Magnetic glass adhesive tape, preparation method of magnetic glass adhesive tape, connection method of magnetic device and connector of magnetic device

Abstract

The invention relates to the technical field of welding materials, in particular to a magnetic glass adhesive tape, a preparation method of the magnetic glass adhesive tape, a connection method of a magnetic device and a connector of the magnetic device. The magnetic glass adhesive tape disclosed by the invention is prepared from the following components in mole percent: 30 to 50 mol percent of Bi2O3, 30 to 40 mol percent of B2O3, 5 to 12 mol percent of BaCO3 and 5 to 15 mol percent of Fe2O3. By the adoption of the magnetic glass adhesive tape and the connecting process thereof, the problem that materials are difficult to control in the traditional welding process can be effectively solved, the defects of air holes, non-welding and the like in a connector are overcome, and the mechanical property and the electromagnetic property of the connector are synchronously improved.

Description

Technical Field

[0001] The present invention relates to the technical field of welding materials, and in particular to a magnetic glass adhesive tape and a preparation method thereof, a magnetic device connection method, and a magnetic device connection joint. Background Art

[0002] Glass-ceramic solder can modify the physical and chemical properties of joints by introducing precipitated phases during the soldering process, thereby adjusting the joint's physical and chemical properties. This holds broad application prospects in the soldering of functional materials. Magnetic glass-ceramic solder can be used for soldering magnetic devices, particularly ferrites. The magnetic phases generated after heat treatment impart magnetic properties to the solder, making it an excellent choice for joining magnetic components. Through its unique composition and crystallization properties, it addresses challenges such as thermal expansion mismatch, weak interfacial bonding, and high-temperature magnetic degradation in the joining of magnetic materials.

[0003] However, when directly using magnetic microcrystalline glass solder to connect magnetic devices, there is usually a problem of difficult to control the material, resulting in defects such as pores and unwelded joints, which in turn reduces the mechanical and electromagnetic properties of the magnetic device connection joints. Summary of the Invention

[0004] The problem solved by the present invention is to improve the mechanical properties and electromagnetic properties of a connection joint of a magnetic device.

[0005] In a first aspect, the present invention provides a magnetic glass adhesive tape comprising the following components in molar percentages: 30 to 50 mol % of Bi2O3, 30 to 40 mol % of B2O3, 5 to 12 mol % of BaCO3, and 5 to 15 mol % of Fe2O3.

[0006] Optionally, the magnetic glass adhesive tape has a thickness of 0.1 to 3 mm.

[0007] In a second aspect, the present invention provides a method for preparing the magnetic glass adhesive tape as described above, comprising:

[0008] Bi2O3, B2O3, BaCO3 and Fe2O3 are mixed uniformly in proportion, heated to a sintering temperature and kept warm to obtain a molten glass liquid, and then the molten glass liquid is poured into room temperature deionized water to obtain glass slag;

[0009] The glass slag is mixed with agate balls and anhydrous ethanol, and the mixture is ground and dried to obtain glass powder;

[0010] After mixing the glass powder and the plasticizer, vacuum degassing is performed to obtain a mixed slurry;

[0011] The mixed slurry is made into a blank, and then the blank is dried and peeled off to obtain a magnetic glass adhesive tape.

[0012] Optionally, the step of uniformly mixing Bi2O3, B2O3, BaCO3 and Fe2O3 in proportion, heating to a sintering temperature and keeping the temperature constant comprises:

[0013] The sintering temperature is 1200 to 1300° C., and the holding time is 1 to 2 hours.

[0014] Optionally, the Bi2O3, B2O3, BaCO3 and Fe2O3 are mixed uniformly in proportion, heated to the sintering temperature and kept warm, including: a heating rate of 3 to 10°C / min.

[0015] Optionally, the mass ratio of the glass slag, agate balls and anhydrous ethanol is 1:(1 to 2):(1 to 2).

[0016] Optionally, the mass ratio of the glass powder to the plasticizer is 1:(0.3 to 0.6), and the plasticizer is a mixture of terpineol and dibutyl phthalate.

