Ferrite joint and preparation method thereof

Abstract

The invention provides a ferrite joint and a preparation method thereof, and relates to the technical field of welding, the method comprises the following steps: heating a first raw material to a first target sintering temperature, and carrying out heat preservation for a first time to obtain a first molten glass liquid; after the first molten glass is poured into a first mold, the first molten glass is heated to a first preset temperature, heat preservation is conducted for a first preset time, so that a magnetic phase in the first molten glass is fully separated out, the first molten glass is cooled to the room temperature, magnetic microcrystalline glass brazing filler metal is obtained, and the magnetic microcrystalline glass brazing filler metal is made into a first brazing filler metal sheet; preparing the microcrystalline glass brazing filler metal into a second brazing filler metal sheet; preparing the to-be-connected ferrite assembly, heating the to-be-connected ferrite assembly to a welding temperature, and carrying out heat preservation treatment to obtain a ferrite joint; wherein the welding temperature ranges from 600 DEG C to 700 DEG C. When the magnetic brazing filler metal is used for welding the ferrite, by adopting the preparation method of the ferrite joint, the welding temperature can be reduced, and meanwhile, the strength of the ferrite joint can be ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of welding, and more particularly, to a ferrite joint and a preparation method thereof. Background Art

[0002] Yttrium iron garnet ferrite (YIG ferrite) is a magnetic material widely used in microwave devices. Currently, microwave ferrite devices are often connected by gluing. Since the colloid itself does not have magnetism, there is often magnetic property attenuation at the joints of microwave ferrite devices. Glass brazing refers to a welding method using glass filler metal as the filler metal, and specific functional joints can be constructed by adjusting the composition of the glass filler metal. Glass filler metals are mainly divided into three categories: amorphous glass filler metal, composite glass filler metal, and microcrystalline glass filler metal. Among them, microcrystalline glass filler metal can introduce target precipitated phases into the joint through crystallization, and introduce the properties of the target precipitated phases into the joint while retaining the excellent properties of the glass matrix. The magnetic phase generated after heat treatment of magnetic microcrystalline glass filler metal can introduce magnetism, so it becomes a better choice for connecting ferrites. However, the softening temperature of magnetic glass is very high, requiring a relatively high welding temperature. Therefore, when welding ferrites with magnetic filler metal, how to ensure the strength of the ferrite joint while reducing the welding temperature has become an urgent technical problem to be solved. Summary of the Invention

[0003] The problem solved by the present invention is: when welding ferrites with magnetic filler metal, how to ensure the strength of the ferrite joint while reducing the welding temperature.

[0004] To solve the above problems, the present invention provides a preparation method for a ferrite joint, including:

[0005] Step S1: Heat the first raw material to a first target sintering temperature and keep it warm for a first period of time to obtain a first molten glass liquid; wherein, calculated by mole fraction, the components of the first raw material include: Bi2O3: 25 parts to 55 parts, B2O3: 25 parts to 45 parts, BaCO3: 6 parts to 15 parts, Fe2O3: 6 parts to 20 parts;

[0006] Step S2: Pour the first molten glass liquid into a first mold, then heat it to a first preset temperature and keep it warm for a first preset period of time to fully precipitate the magnetic phase in the first molten glass liquid, and cool it to room temperature to obtain a magnetic microcrystalline glass filler metal, and make the magnetic microcrystalline glass filler metal into a first filler metal sheet;

[0007] Step S3: Make the microcrystalline glass filler metal into a second filler metal sheet; wherein, the microcrystalline glass filler metal is made from a second raw material, and calculated by mole fraction, the components of the second raw material include: Bi2O3: 25 parts to 55 parts, B2O3: 25 parts to 45 parts, ZnO: 10 parts to 30 parts;

[0008] Step S4: Prepare the ferrite component to be joined, which is formed by laminating a ferrite base material, a second solder sheet, a first solder sheet, a second solder sheet, and a ferrite base material in sequence from top to bottom;

[0009] Step S5: Heat the ferrite component to be joined to the welding temperature and perform heat preservation treatment to obtain a ferrite joint; wherein, the welding temperature is 600°C to 700°C.

[0010] Optionally, in step S2, the first preset temperature is 900°C to 1000°C.

