CN111462943A - Wireless charging coil enameled wire with magnetic nano ferrite material inner layer and preparation method thereof - Google Patents

Wireless charging coil enameled wire with magnetic nano ferrite material inner layer and preparation method thereof Download PDF

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CN111462943A
CN111462943A CN202010424367.1A CN202010424367A CN111462943A CN 111462943 A CN111462943 A CN 111462943A CN 202010424367 A CN202010424367 A CN 202010424367A CN 111462943 A CN111462943 A CN 111462943A
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magnetic nano
ferrite material
enameled wire
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CN111462943B (en
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李斌
阮霄
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Hangzhou Cunbao Technology Co ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/0009—Details relating to the conductive cores
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
    • H01B1/02—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of metals or alloys
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
    • H01B1/02—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of metals or alloys
    • H01B1/026—Alloys based on copper
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
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    • H01—ELECTRIC ELEMENTS
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    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/02—Disposition of insulation
    • H01B7/0208—Cables with several layers of insulating material
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    • H01—ELECTRIC ELEMENTS
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Abstract

The invention provides a wireless charging coil enameled wire with a magnetic nano ferrite material inner layer and a preparation method thereofaCobBcThe doped silver-copper alloy conductive middle layer and the piezomagnetic nanoparticle doped polyvinylpyrrolidone nanofiber ferromagnetic ceramic material inner layer; the inorganic insulating outer layer and the conductive inner layer are distributed in the magnetic nano ferrite material at intervalsThe angles of the interval distribution are 15-20 degrees on the arc outside the layer, and insulating materials are filled in the interval distribution pores; the weight ratio of the outer layer, the middle layer and the inner layer is (1-5) to (8-10) to (3-5). The magnetic nano ferrite solid core, the conductive middle layer and the insulating outer layer with piezoelectric performance provided by the invention can improve the flexibility and bending performance of the enameled wire, further improve the piezoelectric electricity generation performance of the enameled wire, and have high magnetostriction, high magnetoelectric conversion efficiency and high safety performance.

Description

Wireless charging coil enameled wire with magnetic nano ferrite material inner layer and preparation method thereof
Technical Field
The invention belongs to the technical field of enameled wires without electric coils, and particularly relates to an enameled wire with a magnetic nano ferrite material inner layer for a wireless charging coil and a preparation method thereof.
Background
In recent years, due to the unique advantages of wireless power transmission, the wireless power transmission has been widely applied in various fields, for example, consumer electronics such as mobile phones, tablet computers, household appliances, smart homes and human body implanted medical appliances have also been applied to high-power wireless charging systems such as robots and electric vehicles, and practical research on rail transit and magnetic levitation vehicles has been in progress. With the continuous maturation of WPT technology, the application field will be expanded continuously.
The quick renewal of electronic product, more and more external power cord not only occupies space, but also have various potential safety hazards, it is also relatively poor to outdoor bad weather change adaptability, the rapid development in recent years of wireless power transmission technique, huge advantage has been shown, the development of various electronic products, must require the convenience and the variety of its charging mode, the frequent plug of traditional limited charging technique, lead to the electric spark and have the danger of electrocution, messy power cord not only has the dust, still has contact loss. The product is made into a closed power supply by the application of the wireless charging technology, so that the space is saved, the advantages of water prevention, conductive point leakage prevention and the like are achieved, and a plurality of problems of contact charging are solved, so that the wireless charging technology has the advantages of higher safety and reliability and low maintenance cost.
However, most of the wireless charging coil enameled wires in the prior art are copper cores or copper-clad aluminum cores with an insulating layer structure, such as chinese patent 201020632225.6, or are only a material improvement of a certain layer of the enameled wires, such as 201810903736.8, and none of the above inventions can completely improve the magnetoelectric conversion efficiency of the wireless charging coil, and has low magnetostriction and potential safety hazards.
