Composite ferrite, preparation method thereof, circulator and application

Abstract

The invention belongs to the technical field of ferrite preparation, and particularly relates to a composite ferrite, a preparation method thereof, a circulator and application. The surface center magnetic field intensity of the composite ferrite is 1150Gs to 110Gs, and the center saturation magnetization intensity of the composite ferrite is 1500Gs to 1600Gs. The composite ferrite, the gyromagnetic ferrite, the permanent magnetic ferrite and the like provided by the invention are integrated into a whole, so that the technical problems of damage, high production cost and the like caused by using a gyromagnetic ferrite sheet and a permanent magnetic ferrite sheet are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of ferrite preparation, and in particular relates to a composite ferrite and a preparation method thereof, a circulator and applications. Background Art

[0002] Circulators can transmit high-frequency signals unidirectionally, performing functions such as circulation, isolation, and amplitude modulation in microwave circuits. They are primarily used in military radar systems and communications. With the large-scale construction of 5G base stations in recent years, the demand for circulators has increased significantly, placing higher demands on their production cost and reliability.

[0003] Existing circulators, such as the attached Figure 1 As shown, it includes a shell (7), a center conductor (1), a rotating ferrite sheet (2), a grounding sheet (3), an anti-rotation member (4), a permanent ferrite sheet (5) and a cover plate (6). The cover plate (6) and the shell (7) form a cavity, and the rotating ferrite sheet, the permanent ferrite sheet, the center conductor, etc. are placed in the cavity. In the above structure: the rotating ferrite sheet and the permanent ferrite sheet are both thin sheet structures. When assembled into a circulator, they need to be stacked layer by layer with metal sheets, which are easy to be damaged during production, transportation and assembly. The layer-by-layer stacking method makes it have strict requirements on the flatness of the surface grinding of the rotating ferrite sheet and the permanent ferrite sheet. At the same time, electroplating is performed on the surface of the rotating ferrite sheet and the permanent ferrite sheet, which has high production costs and is easy to cause environmental pollution. Summary of the Invention

[0004] To address the above-mentioned issues, the present invention provides a composite ferrite, a preparation method thereof, a circulator, and its application. In the composite ferrite, gyromagnetic ferrite and permanent ferrite are integrated into one body, resolving the aforementioned technical issues of breakage and high production costs associated with using gyromagnetic ferrite and permanent ferrite sheets.

[0005] The present invention is achieved through the following technical solutions: In a first aspect, the present invention provides a composite ferrite having a surface center magnetic field intensity of 1150Gs-1170Gs and a center saturation magnetization intensity of 1500Gs-1600Gs.

[0006] In some possible implementations, the composite ferrite includes a permanent magnetic ferrite layer, a rotating magnetic ferrite layer, and a central conductor; The central conductor is located on one side of the gyromagnetic ferrite layer; The permanent ferrite layer is located on the other side of the rotating ferrite layer away from the central conductor.

[0007] In some possible implementations, the raw materials of the permanent magnetic ferrite layer include magnetic material blocks and a first auxiliary agent.

[0008] In some possible implementations, the raw materials of the gyromagnetic ferrite layer include YIG ferrite pre-sintered material, bismuth oxide, and a second auxiliary agent.

[0009] In some possible implementations, the raw material of the magnetic block includes pre-sintered permanent magnet ferrite material.

[0010] In some possible implementations, the raw materials of the magnetic material block further include calcium carbonate, silicon dioxide, boric acid and calcium gluconate.

[0011] In some possible implementations, the mass ratio of the magnetic material block to the first auxiliary agent is 1:(0.01-0.02).

[0012] In some possible implementations, the mass ratio of the YIG ferrite pre-sintered material, the calcium carbonate, the silicon dioxide, the boric acid, and the calcium gluconate is 1:(0.005-0.007):(0.002-0.004):(0.002-0.004):(0.005-0.007).

[0013] In some possible implementations, the mass ratio of the YIG ferrite pre-sintered material, the bismuth oxide, and the second auxiliary agent is 1:(0.005-0.015):(0.01-0.02).

[0014] In some possible implementations, the YIG ferrite pre-sintered material includes the following raw materials: Y2O3, Fe2O3, SnO2, Bi2O3, and CaCO3.

