Magnetic mixed material and preparation method thereof, polymer composite material, antenna and electronic equipment

Abstract

The invention provides a magnetic mixed material and a preparation method thereof, a polymer composite material, an antenna and electronic equipment, relates to the technical field of antenna materials, and aims to improve the plasticity of the antenna materials. The magnetic mixed material comprises a mixture of magnetic powder and viscosity adjusting powder, the particle size of the viscosity adjusting powder is smaller than that of the magnetic powder, and the material of the viscosity adjusting powder comprises a non-metal mineralizer. In the embodiment of the invention, the magnetic powder has better magnetism, and the viscosity adjusting powder is added into the magnetic powder, so that the flowability and viscosity of the formed magnetic mixed material can be adjusted. Furthermore, after the magnetic mixed material and the high polymer material are compounded, a high polymer composite material with higher plasticity and better mechanical property can be formed, and the magnetic mixed material and the high polymer composite material can be used as antenna substrate materials.

Description

Technical Field

[0001] The present application relates to the technical field of antenna materials, and in particular to a magnetic hybrid material and a preparation method thereof, a polymer composite material, an antenna and an electronic device. Background Art

[0002] With the rapid development of microwave communication technology, electronic devices are becoming more and more miniaturized, intelligent and functional. At present, due to the characteristics of high magnetic permeability and low loss, ferrite magnetic powder materials have become one of the key basic materials for antenna substrates, high-frequency microwave circuit boards, inductors, filters and other devices in electronic devices.

[0003] In the related art, ferrite magnetic materials use barium ferrite as the main formula, and the resonance peak position of the ferrite magnetic material is regulated by doping, so that the ferrite forms a monolithic structure material, and the ferrite monolithic structure is directly used as an antenna substrate. However, its mechanical properties are relatively brittle, and it is prone to cracking and fragility when used as a material. Summary of the invention

[0004] The purpose of the present application is to provide a magnetic hybrid material and a preparation method thereof, a polymer composite material, an antenna and an electronic device, which are used to solve the problem that ferrite magnetic materials are prone to cracking and fragility.

[0005] In a first aspect, a magnetic hybrid material is provided, comprising a mixture of magnetic powder and viscosity adjusting powder; wherein the particle size of the viscosity adjusting powder is smaller than the particle size of the magnetic powder, and the material of the viscosity adjusting powder comprises non-metallic minerals.

[0006] In the magnetic hybrid material provided in the embodiment of the present application, since the magnetic powder has good magnetic properties, the magnetic hybrid material has a higher magnetic permeability, for example, the magnetic permeability of the magnetic hybrid material can be greater than 1.2, and since the viscosity adjusting powder includes non-metallic minerals, the particle size of the viscosity adjusting powder is smaller than the particle size of the magnetic powder, so that the viscosity adjusting powder has the characteristic of adjusting the viscosity of the mixture, so the fluidity and viscosity of the magnetic hybrid material can be enhanced, and the mechanical properties of the magnetic hybrid material can be enhanced, so that when the magnetic hybrid material is compounded with a polymer material to form a polymer composite material, the particles of the polymer composite material have good processing fluidity and plasticity, for example, when the polymer composite material is made into an antenna substrate, it is easy to process and not easy to crack and damage, thereby enhancing the mechanical properties of the polymer composite material.

[0007] In some embodiments, the particle size of the viscosity regulating powder is in the range of 10nm-1um. In this embodiment, since the particle size of the viscosity regulating powder is small, the contact between the viscosity regulating powder and the magnetic powder is more complete, the bonding is better, and the viscosity of the magnetic hybrid material can be improved. Furthermore, after the magnetic hybrid material is added to the polymer material, the formed polymer composite material also has the characteristics of good plasticity and good fluidity.

[0008] In some embodiments, the doping ratio of the viscosity adjusting powder is 0.01%-10%. This arrangement facilitates the viscosity adjusting powder to adjust the viscosity of the mixture according to different doping ratios.

[0009] In some embodiments, the non-metallic minerals include aluminum or silicon oxide powders. In this embodiment, since the aluminum or silicon oxide powders added have the characteristics of low expansion coefficient and good wettability, the magnetic hybrid material is easy to mix with the polymer material.

[0010] In some embodiments, the magnetic powder includes a first magnetic powder and a second magnetic powder, and the particle size of the first magnetic powder is larger than the particle size of the second magnetic powder. In this embodiment, since the magnetic powder uses two powders with different particle sizes, the second magnetic powder is doped between the powder particles of the first magnetic powder, thereby increasing the compactness of the first magnetic powder and the second magnetic powder, thereby increasing the filling amount of the first magnetic powder and the second magnetic powder in the magnetic mixed material.

[0011] In some embodiments, the particle size range of the first magnetic powder is 3um-25um, and the particle size range of the second magnetic powder is 0.5um-10um. In this configuration, since the particle size range of the second magnetic powder is smaller than the particle size range of the first magnetic powder, the particle size selected for the first magnetic powder can be larger than that of the second magnetic powder, so that the particles of the second magnetic powder can be doped between the particles of the first magnetic powder to improve the mixing degree of the first magnetic powder and the second magnetic powder, thereby improving the magnetic permeability and dielectric constant of the magnetic mixed material.

[0012] In some embodiments, the particle size range of the first magnetic powder is 15um-25um, and the particle size range of the second magnetic powder is 4um-10um. In this way, since the particle size range of the first magnetic powder and the second magnetic powder is further reduced, it is convenient to select the first magnetic powder particle size and the second magnetic powder particle size with better mixing effect, thereby further improving the mixing degree of the magnetic powder and the viscosity adjustment powder.

[0013] In some embodiments, the doping ratio of the first magnetic powder is 50%-70%, and the doping ratio of the second magnetic powder is 10%-30%. In this way, the doping ratio of the first magnetic powder and the second magnetic powder is greater than that of the viscosity adjusting powder, so as to increase the filling amount of the first magnetic powder and the second magnetic powder in the magnetic hybrid material, thereby enhancing the magnetic properties of the magnetic hybrid material.

[0014] In some embodiments, the magnetic powder includes a first magnetic powder but does not include a second magnetic powder. The particle size range and doping ratio of the first magnetic powder can be referred to the description of the previous embodiment and will not be repeated here. Mixing the first magnetic powder and the viscosity adjustment powder to obtain a magnetic hybrid material can reduce the preparation steps of the magnetic hybrid material, thereby reducing the difficulty of preparing the magnetic hybrid material.

[0015] In some embodiments, the magnetic powder includes a second magnetic powder but does not include the first magnetic powder. The particle size range and doping ratio of the second magnetic powder can be referred to the description of the previous embodiment and will not be repeated here. Mixing the second magnetic powder and the viscosity adjustment powder to obtain a magnetic hybrid material can reduce the preparation steps of the magnetic hybrid material, thereby reducing the difficulty of preparing the magnetic hybrid material.

[0016] In some embodiments, the magnetic powder material includes Co 2 Z-type ferrite. This embodiment uses Co 2 Z-type ferrite is used as the material of magnetic powder. 2 Z-type ferrite has the characteristics of high magnetic permeability, low loss and good fluidity, which makes the magnetic powder have the characteristics of high magnetic permeability, low loss and good fluidity.

[0017] In some embodiments, the material of the magnetic powder includes BaCO 3 、SrCO 3 、Co 2 O 3 , Fe 2 O 3 In this embodiment, the above four ferrite oxides are further used as Co 2 Z-type ferrite is used as the raw material for preparing magnetic powder, so that the magnetic powder formed by ferrite oxide has Co 2 Z-type ferrite powder material has the characteristics of high magnetic permeability, low loss and good fluidity.

[0018] In a second aspect, a method for preparing a magnetic hybrid material is provided, comprising: forming a mixture of a magnetic powder and a viscosity adjusting powder, wherein the particle size of the viscosity adjusting powder is smaller than the particle size of the magnetic powder, and the material of the viscosity adjusting powder includes non-metallic minerals.

[0019] The method for preparing the magnetic hybrid material provided in the embodiment of the present application is used to prepare the aforementioned magnetic hybrid material, and the beneficial effects of the formed magnetic hybrid material will not be repeated here.

