CN116072327A - Ferrite magnetic core, composite silver paste thereof, preparation method and application - Google Patents
Ferrite magnetic core, composite silver paste thereof, preparation method and application Download PDFInfo
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- CN116072327A CN116072327A CN202310039586.1A CN202310039586A CN116072327A CN 116072327 A CN116072327 A CN 116072327A CN 202310039586 A CN202310039586 A CN 202310039586A CN 116072327 A CN116072327 A CN 116072327A
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- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/14—Conductive material dispersed in non-conductive inorganic material
- H01B1/16—Conductive material dispersed in non-conductive inorganic material the conductive material comprising metals or alloys
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- H—ELECTRICITY
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- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/20—Conductive material dispersed in non-conductive organic material
- H01B1/22—Conductive material dispersed in non-conductive organic material the conductive material comprising metals or alloys
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- H—ELECTRICITY
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- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
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Abstract
Ferrite core and compound silver paste, preparation method and application thereof, wherein the compound silver paste comprises the following components: superfine silver coated copper powder, superfine silver Bao Lvfen, flake silver powder, nanometer silver powder, glass powder and an organic carrier; the grain diameter of the superfine silver-coated copper powder is 1.5-2.5 mu m; the grain diameter of the superfine silver-coated aluminum powder is 1.0-2.0 mu m; the particle size of the flake silver powder is 3.5-4.5 mu m; the grain diameter of the nanometer silver powder is 60-80nm. The preparation method is used for preparing the composite silver paste. And a ferrite core, the surface of which is provided with a composite silver layer. The composite silver paste for the ferrite magnetic core uses superfine silver-coated copper powder and superfine silver-coated aluminum powder as main silver raw materials to replace pure silver raw materials, and realizes that the superfine silver-coated copper powder and the superfine silver-coated aluminum powder replace the pure silver raw materials by adjusting the particle size of each silver powder, so that the problems of high production cost caused by using high-content pure silver in the electronic paste and reduced performance of the electronic paste caused by using non-pure silver raw materials are solved.
Description
Technical Field
The invention relates to the technical field of ferrite cores, in particular to a ferrite core, and composite silver paste, a preparation method and application thereof.
Background
Ferrite core, its raw materials are ferrite, it is the metal oxide with ferrimagnetism, it is the non-metallic magnetic material that the field of high frequency weak current uses extensively. The silver paste of the existing ferrite core mainly uses pure silver as a silver raw material, and the pure silver raw material has high conductivity, so that the pure silver electronic paste is still not replaced in the market demand of the existing ferrite core; however, the performance of the silver paste after sintering is reduced due to the addition of the non-silver element in the silver paste, for example, the poor compactness of the silver layer and the weak conductivity of the silver layer affect the nickel plating effect, and the performance requirement of the ferrite core cannot be met.
Disclosure of Invention
The invention aims to provide composite silver paste of a ferrite magnetic core, which uses superfine silver-coated copper powder and superfine silver-coated aluminum powder as main silver raw materials to replace pure silver raw materials, and the performance of the prepared composite silver paste is equivalent to that of the pure silver paste by adjusting the particle size of each silver powder, so that the superfine silver-coated copper powder and superfine silver-coated aluminum powder can be used for replacing the pure silver raw materials.
The invention also provides a preparation method of the composite silver paste of the ferrite core, which is used for preparing the composite silver paste.
The invention also provides application of the composite silver paste in preparing a ferrite core with low cost.
The invention also provides a ferrite magnetic core, and the surface of the ferrite magnetic core is provided with the composite silver layer prepared from the composite silver paste.
To achieve the purpose, the invention adopts the following technical scheme:
the composite silver paste for the ferrite magnetic core comprises the following raw materials in parts by weight: 35-45 parts of superfine silver-coated copper powder, 20-30 parts of superfine silver-coated aluminum powder, 5-10 parts of flake silver powder, 5-10 parts of nano silver powder, 1-2 parts of fumed silica, 3-5 parts of glass powder and 10-20 parts of organic carrier;
the grain diameter of the superfine silver-coated copper powder is 1.5-2.5 mu m; the grain diameter of the superfine silver-coated aluminum powder is 1.0-2.0 mu m;
the particle size of the flake silver powder is 3.5-4.5 mu m; the particle size of the nano silver powder is 60-80nm.