[0015] In a second aspect, the present invention provides a method for preparing the composite ferrite, comprising the following steps: The permanent magnet ferrite molding material, the rotary magnet ferrite molding material and the central conductor are composited to obtain the composite ferrite.

[0016] In some possible implementations, the composite processing includes the following steps: The permanent magnet ferrite molding material, the rotary magnet ferrite molding material and the central conductor are made into a composite ferrite molding and then sintered.

[0017] In some possible implementations, the preparation of the composite ferrite formed body includes the following steps: The permanent magnet ferrite molding material, the rotary magnet ferrite molding material and the central conductor are press-molded under a strong magnetic field.

[0018] In a third aspect, the present invention provides a circulator comprising the above-mentioned composite ferrite.

[0019] In a fourth aspect, the present invention provides an application of the above-mentioned circulator in the field of communications.

[0020] The composite ferrite, preparation method thereof, and circulator provided by the present invention have at least the following beneficial technical effects compared with the prior art: (1) The composite ferrite provided by the present invention comprises a permanent ferrite, a gyromagnetic ferrite and a central conductor as a whole and can be directly used in a circulator without the need for stacking layers of thin-sheet structures, thereby avoiding unnecessary losses caused by breakage of the permanent ferrite and gyromagnetic ferrite during production, transportation and assembly.

[0021] (2) The preparation method of the composite ferrite provided by the present invention forms the permanent magnetic ferrite, the rotating magnetic ferrite and the central conductor into one piece, eliminating the processes of flat grinding of the sheet and surface electroplating. The method is simple and easy to implement, which reduces the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present drawings or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present drawings. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0023] Figure 1 A schematic structural diagram of a circulator provided in the background technology of the present invention; Figure 2 Schematic diagram of the structure of the composite ferrite provided in an embodiment of the present invention.

[0024] Explanation of the accompanying drawings: 1-center conductor, 2-rotating ferrite sheet, 3-grounding sheet, 4-anti-rotation part, 5-permanent ferrite sheet, 6-cover plate, 7-housing, 221-first rotating ferrite layer, 222-second rotating ferrite layer, 231-first permanent ferrite layer, 232-second permanent ferrite layer.

[0025] The purpose, features and advantages of this drawing will be further described with reference to the accompanying drawings in conjunction with the embodiments. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is described and illustrated below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention. Based on the embodiments provided by the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work are within the scope of protection of the present invention.

[0027] Obviously, the following descriptions are merely examples or embodiments of the present invention, and those skilled in the art will be able to apply the present invention to other similar scenarios without inventive effort. Furthermore, it is understood that while the effort involved in such a development process may be complex and lengthy, for those skilled in the art related to the present disclosure, any design, manufacturing, or production changes based on the technical content disclosed in the present disclosure are merely conventional technical means and should not be construed as an inadequacy of the present disclosure.

[0028] However, unnecessary detailed descriptions may be omitted. For example, detailed descriptions of well-known matters or repeated descriptions of substantially identical structures may be omitted. This is to avoid unnecessary redundancy in the following description and to facilitate understanding by those skilled in the art. Furthermore, the following description is provided to facilitate a thorough understanding of the present invention by those skilled in the art and is not intended to limit the subject matter recited in the claims.

[0029] Unless otherwise specified, all embodiments and optional embodiments of the present invention can be combined with each other to form a new technical solution, and all technical features and optional technical features of the present invention can be combined with each other to form a new technical solution.

[0030]

Compound ferrite

[0031] The composite ferrite provided by embodiments of the present invention has a surface center magnetic field strength after magnetization that ensures the gyromagnetic properties of the ferrite layer at microwave frequencies, resulting in excellent unidirectional signal transmission characteristics. The central saturation magnetization intensity also provides the composite ferrite with good signal transmission sensitivity and low high-frequency loss. The composite ferrite provided by embodiments of the present invention is suitable for high-frequency / millimeter-wave circulators.

[0032] In some embodiments, the composite ferrite includes a permanent magnetic ferrite layer, a rotary magnetic ferrite layer, and a center conductor; The central conductor is located on one side of the gyromagnetic ferrite layer; The permanent ferrite layer is located on the other side of the rotating ferrite layer away from the central conductor.