Disclosure of Invention
Aiming at the defects, the invention provides the wireless charging coil enameled wire which has the advantages of a magnetic nano ferrite solid core, a conductive middle layer and an insulating outer layer with piezoelectric performance, can improve the flexibility and bending performance of the enameled wire, further improves the piezoelectric performance of the enameled wire, and has high magnetostriction, high magnetoelectric conversion efficiency and high safety performance.
The invention provides the following technical scheme that the wireless charging coil enameled wire with the magnetic nano ferrite material inner layer sequentially comprises an inorganic insulating outer layer, a conductive middle layer and a magnetic nano ferrite material inner layer from outside to inside, wherein the inorganic insulating outer layer and the conductive inner layer are distributed on an arc on the outer side of the magnetic nano ferrite material inner layer at intervals, the interval distribution angle α is 15-20 degrees, and the interval distribution holes 44 are filled with insulating materials;
the inorganic insulating outer layer is an insulating high molecular polymer;
the conductive middle layer is FeaCobBcThe doped silver-copper alloy is characterized in that a is more than or equal to 30 and less than or equal to 50, b is more than or equal to 30 and less than or equal to 50, and c is more than or equal to 10 and less than or equal to 30;
the magnetic nano ferrite material of the inner layer of the magnetic nano ferrite material is (Fe)xA8-x)z-(Fe100-yBy)1-zThe piezomagnetic nanoparticle doped polyvinylpyrrolidone nanofiber ferromagnetic ceramic material is characterized in that an element A is one or more of Si, Ni, Al and Ge, an element B is one or more of Co, Ga or L a, x is more than or equal to 5 and less than 8, y is more than or equal to 40 and less than or equal to 60, and z is more than or equal to 0.35 and less than or equal to 0.5;
the weight ratio of the outer layer, the middle layer and the inner layer is (1-5) to (8-10) to (3-5).
Preferably, the spacing gaps of the inorganic insulating outer layer and the conductive middle layer are staggered.
Preferably, the insulating material filled in the spaced distribution pores 4 is polybutylene terephthalate;
preferably, the insulating high molecular polymer of the inorganic insulating outer layer is one or more of polysebacate decamethylenediamine, polyurethane, polyamide-imide or polyethylacrylate.
Preferably, the magnetic nano ferrite material comprises the following components in parts by weight:
Figure BDA0002498106340000021
preferably, the cellulose nano-fiber is one or more of hydroxyethyl nano-cellulose, carboxymethyl nano-cellulose, hydroxymethyl nano-cellulose or carboxyethyl nano-cellulose.
Preferably, the (Fe)xA8-x)z-(Fe100-yBy)1-zA method for preparing nanoparticles, comprising the steps of:
m1: FeSO (ferric oxide) is added4Dissolving the A element sulfate or A element sulfate hydrate in distilled water to form FeSO with the concentration of 10 mM-20 mM4Solution, 15 mM-25 mM A element sulfate solution, and the FeSO is added according to the molar ratio of x (8-x)4Mixing the solution with the A element sulfate solution;
m2: adding a sodium citrate solution with the concentration of 30 mM-35 mM into the mixed solution obtained in the step M1, adopting a NaOH solution with the concentration of 3M-5M to keep the pH of the solution at 3.5-4, adopting platinum as a counter electrode and Ag/AgCl as a reference electrode to carry out electrodeposition for 10 min-20 min at-1.20 v-1.00 v to form FexA8-xA nanocrystalline particle;
m3: FeSO (ferric oxide) is added4Dissolving the mixture in distilled water, and dissolving the mixture in the sulfate of the B element or the sulfate hydrate of the B element in the distilled water to form FeSO with the concentration of 10 mM-20 mM4A solution of 15 mM-25 mM element B sulfate, and FeSO in a molar ratio of (100-y): y4Mixing the solution with the B element sulfate solution;
m4: adding a sodium citrate solution with the concentration of 30 mM-35 mM into the mixed solution obtained in the step M3, adopting a NaOH solution with the concentration of 3M-5M to keep the pH of the solution at 3.5-4, adopting platinum as a counter electrode and Ag/AgCl as a reference electrode to carry out electrodeposition for 10 min-20 min at-1.20 v-1.00 v to form Fe100-yByA nanocrystalline particle;
m5: push buttonWeighing and mixing Fe obtained in the step of M2 according to the molar ratio of z (1-z)xA8-xNanocrystalline particles and Fe obtained in said M4 step100-yByDissolving nano crystal particles in a mixed solution of methanol and water with the volume ratio of (1:3.5) - (1:6), heating for 15min at the temperature of 60-80 ℃ and 150-180 rpm, heating and melting for 1-2 h at the temperature of 300-500 ℃ in vacuum, and forming (Fe) after the methanol is evaporatedxA8-x)z-(Fe100-yBy)1-zAnd (3) nanoparticles.