[0017] In a third aspect, the present invention provides a method for connecting magnetic devices. The method for connecting magnetic devices is based on the magnetic glass adhesive tape described above, or based on the magnetic glass adhesive tape prepared by the method for preparing the magnetic glass adhesive tape described above, and the method for connecting magnetic devices comprises:

[0018] Placing the magnetic glass adhesive tape between two base materials of magnetic devices to be welded to obtain a body to be welded;

[0019] The body to be connected is first heated to 500 to 600° C., kept warm for 1 to 1.5 hours, and then continued to be heated to 900 to 1000° C., kept warm for 30 to 45 minutes to obtain a magnetic device connection joint.

[0020] Optionally, the heating rate of the body to be connected is 5 to 10° C. / min.

[0021] In a fourth aspect, the present invention further provides a magnetic device connection joint, which is prepared by the magnetic device connection method as described above.

[0022] The magnetic glass adhesive tape provided by the embodiment of the present invention is composed of Bi2O3, B2O3, BaCO3 and Fe2O3 in a specific ratio, wherein Bi2O3 and B2O3 are used to construct a bismuth boron glass matrix so that the magnetic glass adhesive tape can be in a glassy state, and BaCO3 and Fe2O3 are used to ensure that there is a magnetic phase (BaFe 12 O 19 ) precipitation, BaFe12 O 19 BaFe has the advantages of good chemical stability, good corrosion resistance, and high saturation magnetization. 12 O 19 It can provide stable magnetic support in ferrite connections, ensuring the stability and reliability of the connection. Experiments have found that the use of this magnetic microcrystalline glass solder can achieve ferrite connection at a welding temperature of 900°C to 1000°C, and the resulting magnetic device connection joint has high shear strength. In addition, the present invention makes the glass solder into the form of an adhesive tape, which simplifies the connection process and improves the connection efficiency. It can effectively avoid the problem of difficult material control in traditional welding processes, avoid defects such as pores and unwelded joints in the joints, and simultaneously improve the mechanical and electromagnetic properties of the joints. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 Schematic diagram of the hysteresis loop of the magnetic glass adhesive tape in Example 1 of the present invention. DETAILED DESCRIPTION

[0024] To make the above-mentioned objects, features, and advantages of the present invention more clearly understood, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. Although certain embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as being limited to the embodiments described herein. Instead, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the drawings and embodiments of the present invention are for illustrative purposes only and are not intended to limit the scope of protection of the present invention.

[0025] Unless otherwise defined, all technical and scientific terms used in the present invention have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0026] The term "including" and its variations used in this document are open inclusions, 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 other embodiment"; the term "some embodiments" means "at least some embodiments"; the term "optionally" means "optional embodiments". The relevant definitions of other terms will be given in the following description. It should be noted that the concepts of "first" and "second" mentioned in the present invention are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0027] Glass-ceramics is a composite material composed of a glass matrix and microcrystalline phases. Its specific physical and chemical properties can be achieved through controlled crystallization. As a solder, it requires an appropriate melting point, coefficient of thermal expansion (CTE), and good bonding with the base material. The magnetic properties of the magnetic crystalline phases that precipitate from magnetic glass-ceramics can affect the overall magnetic properties of the solder. Because magnetic devices, such as ferrites, inherently possess certain magnetic permeability and magnetic loss characteristics, if the magnetic phase precipitated in the solder has excessively high or low permeability, it can affect the continuity of the overall magnetic circuit, leading to increased magnetic losses or poor magnetic shielding effectiveness. Furthermore, the precipitation morphology of the magnetic phase (such as grain size and distribution uniformity) can also affect the mechanical strength of the solder. If the magnetic phase particles are too large or unevenly distributed, they can become stress concentration points, reducing the tensile strength of the joint. The magnetic properties of the interfacial reaction layer (a chemical reaction product between the solder and the ferrite) can also affect the bonding strength.

[0028] An embodiment of the present invention provides a magnetic glass adhesive tape comprising the following components in molar percentages: 30 to 50 mol% of Bi2O3, 30 to 40 mol% of B2O3, 5 to 12 mol% of BaCO3, and 5 to 15 mol% of Fe2O3.

