CN114656254A - Preparation method of soft magnetic ferrite material - Google Patents

Preparation method of soft magnetic ferrite material Download PDF

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Publication number
CN114656254A
CN114656254A CN202210455381.7A CN202210455381A CN114656254A CN 114656254 A CN114656254 A CN 114656254A CN 202210455381 A CN202210455381 A CN 202210455381A CN 114656254 A CN114656254 A CN 114656254A
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sintering
soft magnetic
magnetic ferrite
grinding
main
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任芳
李崇华
刘海
汪竟阳
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China Magnetic Electronic Technology Co ltd
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China Magnetic Electronic Technology Co ltd
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Abstract

The invention provides a preparation method of a soft magnetic ferrite material, which comprises the following steps: step S1: primary ball milling of main materials: grinding the main material in a ball mill to micron level, drying and cooling to room temperature; step S2: pre-sintering: pre-sintering the cooled main material for a period of time, taking out the main material, cooling and blending with the auxiliary material; step S3: secondary ball milling: placing the mixed main material and auxiliary material into a ball mill for secondary ball milling, and drying to obtain a pre-sintered mixture; step S4: mixing and grinding: and (3) grinding the pre-sintered mixture in a ball mill, drying after grinding, granulating, pressing, sintering and forming to obtain the target soft magnetic ferrite material. The invention provides a preparation method of a soft magnetic ferrite material with high saturation magnetic flux density and excellent magnetic performance.

Description

Preparation method of soft magnetic ferrite material
Technical Field
The invention relates to the technical field of soft magnetic ferrite cores, in particular to a preparation method of a soft magnetic ferrite material.
Background
The miniaturization, flattening and high efficiency of electronic devices applied to the fields of household appliances, automotive electronics and the like continuously promote the development of various soft magnetic ferrite materials. The manganese-zinc (Mn-Zn) soft magnetic ferrite is the most widely used ferrite material, and the usage amount of the ferrite material is about more than 80 percent of the total amount of the ferrite. Because the Mn-Zn material has the characteristics of high magnetic conductivity, high saturation magnetic flux density (Bs) and low high-frequency loss, the Mn-Zn material is widely applied to the field of high-frequency power electronics. However, the saturation magnetic flux density of the Mn — Zn soft magnetic material is still relatively low compared to the metallic soft magnetic material. This means that to generate a magnetic flux density equivalent to that of the metal core, the volume of the Mn — Zn ferrite core needs to be increased, which is not in line with the market demand for miniaturization of electronic devices. In addition, the lower Curie temperature of Mn-Zn ferrite causes a large decrease in magnetic flux density in the vicinity of the operating temperature (100 ℃ C.) as compared with room temperature. Therefore, the research for improving the saturation magnetic flux density of the Mn-Zn soft magnetic ferrite at high temperature is very important.
Therefore, it is necessary to research a method for preparing a soft magnetic ferrite material having a high saturation magnetic flux density and excellent magnetic properties.
Disclosure of Invention
The invention aims to provide a preparation method of a soft magnetic ferrite material with high saturation magnetic flux density and excellent magnetic performance.
The technical purpose of the invention is realized by the following technical scheme:
a preparation method of a soft magnetic ferrite material comprises the following steps:
step S1: primary ball milling of main materials: grinding the main material in a ball mill to micron level, drying and cooling to room temperature;
step S2: pre-sintering: pre-sintering the cooled main material for a period of time, taking out the main material, cooling the main material and blending the main material and the auxiliary material;
step S3: secondary ball milling: placing the mixed main material and auxiliary material into a ball mill for secondary ball milling, and drying to obtain a pre-sintered mixture;
step S4: mixing and grinding: and (3) grinding the pre-sintered mixture in a ball mill, drying after grinding, granulating, pressing, sintering and forming to obtain the target soft magnetic ferrite material.
As a further arrangement of the present invention, the main materials are: fe2O380 to 85 portions of Mn3O425-40 parts of ZnO, 3-5 parts of ZnO, and the auxiliary materials are as follows: 0.1 to 0.3 portion of CaO and Co2O30.001-0.002 parts of SiO20.001-0.003 part of superfine heavy calcium, 2-5 parts of chopped glass fiber and 0.001-0.003 part of chopped glass fiber.