Preferably, the static potential of-0.8 v is carried out for 5min to 8min in the electrodeposition process in the M2 step and the M4 step, and the static pulse period is formed to respectively ensure FexA8-xNanocrystalline particles and Fe100-yByThe nanocrystal particles do not flake off.
Preferably, the preparation method of the magnetic nano ferrite material comprises the following steps:
n1: (Fe) of the weight componentxA8-x)z-(Fe100-yBy)1-zDissolving the nano particles in the methoxy ethanol with the weight components, uniformly stirring at the temperature of between 30 and 35 ℃ and at the speed of between 125 and 150r/min, adding the polyvinylpyrrolidone with the weight components, and continuously stirring at the temperature of between 30 and 35 ℃ and at the speed of between 125 and 150r/min for 20 to 30min to obtain a precursor of the polyvinylpyrrolidone doped with the nano particles;
n2: adding the fullerene and the cellulose nano-fiber in the weight components into the mixture obtained in the step N1, adding acetylacetone serving as a cross-linking agent in the weight components, and stirring at 65-75 ℃ for 15-20 min to obtain (Fe)xA8-x)z-(Fe100-yBy)1-zThe piezomagnetic nano-particle doped polyvinylpyrrolidone nano-fiber ferromagnetic ceramic material.
Preferably, Fe of the conductive middle layeraCobBcIn a doped silver-copper alloy, the FeaCobBcThe mass fraction of doping is 25% -30%.
Preferably, the FeaCobBcThe preparation method of the doped silver-copper alloy comprises the step of adopting a high vacuum sputtering platform to sputter the FeaCobBcThe radio frequency magnetron co-sputtering is carried out on a silver-copper alloy sheet, a glass sheet is used as a substrate, the target base distance is 120 mm-150 mm, and the target base distance is 7.5 × 10-5～8×10-5Sputtering was performed under vacuum of (1).
The invention also provides a preparation method of the wireless charging coil enameled wire with the magnetic nano ferrite material inner layer, which comprises the following steps:
1) immersing the magnetic nano ferrite material in the weight ratio in a dimethylformamide solution with the concentration of 20 mM-35 mM to form a magnetic nano ferrite material organic solution, and carrying out reaction at the temperature of 85-100 ℃ and the concentration of 30cm2/min～40cm2N of flow rate/min2Drying and curing in the atmosphere to form a solid magnetic nano ferrite material cylindrical core material with the diameter of 0.05-0.30 mm;
2) mixing said weight ratio of FeaCobBcMelting the doped silver-copper alloy material at 60-80 ℃, sleeving the solid magnetic nano ferrite material cylindrical core material obtained in the step 1) on a first shell model with 15-20-degree interval circular arcs, and immersing the solid magnetic nano ferrite material cylindrical core material in the molten FeaCobBcDoped silver-copper alloy material at 45-65 deg.c and 30cm2/min～40cm2N of flow rate/min2Drying and curing in the atmosphere to obtain a prefabricated body;
3) melting the insulating high molecular polymer with the weight ratio at 90-110 ℃, sleeving the solidified prefabricated body with the first shell model on a second shell model with 15-20-degree interval circular arcs, immersing the prefabricated body in the molten insulating high molecular polymer at 55-75 ℃ for 30cm2/min～40cm2N of flow rate/min2Drying and curing in the atmosphere; the outer diameter of the first shell model is equal to the inner diameter of the second shell model, so that an enameled wire precursor is obtained;
4) immersing the enameled wire precursor which is obtained in the step 3) and is provided with the first shell model and the second shell model after drying and curing into polybutylene terephthalate solution with the concentration of 75-85%, and after thermocuring for 45 min-1.5 h at 65-90 ℃, sequentially taking off the second shell model and the first shell model to obtain the wireless charging coil enameled wire with the inner layer of the magnetic nano ferrite material;
preferably, the first shell model and the second shell model in step 3) are distributed at intervals and staggered in arrangement.