[0029] The magnetic glass adhesive tape provided by the embodiment of the present invention is composed of Bi2O3, B2O3, BaCO3 and Fe2O3 in a specific ratio, wherein Bi2O3 and B2O3 are used to construct a bismuth boron glass matrix so that the magnetic glass adhesive tape can be in a glassy state, and BaCO3 and Fe2O3 are used to ensure that there is a magnetic phase (BaFe 12 O 19 ) precipitation, BaFe 12 O 19BaFe has the advantages of good chemical stability, good corrosion resistance, and high saturation magnetization. 12 O 19 It can provide stable magnetic support in ferrite connections, ensuring the stability and reliability of the connection. Experiments have found that the use of this magnetic microcrystalline glass solder can achieve ferrite connection at a welding temperature of 900°C to 1000°C, and the resulting magnetic device connection joint has high shear strength. In addition, the present invention makes the glass solder into the form of an adhesive tape, which simplifies the connection process and improves the connection efficiency. It can effectively avoid the problem of difficult material control in traditional welding processes, avoid defects such as pores and unwelded joints in the joints, and simultaneously improve the mechanical and electromagnetic properties of the joints.

[0030] In some optional embodiments, the thickness of the magnetic glass adhesive tape is 0.1 to 3 mm.

[0031] By controlling the thickness of the magnetic glass adhesive tape within 3 mm, the embodiment of the present invention can ensure that the adhesive fully fills the microscopic unevenness on the ferrite surface, reduces bubbles or gaps, and improves the integrity of the bonding interface. By controlling the thickness of the magnetic glass adhesive tape, it is conducive to forming a uniform connection layer, thereby balancing shear strength and flexibility, and can both withstand a certain mechanical load and alleviate the interface stress caused by thermal expansion differences.

[0032] Another embodiment of the present invention provides a method for preparing a magnetic glass adhesive tape, which specifically includes the following steps:

[0033] Step S1: Bi2O3, B2O3, BaCO3, and Fe2O3 are mixed uniformly in proportion, heated to a sintering temperature, and kept warm to obtain a molten glass liquid, which is then poured into room temperature deionized water to obtain glass slag. Specifically, before sintering, Bi2O3, B2O3, BaCO3, and Fe2O3 can be weighed and mixed according to a predetermined molar ratio. The mixed raw material powders are placed in a powder mixer and mixed at 100 rpm for 12 hours to ensure uniform mixing of the raw material powders. During the sintering process, the heating rate is 3 to 10°C / min, the sintering temperature is 1200 to 1300°C, and the holding time is 1 to 2 hours.

[0034] Step S2: The glass slag obtained in step S1 is mixed with agate balls and anhydrous ethanol, ground, and dried to obtain glass powder. Specifically, the mass ratio of the glass slag, agate balls, and anhydrous ethanol is 1:(1 to 2):(1 to 2). During grinding, the grinding jar can be placed in a planetary ball mill and ball milled for a predetermined time to obtain a glass powder suspension. The glass powder suspension is then dried in a drying oven to obtain glass powder.

[0035] In this step, the raw material, glass slag, is ground into a fine powder for mixing with other ingredients to improve the uniformity and performance of the adhesive tape. Agate balls act as a grinding medium during the ball milling process. Through high-speed rotation or vibration, the agate balls collide with the glass slag, crushing it into finer particles. Anhydrous ethanol, used as the liquid medium, helps prevent powder agglomeration during the milling process and reduces heat generated during the milling process, preventing material denaturation or clumping.

[0036] Step S3: After mixing the glass powder and the plasticizer, vacuum degassing is performed to obtain a mixed slurry. Specifically, the mass ratio of glass powder to plasticizer is 1: (0.3 to 0.6), and the plasticizer is mixed by terpineol and dibutyl phthalate in a mass ratio of 1: (0.3 to 0.5). The addition of the plasticizer can bring viscosity to the mixed slurry, improve the fluidity during the processing, and make the mixed material easier to form and process. The vacuum degassing time can be 60 to 120 minutes.

[0037] Step S4: The mixed slurry is formed into a blank, which is then dried and peeled off to obtain a magnetic glass adhesive tape. Specifically, the prepared mixed slurry is poured into a tape casting machine and rotated at a constant speed to form a blank. The blank is then dried at 180 to 200°C for 10 to 12 hours to obtain the magnetic glass adhesive tape. This step produces a magnetic glass adhesive tape with a uniform distribution of components.