Preferably, the fineness of the composite silver paste is less than 10 μm.
Preferably, the viscosity of the composite silver paste is 400+/-50 dPa.s.
Preferably, the organic carrier includes ethylcellulose, acrylic resin, alcohol solvents and lipid solvents.
Preferably, the glass powder is one or more of silicon oxide, diboron trioxide, lithium oxide, copper oxide and potassium oxide.
The preparation method of the composite silver paste for the ferrite core is used for preparing the composite silver paste for the ferrite core and is characterized by comprising the following steps of:
mixing the raw materials of the composite silver paste according to the proportion, and stirring, wherein the stirring speed is increased from slow to fast; dispersing after stirring until the fineness is less than 10 mu m and the viscosity reaches 400+/-50 dPa.s; sieving with a screen.
The application of the composite silver paste in preparing the ferrite core with low cost is provided, wherein the composite silver paste is the composite silver paste of the ferrite core.
A ferrite core, the surface of which is provided with a composite silver layer;
the raw material of the composite silver layer is the composite silver paste of the ferrite magnetic core.
Drawings
FIG. 1 is a schematic diagram of an appearance inspection standard for ferrite cores with composite silver paste film layers;
FIG. 2 is a standard schematic diagram of a composite silver paste film layer not prone to scratching in dry film strength detection;
FIG. 3 is a schematic illustration of the composite silver paste film being easily scratched in dry film strength testing;
FIG. 4 is a standard schematic diagram of the composite silver paste film layer being qualified in sintering densification detection;
FIG. 5 is a schematic illustration of a composite silver paste film layer during adhesion testing;
the technical scheme provided by the invention can comprise the following beneficial effects:
the composite silver paste for the ferrite magnetic core uses superfine silver-coated copper powder and superfine silver-coated aluminum powder as main silver raw materials to replace pure silver raw materials, and the performance of the prepared composite silver paste is equivalent to that of pure silver paste by adjusting the particle size of each silver powder, so that the superfine silver-coated copper powder and superfine silver-coated aluminum powder can replace the pure silver raw materials, and the problems that the production cost is high due to the fact that high-content pure silver is used in electronic paste and the performance of the electronic paste is reduced due to the fact that non-pure silver raw materials are used are solved.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The technical scheme of the scheme is further described through the specific embodiments.
The composite silver paste for the ferrite magnetic core comprises the following raw materials in parts by weight: 35-45 parts of superfine silver-coated copper powder, 20-30 parts of superfine silver-coated aluminum powder, 5-10 parts of flake silver powder, 5-10 parts of nano silver powder, 1-2 parts of fumed silica, 3-5 parts of glass powder and 10-20 parts of organic carrier;
the grain diameter of the superfine silver-coated copper powder is 1.5-2.5 mu m; the grain diameter of the superfine silver-coated aluminum powder is 1.0-2.0 mu m;
the particle size of the flake silver powder is 3.5-4.5 mu m; the particle size of the nano silver powder is 60-80nm.
The superfine silver-coated copper powder takes nano copper as an inner core and is adhered to the surface of the copper powder through silver ions to form an outer silver-coated structure, the particle size of the superfine silver-coated copper powder is preferably 1.5-2.5 mu m, and under the particle size range, the superfine silver-coated copper powder can replace 25-35% (wt%) pure silver powder in silver paste when being matched with other raw material silver in the scheme under the condition of 35-45 parts by mass. The superfine silver-coated aluminum powder takes nano aluminum as an inner core and is adhered to the surface of the nano aluminum powder through silver ions to form an outer silver-coated structure, the particle size of the superfine silver-coated aluminum powder is preferably 1.0-2.0 mu m, and the superfine silver-coated aluminum powder can replace 20-30% (wt%) pure silver powder in silver paste when being matched with other raw material silver in the scheme under the particle size range of 20-30 parts by mass. The particle size of the flake silver powder is 3.5-4.5 mu m, and the flake silver powder is mainly of a flake structure and has a certain length-width ratio, so that a connecting structure can be provided among other silver raw materials; the particle size of the nanometer silver powder is 60-80nm, and the particle size is far smaller than that of other silver powder, so that the filling effect among the superfine silver-coated copper powder, the superfine silver-coated aluminum powder and the flake silver powder is better;
the composite silver paste for the ferrite magnetic core uses superfine silver-coated copper powder and superfine silver-coated aluminum powder as main silver raw materials to replace pure silver raw materials, and the performance of the prepared composite silver paste is equivalent to that of pure silver paste by adjusting the particle size of each silver powder, so that the superfine silver-coated copper powder and superfine silver-coated aluminum powder can replace the pure silver raw materials, and the problems that the production cost is high due to the fact that high-content pure silver is used in electronic paste and the performance of the electronic paste is reduced due to the fact that non-pure silver raw materials are used are solved.