[0033] In some embodiments, the composite ferrite includes a first permanent ferrite layer, a first gyromagnetic ferrite layer, a central conductor, a second gyromagnetic ferrite layer, and a second permanent ferrite layer connected in sequence.

[0034] In some embodiments, the raw materials of the permanent magnetic ferrite layer include magnetic material blocks and a first auxiliary agent; The mass ratio of the magnetic material block to the first additive is 1:(0.01~0.02).

[0035] In some embodiments, the first auxiliary agent includes at least one of a binder and a lubricant.

[0036] In some embodiments, the binder includes at least one of camphor powder, polyvinyl alcohol, and methyl cellulose.

[0037] In some embodiments, the lubricant includes at least one of calcium stearate, paraffin, and polyethylene glycol.

[0038] In some embodiments, the raw material of the magnetic block includes pre-sintered permanent magnet ferrite.

[0039] In some embodiments, the raw materials of the magnetic material block further include calcium carbonate, silicon dioxide, boric acid and calcium gluconate; The mass ratio of the permanent magnet ferrite pre-sintered material, calcium carbonate, silicon dioxide, boric acid and calcium gluconate is 1: (0.005-0.007): (0.002-0.004): (0.002-0.004): (0.005-0.007).

[0040] In some embodiments, the grade of the permanent ferrite pre-sintered material is Y40.

[0041] In some embodiments, the thickness of the permanent ferrite layer is 1 mm to 3 mm.

[0042] In some embodiments, the raw materials of the spin-magnetic ferrite layer include YIG ferrite pre-sintered material, bismuth oxide and a second auxiliary agent; The mass ratio of YIG ferrite pre-sintered material, bismuth oxide and the second additive is 1: (0.005~0.015): (0.01~0.02).

[0043] In some embodiments, the YIG ferrite pre-sintered material includes the following raw materials: Y2O3, Fe2O3, SnO2, Bi2O3, and CaCO3.

[0044] In some embodiments, the molar ratio of Y2O3:Fe2O3:SnO2:Bi2O3:CaCO3 is (13-13.5):(20.5-21):(2.2-2.6):1:(2.2-2.6).

[0045] In some embodiments, the thickness of the spin-magnetic ferrite layer is 0.2 mm to 2 mm.

[0046] In some embodiments, the second auxiliary agent includes at least one of a binder and a lubricant.

[0047] In some embodiments, the center conductor is a Y-shaped center conductor.

[0048] In some embodiments, the Y-shaped center conductor comprises a tungsten-copper alloy.

[0049] In some embodiments, the tungsten copper alloy includes the following components by mass fraction: Copper 40%~50%, tungsten 50%~60%.

[0050] In some specific embodiments, the tungsten copper alloy is designated CuW50.

[0051] In some embodiments, the thickness of the center conductor is 0.2 mm to 1 mm.

[0052]

Preparation method of composite ferrite

[0053] In some embodiments, in the above step S10, the preparation of the permanent magnet ferrite molding material includes the following steps: S101. Prepare magnetic material blocks.

[0054] S102. Perform a first mixing process on the magnetic material block and the first auxiliary agent to obtain a permanent magnet ferrite molding material.

[0055] In some embodiments, in the above step S101, preparing the magnetic material block includes the following steps: S1011. The mixture is subjected to wet ball milling to obtain a permanent magnet ferrite slurry; wherein the mixture comprises a permanent magnet ferrite pre-sintered material, calcium carbonate, silicon dioxide, boric acid and calcium gluconate.

[0056] S1012. Perform wet pressing on the permanent magnet ferrite slurry to obtain a permanent magnet ferrite green body.

[0057] S1013. The permanent magnet ferrite green body is subjected to a water removal treatment to obtain a magnetic material block.

[0058] In some embodiments, in the above step S1011, during the wet ball milling process, the mass ratio of the ball to water is 1:(3-5):(1.5-3).

[0059] In some embodiments, in the wet ball milling process in step S1011, the ball milling time is 11 hours to 13 hours.

[0060] In some embodiments, in step S1011, the average particle size of the permanent magnet ferrite slurry is 0.8 μm to 1.0 μm. In this case, the powder is easily oriented in the forming magnetic field and has good activity and sintering controllability.