[0038] Another embodiment of the present invention provides a method for connecting magnetic devices. The method is based on the magnetic glass adhesive tape described above, or a magnetic glass adhesive tape prepared using the method for preparing the magnetic glass adhesive tape described above. Specifically, the method includes:

[0039] Step M1: Place magnetic glass adhesive tape between the two magnetic component substrates to be welded, creating the bonded component. Specifically, during the actual welding process, the magnetic glass adhesive tape can be cut into a suitable shape based on the weld area to better fit the joining surface of the substrate. Furthermore, the magnetic glass adhesive tape, acting as an intermediate layer, ensures a better thermal expansion coefficient match with the substrate, reducing stress.

[0040] Step M2: The components to be connected are first heated to 500-600°C and held for 1-1.5 hours to completely volatilize the plasticizer. The temperature is then further raised to 900-1000°C and held for 30-45 minutes to form a magnetic device connection joint. Furthermore, during the welding process, the heating rate of the components to be connected is 5-10°C / min.

[0041] Another embodiment of the present invention provides a magnetic device connection joint, which is prepared using the magnetic device connection method described above. Specifically, the magnetic device can be a microwave ferrite device.

[0042] The present invention is described in detail below through specific examples and comparative examples:

[0043] Example 1

[0044] The magnetic glass adhesive tape in this embodiment includes the following components in molar percentages: 40 mol % of Bi2O3, 33 mol % of B2O3, 12 mol % of BaCO3, and 15 mol % of Fe2O3.

[0045] The preparation method of the magnetic glass adhesive tape in this embodiment includes:

[0046] Step (1): Bi2O3, B2O3, BaCO3 and Fe2O3 are mixed uniformly according to the above molar percentages, the uniformly mixed raw material powders are placed in a crucible, the crucible is placed in a heating furnace, heated to 1200°C at a heating rate of 5°C / min and kept warm for 60 minutes to obtain molten glass liquid, and then the molten glass liquid is poured into room temperature deionized water to obtain glass slag.

[0047] Step (2): The glass slag obtained in step (1) is mixed with agate balls and anhydrous ethanol in a mass ratio of 1:2:2 and placed in a grinding jar. The grinding jar is placed on a planetary ball mill and ball milled at a speed of 300 r / min for 20 hours to obtain a glass powder suspension. The glass powder suspension is then further placed in an air atmosphere drying oven and dried at 40° C. for 30 hours to obtain glass powder.

[0048] Step (3): The glass powder obtained in step (2) is mixed with a plasticizer in a mass ratio of 1:0.3 to prepare a mixed slurry. The mixed slurry is magnetically stirred for 120 minutes, and then placed in a vacuum degassing machine for 60 minutes to obtain a uniform mixed slurry. The plasticizer is a mixture of terpineol and dibutyl phthalate in a mass ratio of 1:0.3.

[0049] Step (4): pour the mixed slurry prepared in step (3) into a casting machine and rotate it at a constant speed to form a blank, and then dry the blank at 180° C. for 12 hours to finally obtain a magnetic glass adhesive tape.

[0050] The hysteresis loop of the magnetic glass adhesive tape in this embodiment is as follows: Figure 1 As shown, Figure 1 In the figure, the horizontal axis is the external magnetic field strength, and the vertical axis is the magnetization intensity of the magnetic glass adhesive tape. Figure 1 It can be seen that the magnetic glass adhesive tape obtained in this example has magnetism, and its saturation magnetization is close to 5 emu / g.

[0051] The process of applying the magnetic glass adhesive tape of this embodiment to ferrite bonding involves placing the magnetic glass adhesive tape between two ferrite base materials to be bonded, thereby forming a bonded joint. The bonded joints are then placed in a muffle furnace for welding. The temperature is first raised to 500°C and held for 60 minutes to completely volatilize the plasticizer. The temperature is then raised to 900°C and held for 30 minutes to form the ferrite joint. The heating rate during welding is 5°C / min.

[0052] Example 2

[0053] The difference between this embodiment and embodiment 1 is that the magnetic glass adhesive tape includes the following components in molar percentages: 40 mol % of Bi2O3, 35 mol % of B2O3, 10 mol % of BaCO3, and 15 mol % of Fe2O3.

[0054] Example 3

[0055] The difference between this embodiment and embodiment 1 is that the magnetic glass adhesive tape includes the following components in molar percentages: 50 mol % of Bi2O3, 40 mol % of B2O3, 5 mol % of BaCO3, 5 mol % of Fe2O3, and the balance of plasticizer.