As a further configuration of the present invention, the particle size of the main material after grinding in step S1 is 10-20 μm.
As a further configuration of the present invention, the temperature of the pre-sintering in the step S2 is 600-750 ℃, and the time of the pre-sintering is 1.5-2 h.
As a further setting of the invention, the time of the secondary ball milling in the step S3 is 2.5-3 h.
As a further configuration of the present invention, the sintering and molding in step S4 includes the following steps:
step S4-1: heating and primary sintering: heating the pressed material to 800-900 ℃ under the condition of 4.5-5% of oxygen content, and primarily sintering for 1-1.5 h;
step S4-2: preserving heat: heating the primarily sintered material to 1350 ℃ and 1380 ℃, and preserving the heat for 2-5.5 h;
step S4-3: temperature return: heating the material to 1200-1250 ℃ at the speed of 1.0-3.0 ℃/min, and returning the temperature for 1-1.5h to obtain the target soft magnetic ferrite material.
As a further arrangement of the present invention, the oxygen content of the heat-retaining in step S4-2 and step S5-3 is 3.5-3.9%, and the ambient pressure in step S5-2 is 0.05-0.1 MPa.
As a further arrangement of the present invention, step S4-2' is further included between step S4-2 and step S5-3: initial cooling: the temperature of the material after heat preservation is reduced to 1050 ℃ at the speed of 1.0-3.0 ℃/min under the atmosphere with the oxygen content of 3.5-3.9 percent, and the material is preserved for 0.5-1.0 h.
The invention has the beneficial effects that:
1. the sintering and forming process of the preparation method also comprises a step of initial cooling between heat preservation and temperature return, and the step can improve the internal stress of the material to a certain degree, so that the material generates certain shrinkage, the pores in the material are further reduced, the gas in the material is removed, the pore chat in the material is reduced, the density of the material is improved, and the aim of subsequently improving the saturation magnetic flux is fulfilled.
2. The invention is also provided with a temperature return process after the initial cooling, so that the stress generated suddenly by cooling in the material is released, the toughness of the material is relieved to a certain extent while the density and the strength of the material are improved by cooling, the service life of the soft magnetic ferrite material with the high Bs value can be effectively prolonged, and the time for ensuring the high Bs value is prolonged.
3. The auxiliary materials of the invention are added with superfine heavy calcium and white carbon black, and the main components of calcium carbonate and silicon dioxide can form a barrier layer at the crystal boundary when the material forms a crystal form in the sintering process, thereby reducing the crystal boundary resistance of the material, greatly increasing the resistivity of the material, effectively reducing the eddy current loss of the soft magnet and reducing the power loss of the material.
4. The chopped glass fiber is added into the composite mixture, the chopped glass fiber can be heated at the sintering temperature of about 1000 ℃ to be in a flowing state, and the flowing chopped glass fiber can permeate into the soft magnet under the pressure condition under the condition that the sintering environmental pressure is 0.05MPa-0.1MPa, so that the pores in the material are filled, the density of the soft magnet is effectively improved, and the saturation magnetic flux density of the soft magnet is also effectively improved.
Detailed Description
The technical solution of the present invention will be clearly and completely described below with reference to specific embodiments. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without any inventive step, are within the scope of the present invention.