[0061] In some embodiments, in step S1012, the wet pressing process includes: S10121. Under magnetic field conditions, press the permanent magnet ferrite slurry into a preset shape.

[0062] In some embodiments, in the above step S10121, the magnetic field strength is (8.9-9.1)×10 3 Oe.

[0063] In some embodiments, in the above step S10121, the pressing pressure is 12 MPa~16 MPa.

[0064] In some embodiments, in the above step S10121, the pressing time is 30s~60s.

[0065] In some embodiments, in the above step S1013, the water removal process includes the following steps: S10131. Dry the permanent magnet ferrite green body at 190°C~210°C.

[0066] In some embodiments, in the above step S10131, the drying time is 5 hours to 6 hours.

[0067] In some embodiments, in step S1013, the water content of the magnetic material block is below 0.3%. In this case, the powder dispersion effect can be ensured while preventing sintering cracking.

[0068] In some embodiments, in the above step S102, the first mixing process includes: S1021. The magnetic material block and the first auxiliary agent are mixed and dispersed and then sieved.

[0069] In some embodiments, in the above step S1021, the mixing and dispersing step includes: S10211. Use a crusher to mix, disperse and crush the magnetic material block and the first auxiliary agent.

[0070] In some embodiments, in the above step S10211, the time for dispersing and crushing is 2 minutes to 4 minutes.

[0071] In some embodiments, in the above step S1021, the mesh size of the sieving is 55 mesh to 65 mesh.

[0072] In some embodiments, in the above step S10, the preparation of the spinning ferrite molding material includes the following steps: S103. Prepare YIG ferrite pre-sintered material.

[0073] S104. The YIG ferrite pre-sintered material, bismuth oxide and the second auxiliary agent are subjected to a second mixing process to obtain a gyromagnetic ferrite molding material.

[0074] In some embodiments, in the above step S103, preparing the YIG ferrite pre-sintered material includes the following steps: S1031. Mix the raw materials of the YIG ferrite pre-sintered material, perform a wet ball milling process, and then sinter.

[0075] In some embodiments, in the above step S1031, in one wet ball milling process, the mass ratio of ball material to water is 1: (5-7): (2-4).

[0076] In some embodiments, in the above step S1031, the ball milling time in one wet ball milling process is 11 hours to 13 hours.

[0077] In some embodiments, in the above step S1031 , the sintering temperature is 1190° C. to 1210° C.

[0078] In some embodiments, in the above step S1031 , the sintering atmosphere is an oxygen atmosphere.

[0079] In some embodiments, in the above step S1031, the sintering time is 2 hours to 3 hours.

[0080] In some embodiments, in the above step S103, the preparation of the YIG ferrite pre-sintered material further includes a post-processing step of coarsely crushing the sintered product.

[0081] In some embodiments, in the above step S104, the second mixing process includes the following steps: S1041. The YIG ferrite pre-sintered material and bismuth oxide are subjected to a secondary wet ball milling process and then dried to obtain a gyromagnetic ferrite mixture.

[0082] S1042. The magnetic ferrite mixture and the second auxiliary agent are mixed and dispersed, and then sieved.

[0083] In some embodiments, in the above step S1041, in the secondary wet ball milling process, the mass ratio of ball material to water is 1: (5-7): (2-4).

[0084] In some embodiments, in the above step S1041, the ball milling time in the secondary wet ball milling treatment is 11 hours to 13 hours.

[0085] In some embodiments, in the above step S1041 , during the secondary wet ball milling process, the average particle size of the slurry obtained by ball milling is 0.7 μm to 0.9 μm.

[0086] In some embodiments, during the drying process in step S1041, the drying temperature is between 180°C and 220°C. In some embodiments, after drying in step S1041, the water content of the ferrite mixture is less than 0.3%. In this case, the powder dispersion is ensured while preventing sintering cracking.

[0087] In some embodiments, in the above step S10, the composite process includes the following steps: S105. Form a composite ferrite molding body by combining the permanent magnet ferrite molding material, the rotary magnet ferrite molding material and the central conductor, and then sinter the composite ferrite molding body.