[0020] In some embodiments, the formation of a mixture of magnetic powder and viscosity adjusting powder includes: forming the magnetic powder including a first magnetic powder and a second magnetic powder, wherein the particle size of the first magnetic powder is larger than the particle size of the second magnetic powder; and mixing the magnetic powder including the first magnetic powder and the second magnetic powder with the viscosity adjusting powder according to a target doping ratio to obtain the mixture. In this embodiment, the first magnetic powder, the second magnetic powder and the viscosity adjusting powder can be mixed, and the particle sizes of the first magnetic powder and the second magnetic powder are different, so that the second magnetic powder can be doped in the particle size gap of the first magnetic powder, so that the first magnetic powder and the second magnetic powder are mixed more closely, and the filling amount of the magnetic powder in the magnetic hybrid material can be increased. Since the viscosity adjusting powder adjusts the viscosity of the magnetic hybrid material, it is convenient to increase the fluidity of the magnetic hybrid material after adding the polymer composite material. Therefore, the magnetic hybrid material prepared above has the characteristics of high magnetic permeability and good plasticity.

[0021] In some embodiments, the target doping ratio includes: the doping ratio of the first magnetic powder is 50%-70%, the doping ratio of the second magnetic powder is 10%-30%, and the doping ratio of the viscosity adjusting powder is 0.01%-10%. In this embodiment, the doping ratio of the first magnetic powder is greater than that of the second magnetic powder, and the doping ratio of the second magnetic powder is greater than that of the viscosity adjusting powder, so that the magnetic hybrid material can have a high magnetic permeability, and after the magnetic hybrid material is added to the polymer material, the polymer composite material formed has the characteristics of easy processing, non-fragile and good plasticity.

[0022] In some embodiments, the forming of the magnetic powder comprising the first magnetic powder and the second magnetic powder comprises: sintering the first magnetic powder raw material and the second magnetic powder raw material for the first time, so that the first magnetic powder raw material forms an incomplete crystal of the first magnetic powder, and the second magnetic powder raw material forms an incomplete crystal of the second magnetic powder; adding Bi to the incomplete crystal of the first magnetic powder and the incomplete crystal of the second magnetic powder. 2 O 3 The materials are mixed and then sintered for a second time so that the incomplete crystals of the first magnetic powder form complete crystals of the first magnetic powder, and the incomplete crystals of the second magnetic powder form complete crystals of the second magnetic powder; the complete crystals of the first magnetic powder and the complete crystals of the second magnetic powder are ground to obtain the magnetic powder containing the first magnetic powder and the second magnetic powder.

[0023] In this way, the first magnetic powder raw material and the second magnetic powder raw material are first sintered to obtain incomplete crystals of the first magnetic powder and incomplete crystals of the second magnetic powder, and then Bi 2 O 3 The material is added to the incomplete crystal of the first magnetic powder and the incomplete crystal of the second magnetic powder, so that Bi 2 O 3 The material physically reacts with the first magnetic powder and the second magnetic powder, facilitating the transformation of the incomplete crystals of the first magnetic powder and the incomplete crystals of the second magnetic powder into complete crystals, thereby increasing the resonance frequency of the first magnetic powder and the second magnetic powder, reducing magnetic loss, and adjusting the magnetic permeability and dielectric constant, thereby facilitating the second sintering to obtain complete crystals of the first magnetic powder and the second magnetic powder. The above preparation method can adjust the magnetic permeability and dielectric constant of the first magnetic powder and the second magnetic powder to adjust the electromagnetic parameters of the first magnetic powder and the second magnetic powder, and use a large amount of the first magnetic powder raw material and the second magnetic powder raw material to prepare the first magnetic powder and the second magnetic powder to achieve mass production. Therefore, the commercial value of the above preparation process is high, and the preparation cost is low. This embodiment is suitable for mass production.

[0024] In some embodiments, the first magnetic powder raw material and the second magnetic powder raw material both include BaCO 3 、SrCO 3 、Co 2 O 3 , Fe 2 O 3 In this way, ferrite oxide is used as the raw material of the magnetic powder. Since ferrite oxide has high magnetic permeability, the magnetic powder formed by ferrite oxide (ie, ferrite magnetic powder material) has the characteristic of high magnetic permeability.

[0025] In some embodiments, before the first magnetic powder raw material and the second magnetic powder raw material are sintered for the first time, the first magnetic powder raw material and the second magnetic powder raw material are added to a dispersant and then dried. In this embodiment, the addition of the dispersant facilitates the uniform dispersion of the first magnetic powder raw material and the second magnetic powder raw material, and after drying, other impurities are evaporated together with the dispersant, thereby facilitating the mixing of the first magnetic powder raw material and the second magnetic powder raw material.

[0026] In some embodiments, Bi is added to the incomplete crystals of the first magnetic powder and the incomplete crystals of the second magnetic powder. 2 O 3 After the materials are mixed and before the second sintering, the process further includes: grinding the incomplete crystal and Bi 2 O 3 A mixture of materials; will be with the Bi2 O 3 The incomplete crystals mixed with the materials are dried. 2 O 3 The mixture of materials is ground to reduce the particle size of the mixture, and the mixture is dried so that the dried mixture can be sintered to make Bi 2 O 3 The incomplete crystal resonance frequency of the material is increased and the magnetic loss is reduced, thereby achieving the adjustment of the electromagnetic parameters of the mixture.

[0027] In some embodiments, the Bi 2 O 3 The doping ratio of the material is in the range of 2.9% to 3.1%. 2 O 3 The material physically reacts with the first magnetic powder and the second magnetic powder to change the crystal structures of the first magnetic powder and the second magnetic powder, so that the incomplete crystals of the first magnetic powder and the incomplete crystals of the second magnetic powder are transformed into complete crystals.

[0028] In some embodiments, the forming of the magnetic powder comprising the first magnetic powder and the second magnetic powder includes: adding the first magnetic powder raw material and the second magnetic powder raw material to a solvent to prepare a mixed solution; heating the mixed solution to form a wet sol; drying the wet sol to form a dry gel; and sintering the dry gel to obtain the magnetic powder comprising the first magnetic powder and the second magnetic powder.

[0029] In this embodiment, the first magnetic powder raw material and the second magnetic powder raw material are added to a solvent for mixing and reacting, so that the first magnetic powder raw material and the second magnetic powder raw material react during heating and form a precipitate. The above preparation method mixes the first magnetic powder raw material and the second magnetic powder raw material in a solution, so that the first magnetic powder raw material and the second magnetic powder raw material are mixed more uniformly at the molecular microscopic level, thereby preparing a magnetic powder with higher quality.

[0030] In some embodiments, the steps of adding a first magnetic powder raw material and a second magnetic powder raw material to a solvent to prepare a mixed solution include: the first magnetic powder raw material and the second magnetic powder raw material both include metal nitrates, and the metal nitrates are mixed with a first solvent to prepare a metal nitrate mixed aqueous solution; citric acid is dissolved in a second solvent to prepare a citric acid aqueous solution, and the ratio of the citric acid to the metal nitrates is the same; and the metal nitrate mixed aqueous solution is mixed with the citric acid aqueous solution to obtain the mixed solution.

[0031] In this embodiment, a mixed solution is obtained by mixing a metal nitrate mixed aqueous solution and a citric acid aqueous solution, so that the mixed solution is acidic, and the pH value is adjusted after adding ammonia water to the mixed solution, so that the metal ions and hydroxide ions in the mixed solution react and combine to form a precipitate, so as to prepare a wet sol.

[0032] In some embodiments, the step of sintering the dry gel to obtain the first magnetic powder and the second magnetic powder includes: burning the dry gel; grinding and sintering the burned dry gel; grinding the sintered dry gel to obtain the magnetic powder containing the first magnetic powder and the second magnetic powder.

[0033] In this embodiment, the dry gel is burned to form flocs, which are incomplete crystals of the first magnetic powder and incomplete crystals of the second magnetic powder. The flocs are then ground and sintered to react to form complete crystals of the first magnetic powder and the second magnetic powder. The above preparation method is convenient for preparing a small amount of the first magnetic powder and the second magnetic powder with higher quality after the mixed reaction.