[0056] Comparative Example

[0057] The difference between this comparative example and Example 1 is that in this comparative example, Bi2O3, B2O3, BaCO3 and Fe2O3 are mixed uniformly according to the above molar percentages, heated to obtain molten glass liquid, and then the molten glass liquid is annealed and cooled with the furnace to obtain magnetic microcrystalline glass solder, and then the magnetic microcrystalline glass solder is cut into slices and placed between the surfaces of the ferrite base materials to be welded for welding. The welding process is: first heat up to 500℃ and keep warm for 60 minutes, then heat up to 900℃ and keep warm for 30 minutes to obtain a ferrite connection joint.

[0058] The shear strength of the magnetic device connection joints in Examples 1 to 3 and the comparative example was tested, and the results are shown in Table 1. It can be seen from Table 1 that compared with the comparative example, the ferrite connection joints in Examples 1 to 3 have better shear strength.

[0059] Table 1 Shear strength data of ferrite connection joints in Examples 1 to 3 and Comparative Examples

[0060]

[0061] Although the present invention is disclosed as above, the protection scope of the present invention is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications will fall within the protection scope of the present invention.

Claims

1. A magnetic glass adhesive tape, characterized in that: The composition includes the following mole percentages: 30 to 50 mol% of Bi2O3, 30 to 40 mol% of B2O3, 5 to 12 mol% of BaCO3 and 5 to 15 mol% of Fe2O3.

2. The magnetic glass adhesive tape according to claim 1, wherein The thickness of the magnetic glass adhesive tape is 0.1 to 3 mm.

3. The method for preparing a magnetic glass adhesive tape according to claim 1 or 2, wherein: include: Bi2O3, B2O3, BaCO3 and Fe2O3 are mixed uniformly in proportion, heated to a sintering temperature and kept warm to obtain a molten glass liquid, and then the molten glass liquid is poured into room temperature deionized water to obtain glass slag; The glass slag is mixed with agate balls and anhydrous ethanol, and the mixture is ground and dried to obtain glass powder; After mixing the glass powder and the plasticizer, vacuum degassing is performed to obtain a mixed slurry; The mixed slurry is made into a blank, and then the blank is dried and peeled off to obtain a magnetic glass adhesive tape.

4. The method for preparing a magnetic glass adhesive tape according to claim 3, wherein: The method of uniformly mixing Bi2O3, B2O3, BaCO3 and Fe2O3 in proportion, heating to a sintering temperature and keeping the temperature constant comprises: The sintering temperature is 1200 to 1300° C., and the holding time is 1 to 2 hours.

5. The method for preparing a magnetic glass adhesive tape according to claim 3, wherein: The method comprises mixing Bi2O3, B2O3, BaCO3 and Fe2O3 uniformly in proportion, heating to a sintering temperature and keeping the temperature constant, wherein the heating rate is 3 to 10°C / min.

6. The method for preparing a magnetic glass adhesive tape according to claim 3, wherein: The mass ratio of the glass slag, the agate balls and the anhydrous ethanol is 1:(1 to 2):(1 to 2).

7. The method for preparing a magnetic glass adhesive tape according to claim 3, wherein: The mass ratio of the glass powder to the plasticizer is 1:(0.3 to 0.6), and the plasticizer is a mixture of terpineol and dibutyl phthalate.

8. A method for connecting magnetic devices, characterized in that: The method for connecting magnetic devices is based on the magnetic glass adhesive tape according to claim 1 or 2, or the magnetic glass adhesive tape prepared by the method for preparing the magnetic glass adhesive tape according to any one of claims 3 to 7, and the method for connecting magnetic devices comprises: Placing the magnetic glass adhesive tape between two base materials of magnetic devices to be welded to obtain a body to be welded; The objects to be connected are first heated to 500 to 600° C. and kept warm for 1 to 1.5 hours, and then continued to be heated to 900 to 1000° C. and kept warm for 30 to 45 minutes to obtain a magnetic device connection joint.

9. The method for connecting magnetic devices according to claim 8, wherein: The heating rate of the body to be connected is 5 to 10° C. / min.

10. A magnetic device connection joint, characterized in that: The magnetic device connection joint is prepared by the magnetic device connection method according to claim 8 or 9.

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