partial pressure to obtain the manganese zinc ferrite material.

[0089] Comparative Example 1

[0090] This comparative example provides a manganese-zinc ferrite material, the preparation method of which includes the following steps:

[0091] (1) Weigh the main components of the raw material (including Fe2O3: 52.74mol%, MnO: 26.97mol%, ZnO: 20.29mol%) according to the molar percentage, and weigh the auxiliary components: Bi2O3: 100ppm based on the total weight of the main components of the raw material.

[0092] (2) The main and auxiliary components of the raw materials were ball-milled in a ball mill for 30 min and then dried. After sintering at 820℃ for 3 h, they were horizontally ball-milled for 2.2 h (the abrasive material was zirconium dioxide, and the abrasive material was divided into large balls and small balls. The diameter of the large balls was 15 mm and the diameter of the small balls was 5 mm. The mass ratio of the two was 2:1). A manganese-zinc ferrite mixture (particle size SMD 1.05-1.2 μm) was obtained.

[0093] (3) The manganese zinc ferrite mixture and PVA material obtained above are mixed at a weight ratio of 1:0.08, granulated and sieved to obtain manganese zinc ferrite precursor particles with a particle size of SMD 3.05-5.0μm.

[0094] (4) Weigh out manganese-zinc ferrite precursor particles, ethanol (solvent), trioleic acid glyceride (dispersant), dibutyl phthalate (plasticizer), and polyvinyl butyral (adhesive) in a weight ratio of 60:6:3:4:6; mix the weighed solvent and dispersant with the manganese-zinc ferrite precursor particles and zirconium balls, and ball mill for 8 hours. Then add the weighed plasticizer and adhesive and continue ball milling for 15 hours. Cast the mixture into a 18μm sheet, and then cut it into 10mm pieces. A 0mm*100mm sheet was prepared. The sheet was pressed on one side and kept at 600℃ for 4 hours in an atmosphere with a nitrogen to oxygen volume ratio of (79:21). Then, it was heated to 1000℃ in a nitrogen atmosphere for 8 hours. After that, it was heated to 1160℃ in an atmosphere with a nitrogen to oxygen volume ratio of (94:6) at a heating rate of 2℃ / min and sintered at this atmosphere and temperature for 6 hours. Finally, it was cooled under a balanced oxygen partial pressure to obtain the manganese zinc ferrite material.

[0095] Comparative Example 2

[0096] This comparative example provides a manganese-zinc ferrite material, the preparation method of which includes the following steps:

[0097] (1) Weigh the main components of the raw materials (including Fe2O3: 52.5mol%, MnO: 24.5mol%, ZnO: 23mol%) according to the molar percentage, and weigh the auxiliary components based on the total weight of the main components of the raw materials: Bi2O3: 200ppm, MoO3: 200ppm;

[0098] (2) The main and auxiliary components of the raw materials were ball-milled in a ball mill for 30 min and then dried. After sintering at 820℃ for 3 h, they were horizontally ball-milled for 2.2 h (the abrasive material was zirconium dioxide, and the abrasive material was divided into large balls and small balls. The diameter of the large balls was 15 mm and the diameter of the small balls was 5 mm. The mass ratio of the two was 2:1). A manganese-zinc ferrite mixture (particle size SMD 1.05-1.2 μm) was obtained.

[0099] (3) The manganese zinc ferrite mixture and PVA material obtained above are mixed at a weight ratio of 1:0.08, granulated and sieved to obtain manganese zinc ferrite precursor particles with a particle size of SMD 3.05-5.0μm.