First, an embodiment
Example 1
The preparation method of the soft magnetic ferrite material comprises the following steps: the raw materials comprise main materials and auxiliary materials, wherein the main materials comprise: fe2O380 parts of Mn3O425 parts of ZnO, 3 parts of auxiliary materials: CaO 0.1 part, Co2O30.001 part of SiO20.001 part, 2 parts of superfine heavy calcium and 0.001 part of chopped glass fiber;
step S1: primary ball milling of main materials: grinding the main material in a ball mill until the particle size is 10 mu m, drying and cooling to room temperature;
step S2: pre-sintering: pre-sintering the cooled main material at the pre-sintering temperature of 600 ℃ for 1.5h, taking out, cooling and blending with the auxiliary material;
step S3: secondary ball milling: placing the mixed main material and auxiliary material into a ball mill for secondary ball milling for 2.5h, and drying to obtain a pre-sintered mixture;
step S4: mixing and grinding: putting the pre-sintered mixture into a ball mill for grinding, drying after grinding, granulating, pressing, sintering and forming, wherein the sintering and forming comprises the following steps:
step S4-1: heating and primary sintering: heating the pressed material to 800 ℃ under the condition of oxygen content of 4.5%, and primarily sintering for 1-1.5 h;
step S4-2: and (3) heat preservation: heating the primarily sintered material to 1350 ℃ at the heat-preservation oxygen content of 3.5%, and preserving heat for 2h at the environmental pressure of 0.05 MPa;
step S4-2': initial cooling: cooling the heat-preserved material to 1000 ℃ at the speed of 1.0 ℃/min under the atmosphere with the oxygen content of 3.5 percent, and preserving heat for 0.5 h;
step S4-3: temperature return: and heating the material to 1200 ℃ at the speed of 1.0 ℃/min, and returning the temperature for 1h to obtain the target soft magnetic ferrite material.
Example 2
A preparation method of a soft magnetic ferrite material comprises the following steps: the raw materials comprise main materials and auxiliary materials, wherein the main materials comprise: fe2O385 parts of Mn3O440 parts of ZnO, 5 parts of ZnO and the following auxiliary materials: CaO 0.3 part, Co2O30.002 parts of SiO20.003 part of superfine heavy calcium, 5 parts of chopped glass fiber;
step S1: primary ball milling of main materials: grinding the main material in a ball mill until the particle size is 20 mu m, drying and cooling to room temperature;
step S2: pre-sintering: the cooled main material is pre-sintered at 750 ℃ for 2 hours, and is taken out to be cooled and mixed with the auxiliary material;
step S3: secondary ball milling: placing the mixed main material and auxiliary material into a ball mill for secondary ball milling for 3h, and drying to obtain a pre-sintered mixture;
step S4: mixing and grinding: putting the pre-sintered mixture into a ball mill for grinding, drying after grinding, granulating, pressing, sintering and forming, wherein the sintering and forming comprises the following steps:
step S4-1: heating and primary sintering: heating the pressed material to 900 ℃ under the condition of 5 percent of oxygen content, and primarily sintering for 1.5 h;
step S4-2: and (3) heat preservation: the temperature of the material after primary sintering is raised to 1380 ℃ at the heat-preservation oxygen content of 3.9 percent, the heat is preserved for 5.5 hours, and the environmental pressure is 0.1 MPa;
step S4-2': initial cooling: cooling the heat-preserved material to 1050 ℃ at the speed of 3.0 ℃/min in the atmosphere with the oxygen content of 3.9%, and preserving the heat for 1.0 h;
step S4-3: temperature return: and (3) heating the material to 1250 ℃ at the speed of 3.0 ℃/min, and returning the temperature for 1.5h to obtain the target soft magnetic ferrite material.
Example 3
A preparation method of a soft magnetic ferrite material comprises the following steps: the raw materials comprise main materials and auxiliary materials, wherein the main materials comprise: fe2O382 parts of Mn3O430 parts of ZnO, 4 parts of ZnO and the following auxiliary materials: CaO 0.2 parts, Co2O30.0015 part of SiO20.002 parts of superfine heavy calcium, 3 parts of chopped glass fiber and 0.002 parts of chopped glass fiber;
step S1: primary ball milling of main materials: grinding the main material in a ball mill until the particle size is 15 mu m, drying and cooling to room temperature;
step S2: pre-sintering: the cooled main material is taken out and cooled to be mixed with the auxiliary material at the presintering temperature of 650 ℃ for 1.8 h;
step S3: secondary ball milling: placing the mixed main material and auxiliary material into a ball mill for secondary ball milling for 2.8h, and drying to obtain a pre-sintered mixture;
step S4: mixing and grinding: putting the pre-sintered mixture into a ball mill for grinding, drying after grinding, granulating, pressing, sintering and forming, wherein the sintering and forming comprises the following steps:
step S4-1: heating and primary sintering: heating the pressed material to 850 ℃ under the condition of oxygen content of 4.8%, and primarily sintering for 1-1.5 h;
step S4-2: and (3) heat preservation: heating the primarily sintered material to 1360 ℃ at the heat-preservation oxygen content of 3.8 percent, and preserving heat for 4 hours at the environmental pressure of 0.07 MPa;
step S4-2': initial cooling: cooling the heat-preserved material to 1030 ℃ at the speed of 2.0 ℃/min in the atmosphere with the oxygen content of 3.8 percent, and preserving heat for 0.8 h;
step S4-3: temperature return: and (3) heating the material to 1230 ℃ at the speed of 2.0 ℃/min, and returning the temperature for 1.2h to obtain the target soft magnetic ferrite material.