[0088] In some embodiments, in the above step S105, the preparation of the composite ferrite formed body includes the following steps: S1051. Perform a first pressing process on the gyromagnetic ferrite molding material and the central conductor to obtain a pre-molded body.

[0089] S1052. Under a strong magnetic field, the preformed body and the permanent magnet ferrite molding material are subjected to a second pressing process to obtain a composite ferrite molding.

[0090] In some embodiments, in the above step S1051, in the first pressing process, the pressing pressure is 14 MPa to 16 MPa.

[0091] In some embodiments, in the above step S1051, in the first pressing process, the pressing time is 10 to 60 seconds.

[0092] In some embodiments, in the above step S1051, the preformed body is a cylinder with a bottom diameter of 10 mm to 20 mm.

[0093] In some embodiments, in the above step S1052, the diameter of the composite ferrite formed body is 0.1-0.5 mm larger than the diameter of the preceding formed body.

[0094] In some embodiments, in the above step S1052, the magnetic field strength of the strong magnetic field is 8×10 3 Oe and above.

[0095] In some embodiments, in the above step S1052 , the strong magnetic field is an axially parallel magnetic field.

[0096] In some embodiments, in the above step S1052, in the second pressing process, the pressing pressure is 14 MPa to 16 MPa.

[0097] In some embodiments, in the above step S1052, in the second pressing process, the pressing time is 15s~17s.

[0098] In some embodiments, in the above step S105 , the maximum sintering temperature is 1170° C. to 1190° C.

[0099] In some embodiments, in the above step S105, the maximum sintering temperature holding time is 2 hours to 3 hours.

[0100] In some embodiments, in the above step S105, the composite ferrite sintered body obtained after sintering is a cylinder, and the ratio of the diameter of the composite ferrite formed body to the diameter of the sintered body is 1.13-1.15:1.

[0101] In some embodiments, the absolute value of the difference between the bottom diameter of the composite ferrite sintered body and the bottom diameter of the composite ferrite formed body is 1 mm to 2 mm.

[0102] In some embodiments, the above step S10 further includes a post-processing step: the composite ferrite sintered body obtained after the composite treatment can be subjected to external cylindrical grinding according to the circulator size requirements.

[0103] A third aspect of an embodiment of the present invention provides a circulator, comprising the composite ferrite provided above.

[0104] For the convenience of explanation, in the following examples or comparative examples, unless otherwise specified, the medium used in the wet ball milling is tap water.

[0105] The grade of the permanent magnet ferrite pre-sintered material is Y40.

[0106] The center conductor is made of tungsten copper alloy, brand CuW50.

[0107] Example 1 Embodiment 1 provides a composite ferrite composed of a first permanent ferrite layer, a first gyromagnetic ferrite layer, a central conductor, a second gyromagnetic ferrite layer, and a second permanent ferrite layer connected in sequence.

[0108] The raw materials of the first permanent ferrite layer and the second permanent ferrite layer are both composed of magnetic material blocks, camphor powder and calcium stearate, and the mass ratio of the magnetic material blocks, camphor powder and calcium stearate is 1:0.009:0.006.

[0109] The raw materials of the magnetic material block are permanent magnet ferrite pre-sintered material, calcium carbonate, silicon dioxide, boric acid and calcium gluconate, with a mass ratio of 1:0.006:0.003:0.003:0.006.

[0110] The thickness of the first permanent ferrite layer and the second permanent ferrite layer are both 2 mm.

[0111] The raw materials of the first and second spin-magnetic ferrite layers are both composed of YIG ferrite pre-sintered material, bismuth oxide, camphor powder and calcium stearate, with a mass ratio of 1:0.01:0.009:0.006.

[0112] The raw materials of YIG ferrite pre-sintered material are composed of Y2O3, Fe2O3, SnO2, Bi2O3 and CaCO3, with a molar ratio of 13.2:20.8:2.4:1:2.4.

[0113] The thickness of the first gyromagnetic ferrite layer and the second gyromagnetic ferrite layer are both 1 mm.