Preferably, the fineness of the composite silver paste is less than 10 μm.
The fineness of the composite silver paste is not excessively large, and the fineness of the composite silver paste is smaller than 10 mu m, so that the problems of poor compactness of a silver layer and reduced dry film strength of the paste mixed by superfine silver-coated copper powder, superfine silver Bao Lvfen, flaky silver powder and nanometer silver powder occur after sintering.
Preferably, the viscosity of the composite silver paste is 400+/-50 dPa.s.
The viscosity of the composite silver paste is 400+/-50 dPa.s, namely, the viscosity of 350-450Pa.s is the optimal viscosity of the silver paste according to the scheme, the viscosity of the composite silver paste is not too high or too low, the too high viscosity can cause insufficient leveling property of the paste, so that the paste is easy to crack after sintering, the too low viscosity can cause easy diffusion of the paste, thixotropic property of the paste is poor, and the paste is not neat after sintering.
Preferably, the organic carrier includes ethylcellulose, acrylic resin, alcohol solvents and lipid solvents.
The organic carrier can effectively mix other raw materials of the composite silver paste, so that the composite silver paste is convenient to transfer, and when the composite silver paste is dried and sintered, the organic carrier can be oxidized and separated from the film layer, so that silver is attached to the ferrite core.
The solution adopts ethyl cellulose, acrylic resin, alcohol solvent and lipid solvent as organic carrier, the dispersing effect of silver raw material in the organic carrier is good, and the requirements of the formula are satisfied in the characteristic and viscosity adjusting range of the solvent.
Preferably, the glass powder is one or more of silicon oxide, diboron trioxide, lithium oxide, copper oxide and potassium oxide.
The glass powder can be replaced by glass powder with other well-known proportions, and the scheme is to mix silicon oxide, diboron trioxide, lithium oxide, copper oxide and potassium oxide, so that the prepared composite silver paste can be sintered in an environment of 640-700 ℃, the sintering temperature is low, the energy consumption can be reduced, and the bonding degree with silver raw materials is good.
The preparation method of the composite silver paste for the ferrite core is used for preparing the composite silver paste for the ferrite core and is characterized by comprising the following steps of:
mixing the raw materials of the composite silver paste according to the proportion, and stirring, wherein the stirring speed is increased from slow to fast; dispersing after stirring until the fineness is less than 10 mu m and the viscosity reaches 400+/-50 dPa.s; sieving with a screen.
The mesh number of the screen can be selected according to the actual situation, and the mesh number of the screen is preferably 90-110 mesh.
The application of the composite silver paste in preparing the ferrite core with low cost is provided, wherein the composite silver paste is the composite silver paste of the ferrite core.
A ferrite core, the surface of which is provided with a composite silver layer;
the raw material of the composite silver layer is the composite silver paste of the ferrite magnetic core.
Ferrite is a metal oxide with ferrimagnetism, and becomes a nonmetallic magnetic material with wide application in the field of high-frequency weak current. The magnetic core is a product formed by molding and sintering ferrite materials. The solution can be coated on the surface of a ferrite core in a pad printing or silver dipping mode, and then the composite silver layer is manufactured on the surface of the ferrite core through production processes such as drying, high-temperature sintering, surface treatment, nickel melting, nickel plating, tin plating and the like.
Performance test:
appearance detection: and observing the ferrite magnetic core attached with the composite silver paste film layer by using a microscope, and observing whether the film layer has gaps, cracks and integrity, and if no appearance defect exists, the ferrite magnetic core is qualified. As in figure 1, is a good product.