[0011] Optionally, in step S2, the first preset time is 3 h to 8 h.

[0012] Optionally, in step S1, the first target sintering temperature is 1100°C to 1400°C.

[0013] Optionally, in step S1, the first time is 40 min to 120 min.

[0014] Optionally, in step S5, the heat preservation time is 10 min to 120 min.

[0015] Optionally, in step S3, the preparation method of the glass-ceramic solder includes:

[0016] Step S31: Heat the second raw material to the second target sintering temperature and keep it for the second time to obtain a second molten glass liquid;

[0017] Step S32: Pour the second molten glass liquid into a second mold and cool it to room temperature to obtain the glass-ceramic solder.

[0018] Optionally, in step S31, the second target sintering temperature is 950°C to 1050°C.

[0019] Optionally, in step S31, the second time is 40 min to 120 min.

[0020] The present invention also provides a ferrite joint, which is made by using the preparation method of the ferrite joint as described above.

[0021] Compared with the related technologies, when the present invention uses a magnetic solder to weld a ferrite, the ferrite components to be joined are stacked in sequence from top to bottom as a ferrite base material, a second solder sheet, a first solder sheet, a second solder sheet, and a ferrite base material; wherein, the first raw material components for preparing the first solder sheet include: Bi2O3: 25 parts to 55 parts, B2O3: 25 parts to 45 parts, BaCO3: 6 parts to 15 parts, Fe2O3: 6 parts to 20 parts; specifically, the preparation method of the first solder sheet is: first, heat the first raw materials to a first target sintering temperature and keep warm for a specific time to obtain a first molten glass liquid, and then keep warm at a specific temperature for a specific time to enable the magnetic phase in the first molten glass liquid to fully precipitate, so that when the first solder sheet is welded, it can be fully melted at a lower temperature and has better fluidity, which is beneficial to reducing the welding temperature; in addition, the components of the second raw materials for preparing the second solder sheet include: Bi2O3: 25 parts to 55 parts, B2O3: 25 parts to 45 parts, ZnO: 10 parts to 30 parts; the second solder sheet and the first solder sheet have the same components Bi2O3 and B2O3, and they belong to a similar system of glass-ceramic solders, so the second solder sheet can achieve good fusion with the first solder sheet, and the second solder sheet can be fully melted at a lower temperature and has better fluidity, which is beneficial to further reducing the welding temperature. It can be seen that by using the preparation method of the ferrite joint of the present invention, the welding of the ferrite can be achieved at a lower welding temperature (600 °C to 700 °C); in addition, the reduction of the welding temperature can avoid the adverse effects on the performance of the ferrite base material, so it is also beneficial to ensure the strength of the ferrite joint. In summary, when using a magnetic solder to weld a ferrite, by adopting the preparation method of the ferrite joint of the present invention, the welding temperature can be reduced while ensuring the strength of the ferrite joint. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic flow chart of the preparation method of the ferrite joint. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] To make the above objects, features, and advantages of the present invention more obvious and understandable, the following detailed description of the specific embodiments of the present invention will be given with reference to the accompanying drawings. Although some embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as limited to the embodiments described herein. On the contrary, these embodiments are provided to more thoroughly and completely understand the present invention. It should be understood that the drawings and embodiments of the present invention are only for exemplary purposes and are not used to limit the protection scope of the present invention.

[0024] Unless otherwise defined, all technical and scientific terms used in the present invention have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention belongs. The terms used in the description of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0025] As used herein, the term "comprising" and its variations are open-ended, that is, "including but not limited to"; the term "based on" means "at least partially based on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; the term "optionally" means "optional embodiment". The relevant definitions of other terms will be given in the following description. It should be noted that the concepts such as "first" and "second" mentioned in the present invention are used to distinguish different objects, rather than to describe a specific order or primary-secondary relationship. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0026] Regarding the problems existing in the above related technologies, such as Figure 1 As shown, this embodiment provides a preparation method of a ferrite joint, including:

[0027] Step S1: Heat the first raw material to a first target sintering temperature and keep it warm for a first period of time to obtain a first molten glass liquid; wherein, calculated by mole fraction, the components of the first raw material include: Bi2O3: 25 parts to 55 parts, B2O3: 25 parts to 45 parts, BaCO3: 6 parts to 15 parts, Fe2O3: 6 parts to 20 parts;