[0100] (4) Weigh out manganese-zinc ferrite precursor particles, ethanol (solvent), trioleic acid glyceride (dispersant), dibutyl phthalate (plasticizer), and polyvinyl butyral (adhesive) in a weight ratio of 60:6:3:4:6; mix the weighed solvent and dispersant with the manganese-zinc ferrite precursor particles and zirconium balls, and ball mill for 8 hours. Then add the weighed plasticizer and adhesive and continue ball milling for 15 hours. Cast the mixture into a 18μm sheet, and then cut it into 10mm pieces. A 0mm*100mm sheet was prepared. The sheet was pressed on one side and kept at 600℃ for 4 hours in an atmosphere with a nitrogen to oxygen volume ratio of (79:21). Then, it was heated to 1000℃ in a nitrogen atmosphere for 8 hours. After that, it was heated to 1160℃ in an atmosphere with a nitrogen to oxygen volume ratio of (94:6) at a heating rate of 2℃ / min and sintered at this atmosphere and temperature for 6 hours. Finally, it was cooled under a balanced oxygen partial pressure to obtain the manganese zinc ferrite material.

[0101] Comparative Example 3

[0102] This comparative example provides a manganese-zinc ferrite material, the preparation method of which includes the following steps:

[0103] (1) Weigh the main components of the raw materials (including Fe2O3: 52.8mol%, MnO: 21.5mol%, ZnO: 25.7mol%) according to the molar percentage, and weigh the auxiliary components based on the total weight of the main components of the raw materials: Bi2O3: 400ppm, MoO3: 200ppm;

[0104] (2) The main and auxiliary components of the raw materials were ball-milled in a ball mill for 30 min and then dried. After sintering at 820℃ for 3 h, they were horizontally ball-milled for 2.2 h (the abrasive material was zirconium dioxide, and the abrasive material was divided into large balls and small balls. The diameter of the large balls was 15 mm and the diameter of the small balls was 5 mm. The mass ratio of the two was 2:1). A manganese-zinc ferrite mixture (particle size 1.05-1.2 μm) was obtained.

[0105] (3) The manganese zinc ferrite mixture and PVA material obtained above are mixed at a weight ratio of 1:0.08, granulated and sieved to obtain manganese zinc ferrite precursor particles with a particle size of SMD 3.05-5.0μm.

[0106] (4) Weigh out manganese-zinc ferrite precursor particles, ethanol (solvent), trioleic acid glyceride (dispersant), dibutyl phthalate (plasticizer), and polyvinyl butyral (adhesive) in a weight ratio of 60:6:3:4:6; mix the weighed solvent and dispersant with the manganese-zinc ferrite precursor particles and zirconium balls, and ball mill for 8 hours. Then add the weighed plasticizer and adhesive and continue ball milling for 15 hours. Cast the mixture into a 18μm sheet, and then cut it into 10mm pieces. A 0mm*100mm sheet was prepared. The sheet was pressed on one side and kept at 600℃ for 4 hours in an atmosphere with a nitrogen to oxygen volume ratio of (79:21). Then, it was heated to 1000℃ in a nitrogen atmosphere for 8 hours. After that, it was heated to 1160℃ in an atmosphere with a nitrogen to oxygen volume ratio of (94:6) at a heating rate of 2℃ / min and sintered at this atmosphere and temperature for 6 hours. Finally, it was cooled under a balanced oxygen partial pressure to obtain the manganese zinc ferrite material.

[0107] Comparative Example 4

[0108] This comparative example provides a manganese-zinc ferrite material, the preparation method of which includes the following steps:

[0109] (1) Weigh the main components of the raw materials (including Fe2O3: 52.27mol%, MnO: 26.97mol%, ZnO: 20.76mol%) according to the molar percentage, and weigh the auxiliary components based on the total weight of the main components of the raw materials: Bi2O3: 400ppm, MoO3: 200ppm, Co2O3: 1200ppm;

[0110] (2) The main and auxiliary components of the raw materials were ball-milled in a ball mill for 30 min and then dried. After sintering at 820℃ for 3 h, they were horizontally ball-milled for 2.2 h (the abrasive material was zirconium dioxide, and the abrasive material was divided into large balls and small balls. The diameter of the large balls was 15 mm and the diameter of the small balls was 5 mm. The mass ratio of the two was 2:1). A manganese-zinc ferrite mixture (particle size 1.05-1.2 μm) was obtained.