The invention has the beneficial effects that:
1) the conductive middle layer adopts radio frequency magnetron co-sputtering technology to mix FeaCobBcIs doped into the silver-copper alloy to form 25 to 30 mass percent of FeaCobBcThe doped silver-copper alloy increases the conductive capability of the silver-copper alloy on one hand and has Fe with a nano crystal structure on the other handaCobBcThe doping of the silver-copper alloy changes the nano structure of the silver-copper alloy, so that the silver-copper alloy has a partial perovskite tetragonal crystal structure, the anti-electromagnetic interference capability of the silver-copper alloy is improved, the electromagnetic shielding capability is improved, the phenomenon of invalid magnetic coupling is prevented, the magnetic coupling efficiency is further improved, and the wireless charging efficiency is improved.
2) The enameled wire core material of the wireless charging coil is made of the magnetic nano ferrite material, so that the occurrence of an invalid magnetic coupling phenomenon can be avoided under the shielding of the conductive middle layer with anti-electromagnetic interference capability, the magnetoelectric conversion efficiency is improved, and the self-synthesized (Fe) with piezomagnetic property is adoptedxA8-x)z-(Fe100-yBy)1-zThe nanometer particles, polyvinylpyrrolidone with good affinity and surface activity, cellulose nanometer fibers and fullerene with good conductivity and hollow molecular structure form a piezomagnetic nanometer particle doped polyvinylpyrrolidone nanometer fiber ferromagnetic ceramic material, and the magnetism of the piezoelectric enameled wire core material can be further improved in a charge transfer system due to the disordered induced spin order of fullerene-tetrahedron, so that the magnetoelectric conversion efficiency is improved, and the finally formed polyvinylpyrrolidone nanometer fibers improve the magnetism of the piezoelectric enameled wire core material without the defect of the existence of polyvinylpyrrolidone nanometer fibersThe flexibility of the electric coil can have stronger bending capability, so that the electricity generating capability of the piezoelectric magnetoelectric coupling coil without electricity brought by the deformation of the electric coil is further improved.
3) Self-synthesized (Fe) with piezomagnetic propertiesxA8-x)z-(Fe100-yBy)1-zNanoparticles formed by the synthesis of two elements, element A and element B, with element FexA8-x)z-(Fe100-yBy)1-zEasy crystal axis of nano alloy particle<100>Oriented, electrodeposited nanowires have a strong along nanowire axis<110>Texture and randomness along the nanowire axis<100>And (4) orientation. The randomization of the easy axis of the crystal leads to negligible network magnetocrystalline anisotropy, so that the magnetism of the array is completely determined by the competition among exchange energy, demagnetization energy and Zeeman energy, and further a crystal structure with high magnetostriction is formed according to different magnetic coupling generating environments, and the magnetoelectric conversion efficiency is improved.