Dry film strength, two identical ferrite cores were tested for dry film strength of the composite silver paste film layer. If the ferrite core is not scratched, judging that the ferrite core is not scratched easily, as shown in fig. 2; if the ferrite core is scratched, the ferrite core is judged to be easy to scratch, as shown in fig. 3.
Sintering compactness, detecting the compactness of the composite silver paste film layer by using a scanning electron microscope, and qualifying that no continuous gaps of more than 10 microns exist, as shown in figure 4;
adhesion test: the adhesion of the composite silver paste film layer was tested using a digital tensiometer and the core residual coverage was measured, similar to that of fig. 5.
Example a:
the preparation method of the composite silver paste of the ferrite core comprises the following steps:
mixing the raw materials of the composite silver paste according to the proportion, wherein the proportion is shown in table 1, stirring, and gradually increasing the stirring speed from 0 to 500rpm/min; dispersing by using a three-roller machine after stirring is completed, wherein the times are 10 times, and preparing slurry with fineness less than 10 mu m and viscosity reaching 450 dPa.s; sieving with 100 mesh sieve;
the grain diameter of the superfine silver-coated copper powder is 2.0 mu m; the grain diameter of the superfine silver-coated aluminum powder is 1.5 mu m;
the particle size of the flake silver powder is 4.0 mu m; the particle size of the nano silver powder is 70nm;
glass powder comprises the following components in parts by weight: 40 parts of silicon oxide, 20 parts of diboron trioxide, 4 parts of lithium oxide, 6 parts of copper oxide and 30 parts of potassium oxide.
Example B:
the preparation method of the composite silver paste of the ferrite core comprises the following steps:
mixing the raw materials of the composite silver paste according to the proportion shown in the table 1, and stirring, wherein the stirring speed is gradually increased from 100rpm/min to 700rpm/min; dispersing by using a three-roller machine after stirring is completed, wherein the times are 8 times, and preparing slurry with fineness less than 8 mu m and viscosity reaching 400 dPa.s; sieving with 110 mesh sieve.
The grain diameter of the superfine silver-coated copper powder is 1.5 mu m; the grain diameter of the superfine silver-coated aluminum powder is 2.0 mu m;
the particle size of the flake silver powder is 3.5 mu m; the grain diameter of the nanometer silver powder is 60nm;
glass powder comprises the following components in parts by weight: 50 parts of silicon oxide, 10 parts of lithium oxide, 10 parts of copper oxide and 30 parts of potassium oxide.
Example C:
the preparation method of the composite silver paste of the ferrite core comprises the following steps:
mixing the raw materials of the composite silver paste according to the proportion shown in the table 1, and stirring, wherein the stirring speed is gradually increased from 0rpm/min to 900rpm/min; dispersing by using a three-roller machine after stirring is completed, wherein the times are 12 times, and preparing slurry with fineness less than 3 mu m and viscosity reaching 350 dPa.s; sieving with 90 mesh sieve.
The grain diameter of the superfine silver-coated copper powder is 2.5 mu m; the grain diameter of the superfine silver-coated aluminum powder is 1.0 mu m;
the particle size of the flake silver powder is 4.5 mu m; the grain diameter of the nanometer silver powder is 80nm;
glass powder comprises the following components in parts by weight: 20 parts of silicon oxide, 30 parts of diboron trioxide, 14 parts of lithium oxide, 6 parts of copper oxide and 30 parts of potassium oxide.
Example D:
the preparation method of the composite silver paste of the ferrite core comprises the following steps:
mixing the raw materials of the composite silver paste according to the proportion shown in the table 1, and stirring, wherein the stirring speed is gradually increased from 0rpm/min to 800rpm/min; dispersing by using a three-roller machine after stirring is completed, wherein the times are 11 times, and preparing slurry with fineness less than 4 mu m and viscosity reaching 350 dPa.s; sieving with 100 mesh sieve.
The grain diameter of the superfine silver-coated copper powder is 2.5 mu m; the grain diameter of the superfine silver-coated aluminum powder is 1.0 mu m;
the particle size of the flake silver powder is 4.0 mu m; the particle size of the nano silver powder is 75nm;
glass powder comprises the following components in parts by weight: 40 parts of silicon oxide, 20 parts of diboron trioxide, 4 parts of lithium oxide and 30 parts of potassium oxide.