Example 4
A preparation method of a soft magnetic ferrite material comprises the following steps: the raw materials comprise main materials and auxiliary materials, wherein the main materials comprise: fe2O382 parts of Mn3O430 parts of ZnO, 4 parts of ZnO and the following auxiliary materials: 0.2 part of CaO and Co2O30.0015 part and 0.002 part of chopped glass fiber;
step S1: primary ball milling of main materials: grinding the main material in a ball mill until the particle size is 15 mu m, drying and cooling to room temperature;
step S2: pre-sintering: the cooled main material is pre-sintered at the temperature of 650 ℃ for 1.8h, and is taken out and cooled to be blended with the auxiliary material;
step S3: secondary ball milling: placing the mixed main material and auxiliary material into a ball mill for secondary ball milling for 2.8h, and drying to obtain a pre-sintered mixture;
step S4: mixing and grinding: putting the pre-sintered mixture into a ball mill for grinding, drying after grinding, granulating, pressing, sintering and forming, wherein the sintering and forming comprises the following steps:
step S4-1: heating for primary sintering: heating the pressed material to 850 ℃ under the condition of oxygen content of 4.8%, and primarily sintering for 1-1.5 h;
step S4-2: and (3) heat preservation: heating the primarily sintered material to 1360 ℃ at the heat-preservation oxygen content of 3.8 percent, and preserving heat for 4 hours at the environmental pressure of 0.07 MPa;
step S4-2': initial cooling: cooling the heat-preserved material to 1030 ℃ at the speed of 2.0 ℃/min in the atmosphere with the oxygen content of 3.8 percent, and preserving heat for 0.8 h;
step S4-3: temperature return: and (3) heating the material to 1230 ℃ at the speed of 2.0 ℃/min, and returning the temperature for 1.2h to obtain the target soft magnetic ferrite material.
Example 5
A preparation method of a soft magnetic ferrite material comprises the following steps: the raw materials comprise main materials and auxiliary materials, wherein the main materials comprise: fe2O382 parts of Mn3O430 parts of ZnO, 4 parts of ZnO, and the auxiliary materials are: 0.2 part of CaO and Co2O30.0015 part of SiO20.002 part of superfine heavy calcium and 3 parts of superfine heavy calcium;
step S1: primary ball milling of main materials: grinding the main material in a ball mill until the particle size is 15 mu m, drying and cooling to room temperature;
step S2: pre-sintering: the cooled main material is taken out and cooled to be mixed with the auxiliary material at the presintering temperature of 650 ℃ for 1.8 h;
step S3: secondary ball milling: placing the mixed main material and auxiliary material into a ball mill for secondary ball milling for 2.8h, and drying to obtain a pre-sintered mixture;
step S4: mixing and grinding: putting the pre-sintered mixture into a ball mill for grinding, drying after grinding, granulating, pressing, sintering and forming, wherein the sintering and forming comprises the following steps:
step S4-1: heating and primary sintering: heating the pressed material to 850 ℃ under the condition of oxygen content of 4.8%, and primarily sintering for 1-1.5 h;
step S4-2: and (3) heat preservation: heating the primarily sintered material to 1360 ℃ at the heat-preservation oxygen content of 3.8 percent, and preserving heat for 4 hours at the environmental pressure of 0.07 MPa;
step S4-2': initial cooling: cooling the heat-preserved material to 1030 ℃ at the speed of 2.0 ℃/min in the atmosphere with the oxygen content of 3.8 percent, and preserving heat for 0.8 h;
step S4-3: temperature return: and (3) heating the material to 1230 ℃ at the speed of 2.0 ℃/min, and returning the temperature for 1.2h to obtain the target soft magnetic ferrite material.