[0028] Step S2: After pouring the first molten glass liquid into a first mold, heat it to a first preset temperature and keep it warm for a first preset time to enable the magnetic phase in the first molten glass liquid to precipitate sufficiently, and then cool it to room temperature to obtain a magnetic glass-ceramic solder, and form the magnetic glass-ceramic solder into a first solder sheet;

[0029] Step S3: Form the glass-ceramic solder into a second solder sheet; wherein, the glass-ceramic solder is made from a second raw material, and calculated by mole fraction, the components of the second raw material include: Bi2O3: 25 parts to 55 parts, B2O3: 25 parts to 45 parts, ZnO: 10 parts to 30 parts;

[0030] Step S4: Prepare the ferrite component to be joined, which is formed by laminating a ferrite base material, a second solder sheet, a first solder sheet, a second solder sheet, and a ferrite base material from top to bottom in sequence;

[0031] Step S5: Heat the ferrite component to be joined to the welding temperature and perform heat preservation treatment to obtain a ferrite joint; wherein, the welding temperature is 600°C to 700°C.

[0032] In the embodiment of the present invention, when welding ferrite using a magnetic solder, the ferrite component to be joined is formed by laminating a ferrite base material, a second solder sheet, a first solder sheet, a second solder sheet, and a ferrite base material from top to bottom in sequence; wherein, the first raw material components for preparing the first solder sheet include: Bi2O3: 25 parts to 55 parts, B2O3: 25 parts to 45 parts, BaCO3: 6 parts to 15 parts, Fe2O3: 6 parts to 20 parts; specifically, the preparation method of the first solder sheet is: first heat the first raw materials to the first target sintering temperature and keep warm for a specific time to obtain a first molten glass liquid, and then keep warm at a specific temperature for a specific time to enable the magnetic phase in the first molten glass liquid to precipitate sufficiently, so that the first solder sheet can be fully melted at a lower temperature and has better fluidity during welding, which is beneficial to reducing the welding temperature; in addition, the components of the second raw materials for preparing the second solder sheet include: Bi2O3: 25 parts to 55 parts, B2O3: 25 parts to 45 parts, ZnO: 10 parts to 30 parts; the second solder sheet and the first solder sheet have the same components Bi2O3 and B2O3 in their components, and they belong to similar systems of glass-ceramic solders, so the second solder sheet can be well fused with the first solder sheet, and the second solder sheet can be fully melted at a lower temperature and has better fluidity, which is beneficial to further reducing the welding temperature. It can be seen that by using the preparation method of the ferrite joint in the embodiment of the present invention, the welding of ferrite can be achieved at a lower welding temperature (600°C to 700°C); in addition, the reduction of the welding temperature can avoid the adverse effects on the performance of the ferrite base material, so it is also beneficial to ensure the strength of the ferrite joint. In summary, when welding ferrite using a magnetic solder, by using the preparation method of the ferrite joint in the embodiment of the present invention, the welding temperature can be reduced while ensuring the strength of the ferrite joint.

[0033] In some embodiments of the present invention, in step S2, the first preset temperature is 900°C to 1000°C, and the first preset time is 3h to 8h. In this embodiment, by keeping warm at a specific temperature for a specific time, the magnetic phase in the first molten glass liquid can precipitate sufficiently, which is beneficial to reducing the welding temperature.

[0034] In some embodiments of the present invention, in step S1, the first target sintering temperature is 1100°C to 1400°C, and in step S1, the first time is 40 min to 120 min.

[0035] In some embodiments of the present invention, in step S5, the holding time of the heat preservation treatment is 10 min to 120 min.

[0036] In some embodiments of the present invention, in step S3, the preparation method of the glass-ceramic solder includes:

[0037] Step S31: Heat the second raw materials to a second target sintering temperature and hold for a second time to obtain a second molten glass liquid;

[0038] Step S32: Pour the second molten glass liquid into a second mold and then cool it to room temperature to obtain the glass-ceramic solder.

[0039] In some embodiments of the present invention, in step S31, the second target sintering temperature is 950°C to 1050°C; the second time is 40 min to 120 min.