[0111] (3) The manganese zinc ferrite mixture and PVA material obtained above are mixed at a weight ratio of 1:0.08, granulated and sieved to obtain manganese zinc ferrite precursor particles with a particle size of SMD 3.05-5.0μm.

[0112] (4) Weigh out manganese-zinc ferrite precursor particles, ethanol (solvent), trioleic acid glyceride (dispersant), dibutyl phthalate (plasticizer), and polyvinyl butyral (adhesive) in a weight ratio of 60:6:3:4:6; mix the weighed solvent and dispersant with the manganese-zinc ferrite precursor particles and zirconium balls, and ball mill for 8 hours. Then add the weighed plasticizer and adhesive and continue ball milling for 15 hours. Cast the mixture into a 18μm sheet, and then cut it into 10mm pieces. A 0mm*100mm sheet was prepared. The sheet was pressed on one side and kept at 600℃ for 4 hours in an atmosphere with a nitrogen to oxygen volume ratio of (79:21). Then, it was heated to 1000℃ in a nitrogen atmosphere for 8 hours. After that, it was heated to 1160℃ in an atmosphere with a nitrogen to oxygen volume ratio of (94:6) at a heating rate of 2℃ / min and sintered at this atmosphere and temperature for 6 hours. Finally, it was cooled under a balanced oxygen partial pressure to obtain the manganese zinc ferrite material.

[0113] Comparative Example 5

[0114] This embodiment provides a manganese-zinc ferrite material, the preparation method of which includes the following steps:

[0115] (1) Weigh the main components of the raw materials (including Fe2O3: 51mol%, MnO: 29.21mol%, ZnO: 19.79mol%) according to the molar percentage, and weigh the auxiliary components based on the total weight of the main components of the raw materials: Bi2O3: 400ppm, MoO3: 200ppm, Co2O3: 1200ppm;

[0116] (2) The main and auxiliary components of the raw materials were ball-milled in a ball mill for 30 min and then dried. After sintering at 820℃ for 3 h, they were horizontally ball-milled for 2.2 h (the abrasive material was zirconium dioxide, and the abrasive material was divided into large balls and small balls. The diameter of the large balls was 15 mm and the diameter of the small balls was 5 mm. The mass ratio of the two was 2:1). A manganese-zinc ferrite mixture (particle size SMD 1.05-1.2 μm) was obtained.

[0117] (3) The manganese zinc ferrite mixture and PVA material obtained above are mixed at a weight ratio of 1:0.08, granulated and sieved to obtain manganese zinc ferrite precursor particles with a particle size of SMD 3.05-5.0μm.

[0118] (4) Weigh out manganese-zinc ferrite precursor particles, ethanol (solvent), trioleic acid glyceride (dispersant), dibutyl phthalate (plasticizer), and polyvinyl butyral (adhesive) in a weight ratio of 60:6:3:4:6; mix the weighed solvent and dispersant with the manganese-zinc ferrite precursor particles and zirconium balls, and ball mill for 8 hours. Then add the weighed plasticizer and adhesive and continue ball milling for 15 hours. Cast the mixture into a 18μm sheet, and then cut it into 10mm pieces. A 0mm*100mm sheet was prepared. The sheet was pressed on one side and kept at 600℃ for 4 hours in an atmosphere with a nitrogen to oxygen volume ratio of (79:21). Then, it was heated to 1000℃ in a nitrogen atmosphere for 8 hours. After that, it was heated to 1160℃ in an atmosphere with a nitrogen to oxygen volume ratio of (94:6) at a heating rate of 2℃ / min and sintered at this atmosphere and temperature for 6 hours. Finally, it was cooled under a balanced oxygen partial pressure to obtain the manganese zinc ferrite material.