Example 6
A preparation method of a soft magnetic ferrite material comprises the following steps: the raw materials comprise main materials and auxiliary materials, wherein the main materials comprise: fe2O382 parts of Mn3O430 parts of ZnO, 4 parts of ZnO and the following auxiliary materials: CaO 0.2 parts, Co2O30.0015 part;
step S1: primary ball milling of main materials: grinding the main material in a ball mill until the particle size is 15 mu m, drying and cooling to room temperature;
step S2: pre-sintering: the cooled main material is taken out and cooled to be mixed with the auxiliary material at the presintering temperature of 650 ℃ for 1.8 h;
step S3: secondary ball milling: placing the mixed main material and auxiliary material into a ball mill for secondary ball milling for 2.8h, and drying to obtain a pre-sintered mixture;
step S4: mixing and grinding: putting the pre-sintered mixture into a ball mill for grinding, drying after grinding, granulating, pressing, sintering and forming, wherein the sintering and forming comprises the following steps:
step S4-1: heating for primary sintering: heating the pressed material to 850 ℃ under the condition of oxygen content of 4.8%, and primarily sintering for 1-1.5 h;
step S4-2: preserving heat: heating the primarily sintered material to 1360 ℃ at the heat-preservation oxygen content of 3.8 percent, and preserving heat for 4 hours at the environmental pressure of 0.07 MPa;
step S4-2': initial cooling: cooling the heat-preserved material to 1030 ℃ at the speed of 2.0 ℃/min under the atmosphere with the oxygen content of 3.8 percent, and preserving heat for 0.8 h;
step S4-3: temperature return: and (3) heating the material to 1230 ℃ at the speed of 2.0 ℃/min, and returning the temperature for 1.2h to obtain the target soft magnetic ferrite material.
Example 7
A preparation method of a soft magnetic ferrite material comprises the steps ofThe following steps: the raw materials comprise main materials and auxiliary materials, wherein the main materials comprise: fe2O382 parts of Mn3O430 parts of ZnO, 4 parts of ZnO and the following auxiliary materials: CaO 0.2 parts, Co2O30.0015 part of SiO20.002 parts of superfine heavy calcium, 3 parts of chopped glass fiber and 0.002 parts of chopped glass fiber
Step S1: primary ball milling of main materials: grinding the main material in a ball mill until the particle size is 15 mu m, drying and cooling to room temperature;
step S2: pre-sintering: the cooled main material is taken out and cooled to be mixed with the auxiliary material at the presintering temperature of 650 ℃ for 1.8 h;
step S3: secondary ball milling: placing the mixed main material and auxiliary material into a ball mill for secondary ball milling for 2.8h, and drying to obtain a pre-sintered mixture;
step S4: mixing and grinding: putting the pre-sintered mixture into a ball mill for grinding, drying after grinding, granulating, pressing, sintering and forming, wherein the sintering and forming comprises the following steps:
step S4-1: heating for primary sintering: heating the pressed material to 850 ℃ under the condition of oxygen content of 4.8%, and primarily sintering for 1-1.5 h;
step S4-2: preserving heat: heating the primarily sintered material to 1360 ℃ at the heat-preservation oxygen content of 3.8 percent, and preserving heat for 4 hours at the environmental pressure of 0.07 MPa;
step S4-3: temperature return: and (3) heating the material to 1230 ℃ at the speed of 2.0 ℃/min, and returning the temperature for 1.2h to obtain the target soft magnetic ferrite material.