[0040] The embodiments of the present invention also provide a ferrite joint, which is made by using the preparation method of the ferrite joint as described above.

[0041] The present invention will be further described below in conjunction with specific embodiments.

[0042] Example 1

[0043] A1. In a heating furnace, heat the first raw materials to the first target sintering temperature at a rate of 6°C / min and hold for the first time to obtain a first molten glass liquid; wherein, by mole fraction, the components of the first raw materials include: Bi2O3: 40 parts, B2O3: 35 parts, BaCO3: 12 parts, Fe2O3: 13 parts; the first target sintering temperature is 1200°C, and the first time is 60 min. After taking out the first molten glass liquid from the heating furnace and pouring it into a first mold, heat it to a first preset temperature and hold for a first preset time to fully precipitate the magnetic phase in the first molten glass liquid, and then cool it to room temperature to obtain a columnar magnetic glass-ceramic solder, and cut the magnetic glass-ceramic solder into first solder sheets; wherein, the first preset temperature is 950°C, the first preset time is 5.5 h, and the thickness of the first solder sheet is 1.5 mm.

[0044] A2. Heat the second raw material to the second target sintering temperature at a rate of 6 °C / min, and hold for the second time to obtain the second molten glass liquid; after pouring the second molten glass liquid into the second mold, cool it to room temperature to obtain a columnar glass-ceramic filler metal, and cut the glass-ceramic filler metal into second filler metal sheets; wherein, by mole fraction, the components of the second raw material include: Bi2O3: 40 parts, B2O3: 35 parts, ZnO: 20 parts; the second target sintering temperature is 1000 °C, and the second time is 60 min; the thickness of the second filler metal sheet is 1.5 mm.

[0045] A3. Prepare the ferrite component to be joined. The ferrite component to be joined is a five-layer structure formed by laminating a ferrite base material, a first filler metal sheet, a second filler metal sheet, and a ferrite base material from top to bottom in sequence; wherein, the material of the ferrite base material is yttrium iron garnet ferrite (YIG ferrite).

[0046] A4. Heat the ferrite component to be joined to the welding temperature and perform heat preservation treatment to obtain a ferrite joint; wherein, the welding temperature is 650 °C, and the time for the heat preservation treatment is 65 min.

[0047] Example 2

[0048] A1. In a heating furnace, heat the first raw material to the first target sintering temperature at a rate of 6 °C / min, and hold for the first time to obtain the first molten glass liquid; wherein, by mole fraction, the components of the first raw material include: Bi2O3: 25 parts, B2O3: 25 parts, BaCO3: 6 parts, Fe2O3: 6 parts; the first target sintering temperature is 1100 °C, and the first time is 120 min. After taking out the first molten glass liquid from the heating furnace and pouring it into the first mold, heat it to the first preset temperature and hold for the first preset time to enable the magnetic phase in the first molten glass liquid to precipitate sufficiently, and then cool it to room temperature to obtain a columnar magnetic glass-ceramic filler metal, and cut the magnetic glass-ceramic filler metal into first filler metal sheets; wherein, the first preset temperature is 900 °C, the first preset time is 8 h, and the thickness of the first filler metal sheet is 1.5 mm.

[0049] A2. Heat the second raw material to the second target sintering temperature at a rate of 6 °C / min, and hold for the second time to obtain the second molten glass liquid; after pouring the second molten glass liquid into the second mold, cool it to room temperature to obtain a columnar glass-ceramic filler metal, and cut the glass-ceramic filler metal into second filler metal sheets; wherein, by mole fraction, the components of the second raw material include: Bi2O3: 25 parts, B2O3: 25 parts, ZnO: 10 parts; the second target sintering temperature is 950 °C, and the second time is 120 min; the thickness of the second filler metal sheet is 1.5 mm.

[0050] A3. Prepare the ferrite component to be joined. The ferrite component to be joined is formed into a five-layer structure by laminating a ferrite base material, a second solder sheet, a first solder sheet, a second solder sheet, and a ferrite base material from top to bottom in sequence. Among them, the material of the ferrite base material is yttrium iron garnet ferrite (YIG ferrite).