[0034] In some embodiments, in the step of grinding and sintering the burned dry gel, the dry gel is heated to a first temperature for sintering, and the sintered dry gel is cooled to a second temperature, the first temperature ranges from 1150°C to 1270°C, and the second temperature is less than the first temperature by 100°C. In this way, in the process of sintering the ground floccules, the temperature is lowered to the second temperature after sintering at the first temperature, so that the floccules can completely react at the first temperature and the second temperature to generate the first magnetic powder and the second magnetic powder, which can improve the purity of the first magnetic powder and the second magnetic powder.

[0035] In a third aspect, a polymer composite material is provided, comprising a mixture of a polymer material and a magnetic hybrid material, wherein the magnetic hybrid material is the magnetic hybrid material described in the first aspect.

[0036] In this embodiment, a polymer composite material is prepared by compounding a magnetic hybrid material with a polymer material, so that the polymer composite material has the characteristics of high magnetic permeability, good plasticity and low magnetic loss of the magnetic hybrid material.

[0037] In a fourth aspect, a method for preparing a polymer composite material is provided, wherein a polymer material is compounded with a magnetic hybrid material to form the polymer composite material as described in the third aspect.

[0038] The technical effects brought about by any possible implementation of the fourth aspect can refer to the technical effects brought about by the implementation of the third aspect mentioned above, and will not be repeated here.

[0039] In a fifth aspect, an antenna is provided, comprising an antenna substrate and a communication element disposed on the antenna substrate, wherein the antenna substrate is made of the polymer composite material as described in the third aspect.

[0040] The antenna substrate of the antenna of this embodiment is made of the polymer composite material of the third aspect, so that the antenna substrate has the characteristics of high magnetic permeability, good plasticity and low magnetic loss of the polymer composite material, and thus the antenna also has the characteristics of high magnetic permeability, good plasticity and low magnetic loss.

[0041] In a sixth aspect, an electronic device is provided, comprising a device body and the antenna described in the fifth aspect, wherein the antenna is installed on the device body.

[0042] The antenna of the electronic device of this embodiment has the characteristics of high magnetic permeability, good plasticity and low magnetic loss of the antenna substrate, and thus the electronic device also has the characteristics of high magnetic permeability, good plasticity and low magnetic loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 A structural block diagram of an electronic device provided in an embodiment of the present application;

[0044] Figure 2 A structural diagram of a mobile phone provided in an embodiment of the present application;

[0045] Figure 3 A cross-sectional schematic diagram of a material for making an antenna substrate provided in an embodiment of the present application to fill an antenna gap;

[0046] Figure 4 XRD diffraction patterns of jet milled samples and ball milled samples;

[0047] Figure 5 A flow chart of a method for preparing a magnetic hybrid material provided in an embodiment of the present application;

[0048] Figure 6 A flow chart of a solid phase sintering method of a first magnetic powder and a second magnetic powder provided in an embodiment of the present application;

[0049] Figure 7 A flow chart of a preparation method for the first sintering of a first magnetic powder raw material and a second magnetic powder raw material provided in an embodiment of the present application;

[0050] Figure 8 A flow chart of a preparation method between the first sintering and the second sintering of the first magnetic powder raw material and the second magnetic powder raw material provided in an embodiment of the present application;

[0051] Fig. 9 A flow chart of a sol-gel method for preparing a first magnetic powder and a second magnetic powder provided in an embodiment of the present application;

[0052] Fig.10 A flow chart of the first magnetic powder raw material and the second magnetic powder raw material forming a precipitate provided in an embodiment of the present application;

[0053] Fig.11 This is a flow chart of the preparation method of dry gel sintering provided in the embodiments of the present application. DETAILED DESCRIPTION

[0054] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0055] The terms "first", "second", etc. (if any) in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0056] An embodiment of the present application provides an electronic device, such as a mobile phone, a tablet computer, a laptop computer, a PDA, a wearable device (such as a smart watch, a smart bracelet, a pedometer), a personal digital assistant (PDA) and other mobile terminals, a smart TV, a smart camera and other smart home devices, or other desktop, laptop, notebook computer, ultra-mobile personal computer (UMPC), netbook, smart screen and other devices.

[0057] See also Figure 1 , Figure 1 The electronic device 1000 provided in the embodiment of the present application is a structural block diagram. The electronic device 1000 may include a device body 100 and an antenna 200 .

[0058] In the present application embodiment, the electronic device 1000 is taken as a mobile phone as an example. Figure 2 , Figure 2 A structural diagram of a mobile phone provided in an embodiment of the present application. The device body 100 may include a middle frame 101, a screen, a battery, a circuit board, a back cover, etc. of the mobile phone. The middle frame 101 includes a middle plate and a frame. The screen can be installed on one side of the middle plate, and accessories such as batteries and circuit boards can be installed on the other side. The back cover is used to snap together with the middle frame 101 to fix accessories such as batteries and circuit boards. The middle frame 101 is the frame of the mobile phone and supports the entire mobile phone. Therefore, the middle frame 101 can be made of metal material with a certain strength to support the entire mobile phone. The middle frame 101 has been processed many times, optionally such as polishing or computer numerical control (Computer Numerical Control, CNC) processing and drilling processing, etc. The mobile phone middle frame 101 can also be used to assemble some hardware such as a central processing unit (CPU), a card slot and an antenna.

[0059] For ease of description, the length direction of the device body 100 is defined as the Y1 axis. The width direction of the device body 100 is defined as the X1 axis. The thickness direction of the device body 100 is defined as the Z1 axis. It is understood that the coordinate system setting of the device body 100 can be flexibly set according to specific actual needs.

[0060] The antenna 200 includes an antenna substrate 201 and a communication element disposed on the antenna substrate 201. The communication element may include a radiation sheet, a feeder, and a ground wire. The middle plate of the mobile phone has an antenna area for mounting the antenna. The middle plate portion located in the antenna area may be made of plastic material. The use of plastic material facilitates the passage of electromagnetic waves, but a gap will be created between the plastic material and the metal. This is the common antenna gap between the middle plate and the frame of a mobile phone. For the antenna gap, in this embodiment, the material used to make the antenna substrate 201 may be used to fill it.

[0061] See also Figure 3 , Figure 3The schematic cross-sectional view of the material for making the antenna substrate 201 filling the antenna gap. The material for making the antenna substrate 201 is filled between the frame 1001 and the middle plate, and the material for making the antenna substrate 201 includes plastic 2001 and a polymer composite material block 2002. The plastic 2001 is filled between the frame 1001 and the middle plate, and a mounting groove is provided on the plastic 2001. The polymer composite material block 2002 is loaded into the mounting groove, and the polymer composite material block 2002 is fixed in the mounting groove by dispensing glue, so that a dispensing glue layer 2003 is formed between the peripheral wall of the polymer composite material block 2002 and the wall of the mounting groove, so as to fix the polymer composite material block 2002 to the frame 1001. The polymer composite material block 2002 is filled between the frame 1001 and the middle plate by plastic, so as to enhance the magnetic permeability of the antenna substrate. It should be noted that the polymer composite material block 2002 is formed by composite injection molding of a polymer material and a magnetic mixed material in a molten state.

[0062] As an important component of communication transmission, the antenna has high requirements for the loss and delay of signal transmission. In the related art, ferrite magnetic powder materials with high magnetic permeability and low loss are the key basic materials for antenna substrates. Therefore, in order to achieve low loss in signal transmission, ferrite magnetic powder materials with high magnetic permeability and low loss are used in antenna materials such as 2G communications. While reducing the physical size of the antenna, it can avoid the adverse effects of using magnetic powder materials with high dielectric constants on the antenna during operation, thereby improving the integration. Not only that, if ferrite magnetic powder materials with high magnetic permeability and low loss are applied to high-frequency microwave circuit boards, inductors, filters and other equipment, low loss and low delay of the transmission signal can be achieved, and microwave signals can be transmitted at high speed. It should be noted that the antenna of the present application is not limited to 2G communication, but can also be used in high-frequency microwave communication equipment such as 5G and 6G communications.

[0063] Common ferrite magnetic powder materials are divided into garnet, spinel and hexagonal ferrites. Different from garnet and spinel ferrites, hexagonal ferrites have higher uniaxial anisotropy and thus higher magnetocrystalline anisotropy. The structure is a hexagonal structure composed of alternating basic structural blocks S and R. The main component is BaFe 12 O 19 There are six configurations of permanent ferrites, namely M, W, X, Y, Z, and U. 2 Z ferrite, molecular formula is Ba 3 Co 2 Fe 24 O 41 (such as 3BaO*2CoO*12Fe 2 O 3), where the materials in brackets represent different metal positions, forming different magnetic moments. * is only used as a separator. Theoretically, the resonance frequency can reach 3.4GHz, which is a soft magnetic material that can be used in high-frequency fields.