[0119] Comparative Example 6

[0120] This embodiment provides a manganese-zinc ferrite material, the preparation method of which includes the following steps:

[0121] (1) Weigh the main components of the raw materials (including Fe2O3: 52.27mol%, MnO: 29.21mol%, ZnO: 18.52mol%) according to the molar percentage, and weigh the auxiliary components based on the total weight of the main components of the raw materials: Bi2O3: 1200ppm, MoO3: 600ppm;

[0122] (2) The main and auxiliary components of the raw materials were ball-milled in a ball mill for 30 min and then dried. After sintering at 820℃ for 3 h, they were horizontally ball-milled for 2.2 h (the abrasive material was zirconium dioxide, and the abrasive material was divided into large balls and small balls. The diameter of the large balls was 15 mm and the diameter of the small balls was 5 mm. The mass ratio of the two was 2:1). A manganese-zinc ferrite mixture (particle size SMD 1.05-1.2 μm) was obtained.

[0123] (3) The manganese zinc ferrite mixture and PVA material obtained above are mixed at a weight ratio of 1:0.08, granulated and sieved to obtain manganese zinc ferrite precursor particles with a particle size of SMD 3.05-5.0μm.

[0124] (4) Weigh out manganese-zinc ferrite precursor particles, ethanol (solvent), trioleic acid glyceride (dispersant), dibutyl phthalate (plasticizer), and polyvinyl butyral (adhesive) in a weight ratio of 60:6:3:4:6; mix the weighed solvent and dispersant with the manganese-zinc ferrite precursor particles and zirconium balls, and ball mill for 8 hours. Then add the weighed plasticizer and adhesive and continue ball milling for 15 hours. Cast the mixture into a 18μm sheet, and then cut it into 10mm pieces. A 0mm*100mm sheet was prepared. The sheet was pressed on one side and kept at 600℃ for 4 hours in an atmosphere with a nitrogen to oxygen volume ratio of (79:21). Then, it was heated to 1000℃ in a nitrogen atmosphere for 8 hours. After that, it was heated to 1160℃ in an atmosphere with a nitrogen to oxygen volume ratio of (94:6) at a heating rate of 2℃ / min and sintered at this atmosphere and temperature for 6 hours. Finally, it was cooled under a balanced oxygen partial pressure to obtain the manganese zinc ferrite material.

[0125] Comparative Example 7

[0126] This embodiment provides a manganese-zinc ferrite material, the preparation method of which includes the following steps:

[0127] (1) Weigh the main components of the raw materials (including Fe2O3: 52.27mol%, MnO: 29.21mol%, ZnO: 18.52mol%) according to the molar percentage, and weigh the auxiliary components based on the total weight of the main components of the raw materials: MoO3: 257ppm, Co2O3: 1543ppm;

[0128] (2) The main and auxiliary components of the raw materials were ball-milled in a ball mill for 30 min and then dried. After sintering at 820℃ for 3 h, they were horizontally ball-milled for 2.2 h (the abrasive material was zirconium dioxide, and the abrasive material was divided into large balls and small balls. The diameter of the large balls was 15 mm and the diameter of the small balls was 5 mm. The mass ratio of the two was 2:1). A manganese-zinc ferrite mixture (particle size SMD 1.05-1.2 μm) was obtained.

[0129] (3) The manganese zinc ferrite mixture and PVA material obtained above are mixed at a weight ratio of 1:0.08, granulated and sieved to obtain manganese zinc ferrite precursor particles with a particle size of SMD 3.05-5.0μm.

[0130] (4) Weigh out manganese-zinc ferrite precursor particles, ethanol (solvent), trioleic acid glyceride (dispersant), dibutyl phthalate (plasticizer), and polyvinyl butyral (adhesive) in a weight ratio of 60:6:3:4:6; mix the weighed solvent and dispersant with the manganese-zinc ferrite precursor particles and zirconium balls, and ball mill for 8 hours. Then add the weighed plasticizer and adhesive and continue ball milling for 15 hours. Cast the mixture into a 18μm sheet, and then cut it into 10mm pieces. A 0mm*100mm sheet was prepared. The sheet was pressed on one side and kept at 600℃ for 4 hours in an atmosphere with a nitrogen to oxygen volume ratio of (79:21). Then, it was heated to 1000℃ in a nitrogen atmosphere for 8 hours. After that, it was heated to 1160℃ in an atmosphere with a nitrogen to oxygen volume ratio of (94:6) at a heating rate of 2℃ / min and sintered at this atmosphere and temperature for 6 hours. Finally, it was cooled under a balanced oxygen partial pressure to obtain the manganese zinc ferrite material.