4) The insulating high molecular polymer is used as the outer layer of the enameled wire, so that the leakage phenomenon of the enameled wire can be obviously improved, and the safety performance of magnetic coupling radio transmission is further ensured.
5) The inorganic insulating outer layer and the conductive inner layer which are distributed on the arc outside the inner layer of the magnetic nano ferrite material at intervals of 15-20 degrees are uniformly spaced, so that a magnetoelectric coil generated by a magnetic coupling phenomenon can be effectively transmitted into the row of nano ferrite material, and the insulating material is filled in the spaced distribution holes 4, so that the safety performance of magnetic coupling radio transmission is further ensured, the magnetoelectric conversion efficiency can be ensured, the ineffective magnetoelectric effect is reduced, and meanwhile, the safety of radio transmission can be ensured.
Drawings
The invention will be described in more detail hereinafter on the basis of embodiments and with reference to the accompanying drawings. Wherein:
fig. 1 is a cross-sectional view of a wireless charging coil enameled wire provided in embodiment 1 of the invention;
fig. 2 is a cross-sectional view of a wireless charging coil enameled wire provided in embodiment 2 of the present invention;
fig. 3 is a cross-sectional view of a wireless charging coil enameled wire provided in embodiment 3 of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
Example 1
As shown in fig. 1, a structure diagram of a wireless charging coil enameled wire with a magnetic nano ferrite material inner layer provided in this embodiment is provided, the wireless charging coil enameled wire sequentially includes an inorganic insulating outer layer 1, a conductive middle layer 2 and a magnetic nano ferrite material inner layer 3 from outside to inside, the inorganic insulating outer layer 1 and the conductive inner layer 2 are both distributed on an outer side arc of the magnetic nano ferrite material inner layer 3 at intervals, the interval distribution of the inorganic insulating outer layer 1 and the interval distribution of the conductive inner layer 2 are staggered with each other, an angle α of the interval distribution is 15 °, and an interval distribution pore 4 is filled with an insulating material;
the inorganic insulating outer layer is insulating high molecular polymer polysebacic acid decanediamine;
the conductive middle layer is Fe30Co50B10A doped silver-copper alloy;
the magnetic nano ferrite material of the inner layer of the magnetic nano ferrite material is (Fe)5Si3)0.35-(Fe60Ga40)0.75The piezomagnetic nano-particle doped polyvinylpyrrolidone nanofiber ferromagnetic ceramic material;
the weight ratio of the outer layer to the middle layer to the inner layer is 1:10: 3.
As shown in fig. 1, the gaps between the inorganic insulating outer layer 1 and the conductive middle layer 2 are staggered, and the insulating material filled in the spaced distribution pores 4 is polybutylene terephthalate;
the magnetic nano ferrite material comprises the following components in parts by weight:
Figure BDA0002498106340000051
Figure BDA0002498106340000061
(Fe5Si3)0.35-(Fe60Ga40)0.75a method for preparing nanoparticles, comprising the steps of:
m1: FeSO (ferric oxide) is added4With Si (SO)4)2Dissolving in distilled water to obtain 10mM FeSO4Solution, 15mM concentration of Si (SO)4)2The FeSO is added into the solution according to the molar ratio of 5:34Solution with Si (SO)4)2Mixing the solutions;
m2: adding 30mM sodium citrate solution into the mixed solution obtained in the M1 step, maintaining the pH of the solution at 3.5 with 3M NaOH solution, performing electrodeposition at-1.20 v for 10min with platinum as a counter electrode and Ag/AgCl as a reference electrode to form Fe5Si3A nanocrystalline particle;
m3: FeSO (ferric oxide) is added4And Ga2(SO4)3·H2O is dissolved in distilled water respectively to form FeSO with the concentration of 10mM4Solution, Ga concentration 15mM2(SO4)3The FeSO is added into the solution according to the molar ratio of 60:404Solution and Ga2(SO4)3Mixing the solutions;
m4: adding 30mM sodium citrate solution into the mixed solution obtained in the M3 step, maintaining the pH of the solution at 3.5 with 3M NaOH solution, performing electrodeposition at-1.20 v for 10min with platinum as a counter electrode and Ag/AgCl as a reference electrode to form Fe60Ga40A nanocrystalline particle;
m5: weighing and mixing Fe obtained in the M2 step according to a molar ratio of 0.35:0.755Si3Nanocrystalline particles and Fe obtained in step M460Ga40Dissolving the nano crystal particles in a mixed solution of methanol and water with a volume ratio of 1:3.5, heating at 150rpm and 60 ℃ for 15min, then heating and melting at 300 ℃ in vacuum for 2h, and forming (Fe) after the methanol is evaporated5Si3)0.35-(Fe60Ga40)0.75And (3) nanoparticles.