[0064] In some implementations, the antenna substrate is made of ferrite material. Ferrite material has the characteristics of high magnetic permeability and low loss, which improves the antenna performance. However, the above-mentioned ferrite material adopts a ferrite monolithic structure, and the resonance peak position of the ferrite material is regulated by doping, so that the ferrite material is completely sintered into an antenna substrate for use. When the ferrite material is actually sintered into an antenna substrate, the ferrite material is brittle after sintering, so that the formed antenna substrate is prone to cracking and fragile, resulting in the problem of poor mechanical properties of the antenna substrate.

[0065] Based on this, the embodiments of the present application provide a magnetic hybrid material and a polymer composite material. Among them, the magnetic hybrid material has the characteristics of high magnetic permeability, low loss and good fluidity. The polymer composite material includes a magnetic hybrid material and a polymer material. The preparation method of the polymer composite material includes adding the magnetic hybrid material to the polymer material to form a mixture of the polymer composite material, and forming the polymer composite material into an antenna substrate by melt extrusion, injection molding, etc. The polymer composite material made of the magnetic hybrid material also has the characteristics of high magnetic permeability and low loss, thereby making the antenna substrate made of the polymer composite material have the characteristics of high magnetic permeability and low loss, and also has strong processability.

[0066] In the embodiments of the present application, there is no specific limitation on the amount of polymer material and magnetic hybrid material added.

[0067] The following is a further description of the magnetic hybrid material in conjunction with specific embodiments:

[0068] In order to obtain a magnetic hybrid material with high magnetic permeability, low loss and good fluidity, the magnetic hybrid material provided by the present application includes a mixture of magnetic powder and viscosity adjusting powder; wherein the particle size of the viscosity adjusting powder is smaller than the particle size of the magnetic powder, and the material of the viscosity adjusting powder includes non-metallic minerals. Since the particle size of the viscosity adjusting powder is smaller than the particle size of the magnetic powder, the volume of the magnetic powder in the magnetic hybrid material is larger, which is convenient for improving the magnetic properties of the magnetic hybrid material, and the viscosity adjusting powder is located between the powder particles of the magnetic powder, playing a lubricating role, so as to enhance the fluidity and plasticity of the magnetic powder and the viscosity adjusting powder after mixing.

[0069] The viscosity regulating powder adopts non-metallic minerals, which can effectively adjust the fluidity and viscosity of the magnetic hybrid material, so that after the magnetic hybrid material is compounded with the polymer material, the fluidity of the formed polymer composite material can be adjusted, thereby making the polymer composite material have stronger plasticity.

[0070] In addition, since the magnetic powder has good magnetic properties, the polymer composite material prepared from the magnetic hybrid material and the polymer material has high magnetic permeability and plasticity. Exemplarily, the dielectric constant of the magnetic hybrid material provided in the embodiment of the present application can be 3-8, the magnetic permeability can be 1.2-5, the dielectric loss tangent is less than or equal to 0.1, and the magnetic loss tangent is less than or equal to 0.2. It is known that the magnetic hybrid material has a lower dielectric constant, and the magnetic hybrid material maintains a lower dielectric constant after being compounded with the polymer material.

[0071] In some embodiments, due to Co 2 Z-type ferrite magnetic powder material has the characteristics of high magnetic permeability, low loss and good fluidity. 2 Z-type ferrite is used as magnetic powder material. 2 Z-type ferrite powder material is used as the raw material of magnetic hybrid material, which can make the magnetic hybrid material have the above-mentioned Co 2 Z-type ferrite magnetic powder material has the characteristics of high magnetic permeability and low loss.

[0072] The following is the 2 The identification method of magnetic hybrid materials made of Z-type ferrite is introduced as an example:

[0073] Figure 4 The XRD diffraction patterns of the jet mill sample and the ball mill sample are shown in Figure 2. The jet mill sample represents the jet milled magnetic powder material, and the ball mill sample represents the ball milled magnetic powder material. Figure 4 ,Co 2 The evidence of Z-type ferrite can be characterized by XRD (X-ray diffraction). The horizontal axis is the angle and the vertical axis is the signal intensity. By comparing the XRD diffraction pattern with the standard spectrum, the phase composition of the sample can be known.

[0074] For example, the XRD diffraction patterns of the jet milled sample and the ball milled sample were compared with the standard spectrum. By comparing the angles under the peaks, it can be seen that the diffraction patterns of the two samples are consistent with Co 2 The standard spectrum of Z-type ferrite is consistent, so it can be known that the measured sample is Co 2 Z-type ferrite.

[0075] In an embodiment of the present application, in order to obtain a magnetic mixed material with high fluidity, as a feasible implementation method, the particle size range of the viscosity adjusting powder is 10nm-1um, so that the particle size of the viscosity adjusting powder is smaller, so that the viscosity adjusting powder and the magnetic powder can be mixed more fully and have better bonding, thereby enhancing the fluidity of the magnetic powder and the viscosity adjusting powder after being added to the polymer material together.

[0076] In the embodiments of the present application, the particle size of the viscosity regulating powder only needs to be within a certain range, such as 10 nm-1 um, and the present application does not impose too many restrictions.

[0077] Since the addition of viscosity regulating powder can improve the viscosity of the magnetic hybrid material after adding the polymer material, that is, the fluidity, and the higher the doping ratio of the viscosity regulating powder, the higher the viscosity and the stronger the fluidity of the obtained magnetic hybrid material after adding the polymer material. As a feasible implementation method, in order to obtain a magnetic hybrid material with a higher modulus, the doping ratio of the viscosity regulating powder can be greater than or equal to 0.01%.

[0078] However, the high proportion of viscosity-adjusting powder added to the magnetic hybrid material can easily affect the electromagnetic parameters of the magnetic hybrid material. In order to ensure the high magnetic permeability and low loss characteristics of the magnetic hybrid material, as a feasible implementation method, the doping ratio of the viscosity-adjusting powder can be less than or equal to 10%.

[0079] In order to take into account the high magnetic permeability, low loss and fluidity of the magnetic hybrid material, as a feasible implementation method, the doping ratio of the viscosity-adjusting powder is 0.01%-10%.

[0080] In the embodiment of the present application, the material of the viscosity regulating powder is a non-metallic mineral, and the non-metallic mineral can be an oxide powder containing aluminum or silicon. The oxide of aluminum or silicon has the characteristics of low thermal expansion coefficient, good wettability, thermal stability and insulation. The oxide powder containing aluminum or silicon is used as the viscosity regulating powder. The oxide of aluminum or silicon can adjust the viscosity of the magnetic hybrid material and the polymer material after mixing. It can also make the thermal expansion coefficient of the magnetic hybrid material lower after the viscosity regulating powder and the magnetic powder are mixed into the magnetic hybrid material to avoid the expansion of the magnetic hybrid material when heated; and it helps to improve the wettability of the magnetic hybrid material so that the magnetic hybrid material and the polymer material are evenly mixed; furthermore, when the magnetic hybrid material is processed at high temperature, the magnetic hybrid material has good thermal stability to avoid the situation of reaction and gas release; furthermore, the magnetic hybrid material has good insulation, and the magnetic hybrid material maintains insulation properties after being compounded with the polymer material.

[0081] In other embodiments, non-metallic minerals may also include, for example, kaolin powder or titanium dioxide, talc powder, feldspar powder, calcite powder, quartz powder, heavy calcium powder, light calcium powder, fluorite powder, mica powder, phthalocyanine, lead chromium series pigments, pearlescent pigments, barite powder, graphite powder, gypsum powder and bentonite powder. The above powders all have the characteristics of low thermal expansion coefficient, good wettability, thermal stability and insulation, and are used as viscosity regulating powders. The above powders are used as viscosity regulating powders to adjust the viscosity of the magnetic hybrid material and the polymer material after mixing, that is, the fluidity.