Comparative example A1: the preparation method of comparative example A1 was substantially the same as that of example A, except that the fineness of the slurry of comparative example A1 was 12. Mu.m.
Comparative example A2: the preparation method of comparative example A2 was substantially the same as that of example a, except that the viscosity of the slurry of comparative example A2 was 300dpa.s.
Comparative example A3: the preparation method of comparative example A3 was substantially the same as that of example a, except that the viscosity of the slurry of comparative example A3 was 500dpa.s.
Comparative example B: the preparation method of comparative example B was substantially the same as that of example a, except that the raw material formulation of the composite silver paste of comparative example B was as shown in table 1.
TABLE 1 proportion of Compound silver paste of examples A-D and comparative example B
The silver pastes prepared in examples A to D and comparative examples A to B were baked and sintered, respectively, and then plated to form a silver coating layer having a thickness of about 20 μm on a ferrite core, and then performance test was performed, and the results are shown in Table 2.
TABLE 2 Performance test results for examples A-D and comparative examples A-B
Scratch is as follows:
description:
1. as is clear from the comparison of the example A and the comparative example A1, the fineness of the slurry is adjusted to be 12 mu m, the fineness of the slurry is larger than 10 mu m, the slurry of the comparative example A1 is poor in silver layer compactness after sintering, and is unqualified in sintering compactness, and has a complete film layer structure, but the film has low dry film strength and is easy to scratch, and the adhesive force is relatively lower than that of the example A, so that the fineness of the composite silver slurry is not excessively large, and the sintering compactness of the slurry is easy to be reduced when the fineness exceeds 10 mu m.
2. From the comparison of example A with comparative examples A2 and A3, the viscosity of the comparative example A2 slurry was 300dPa.s, and the viscosity of the comparative example A3 slurry was 500dPa.s; while the slurry of comparative example A2 was not complete in appearance, and the sintered compactibility of comparative example A3 was failed, and the dry film strength of comparative example A2 and comparative example A3 were tested as easily scratched; the method mainly comprises the steps that the viscosity of slurry prepared from superfine silver-coated copper powder, superfine silver Bao Lvfen, flake silver powder, nano silver powder, fumed silica, glass powder and an organic carrier is required to be strictly controlled, the viscosity is not too high or too low, the slurry is insufficient in leveling property and easy to crack after sintering due to the fact that the viscosity is too low, the slurry is easy to diffuse and poor in thixotropic property, and the slurry is irregular after sintering. Thus, since the viscosities of the slurries of comparative examples A2 and A3 exceeded 400.+ -.50 dPa.s, and the viscosities of the slurries exceeded 400.+ -.50 dPa.s under the same formulation and process, a performance degradation occurred after sintering of the slurries, indicating that the slurries of this protocol should have viscosities of 400.+ -.50 dPa.s.
3. As can be seen from the comparison of the example a and the comparative example B, the comparative example B1 was free from adding the ultra-fine silver-coated copper powder, the comparative example B2 was free from adding the ultra-fine silver-coated aluminum powder, the comparative example B3 was free from adding the plate-like silver powder, and the comparative example B4 was free from adding the nano silver powder; the superfine silver-coated copper powder and the superfine silver-coated aluminum powder adopt a silver-coated structure formed by taking nano copper or nano aluminum as an inner core and attaching silver ions to the surface of the inner core; the superfine silver-coated copper powder and the superfine silver-coated aluminum powder can be matched with the flake silver powder and the nanometer silver powder, and the prepared composite silver paste has excellent upper silver appearance, dry film strength, sintering compactness and adhesive force by adjusting the particle size of the silver powder and the fineness and viscosity of the paste, so that the manufacturing cost is greatly reduced, and meanwhile, according to the composite silver paste formula of the scheme, the superfine silver-coated copper powder and the superfine silver-coated aluminum powder can replace pure silver. Thus, since comparative example B1 lacks the ultra-fine silver-coated copper powder, comparative example B2 lacks ultra-fine silver Bao Lvfen, which results in a decrease in the appearance of upper silver, dry film strength, sintered compactibility and adhesion; while the lack of the flake silver powder in comparative example B3 and the lack of the nano silver powder in comparative example B4 also resulted in the dry film strength being detected as easily scratched, and the sintered compactibility and adhesion were both reduced. It is illustrated that the superfine silver-coated copper powder, the superfine silver Bao Lvfen, the flake silver powder and the nano silver powder in the scheme should be used in combination, and the lack of one of the raw materials can lead to the reduction of the appearance, the dry film strength, the sintering compactness and the adhesive force of the upper silver when the pure silver is used instead.