[0131] Comparative Example 8

[0132] This comparative example provides a manganese-zinc ferrite material, the preparation method of which includes the following steps:

[0133] (1) Weigh the main components of the raw materials (including Fe2O3: 52.27mol%, MnO: 29.21mol%, ZnO: 18.52mol%) according to the molar percentage, and weigh the auxiliary components based on the total weight of the main components of the raw materials: Bi2O3: 450ppm, Co2O3: 1350ppm;

[0134] (2) The main and auxiliary components of the raw materials were ball-milled in a ball mill for 30 min and then dried. After sintering at 820℃ for 3 h, they were horizontally ball-milled for 2.2 h (the abrasive material was zirconium dioxide, and the abrasive material was divided into large balls and small balls. The diameter of the large balls was 15 mm and the diameter of the small balls was 5 mm. The mass ratio of the two was 2:1). A manganese-zinc ferrite mixture (particle size SMD 1.05-1.2 μm) was obtained.

[0135] (3) The manganese zinc ferrite mixture and PVA material obtained above are mixed at a weight ratio of 1:0.08, granulated and sieved to obtain manganese zinc ferrite precursor particles with a particle size of SMD 3.05-5.0μm.

[0136] (4) Weigh out manganese-zinc ferrite precursor particles, ethanol (solvent), trioleic acid glyceride (dispersant), dibutyl phthalate (plasticizer), and polyvinyl butyral (adhesive) in a weight ratio of 60:6:3:4:6; mix the weighed solvent and dispersant with the manganese-zinc ferrite precursor particles and zirconium balls, and ball mill for 8 hours. Then add the weighed plasticizer and adhesive and continue ball milling for 15 hours. Cast the mixture into a 18μm sheet, and then cut it into 10mm pieces. A 0mm*100mm sheet was prepared. The sheet was pressed on one side and kept at 600℃ for 4 hours in an atmosphere with a nitrogen to oxygen volume ratio of (79:21). Then, it was heated to 1000℃ in a nitrogen atmosphere for 8 hours. After that, it was heated to 1160℃ in an atmosphere with a nitrogen to oxygen volume ratio of (94:6) at a heating rate of 2℃ / min and sintered at this atmosphere and temperature for 6 hours. Finally, it was cooled under a balanced oxygen partial pressure to obtain the manganese zinc ferrite material.

[0137] Comparative Example 9

[0138] This comparative example provides a manganese-zinc ferrite material, the preparation method of which includes the following steps:

[0139] (1) Weigh the main components of the raw materials (including Fe2O3: 52.27mol%, MnO: 29.21mol%, ZnO: 18.52mol%) according to the molar percentage, and weigh the auxiliary components based on the total weight of the main components of the raw materials: Bi2O3: 2200ppm, MoO3: 200ppm, Co2O3: 1200ppm;

[0140] (2) The main and auxiliary components of the raw materials were ball-milled in a ball mill for 30 min and then dried. After sintering at 820℃ for 3 h, they were horizontally ball-milled for 2.2 h (the abrasive material was zirconium dioxide, and the abrasive material was divided into large balls and small balls. The diameter of the large balls was 15 mm and the diameter of the small balls was 5 mm. The mass ratio of the two was 2:1). A manganese-zinc ferrite mixture (particle size SMD 1.05-1.2 μm) was obtained.

[0141] (3) The manganese zinc ferrite mixture and PVA material obtained above are mixed at a weight ratio of 1:0.08, granulated and sieved to obtain manganese zinc ferrite precursor particles with a particle size of SMD 3.05-5.0μm.