[0082] The embodiment of the present application uses non-metallic minerals to make the magnetic hybrid material have better fluidity. Furthermore, in order to increase the magnetic properties of the magnetic hybrid material, as a feasible implementation method, the magnetic powder includes a first magnetic powder and a second magnetic powder, and the particle size of the first magnetic powder is larger than the particle size of the second magnetic powder. In the embodiment of the present application, the first magnetic powder and the second magnetic powder are made of the same material but have different particle sizes. By dividing the magnetic powder into two powders with different particle sizes, it is convenient to fill the second magnetic powder into the gaps between the particles of the first magnetic powder, so that the first magnetic powder and the second magnetic powder are more tightly combined, thereby increasing the filling amount of the magnetic powder in the magnetic hybrid material.

[0083] In the embodiment of the present application, the first magnetic powder and the second magnetic powder are mixed together with the viscosity adjusting powder according to the target doping ratio to form a magnetic hybrid material, so that the three powders are combined to achieve the characteristics of high magnetic permeability, low loss and good fluidity of the magnetic hybrid material.

[0084] In order to improve the mixing degree of magnetic powder and viscosity adjustment powder, as a feasible implementation method, the particle size range of the first magnetic powder is 3um-25um, and the particle size range of the second magnetic powder is 0.5um-10um. Since the second magnetic powder is located in the gap between the first magnetic powder particles, it can increase the compactness of the magnetic powder, so the first magnetic powder and the second magnetic powder have different particle sizes.

[0085] In order to take into account the compactness and high filling amount of the first magnetic powder and the second magnetic powder, as a feasible implementation method, the particle size range of the first magnetic powder is 15um-25um, and the particle size range of the second magnetic powder is 4um-10um. It is worth noting that the first magnetic powder can be a powder of a single particle size or a powder of mixed particle sizes. The second magnetic powder can be a powder of a single particle size or a powder of mixed particle sizes.

[0086] Since the addition of the first magnetic powder and the second magnetic powder can enhance the magnetic properties of the magnetic hybrid material, so that the magnetic hybrid material has the characteristic of high magnetic permeability, it can be understood that the more the first magnetic powder and the second magnetic powder are added, the better the magnetic properties of the magnetic hybrid material. In order to ensure the fluidity of the magnetic hybrid material and the plasticity after mixing with the polymer material, as a feasible implementation method, the doping ratio of the first magnetic powder can be greater than or equal to 50%, and the doping ratio of the second magnetic powder can be greater than or equal to 10%.

[0087] Although the more the first magnetic powder and the second magnetic powder are added to the magnetic hybrid material, the better the magnetic properties of the magnetic hybrid material, but in order to take into account the tightness of the viscosity adjustment powder with the first magnetic powder and the second magnetic powder, as a feasible implementation method, the doping ratio of the first magnetic powder can be less than or equal to 70%, and the doping ratio of the second magnetic powder can be less than or equal to 30%.

[0088] In order to take into account both the magnetism and compactness of the magnetic hybrid material, as a feasible implementation method, the doping ratio of the first magnetic powder is 50%-70%, and the doping ratio of the second magnetic powder is 10%-30%.

[0089] As a feasible implementation method, the materials of magnetic powder include BaCO 3 、SrCO 3 、Co 2 O 3 , Fe 2 O 3 .

[0090] In an embodiment of the present application, the materials of the first magnetic powder and the second magnetic powder both include the above-mentioned four substances, that is, the materials of the first magnetic powder and the second magnetic powder are the same, but the particle sizes are different, so as to increase the compactness of the magnetic powder through the first magnetic powder and the second magnetic powder with different particle sizes, and increase the filling amount of the first magnetic powder and the second magnetic powder in the polymer material.

[0091] In some feasible implementations, in order to save production costs and reduce preparation steps, the first magnetic powder and the viscosity adjusting powder are used alone to form the magnetic powder, or the second magnetic powder and the viscosity adjusting powder are used alone to form the magnetic powder.

[0092] In order to improve the magnetic properties of the first magnetic powder or the second magnetic powder after being mixed with the viscosity adjusting powder, in this implementation, when the first magnetic powder or the second magnetic powder is mixed with the viscosity adjusting powder, the relationship between the particle size and magnetic properties of the first magnetic powder and the second magnetic powder can be referred to in Table 1:

[0093] Table 1

[0094] Magnetic powder Particle size range Magnetic properties The first magnetic powder or the second magnetic powder 2um-8um 70％-80％ The first magnetic powder or the second magnetic powder 6um-12um 80％-90％ The first magnetic powder or the second magnetic powder 10um-18um 90％-95％ The first magnetic powder or the second magnetic powder 15um-35um 95％-100％ The first magnetic powder or the second magnetic powder 25um-40um 100％

[0095] This completes the description of mixing the first magnetic powder or the second magnetic powder with the viscosity adjusting powder.

[0096] In order to improve the bonding degree of the first magnetic powder, the second magnetic powder and the viscosity adjusting powder, in this implementation, the relationship between the particle sizes of the first magnetic powder, the second magnetic powder and the viscosity adjusting powder can be referred to in Table 2:

[0097] Table 2

[0098]

[0099] This completes the description of the three mixed particle size ratios of the first magnetic powder, the second magnetic powder and the viscosity adjusting powder.

[0100] An embodiment of the present application also provides a method for preparing a magnetic mixed material, which is used to form a mixture of magnetic powder and viscosity adjusting powder, wherein the particle size of the viscosity adjusting powder is smaller than the particle size of the magnetic powder, and the material of the viscosity adjusting powder includes non-metallic minerals.

[0101] See also Figure 5 , Figure 5 A flowchart of a method for preparing a magnetic hybrid material is provided as a feasible embodiment. In the preparation method, a mixture of magnetic powder and viscosity adjustment powder is formed, and the obtained mixture includes S1-S2.

[0102] S1. Forming a magnetic powder comprising a first magnetic powder and a second magnetic powder, wherein the particle size of the first magnetic powder is larger than the particle size of the second magnetic powder.

[0103] S2. Mixing the magnetic powder including the first magnetic powder and the second magnetic powder with the viscosity adjusting powder according to a target doping ratio to obtain a mixture.

[0104] The preparation method of the magnetic hybrid material in the embodiment of the present application adopts the method of mixing the first magnetic powder, the second magnetic powder and the viscosity adjusting powder to form the magnetic hybrid material. For example, as a feasible implementation method, the target doping ratio may include: the doping ratio of the first magnetic powder is 50%-70%, the doping ratio of the second magnetic powder is 10%-30%, and the doping ratio of the viscosity adjusting powder is 0.01%-10%.

[0105] The three kinds of powders are doped with each other, wherein the particle size of the first magnetic powder is larger than that of the second magnetic powder, the particle size of the second magnetic powder is larger than that of the viscosity adjusting powder, the doping ratio of the first magnetic powder is larger than that of the second magnetic powder, and the doping ratio of the second magnetic powder is larger than that of the viscosity adjusting powder, so as to achieve the highest doping ratio of the powder with the largest particle size and the lowest doping ratio of the powder with the smallest particle size, so as to ensure that the magnetic hybrid material has the characteristics of high magnetic permeability, low loss, good fluidity and strong plasticity after mixing with polymer materials.

[0106] Hereinafter, the preparation steps of the first magnetic powder and the second magnetic powder are introduced in combination with two specific embodiments.

[0107] Embodiment 1:

[0108] The raw materials of the first magnetic powder and the second magnetic powder are prepared by solid phase sintering method, which can ensure the mass production of the first magnetic powder and the second magnetic powder. Figure 6 , Figure 6 A flowchart of a solid phase sintering method for a first magnetic powder and a second magnetic powder is provided for a feasible embodiment. The solid phase sintering method forms a magnetic powder including the first magnetic powder and the second magnetic powder, including S11a to S13a.

[0109] S11a, sintering the first magnetic powder raw material and the second magnetic powder raw material for the first time, so that the first magnetic powder raw material forms an incomplete crystal of the first magnetic powder, and the second magnetic powder raw material forms an incomplete crystal of the second magnetic powder.

[0110] In order to improve the success rate of the first sintering of the first magnetic powder raw material and the second magnetic powder raw material, the present embodiment further optimizes the preparation method of the first magnetic powder and the second magnetic powder provided in the above embodiment. Figure 7 , Figure 7 A flowchart of a preparation method for first sintering of a first magnetic powder raw material and a second magnetic powder raw material provided in a feasible embodiment. S11a in the preparation method provided in the above embodiment may include S111a to S114a.