Comparative example C:
comparative example C: the preparation method of the comparative example C is basically the same as that of the example A, except that pure silver is adopted to replace the superfine silver-coated copper powder and pure silver is adopted to replace the superfine silver-coated aluminum powder in the raw materials of the slurry of the comparative example C, and the two pure particle sizes respectively correspond to the superfine silver-coated copper powder and the superfine silver-coated aluminum powder of the example A.
The silver pastes prepared in comparative example C were each baked and sintered, then plated to form a silver coating layer having a thickness of about 20 μm on the ferrite core, and then subjected to performance test, and the results are shown in table 3.
TABLE 3 Performance test results for example A and comparative example C
Description:
in the comparative example C, though the pure silver is used for replacing the superfine silver-coated copper powder and the superfine silver-coated aluminum powder, the testing performance of the comparative example C in appearance detection, dry film strength, sintering compactness and adhesive force is the same as that of the example A, and the superfine silver-coated copper powder and the superfine silver-coated aluminum powder of the example A are of an outer silver-coated structure formed by taking nano copper or nano aluminum as an inner core and attaching the nano copper or nano aluminum to the surface of the outer silver-coated copper powder through silver ions, so that the cost of the example A is lower, and the composite silver paste with the same performance as that of the comparative example C can be prepared by adjusting the particle size of silver powder and the fineness and viscosity of the paste, and the problems of high production cost caused by using pure silver with high content of electronic paste and performance reduction caused by using non-pure silver raw materials are solved.
The technical principle of the present solution is described above in connection with the specific embodiments. The description is only intended to explain the principles of the present solution and should not be construed in any way as limiting the scope of the present solution. Based on the explanations herein, other embodiments of the present solution will be apparent to those skilled in the art without undue burden, and such modifications will fall within the scope of the present solution.
Claims (8)
1. The composite silver paste for the ferrite core is characterized by comprising the following raw materials in parts by weight: 35-45 parts of superfine silver-coated copper powder, 20-30 parts of superfine silver-coated aluminum powder, 5-10 parts of flake silver powder, 5-10 parts of nano silver powder, 1-2 parts of fumed silica, 3-5 parts of glass powder and 10-20 parts of organic carrier;
the grain diameter of the superfine silver-coated copper powder is 1.5-2.5 mu m; the grain diameter of the superfine silver-coated aluminum powder is 1.0-2.0 mu m;
the particle size of the flake silver powder is 3.5-4.5 mu m; the particle size of the nano silver powder is 60-80nm.
2. The composite silver paste for ferrite cores according to claim 1, wherein the fineness of the composite silver paste is less than 10 μm.
3. The composite silver paste for ferrite cores according to claim 1, wherein the viscosity of said composite silver paste is 400±50dpa.s.
4. The composite silver paste for ferrite cores according to claim 1, wherein said organic carrier comprises ethylcellulose, acrylic resin, alcohol solvents and lipid solvents.
5. The composite silver paste for ferrite cores according to claim 1, wherein said glass powder is one or more of silicon oxide, diboron trioxide, lithium oxide, copper oxide and potassium oxide.
6. A method for preparing a composite silver paste for ferrite cores, which is used for preparing the composite silver paste for ferrite cores according to any one of claims 1 to 5, and is characterized by comprising the following steps:
mixing the raw materials of the composite silver paste according to the proportion, and stirring, wherein the stirring speed is increased from slow to fast; dispersing after stirring until the fineness is less than 10 mu m and the viscosity reaches 400+/-50 dPa.s; sieving with a screen.
7. Use of a composite silver paste for the preparation of a ferrite core at low cost, characterized in that the composite silver paste is a composite silver paste for a ferrite core according to any one of claims 1-5.
8. A ferrite core, characterized in that the surface of the ferrite core is provided with a composite silver layer;
the raw material of the composite silver layer is the composite silver paste of the ferrite magnetic core according to any one of claims 1-5.
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