[0051] A4. Heat the ferrite component to be joined to the welding temperature and perform heat preservation treatment to obtain a ferrite joint. Among them, the welding temperature is 600 °C, and the time for the heat preservation treatment is 120 min.

[0052] Example 3

[0053] A1. In a heating furnace, heat the first raw material to the first target sintering temperature at a rate of 6 °C / min and keep it warm for the first time to obtain the first molten glass liquid. Among them, calculated by mole fraction, the components of the first raw material include: Bi2O3: 55 parts, B2O3: 45 parts, BaCO3: 15 parts, Fe2O3: 20 parts. The first target sintering temperature is 1400 °C, and the first time is 40 min. After taking out the first molten glass liquid from the heating furnace and pouring it into the first mold, heat it to the first preset temperature and keep it warm for the first preset time to enable the magnetic phase in the first molten glass liquid to precipitate sufficiently, and then cool it to room temperature to obtain columnar magnetic microcrystalline glass solder. Cut the magnetic microcrystalline glass solder into the first solder sheet. Among them, the first preset temperature is 1000 °C, the first preset time is 3 h, and the thickness of the first solder sheet is 1.5 mm.

[0054] A2. Heat the second raw material to the second target sintering temperature at a rate of 6 °C / min and keep it warm for the second time to obtain the second molten glass liquid. Pour the second molten glass liquid into the second mold and then cool it to room temperature to obtain columnar microcrystalline glass solder. Cut the microcrystalline glass solder into the second solder sheet. Among them, calculated by mole fraction, the components of the second raw material include: Bi2O3: 55 parts, B2O3: 45 parts, ZnO: 30 parts. The second target sintering temperature is 1050 °C, the second time is 40 min, and the thickness of the second solder sheet is 1.5 mm.

[0055] A3. Prepare the ferrite component to be joined. The ferrite component to be joined is formed into a five-layer structure by laminating a ferrite base material, a second solder sheet, a first solder sheet, a second solder sheet, and a ferrite base material from top to bottom in sequence. Among them, the material of the ferrite base material is yttrium iron garnet ferrite (YIG ferrite).

[0056] A4. Heat the ferrite component to be joined to the welding temperature and perform heat preservation treatment to obtain a ferrite joint. Among them, the welding temperature is 700 °C, and the time for the heat preservation treatment is 10 min.

[0057] Comparative Example 1

[0058] It is different from Example 1 in that

[0059] Step A1 is as follows:

[0060] In a heating furnace, the first raw material is heated to a first target sintering temperature at a rate of 6 °C / min, and held for a first time to obtain a first molten glass; wherein, by mole fraction, the components of the first raw material include: Bi2O3: 55 parts, B2O3: 45 parts, BaCO3: 15 parts, Fe2O3: 20 parts; the first target sintering temperature is 1400 °C, and the first time is 40 min. After taking out the first molten glass from the heating furnace and pouring it into a first mold, it is cooled to room temperature to obtain a columnar magnetic microcrystalline glass solder, and the magnetic microcrystalline glass solder is cut into first solder pieces; wherein, the first preset temperature is 1000 °C, the first preset time is 3 h, and the thickness of the first solder piece is 1.5 mm.

[0061] Step A4 is as follows:

[0062] The ferrite component to be joined is heated to the welding temperature and subjected to heat preservation treatment to obtain a ferrite joint; wherein, the welding temperature is 950 °C, and the time of the heat preservation treatment is 65 min.

[0063] Comparative Example 2

[0064] B1. In a heating furnace, the first raw material is heated to a first target sintering temperature at a rate of 6 °C / min, and held for a first time to obtain a first molten glass; wherein, by mole fraction, the components of the first raw material include: Bi2O3: 40 parts, B2O3: 35 parts, BaCO3: 12 parts, Fe2O3: 13 parts; the first target sintering temperature is 1200 °C, and the first time is 60 min. After taking out the first molten glass from the heating furnace and pouring it into a first mold, it is heated to a first preset temperature and held for a first preset time to allow the magnetic phase in the first molten glass to precipitate sufficiently, and then cooled to room temperature to obtain a columnar magnetic microcrystalline glass solder, and the magnetic microcrystalline glass solder is cut into first solder pieces; wherein, the first preset temperature is 950 °C, the first preset time is 5.5 h, and the thickness of the first solder piece is 1.5 mm.