[0111] S111a, mixing the first magnetic powder raw material and the second magnetic powder raw material.

[0112] In the embodiment of the present application, the first magnetic powder raw material and the second magnetic powder raw material both include BaCO 3 、SrCO 3 、Co 2 O 3 , Fe 2 O 3 , and according to the molecular expression of magnetic hybrid material formula Ba 3-x Sr x Co 2 Fe 24 O 41 The raw materials are weighed according to the stoichiometric ratio of each element in (x=0.8-1.2) to proportion the content of the first magnetic powder raw material and the second magnetic powder raw material.

[0113] S112a, before sintering the first magnetic powder raw material and the second magnetic powder raw material for the first time, adding the first magnetic powder raw material and the second magnetic powder raw material into a dispersant.

[0114] However, before the first magnetic powder raw material and the second magnetic powder raw material are sintered, the large difference in particle sizes between the first magnetic powder raw material and the second magnetic powder raw material may easily affect the first sintering effect of the first magnetic powder raw material and the second magnetic powder raw material.

[0115] In order to solve the problem of large difference in particle size between the first magnetic powder raw material and the second magnetic powder raw material, the embodiment of the present application puts the weighed first magnetic powder raw material and the second magnetic powder raw material into a ball mill before the first sintering of the first magnetic powder raw material and the second magnetic powder raw material, and adds an appropriate amount of dispersant to mix the first magnetic powder raw material and the second magnetic powder raw material evenly. Then, a planetary ball mill is used to ball mill them to enhance the ball milling effect, so that the first magnetic powder raw material and the second magnetic powder raw material are ball milled more evenly, thereby facilitating the first sintering.

[0116] As a feasible implementation method, the dispersant in the embodiment of the present application is deionized water, and the first magnetic powder raw material and the second magnetic powder raw material are fully mixed and then ball milled. Compared with ordinary water, the use of deionized water can avoid other Na, Mg ions in the water from affecting the sintering results of the first magnetic powder raw material and the second magnetic powder raw material.

[0117] S113a, drying the uniformly mixed first magnetic powder raw material and second magnetic powder raw material.

[0118] In this step, the deionized water mixed with the first magnetic powder raw material and the second magnetic powder raw material is placed in an oven for drying, the drying temperature range is 100°C-130°C, and the drying time is 15h-24h, wherein the drying temperature of 100°C corresponds to a drying time of 24h, and the drying temperature of 130°C corresponds to a drying time of 15h, so as to fully dry the first magnetic powder raw material and the second magnetic powder raw material, and save the time and cost required for drying. During the drying process, the deionized water is volatilized, leaving only the first magnetic powder raw material and the second magnetic powder raw material.

[0119] S114a, sintering the dried first magnetic powder raw material and the second magnetic powder raw material for the first time.

[0120] In this step, the first magnetic powder raw material and the second magnetic powder raw material are placed in a muffle furnace and sintered for 3 hours. Since the sintering of the first magnetic powder raw material and the second magnetic powder raw material needs to be carried out in a high temperature environment, if the temperature is too low, it is easy for part of the first magnetic powder raw material and the second magnetic powder raw material to fail to be converted into incomplete crystals. As a feasible implementation method, in order to allow more of the first magnetic powder raw material and the second magnetic powder raw material to react and transform into incomplete crystals, the sintering temperature can be greater than or equal to 1220°C.

[0121] However, the higher the sintering temperature, the greater the impact on the transformation of the first magnetic powder raw material and the second magnetic powder raw material, which is easy to destroy the complete crystals of the first magnetic powder and the complete crystals of the second magnetic powder, and easy to generate mixed phases or impurities. As a feasible implementation method, in order to avoid the complete crystals of the first magnetic powder and the complete crystals of the second magnetic powder being destroyed due to excessively high temperatures during the sintering process, the sintering temperature can be less than or equal to 1270°C.

[0122] In order to 3 、SrCO 3 、Co 2 O 3 and Fe 2 O 3 Convert to Ba 3-x Sr x Co 2 Fe 24 O 41 , forming incomplete Co 2 Z-type ferrite crystal structure, as a feasible implementation method, the sintering temperature range of the first magnetic powder raw material and the second magnetic powder raw material is 1220℃-1270℃.

[0123] S12a, adding Bi to the incomplete crystals of the first magnetic powder and the incomplete crystals of the second magnetic powder 2 O 3 The materials are mixed and then sintered for the second time so that the incomplete crystals of the first magnetic powder form the complete crystals of the first magnetic powder, and the incomplete crystals of the second magnetic powder form the complete crystals of the second magnetic powder.

[0124] In this step, Bi 2 O 3 The material is in bulk, broken particles, and does not participate in the reaction. 2 O 3 The material acts physically on the first magnetic powder raw material and the second magnetic powder raw material to increase the resonance frequency of the magnetic powder sintered from the first magnetic powder raw material and the second magnetic powder raw material, reduce magnetic loss, and facilitate adjustment of the electromagnetic parameters of the magnetic powder to sinter to form complete crystals of the first magnetic powder and complete crystals of the second magnetic powder.

[0125] In order to transform the incomplete crystals of the first magnetic powder and the incomplete crystals of the second magnetic powder into complete crystals, the present embodiment further optimizes the preparation method of the magnetic hybrid material provided in the above embodiment. Figure 8 , Figure 8The flowchart of the preparation method of the first magnetic powder raw material and the second magnetic powder raw material before the second sintering is provided in the feasibility embodiment. S12a in the preparation method provided in the above embodiment is to add Bi to the incomplete crystals of the first magnetic powder and the incomplete crystals of the second magnetic powder. 2 O 3 After the materials are mixed and before the second sintering, S121a to S122a are also included:

[0126] S121a, incompletely ground crystal and Bi 2 O 3 A mixture of materials.

[0127] In this step, the incomplete crystal is mixed with Bi 2 O 3 The mixture was milled in a planetary ball mill, and deionized water was added to the ball mill to separate the incomplete crystals and Bi 2 O 3 The mixture exists in the form of mixed liquid in a ball mill for ball milling. In the ball mill, the incomplete crystals and Bi 2 O 3 The mass ratio of the mixture, the balls of the ball mill and the deionized water is 1:3:1. The ball milling time is 3-40 hours to separate the incomplete crystals from Bi 2 O 3 Mix the mixture thoroughly.

[0128] S122a、will be with Bi 2 O 3 The incomplete crystals of the mixed materials are dried.

[0129] In this step, the incomplete crystals after ball milling are 2 O 3 The mixture was placed in an oven for drying to evaporate the deionized water, leaving only the incomplete crystals after ball milling and Bi 2 O 3 The drying temperature range is 100℃-130℃, and the drying time is 15h-24h to separate the incomplete crystals from Bi 2 O 3 The mixture is thoroughly dried.

[0130] Furthermore, as a feasible implementation method, Bi 2 O 3 The doping ratio of the material can range from 2.9% to 3.1%.

[0131] S13a, grinding the complete crystals of the first magnetic powder and the complete crystals of the second magnetic powder to obtain magnetic powder containing the first magnetic powder and the second magnetic powder.

[0132] In this step, when grinding the complete crystals of the first magnetic powder and the complete crystals of the second magnetic powder, the grinding is carried out by air flow milling or ball milling. The particle size range of the mixed magnetic powder of the ground first magnetic powder and the second magnetic powder is 0.5um-2um. In order to mix the first magnetic powder and the second magnetic powder according to the doping ratio in the above embodiment, after grinding the first magnetic powder and the second magnetic powder, an air flow mill or ball milling device is used to automatically screen out the powder particles in the required particle size range to obtain the first magnetic powder and the second magnetic powder in the required particle size range in Table 2. The particle sizes of the first magnetic powder and the second magnetic powder that are not within the range of Table 2 can be again air flow milled or ball milled into powder particles of the required particle size, thereby reducing the waste of the first magnetic powder and the second magnetic powder.

[0133] Since the ball milling method requires the addition of deionized water and has more grinding steps, in some embodiments, a jet mill is used to grind the complete crystals of the first magnetic powder and the complete crystals of the second magnetic powder, eliminating the step of adding deionized water and making the grinding of the complete crystals of the first magnetic powder and the complete crystals of the second magnetic powder more convenient.