[0114] This embodiment also provides a method for preparing the composite ferrite provided in this embodiment, and the steps are as follows: E10. Preparation of permanent magnet ferrite molding material E101. Mix the pre-sintered permanent magnet ferrite material, calcium carbonate, silicon dioxide, boric acid, and calcium gluconate and wet-ball mill them for 12 hours to obtain a permanent magnet ferrite slurry with an average particle size of 0.9 μm. In the wet-ball milling, the mass ratio of the material to water is 1:4:2.

[0115] E102. In a magnetic field with a strength of 9×10 3 Oe, under a pressure of 14 MPa, the permanent magnet ferrite slurry was wet pressed into a rectangular block to obtain a permanent magnet ferrite green body.

[0116] E103. The permanent magnet ferrite green body is coarsely crushed and dried at 200°C for 5 hours to obtain a magnetic block with a moisture content of 0.2%.

[0117] E104. Magnetic material blocks, camphor powder and calcium stearate are mixed, dispersed and crushed for 2 minutes, and then passed through a 60-mesh sieve to obtain a permanent magnet ferrite molding material.

[0118] E20. Preparation of ferrite molding materials E201.Y2O3, Fe2O3, SnO2, Bi2O3 and CaCO3 were mixed and wet ball milled for 12 hours; wherein, in the wet ball milling, the mass ratio of the ball to water was 1:6:3.

[0119] E202. The ball-milled powder was sintered at 1200°C in an oxygen atmosphere for 2 hours and then coarsely crushed to obtain a YIG ferrite pre-sintered material.

[0120] After wet ball milling of E203.YIG ferrite pre-calcined material and bismuth oxide to an average slurry particle size of 0.8μm, the slurry is dried at 200°C to a water content of less than 0.3% to obtain a gyromagnetic ferrite mixture; wherein, in the wet ball milling, the mass ratio of the ball to water is 1:6:3.

[0121] E204. The ferrite mixture, camphor powder and calcium stearate were mixed, dispersed and crushed for 2 minutes, and then passed through a 60-mesh sieve to obtain a ferrite molding material.

[0122] E30. Preparation of composite ferrite sintered body E301. After sequentially filling a cylindrical mold cavity with a diameter of 15mm with 1g of spin magnetic ferrite molding material, a Y-shaped center conductor, and 1g of spin magnetic ferrite molding material, a first pressing process is performed to obtain a pre-molded body; wherein the thickness of the Y-shaped center conductor is 0.8mm; In the first pressing process, the pressing pressure was 15 MPa and the pressing time was 10 s.

[0123] E302. After filling 2g of permanent magnet ferrite molding material, 1 piece of pre-molded body, and 2g of permanent magnet ferrite molding material in a cylindrical mold cavity with a diameter of 15.2mm, the magnetic field strength was 8×10 3 Under an axially parallel magnetic field of Oe, a second pressing process is performed to obtain a composite ferrite molded body; In the second pressing process, the pressing pressure was 15 MPa and the pressing time was 15 s.

[0124] E303. Sinter the composite ferrite formed body at a high temperature of 1180°C for 2 hours to obtain a composite ferrite sintered body.

[0125] E40. The composite ferrite sintered body is subjected to cylindrical grinding to a diameter of 13 mm to obtain the composite ferrite provided in this embodiment.

[0126] Comparative Example 1 Comparative Example 1 provides a ferrite, which is composed of a stacked first permanent ferrite sheet, a first gyromagnetic ferrite sheet, a central conductor, a second gyromagnetic ferrite sheet, and a second permanent ferrite sheet; The raw materials of the first gyromagnetic ferrite sheet and the second gyromagnetic ferrite sheet are the same as the raw materials of the gyromagnetic ferrite layer provided in Example 1; The raw materials of the first permanent magnet ferrite sheet and the second permanent magnet ferrite sheet are the same as the raw materials of the permanent magnet ferrite layer provided in Example 1; The thickness of the first gyromagnetic ferrite sheet and the second gyromagnetic ferrite sheet are both 1 mm and the diameter is 13 mm; The first permanent ferrite sheet and the second permanent ferrite sheet both have a thickness of 2 mm and a diameter of 13 mm.