[0065] B2. Prepare a ferrite component to be joined, which is a three-layer structure formed by laminating a ferrite base material, a first solder piece, and a ferrite base material from top to bottom in sequence; wherein, the material of the ferrite base material is yttrium iron garnet ferrite (YIG ferrite).

[0066] B3. Heat the ferrite component to be joined to the welding temperature and carry out heat preservation treatment to obtain a ferrite joint; wherein, the welding temperature is 1000 °C and the time for the heat preservation treatment is 65 min.

[0067] Experimental example

[0068] Perform shear strength tests on the ferrite joints prepared in Examples 1 to 3 and Comparative Examples 1 to 2, and the results are shown in Table 1. It can be seen from Table 1 that compared with Comparative Examples 1 to 2, the welding temperature adopted in Examples 1 to 3 is lower and the shear strength of the obtained ferrite joints is higher.

[0069] Table 1

[0070] Number Welding Temperature (°C) Shear Strength (MPa) Example 1 650 96 Example 2 600 98 Example 3 700 94 Comparative Example 1 950 86 Comparative Example 2 1000 55

[0071] Although the present invention is disclosed as above, the protection scope of the present invention is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications will all fall within the protection scope of the present invention.

Claims

1. A preparation method of a ferrite joint, characterized in that Including: Step S1: Heat the first raw material to the first target sintering temperature and keep it warm for the first period of time to obtain the first molten glass liquid. Among them, calculated by mole fraction, the components of the first raw material include: Bi2O3: 25 to 55 parts, B2O3: 25 to 45 parts, BaCO3: 6 to 15 parts, Fe2O3: 6 to 20 parts; Step S2: After pouring the first molten glass liquid into the first mold, heat it to the first preset temperature and keep it warm for the first preset time to enable the magnetic phase in the first molten glass liquid to precipitate sufficiently, and then cool it to room temperature to obtain the magnetic microcrystalline glass solder, and make the magnetic microcrystalline glass solder into the first solder sheet; Step S3: Make the microcrystalline glass solder into the second solder sheet. Among them, the microcrystalline glass solder is made from the second raw material. Calculated by mole fraction, the components of the second raw material include: Bi2O3: 25 to 55 parts, B2O3: 25 to 45 parts, ZnO: 10 to 30 parts; Step S4: Prepare the ferrite component to be connected. The ferrite component to be connected is formed by laminating a ferrite base material, the second solder sheet, the first solder sheet, the second solder sheet, and the ferrite base material from top to bottom in sequence; Step S5: Heat the ferrite component to be connected to the welding temperature and perform heat preservation treatment to obtain a ferrite joint. Among them, the welding temperature is 600°C to 700°C.

2. The preparation method of the ferrite joint according to claim 1, wherein In the step S2, the first preset temperature is 900°C to 1000°C.

3. The preparation method of the ferrite joint according to claim 1, characterized in that, In the step S2, the first preset time is 3h to 8h.

4. The preparation method of the ferrite joint according to claim 1, characterized in that, In the step S1, the first target sintering temperature is 1100°C to 1400°C.

5. The preparation method of the ferrite joint according to claim 1, characterized in that, In the step S1, the first period of time is 40min to 120min.

6. The preparation method of the ferrite joint according to claim 1, wherein In the step S5, the time of the heat preservation treatment is 10min to 120min.

7. The preparation method of the ferrite joint according to claim 1, characterized in that, In the step S3, the preparation method of the microcrystalline glass solder includes: Step S31: Heat the second raw material to the second target sintering temperature and keep it warm for the second period of time to obtain the second molten glass liquid; Step S32: After pouring the second molten glass liquid into the second mold, cool it to room temperature to obtain the microcrystalline glass solder.

8. The preparation method of the ferrite joint according to claim 5, wherein, In the step S31, the second target sintering temperature is 950°C to 1050°C.

9. The preparation method of the ferrite joint according to claim 5, characterized in that, In the step S31, the second period of time is 40min to 120min.

10. A ferrite joint, characterized in that, Prepared by using the preparation method of the ferrite joint according to any one of claims 1 to 9.

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