[0142] (4) Weigh out manganese-zinc ferrite precursor particles, ethanol (solvent), trioleic acid glyceride (dispersant), dibutyl phthalate (plasticizer), and polyvinyl butyral (adhesive) in a weight ratio of 60:6:3:4:6; mix the weighed solvent and dispersant with the manganese-zinc ferrite precursor particles and zirconium balls, and ball mill for 8 hours. Then add the weighed plasticizer and adhesive and continue ball milling for 15 hours. Cast the mixture into a 18μm sheet, and then cut it into 10mm pieces. A 0mm*100mm sheet was prepared. The sheet was pressed on one side and kept at 600℃ for 4 hours in an atmosphere with a nitrogen to oxygen volume ratio of (79:21). Then, it was heated to 1000℃ in a nitrogen atmosphere for 8 hours. After that, it was heated to 1160℃ in an atmosphere with a nitrogen to oxygen volume ratio of (94:6) at a heating rate of 2℃ / min and sintered at this atmosphere and temperature for 6 hours. Finally, it was cooled under a balanced oxygen partial pressure to obtain the manganese zinc ferrite material.

[0143] Comparative Example 10

[0144] This comparative example provides a manganese-zinc ferrite material, the preparation method of which includes the following steps:

[0145] (1) Weigh the main components of the raw materials (including Fe2O3: 52.27mol%, MnO: 29.21mol%, ZnO: 18.52mol%) according to the molar percentage, and weigh the auxiliary components based on the total weight of the main components of the raw materials: Bi2O3: 400ppm, MoO3: 2200ppm, Co2O3: 1200ppm;

[0146] (2) The main and auxiliary components of the raw materials were ball-milled in a ball mill for 30 min and then dried. After sintering at 820℃ for 3 h, they were horizontally ball-milled for 2.2 h (the abrasive material was zirconium dioxide, and the abrasive material was divided into large balls and small balls. The diameter of the large balls was 15 mm and the diameter of the small balls was 5 mm. The mass ratio of the two was 2:1). A manganese-zinc ferrite mixture (particle size SMD 1.05-1.2 μm) was obtained.

[0147] (3) The manganese zinc ferrite mixture and PVA material obtained above are mixed at a weight ratio of 1:0.08, granulated and sieved to obtain manganese zinc ferrite precursor particles with a particle size of SMD 3.05-5.0μm.

[0148] (4) Weigh out manganese-zinc ferrite precursor particles, ethanol (solvent), trioleic acid glyceride (dispersant), dibutyl phthalate (plasticizer), and polyvinyl butyral (adhesive) in a weight ratio of 60:6:3:4:6; mix the weighed solvent and dispersant with the manganese-zinc ferrite precursor particles and zirconium balls, and ball mill for 8 hours. Then add the weighed plasticizer and adhesive and continue ball milling for 15 hours. Cast the mixture into a 18μm sheet, and then cut it into 10mm pieces. A 0mm*100mm sheet was prepared. The sheet was pressed on one side and kept at 600℃ for 4 hours in an atmosphere with a nitrogen to oxygen volume ratio of (79:21). Then, it was heated to 1000℃ in a nitrogen atmosphere for 8 hours. After that, it was heated to 1160℃ in an atmosphere with a nitrogen to oxygen volume ratio of (94:6) at a heating rate of 2℃ / min and sintered at this atmosphere and temperature for 6 hours. Finally, it was cooled under a balanced oxygen partial pressure to obtain the manganese zinc ferrite material.

[0149] Comparative Example 11

[0150] This comparative example provides a manganese-zinc ferrite material, the preparation method of which includes the following steps:

[0151] (1) Weigh the main components of the raw materials (including Fe2O3: 52.27 mol%, MnO: 29.21 mol%, ZnO: 18.52 mol%) according to molar percentage;

[0152] (2) The main components of the raw material were ball-milled in a ball mill for 30 min and then dried. After sintering at 820℃ for 3 h, they were horizontally ball-milled for 2.2 h (the abrasive material was zirconium dioxide, and the abrasive material was divided into large balls and small balls. The diameter of the large balls was 15 mm and the diameter of the small balls was 5 mm. The mass ratio of the two was 2:1). A manganese-zinc ferrite mixture (particle size SMD 1.05-1.2 μm) was obtained.