The static potential of-0.8 v is carried out for 5 min-8 min in the electrodeposition process in the step M2 and the step M4, and the static pulse period is formed to respectively ensure Fe5Si3Nanocrystalline particles and Fe60Ga40The nanocrystal particles do not flake off.
(Fe5Si3)0.35-(Fe60Ga40)0.75The preparation method of the piezomagnetic nanoparticle-doped polyvinylpyrrolidone nanofiber ferromagnetic ceramic material comprises the following steps:
n1: 30 parts by weight of (Fe)5Si3)0.35-(Fe60Ga40)0.75Dissolving the nano particles in methoxy ethanol with weight components, uniformly stirring at 30 ℃ and 125r/min, adding polyvinylpyrrolidone with weight components, and continuously stirring at 30 ℃ and 125r/min for 20min to obtain a precursor of the nano particles doped with polyvinylpyrrolidone;
n2: adding 40 parts by weight of fullerene and 15 parts by weight of hydroxyethyl nanofiber to the mixture obtained in the step N1, adding 8 parts by weight of acetylacetone as a cross-linking agent, and stirring at 65 ℃ for 15min to obtain (Fe)5Si3)0.35-(Fe60Ga40)0.75The piezomagnetic nano-particle doped polyvinylpyrrolidone nano-fiber ferromagnetic ceramic material.
In which Fe of the conductive middle layer30Co50B10Of doped silver-copper alloys, Fe30Co50B10The mass fraction of doping was 25%.
Fe30Co50B10The preparation method of the doped silver-copper alloy comprises the following steps of adopting a high vacuum sputtering platform to sputter Fe30Co50B10Performing radio frequency magnetron co-sputtering on a silver-copper alloy sheet by using a glass sheet as a substrate, wherein the target base distance is 120mm at 8 × 10-5Sputtering was performed under vacuum of (1).
The embodiment also provides a preparation method of the wireless charging coil enameled wire with the magnetic nano ferrite material inner layer, which comprises the following steps:
1) immersing the magnetic nano ferrite material with the weight ratio of 3 in a dimethylformamide solution with the concentration of 20mM to form an organic solution of the magnetic nano ferrite material, and carrying out reaction at the temperature of 85 ℃ and the concentration of 30cm2N of flow rate/min2Drying and curing in the atmosphere to form a solid magnetic nano ferrite material cylindrical core material with the diameter of 0.05 mm;
2) mixing 10 weight percent of Fe30Co50B10Melting the doped silver-copper alloy material at 60 ℃, sleeving the cylindrical core material of the solid magnetic nano ferrite material obtained in the step 1) on a first shell model with 15-degree interval arcs, and immersing the cylindrical core material in the molten Fe30Co50B10Doped silver-copper alloy material, 30cm at 45 deg.C2N of flow rate/min2Drying and curing in the atmosphere to obtain a prefabricated body;
3) melting polysebacic acid decamethylenediamine with the weight ratio of 1 at 90 ℃, sleeving a solidified prefabricated body with a first shell model on a second shell model with 15-degree interval circular arcs, immersing the prefabricated body in a molten insulating high polymer at 55 ℃ and 30cm2N of flow rate/min2Drying and curing in the atmosphere; the first shell model and the second shell model are distributed at intervals and staggered at intervals, the outer diameter of the first shell model is equal to the inner diameter of the second shell model,obtaining an enameled wire precursor;