[0134] The fixed sintering method provided in the embodiment of the present application, through the first sintering method, the first magnetic powder raw material and the second magnetic powder raw material are reacted to obtain incomplete crystals of the first magnetic powder and incomplete crystals of the second magnetic powder, and then the incomplete crystals of the first magnetic powder and the incomplete crystals of the second magnetic powder are subjected to a second sintering to obtain complete crystals of the first magnetic powder and complete crystals of the second magnetic powder. The above preparation method reacts the first magnetic powder raw material and the second magnetic powder raw material in stages through two sinterings, which helps to improve the conversion of the first magnetic powder raw material into complete crystals and the conversion of the second magnetic powder raw material into complete crystals, thereby improving the success rate of preparing the first magnetic powder raw material and the second magnetic powder raw material into the first magnetic powder and the second magnetic powder, and reducing the incomplete crystal content of the first magnetic powder and the incomplete crystal content in the second magnetic powder.

[0135] The embodiments of the present application do not specifically limit the mixing method of the first magnetic powder, the second magnetic body and the viscosity adjusting powder. Any mixing method that can achieve the purpose of uniformly mixing the magnetic mixed materials can be applied to the technical solution provided in the embodiments of the present application. For example, as a feasible implementation method, the first magnetic powder and the second magnetic powder can be mixed by stirring.

[0136] Embodiment 2:

[0137] Another method for preparing a first magnetic powder raw material and a second magnetic powder raw material is provided, wherein the first magnetic powder raw material and the second magnetic powder raw material are prepared into the first magnetic powder and the second magnetic powder by a sol-gel method, which helps to improve the miscibility of the first magnetic powder and the second magnetic powder at the molecular microscopic level. Fig. 9 , Fig. 9 A flow chart of a sol-gel method for forming a first magnetic powder and a second magnetic powder is provided as a feasible embodiment. The sol-gel method is used to form a magnetic powder containing the first magnetic powder and the second magnetic powder, including S11b to S14b:

[0138] S11b, adding the first magnetic powder raw material and the second magnetic powder raw material into a solvent to prepare a mixed solution;

[0139] In order to fully mix the first magnetic powder raw material and the second magnetic powder raw material and form a precipitate, the present embodiment further optimizes the preparation method of the first magnetic powder and the second magnetic powder provided in the above embodiment, see Fig.10 , Fig.10 The flowchart of the first magnetic powder raw material and the second magnetic powder raw material forming a precipitate is provided for a feasible embodiment. S11b in the preparation method provided in the above embodiment may include S111b to S114b.

[0140] S111b: The first magnetic powder raw material and the second magnetic powder raw material both include metal nitrate, and the metal nitrate is mixed with a first solvent to prepare a metal nitrate mixed aqueous solution.

[0141] In this step, the metal nitrate includes Ba(NO 3 ) 2 、Sr(NO 3 ) 2 and Co(NO 3 ) 2 6H 2 O, Fe(NO 3 ) 3 9H 2 O, according to the main phase material Co 2 The molecular formula of Z-type ferrite is Ba 3-x Sr x Co 2 Fe 24 O 41The raw materials are weighed according to the stoichiometric ratio of each element in (x=0.8-1.2). In order to avoid introducing other impurities into the metal nitrate, the first solvent in the embodiment of the present application includes deionized water, so as to dissolve the above-mentioned metal nitrate in deionized water to prepare a metal nitrate mixed aqueous solution. Among them, the ratio of metal nitrate to deionized water ranges from 150mg / ml to 200mg / ml. As a feasible implementation method, the ratio of metal nitrate to deionized water can be 188mg / ml.

[0142] S112b, dissolving citric acid in a second solvent to prepare a citric acid aqueous solution, wherein the ratio of citric acid to metal nitrate is the same.

[0143] In this step, in order to avoid affecting the citric acid, the second solvent in the embodiment of the present application includes deionized water or pure water, so that the above-mentioned citric acid is weighed in a molar ratio of 1:1 with the metal nitrate, and the weighed citric acid is dissolved in deionized water or pure water to form a citric acid aqueous solution.

[0144] S113b, mixing the metal nitrate mixed aqueous solution with the citric acid aqueous solution to obtain a mixed solution.

[0145] In this step, when preparing the mixed solution, the citric acid aqueous solution needs to be slowly poured into the metal nitrate mixed aqueous solution, so that the citric acid aqueous solution gradually increases the acidity of the metal nitrate mixed aqueous solution, and a glass rod is used to stir during the pouring process. At this time, the citric acid does not react with the metal nitrate mixed aqueous solution.

[0146] S114b, adding ammonia water to the mixed aqueous solution of metal nitrate and citric acid to adjust the pH value of the mixed solution to 6.0-8.0.

[0147] In this step, ammonia water is added to neutralize the acidity of the metal nitrate mixed aqueous solution, so that the ammonia water reacts with the metal nitrate to react the metal ions to form a precipitate, so that the first magnetic powder raw material and the second magnetic powder raw material undergo a preliminary reaction at the molecular microscopic level to form a precipitate.

[0148] S12b, heating the mixed solution to form a wet sol.

[0149] In this step, the mixed solution is placed in a constant temperature water bath and heated and stirred continuously, so that the precipitation in the mixed aqueous solution increases rapidly, and gradually forms a wet sol state in the mixed aqueous solution. The heating temperature range of the constant temperature water bath is 70°C-90°C, and the heating time is 15h-20h. As a feasible implementation method, the heating temperature of the constant temperature water bath can be 90°C, and the heating time can be 17h, which helps the wet sol to maintain a sol state during mixing.

[0150] S13b, drying the wet sol to form a dry gel;

[0151] In this step, the wet gel in step S12b is placed in an oven for drying, the drying temperature range is 100°C-130°C, and the drying time is 2h-5h, so as to fully dry the moisture of the wet sol. During the drying process, the deionized water is volatilized, leaving only the dry gel, which is an incomplete crystal of the first magnetic powder and the second magnetic powder. As a feasible implementation method, the oven temperature is 130°C and the drying time is 3h, which helps the wet gel to be dried into a dry gel.

[0152] S14b, sintering the dry gel to obtain a magnetic powder comprising a first magnetic powder and a second magnetic powder.

[0153] In order to completely transform the dry gel into the complete crystals of the first magnetic powder and the complete crystals of the second magnetic powder, the present embodiment further optimizes the preparation method of sintering the dry gel into magnetic powder provided in the above embodiment, see Fig.11 , Fig.11 The flowchart of the preparation method of dry gel sintering provided in the feasibility embodiment. S14b in the preparation method provided in the above embodiment may include S141b to S143b:

[0154] S141b, burning the dry gel.

[0155] In this step, the dry gel is placed in a crucible and ignited with a spray gun so that the dry gel forms gray flocs after burning to further dry the incomplete crystals of the first magnetic powder and the incomplete crystals of the second magnetic powder. The resulting gray flocs are the incomplete crystals of the first magnetic powder and the second magnetic powder.

[0156] S142b, grinding and sintering the burned dry gel.

[0157] In this step, the burned dry gel is ground by air flow milling or ball milling to form a powdery dry gel of flocculent material. Then, the sintering aid is mixed with the ground powdery dry gel and added to a muffle furnace for sintering. The temperature is raised to the ferrite sintering temperature (1150°C-1270°C) at a heating rate of 200°C / h in the muffle furnace for sintering. The sintering temperature is kept for 3h-9h. Then, the temperature is lowered to a temperature value 100°C lower than the sintering temperature at a cooling rate of 200°C / h, and kept warm for 20 minutes until the muffle furnace is cooled, so that the incomplete crystals of the first magnetic powder and the incomplete crystals of the second magnetic powder are fully reacted to generate Co 2 Z-type ferrite block.

[0158] S143b, grinding the sintered dry gel to obtain magnetic powder including the first magnetic powder and the second magnetic powder.

[0159] In this step, the sintered dry gel is formed into a first magnetic powder and a second magnetic powder in a muffle furnace, namely, Co 2 The Z-type ferrite block is then sintered to form the Co 2 The Z-type ferrite block is ground again by air flow milling or ball milling, so that the particle size range of the first magnetic powder and the second magnetic powder after grinding is 0.5um-25um, and then the first magnetic powder and the second magnetic powder with the required particle size range as shown in Table 2 are obtained by screening.