[0153] (3) The manganese zinc ferrite mixture and PVA material obtained above are mixed at a weight ratio of 1:0.08, granulated and sieved to obtain manganese zinc ferrite precursor particles with a particle size of SMD 3.05-5.0μm.

[0154] (4) Weigh out manganese-zinc ferrite precursor particles, ethanol (solvent), trioleic acid glyceride (dispersant), dibutyl phthalate (plasticizer), and polyvinyl butyral (adhesive) in a weight ratio of 60:6:3:4:6; mix the weighed solvent and dispersant with the manganese-zinc ferrite precursor particles and zirconium balls, and ball mill for 8 hours. Then add the weighed plasticizer and adhesive and continue ball milling for 15 hours. Cast the mixture into a 18μm sheet, and then cut it into 10mm pieces. A 0mm*100mm sheet was prepared. The sheet was pressed on one side and kept at 600℃ for 4 hours in an atmosphere with a nitrogen to oxygen volume ratio of (79:21). Then, it was heated to 1000℃ in a nitrogen atmosphere for 8 hours. After that, it was heated to 1160℃ in an atmosphere with a nitrogen to oxygen volume ratio of (94:6) at a heating rate of 2℃ / min and sintered at this atmosphere and temperature for 6 hours. Finally, it was cooled under a balanced oxygen partial pressure to obtain the manganese zinc ferrite material.

[0155] Test case

[0156] After the manganese-zinc ferrite materials prepared in the examples and comparative examples were subjected to crack tests, μ' and μ” were measured using an Agilent E4991A impedance analyzer; the results are shown in Table 1.

[0157] Table 1

[0158]

[0159]

[0160] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A manganese-zinc ferrite material, characterized in that, Raw materials include main components and auxiliary components; The main components include 52.0~53.0 mol% Fe2O3, 18.0~19.0 mol% ZnO, and 28.0~29.5 mol% MnO; Based on the total weight of the main components: auxiliary components include 100~2000ppm of Co2O3; 100~1000ppm of Bi2O3; and 100~2000ppm of MoO3; Includes the following steps: (1) Mix the main components and auxiliary components in the raw materials, pre-sinter, and ball mill them to obtain a manganese-zinc ferrite mixture; (2) The manganese zinc ferrite mixture is mixed with a binder, granulated, and sieved to obtain manganese zinc ferrite precursor particles; (3) The solvent, dispersant, manganese zinc ferrite precursor particles, plasticizer and glue are mixed and then cast and sintered to obtain the manganese zinc ferrite material.

2. A method for preparing the manganese-zinc ferrite material according to claim 1, characterized in that, Includes the following steps: (1) Mix the main components and auxiliary components in the raw materials, pre-sinter, and ball mill them to obtain a manganese-zinc ferrite mixture; (2) The manganese zinc ferrite mixture is mixed with a binder, granulated, and sieved to obtain manganese zinc ferrite precursor particles; (3) The solvent, dispersant, manganese zinc ferrite precursor particles, plasticizer and glue are mixed and then cast and sintered to obtain the manganese zinc ferrite material. The pre-sintering temperature is 700-850℃; the pre-sintering time is 2.5-3.5h; In step (3), the sintering temperature is 1000-1200℃.

3. The method for preparing the manganese-zinc ferrite material according to claim 2, characterized in that, In step (1), the particle size of the manganese-zinc ferrite mixture is SMD 1.05-1.2μm.

4. The method for preparing the manganese-zinc ferrite material according to claim 2, characterized in that, The first ball milling time is 2-3 hours.

5. The method for preparing the manganese-zinc ferrite material according to claim 2, characterized in that, In step (2), the mass ratio of the manganese-zinc ferrite mixture to the binder is 1:(0.06-0.09).

6. The method for preparing the manganese-zinc ferrite material according to claim 2, characterized in that, The adhesive includes polyvinyl alcohol.