Example 8
A preparation method of a soft magnetic ferrite material comprises the following steps: the raw materials comprise main materials and auxiliary materials, wherein the main materials comprise: fe2O382 parts of Mn3O430 parts of ZnO, 4 parts of ZnO and the following auxiliary materials: CaO 0.2 parts, Co2O30.0015 part of SiO20.002 parts of superfine heavy calcium, 3 parts of chopped glass fiber and 0.002 parts of chopped glass fiber;
step S1: primary ball milling of main materials: grinding the main material in a ball mill until the particle size is 15 mu m, drying and cooling to room temperature;
step S2: pre-sintering: the cooled main material is taken out and cooled to be mixed with the auxiliary material at the presintering temperature of 650 ℃ for 1.8 h;
step S3: secondary ball milling: placing the mixed main material and auxiliary material into a ball mill for secondary ball milling for 2.8h, and drying to obtain a pre-sintered mixture;
step S4: mixing and grinding: putting the pre-sintered mixture into a ball mill for grinding, drying after grinding, granulating, pressing, sintering and forming, wherein the sintering and forming comprises the following steps:
step S4-1: heating and primary sintering: heating the pressed material to 850 ℃ under the condition of oxygen content of 4.8%, and primarily sintering for 1-1.5 h;
step S4-2: and (3) heat preservation: heating the primarily sintered material to 1360 ℃ at the heat-preservation oxygen content of 3.8 percent, and preserving heat for 4 hours at the environmental pressure of 0.07 MPa;
step S4-2': initial cooling: and (3) cooling the heat-preserved material to 1030 ℃ at the speed of 2.0 ℃/min in the atmosphere with the oxygen content of 3.8%, and preserving the heat for 0.8h to obtain the target soft magnetic ferrite material.
Example 9
A preparation method of a soft magnetic ferrite material comprises the following steps: the raw materials comprise main materials and auxiliary materials, wherein the main materials comprise: fe2O382 parts of Mn3O430 parts of ZnO, 4 parts of ZnO and the following auxiliary materials: 0.2 part of CaO and Co2O30.0015 part;
step S1: primary ball milling of main materials: grinding the main material in a ball mill until the particle size is 15 mu m, drying and cooling to room temperature;
step S2: pre-sintering: the cooled main material is taken out and cooled to be mixed with the auxiliary material at the presintering temperature of 650 ℃ for 1.8 h;
step S3: secondary ball milling: placing the mixed main material and auxiliary material into a ball mill for secondary ball milling for 2.8h, and drying to obtain a pre-sintered mixture;
step S4: mixing and grinding: putting the pre-sintered mixture into a ball mill for grinding, drying after grinding, granulating, pressing, sintering and forming, wherein the sintering and forming comprises the following steps:
step S4-1: heating and primary sintering: heating the pressed material to 850 ℃ under the condition of oxygen content of 4.8%, and primarily sintering for 1-1.5 h;
step S4-2: and (3) heat preservation: and heating the primarily sintered material to 1360 ℃ at the heat-preservation oxygen content of 3.8 percent, preserving the heat for 4h and the environmental pressure of 0.07MPa to obtain the target soft magnetic ferrite material.
In order to facilitate experimental tests, the soft magnetic ferrite materials of examples 1 to 9 were prepared into standard ring samples having an outer diameter of 25 × an inner diameter of 15 × a height of 7.5, and then the magnetic correlation properties of the materials were measured using a magnetic analyzer using the standard ring samples, and the results are shown in table 1 below:
TABLE 1 magnetic Performance results for the respective samples
Figure BDA0003618537880000081
The principles and embodiments of the present invention are explained herein using specific examples, which are set forth only to help understand the method and its core ideas of the present invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

Claims (8)

1. A preparation method of a soft magnetic ferrite material is characterized by comprising the following steps:
step S1: primary ball milling of main materials: grinding the main material in a ball mill to micron level, drying and cooling to room temperature;
step S2: pre-sintering: pre-sintering the cooled main material for a period of time, taking out the main material, cooling and blending with the auxiliary material;
step S3: secondary ball milling: placing the mixed main material and auxiliary material into a ball mill for secondary ball milling, and drying to obtain a pre-sintered mixture;
step S4: mixing and grinding: and (3) grinding the pre-sintered mixture in a ball mill, drying after grinding, granulating, pressing, sintering and forming to obtain the target soft magnetic ferrite material.