4) immersing the enameled wire precursor obtained in the step 3) with the first shell model and the second shell model after drying and curing into polybutylene terephthalate solution with the concentration of 75%, and after thermocuring for 45min at 65 ℃, sequentially taking off the second shell model and the first shell model to obtain a wireless charging coil enameled wire with a magnetic nano ferrite material inner layer;
example 2
As shown in fig. 2, the structure diagram of the wireless charging coil enameled wire with the magnetic nano ferrite material inner layer provided in this embodiment is that the wireless charging coil enameled wire sequentially includes, from outside to inside, an inorganic insulating outer layer 1, a conductive middle layer 2 and a magnetic nano ferrite material inner layer 3, wherein the inorganic insulating outer layer 1 and the conductive inner layer 2 are both distributed on an outer side arc of the magnetic nano ferrite material inner layer 3 at intervals, the interval distribution of the inorganic insulating outer layer 1 is consistent with that of the conductive inner layer 2, an angle α of the interval distribution is 18 °, and an insulating material is filled in an interval distribution pore 4;
the inorganic insulating outer layer is insulating high molecular polymer polyamide imide;
the conductive middle layer is Fe40Co30B20A doped silver-copper alloy;
the magnetic nano ferrite material of the inner layer of the magnetic nano ferrite material is (Fe)6Al2)0.4-(Fe50Co50)0.6The piezomagnetic nano-particle doped polyvinylpyrrolidone nanofiber ferromagnetic ceramic material;
the weight ratio of the outer layer, the middle layer and the inner layer is 3:8: 5.
As shown in fig. 2, the inorganic insulating outer layer 1 and the conductive middle layer 2 have consistent gap arrangement, and the insulating material filled in the gap distribution pores 4 is polybutylene terephthalate;
the magnetic nano ferrite material comprises the following components in parts by weight:
Figure BDA0002498106340000081
(Fe6Al2)0.4-(Fe50Co50)0.6a method for preparing nanoparticles, comprising the steps of:
m1: FeSO (ferric oxide) is added4Dissolving in distilled water, and adding Al (SO)4)3Dissolving in distilled water to form FeSO with concentration of 15mM4Solution, 20mM concentration of Al (SO)4)3Solution of FeSO in a molar ratio of 6:24Solution with Al (SO)4)3Mixing the solutions;
m2: adding 32mM sodium citrate solution into the mixed solution obtained in the M1 step, maintaining the pH of the solution at 3.8 by using 4M NaOH solution, performing electrodeposition for 15min at-1.1 v by using platinum as a counter electrode and Ag/AgCl as a reference electrode to form Fe6Al2A nanocrystalline particle;
m3: FeSO (ferric oxide) is added4Dissolving in distilled water, and adding CoSO4·7H2O is dissolved in distilled water to form FeSO with a concentration of 15mM4Solution, CoSO at 20mM concentration4Solution of FeSO in a molar ratio of 50:504Solution with CoSO4Mixing the solutions;
m4: adding 32mM sodium citrate solution into the mixed solution obtained in the M3 step, maintaining the pH of the solution at 3.8 by using 4M NaOH solution, performing electrodeposition for 15min at-1.10 v by using platinum as a counter electrode and Ag/AgCl as a reference electrode to form Fe50Co50A nanocrystalline particle;
m5: weighing and mixing Fe obtained in the M2 step according to a molar ratio of 0.4:0.66Al2Nanocrystalline particles and Fe obtained in step M450Co50Dissolving the nano crystal particles in a mixed solution of methanol and water with a volume ratio of 1:4.5, heating at 165rpm and 70 ℃ for 15min, heating and melting at 400 ℃ in vacuum for 1.5h, and evaporating methanol to obtain (Fe)6Al2)0.4-(Fe50Co50)0.6And (3) nanoparticles.