7. The method for preparing manganese-zinc ferrite material according to claim 2, characterized in that, The particle size of the manganese zinc ferrite precursor obtained after sieving is 3.05-5.6 μm (SMD).

8. The method for preparing the manganese-zinc ferrite material according to claim 2, characterized in that, In step (3), the mass ratio of manganese zinc ferrite precursor particles, solvent, dispersant, plasticizer and glue is (50-70): (5.5-7.5): (2.5-3.5): (3.5-4.5): (5.5-7.5).

9. The method for preparing the manganese-zinc ferrite material according to claim 2, characterized in that, The process of mixing solvent, dispersant, manganese zinc ferrite precursor particles, plasticizer, and glue involves a second ball milling of the solvent, dispersant, and manganese zinc ferrite precursor particles, followed by the addition of plasticizer and glue for a third ball milling.

10. The method for preparing the manganese-zinc ferrite material according to claim 2, characterized in that, The solvent is selected from at least one of methanol, ethanol, and acetone.

11. The method for preparing the manganese-zinc ferrite material according to claim 2, characterized in that, The dispersant is selected from at least one of trioleic acid glyceride and fish oil.

12. The method for preparing the manganese-zinc ferrite material according to claim 2, characterized in that, The plasticizer is selected from at least one of dibutyl phthalate, polyethylene glycol, and glycerol.

13. The method for preparing the manganese-zinc ferrite material according to claim 2, characterized in that, The adhesive is selected from at least one of polymethyl methacrylate and polyvinyl butyral.

14. The method for preparing the manganese-zinc ferrite material according to claim 9, characterized in that, The second ball milling time is 4-8 hours.

15. The method for preparing the manganese-zinc ferrite material according to claim 9, characterized in that, The third ball milling time is 12-24 hours.

16. The method for preparing the manganese-zinc ferrite material according to claim 2, characterized in that, The thickness of the cast film obtained by casting is 18-40μm.

17. The method for preparing the manganese-zinc ferrite material according to claim 2, characterized in that, The process of casting and sintering also includes a cutting process.

18. The method for preparing the manganese-zinc ferrite material according to claim 17, characterized in that, The cut casting sheet is a rectangle with a length of 50-150mm and a width of 50-150mm.

19. The method for preparing manganese-zinc ferrite material according to claim 2, characterized in that, In step (3), the tape is pressed and released on one side during the sintering process.

20. The method for preparing the manganese-zinc ferrite material according to claim 2, characterized in that, The sintering atmosphere in step (3) includes nitrogen and oxygen, wherein the oxygen content in the sintering atmosphere is 3~21 vol%.

21. The method for preparing the manganese-zinc ferrite material according to claim 2, characterized in that, In step (3), the sintering process involves first heating to the first temperature, and then heating to the second temperature and holding for 2-6 hours.

22. The method for preparing manganese-zinc ferrite material according to claim 21, characterized in that, In step (3), the first temperature is 1000-1100℃ and the second temperature is 1130-1200℃.

23. The method for preparing manganese-zinc ferrite material according to claim 21, characterized in that, The heating rate from the first temperature to the second temperature is 1.5-3℃ / min.

24. The method for preparing the manganese-zinc ferrite material according to claim 2, characterized in that, Step (3) includes a pre-sintering process after casting and before sintering; the pre-sintering process is to pre-sinter at 550-650℃ for 2-4 hours; the pre-sintering atmosphere includes nitrogen and oxygen, wherein the oxygen content in the sintering atmosphere is 19-21 vol.

25. The method for preparing the manganese-zinc ferrite material according to claim 2, characterized in that, The heating process from the pre-sintering temperature to the first temperature takes 6-8 hours; the atmosphere during the heating process is nitrogen.

26. The method for preparing the manganese-zinc ferrite material according to claim 2, characterized in that, Step (3) includes a cooling process after sintering, which is carried out under balanced oxygen partial pressure.

27. A wireless charging device, characterized in that, The wireless charging device includes the manganese-zinc ferrite material as described in claim 1 or the manganese-zinc ferrite material prepared by the preparation method of any one of claims 2-26.

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