[0160] The sol-gel method of the embodiment of the present application mixes the first magnetic powder raw material and the second magnetic powder raw material in a microscopic molecular structure by means of a solution mixing ratio, and forms precipitates and flocs through chemical reactions to form incomplete crystals of the first magnetic powder and incomplete crystals of the second magnetic powder, so that the first magnetic powder raw material and the second magnetic powder raw material are more evenly mixed at the microscopic level to form a sol state, thereby facilitating the sintering of the first magnetic powder raw material and the second magnetic powder raw material in the sol state to form complete crystals, and improving the quality of the first magnetic powder and the second magnetic powder obtained by the sol-gel method, thereby ensuring the high magnetic permeability characteristics of the first magnetic powder and the second magnetic powder.

[0161] Finally, the polymer material is combined with S13a or S14b to form a polymer composite material, and the polymer composite material can be made into an antenna substrate, so that the antenna substrate and the device body are assembled into an electronic device. Of course, the above steps S11a to S13a or S11b to S14b only list a process of making the magnetic hybrid material provided in the embodiment of the present application into an antenna. Of course, it can be understood that in some examples, more production steps can be included in order to make the antenna have better performance. Of course, in some examples, the magnetic hybrid material can also be used to make other structures of electronic devices, for example, for anti-metal radio frequency identification technology (RFID) tag products to improve the antenna signal recognition distance of the tag attached to the metal.

[0162] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A magnetic hybrid material, characterized in that: It comprises a mixture of magnetic powder and viscosity adjusting powder; wherein the particle size of the viscosity adjusting powder is smaller than that of the magnetic powder, and the material of the viscosity adjusting powder comprises non-metallic minerals.

2. The magnetic hybrid material according to claim 1, characterized in that: The particle size range of the viscosity regulating powder is 10nm-1um.

3. The magnetic hybrid material according to claim 1 or 2, characterized in that: The doping ratio of the viscosity regulating powder is 0.01%-10%.

4. The magnetic hybrid material according to any one of claims 1 to 3, characterized in that: The non-metallic minerals include aluminum or silicon oxide powder.

5. The magnetic hybrid material according to any one of claims 1 to 4, characterized in that: The magnetic powder includes a first magnetic powder and a second magnetic powder, and the particle size of the first magnetic powder is larger than the particle size of the second magnetic powder.

6. The magnetic hybrid material according to claim 5, characterized in that: The particle size range of the first magnetic powder is 3um-25um, and the particle size range of the second magnetic powder is 0.5um-10um.

7. The magnetic hybrid material according to claim 6, characterized in that: The particle size range of the first magnetic powder is 15um-25um, and the particle size range of the second magnetic powder is 4um-10um.

8. The magnetic hybrid material according to any one of claims 5 to 7, characterized in that: The doping ratio of the first magnetic powder is 50%-70%, and the doping ratio of the second magnetic powder is 10%-30%.

9. The magnetic hybrid material according to any one of claims 1 to 8, characterized in that: The material of the magnetic powder includes Co2Z type ferrite.

10. The magnetic hybrid material according to claim 9, characterized in that: The materials of the magnetic powder include BaCO3, SrCO3, Co2O3 and Fe2O3.

11. A method for preparing a magnetic hybrid material, characterized in that: include: A mixture of magnetic powder and viscosity adjusting powder is formed, wherein the particle size of the viscosity adjusting powder is smaller than the particle size of the magnetic powder, and the material of the viscosity adjusting powder includes non-metallic mineralization.

12. The preparation method according to claim 11, characterized in that: The method for forming a mixture of magnetic powder and viscosity adjusting powder comprises: forming the magnetic powder comprising a first magnetic powder and a second magnetic powder, wherein the particle size of the first magnetic powder is larger than the particle size of the second magnetic powder; The magnetic powder including the first magnetic powder and the second magnetic powder is mixed with the viscosity adjusting powder according to a target doping ratio to obtain the mixture.

13. The preparation method according to claim 12, characterized in that: The target doping ratios include: the doping ratio of the first magnetic powder is 50%-70%, the doping ratio of the second magnetic powder is 10%-30%, and the doping ratio of the viscosity adjusting powder is 0.01%-10%.

14. The preparation method according to claim 12 or 13, characterized in that: The forming of the magnetic powder comprising the first magnetic powder and the second magnetic powder comprises: Sintering the first magnetic powder raw material and the second magnetic powder raw material for the first time, so that the first magnetic powder raw material forms an incomplete crystal of a first magnetic powder, and the second magnetic powder raw material forms an incomplete crystal of a second magnetic powder; Adding Bi2O3 material to the incomplete crystals of the first magnetic powder and the incomplete crystals of the second magnetic powder and mixing them, and then performing a second sintering, so that the incomplete crystals of the first magnetic powder form the complete crystals of the first magnetic powder, and the incomplete crystals of the second magnetic powder form the complete crystals of the second magnetic powder; The complete crystals of the first magnetic powder and the complete crystals of the second magnetic powder are ground to obtain the magnetic powder including the first magnetic powder and the second magnetic powder.

15. The preparation method according to claim 14, characterized in that: The first magnetic powder raw material and the second magnetic powder raw material both include BaCO3, SrCO3, Co2O3, and Fe2O3.

16. The preparation method according to claim 14, characterized in that: Before the first magnetic powder raw material and the second magnetic powder raw material are sintered for the first time, the first magnetic powder raw material and the second magnetic powder raw material are added into a dispersant and then dried.

17. The preparation method according to claim 14, characterized in that: After adding Bi2O3 material to the incomplete crystals of the first magnetic powder and the incomplete crystals of the second magnetic powder and mixing them, and before performing the second sintering, the method further includes: grinding the mixture of the incomplete crystal and the Bi2O3 material; The incomplete crystals mixed with the Bi2O3 material are dried.

18. The preparation method according to claim 17, characterized in that: The doping ratio of the Bi2O3 material is in the range of 2.9%-3.1%.

19. The preparation method according to claim 12 or 13, characterized in that: The forming of the magnetic powder comprising the first magnetic powder and the second magnetic powder comprises: Adding the first magnetic powder raw material and the second magnetic powder raw material into a solvent to prepare a mixed solution; heating the mixed solution to form a wet sol; drying the wet sol to form a xerogel; The dry gel is sintered to obtain the magnetic powder including the first magnetic powder and the second magnetic powder.

20. The preparation method according to claim 19, characterized in that: The step of adding the first magnetic powder raw material and the second magnetic powder raw material into a solvent to prepare a mixed solution comprises: The first magnetic powder raw material and the second magnetic powder raw material both include metal nitrate, and the metal nitrate is mixed with a first solvent to prepare a metal nitrate mixed aqueous solution; Dissolving citric acid in a second solvent to prepare a citric acid aqueous solution, wherein the ratio of the citric acid to the metal nitrate is the same; The metal nitrate mixed aqueous solution is mixed with the citric acid aqueous solution to obtain the mixed solution.

21. The preparation method according to claim 19, characterized in that: The step of sintering the dry gel to obtain the first magnetic powder and the second magnetic powder comprises: burning the xerogel; Grinding and sintering the burned dry gel; The sintered dry gel is ground to obtain the magnetic powder including the first magnetic powder and the second magnetic powder.

22. The preparation method according to claim 21, characterized in that: In the step of grinding and sintering the burned dry gel, the dry gel is heated to a first temperature for sintering, and the sintered dry gel is cooled to a second temperature, the first temperature ranges from 1150°C to 1270°C, and the second temperature is 100°C less than the first temperature.

23. A polymer composite material, characterized in that: It comprises a mixture of a polymer material and a magnetic hybrid material, and the magnetic hybrid material is the magnetic hybrid material as described in any one of claims 1-10.

24. A method for preparing a polymer composite material, characterized in that: The polymer material and the magnetic hybrid material are compounded to form the polymer composite material as claimed in claim 23.

25. An antenna, characterized in that: It comprises an antenna substrate and a communication element arranged on the antenna substrate, and the antenna substrate is made of the polymer composite material as claimed in claim 23.

26. An electronic device, characterized in that: It comprises a device body and the antenna as claimed in claim 25, wherein the antenna is mounted on the device body.

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