[0127] To verify the progressiveness of a composite ferrite and a preparation method thereof according to an embodiment of the present invention, the composite ferrite or ferrite provided in the embodiment of the present invention and the comparative example was tested for surface center magnetic field intensity after magnetization, saturation magnetization intensity of the intermediate gyromagnetic ferrite, resonance linewidth, and dielectric constant according to GB / T 43264-2023 and GB / T 9633-2012 standards, respectively. The results are shown in Table 1 below.

[0128] Table 1

[0129] It can be seen from Table 1 above: The composite ferrite provided in Example 1, after magnetization, exhibited similar surface center magnetic field intensity, saturation magnetization intensity of the intermediate gyromagnetic ferrite, resonance linewidth, and dielectric constant to those of Comparative Example 1. This demonstrates that the method for preparing the composite ferrite provided in this embodiment of the present invention first utilizes a gyromagnetic ferrite molding material and a Y-shaped central conductor preform, then combines the preform with a permanent magnet ferrite molding material to form a composite ferrite molding, which is then sintered to produce a composite ferrite sintered body. This step-by-step method for preparing the composite ferrite sintered body yields composite ferrites with surface center magnetic field intensity, saturation magnetization intensity of the intermediate gyromagnetic ferrite, resonance linewidth, and dielectric constant that meet the operating requirements of a circulator.

[0130] It should be noted that the present invention is not limited to the above-mentioned embodiments. The above-mentioned embodiments are merely examples, and any embodiments having substantially the same structure and effect as the technical concept within the scope of the technical solution of the present invention are all included in the technical scope of the present invention. In addition, without departing from the scope of the present invention, other embodiments that can be conceived by those skilled in the art and that combine some of the constituent elements in the embodiments are also included in the scope of the present invention.

Claims

1. A composite ferrite, characterized in that: The surface center magnetic field intensity is 1150Gs~1170Gs, and the center saturation magnetization intensity is 1500Gs~1600Gs.

2. The composite ferrite according to claim 1, characterized in that The composite ferrite includes a permanent magnetic ferrite layer, a rotating magnetic ferrite layer and a central conductor; The central conductor is located on one side of the gyromagnetic ferrite layer; The permanent ferrite layer is located on the other side of the rotating ferrite layer away from the central conductor.

3. The composite ferrite according to claim 2, characterized in that The raw materials of the permanent magnetic ferrite layer include magnetic material blocks and a first auxiliary agent; And / or, the raw materials of the spin-magnetic ferrite layer include YIG ferrite pre-sintered material, bismuth oxide and a second auxiliary agent.

4. The composite ferrite according to claim 3, characterized in that The raw materials of the magnetic material block include pre-sintered permanent magnet ferrite; And / or, the raw materials of the magnetic material block further include calcium carbonate, silicon dioxide, boric acid and calcium gluconate.

5. The composite ferrite according to claim 3 or 4, characterized in that The mass ratio of the magnetic material block to the first auxiliary agent is 1:0.01-0.02; And / or, the mass ratio of the YIG ferrite pre-sintered material, the calcium carbonate, the silicon dioxide, the boric acid and the calcium gluconate is 1:0.005-0.007:0.002-0.004:0.002-0.004:0.005-0.007; And / or, the mass ratio of the YIG ferrite pre-sintered material, the bismuth oxide and the second auxiliary agent is 1:0.005-0.015:0.01-0.02; And / or, the YIG ferrite pre-sintered material includes the following raw materials: Y2O3, Fe2O3, SnO2, Bi2O3 and CaCO3.

6. A method for preparing the composite ferrite according to any one of claims 1 to 5, characterized in that: The steps include: The permanent magnet ferrite molding material, the rotary magnet ferrite molding material and the central conductor are composited to obtain the composite ferrite.

7. The method for preparing the composite ferrite according to claim 6, wherein: The composite process comprises the following steps: The permanent magnet ferrite molding material, the rotary magnet ferrite molding material and the central conductor are made into a composite ferrite molding and then sintered.

8. The method for preparing the composite ferrite according to claim 7, characterized in that: The preparation of the composite ferrite formed body comprises the following steps: The permanent magnet ferrite molding material, the rotary magnet ferrite molding material and the central conductor are press-molded under a strong magnetic field.

9. A circulator, characterized in that: The composite ferrite comprises the composite ferrite according to any one of claims 1 to 5.

10. Application of the circulator according to claim 9 in the field of communications.

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