2. The method for preparing the soft magnetic ferrite material according to claim 1, wherein the main materials are: fe2O380 to 85 portions of Mn3O425-40 parts of ZnO, 3-5 parts of ZnO, and the auxiliary materials are as follows: CaO 0.1-0.3 parts, Co2O30.001-0.002 part of SiO20.001-0.003 part of superfine heavy calcium, 2-5 parts of chopped glass fiber and 0.001-0.003 part of chopped glass fiber.
3. The method of preparing a soft magnetic ferrite material according to claim 1, wherein the particle size of the main material after grinding in step S1 is 10-20 μm.
4. The method for preparing the soft magnetic ferrite material according to claim 1, wherein the pre-sintering temperature in the step S2 is 600-750 ℃, and the pre-sintering time is 1.5-2 h.
5. The method for preparing a soft magnetic ferrite material as claimed in claim 1, wherein the time of the secondary ball milling in the step S3 is 2.5 to 3 hours.
6. The method of preparing a soft magnetic ferrite material as set forth in claim 1, wherein the sintering molding in the step S4 includes the steps of:
step S4-1: heating and primary sintering: heating the pressed material to 800-900 ℃ under the condition of 4.5-5% of oxygen content, and primarily sintering for 1-1.5 h;
step S4-2: and (3) heat preservation: heating the primarily sintered material to 1350 ℃ and 1380 ℃, and preserving the heat for 2-5.5 h;
step S4-3: temperature return: the material is heated to 1200-1250 ℃ at the speed of 1.0-3.0 ℃/min, and the temperature is returned for 1-1.5h, thus obtaining the target soft magnetic ferrite material.
7. The method of preparing a soft magnetic ferrite material according to claim 6, wherein the oxygen content of the heat-retaining in step S4-2 and step S5-3 is 3.5 to 3.9%, and the ambient pressure of step S5-2 is 0.05 to 0.1 MPa.
8. The method for preparing a soft magnetic ferrite material according to claim 6, further comprising, between the step S4-2 and the step S5-3, the step S4-2': initial cooling: the temperature of the material after heat preservation is reduced to 1050 ℃ at the speed of 1.0-3.0 ℃/min under the atmosphere with the oxygen content of 3.5-3.9 percent, and the material is preserved for 0.5-1.0 h.
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1623953A (en) * 2003-12-01 2005-06-08 浙江天通电子股份有限公司 Manganese zinc ferrite soft magnetic sinitering method
WO2017193384A1 (en) * 2016-05-13 2017-11-16 深圳顺络电子股份有限公司 Soft magnetic composite material and manufacturing method thereof
CN108059451A (en) * 2017-12-07 2018-05-22 天长市昭田磁电科技有限公司 A kind of high frequency power soft magnetic ferrite and preparation method thereof
CN108640670A (en) * 2018-04-26 2018-10-12 湖北华磁电子科技有限公司 High Bs values, the preparation method of low-power consumption soft magnetic ferrite and magnetic core
CN113284731A (en) * 2021-05-17 2021-08-20 湖北微硕电子科技有限公司 High-frequency large-magnetic-field soft magnetic ferrite material and preparation method thereof

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1623953A (en) * 2003-12-01 2005-06-08 浙江天通电子股份有限公司 Manganese zinc ferrite soft magnetic sinitering method
WO2017193384A1 (en) * 2016-05-13 2017-11-16 深圳顺络电子股份有限公司 Soft magnetic composite material and manufacturing method thereof
CN108059451A (en) * 2017-12-07 2018-05-22 天长市昭田磁电科技有限公司 A kind of high frequency power soft magnetic ferrite and preparation method thereof
CN108640670A (en) * 2018-04-26 2018-10-12 湖北华磁电子科技有限公司 High Bs values, the preparation method of low-power consumption soft magnetic ferrite and magnetic core
CN113284731A (en) * 2021-05-17 2021-08-20 湖北微硕电子科技有限公司 High-frequency large-magnetic-field soft magnetic ferrite material and preparation method thereof

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