(Fe6Al2)0.4-(Fe50Co50)0.6Piezomagnetic nanoparticle blendThe preparation method of the hybrid polyvinylpyrrolidone nanofiber ferromagnetic ceramic material comprises the following steps:
n1: 38 parts by weight of (Fe)6Al2)0.4-(Fe50Co50)0.6Dissolving the nano particles in methoxy ethanol with weight components, uniformly stirring at 32 ℃ and 130r/min, adding 45 parts by weight of polyvinylpyrrolidone, and continuously stirring at 32 ℃ and 130r/min for 25min to obtain a precursor of the nano particles doped with the polyvinylpyrrolidone;
n2: adding 28 parts by weight of fullerene and 18 parts by weight of carboxymethyl cellulose nanofiber to the mixture obtained in the step N1, adding 12 parts by weight of acetylacetone as a crosslinking agent, and stirring at 70 ℃ for 18min to obtain (Fe)6Al2)0.4-(Fe50Co50)0.6The piezomagnetic nano-particle doped polyvinylpyrrolidone nano-fiber ferromagnetic ceramic material.
Fe of the conductive middle layer40Co30B20Of doped silver-copper alloys, Fe40Co30B20The mass fraction of doping was 28%.
Fe40Co30B20The preparation method of the doped silver-copper alloy comprises the following steps of adopting a high vacuum sputtering platform to sputter Fe40Co30B20Performing radio frequency magnetron co-sputtering on a silver-copper alloy sheet by using a glass sheet as a substrate, wherein the target base distance is 135mm and is 7.8 × 10-5Sputtering was performed under vacuum of (1).
The embodiment also provides a preparation method of the wireless charging coil enameled wire with the magnetic nano ferrite material inner layer, which is characterized by comprising the following steps of:
1) immersing the magnetic nano ferrite material with the weight ratio of 3 in a dimethylformamide solution with the concentration of 28.5mM to form an organic solution of the magnetic nano ferrite material, and carrying out reaction at the temperature of 90 ℃ and the concentration of 35cm2N of flow rate/min2Drying and curing in the atmosphere to form a solid magnetic nano ferrite material cylindrical core material with the diameter of 0.18 mm;
2) mixing 8% Fe by weight40Co30B20Melting the doped silver-copper alloy material at 70 ℃, sleeving the cylindrical core material of the solid magnetic nano ferrite material obtained in the step 1) on a first shell model with 18-degree interval arcs, and immersing the cylindrical core material in the molten Fe40Co30B20Doped silver-copper alloy material, 35cm at 55 deg.C2N of flow rate/min2Drying and curing in the atmosphere to obtain a prefabricated body;
3) melting the polyamide-imide with the weight ratio of 5 at 100 ℃, sleeving the solidified prefabricated body with the first shell model on a second shell model with 18-degree interval arcs, immersing the prefabricated body in the molten insulating high polymer at 55 ℃ and 35cm2N of flow rate/min2Drying and curing in the atmosphere; the first shell model and the second shell model are distributed at intervals and are placed at intervals, and the outer diameter of the first shell model is equal to the inner diameter of the second shell model, so that an enameled wire precursor is obtained;
4) immersing the enameled wire precursor obtained in the step 3) with the first shell model and the second shell model after drying and curing into a polybutylene terephthalate solution with the concentration of 80%, and after carrying out thermocuring for 1h at 80 ℃, sequentially taking off the second shell model and the first shell model to obtain a wireless charging coil enameled wire with a magnetic nano ferrite material inner layer;
example 3
As shown in fig. 3, the structure diagram of the wireless charging coil enameled wire with the magnetic nano ferrite material inner layer provided in this embodiment is that the wireless charging coil enameled wire sequentially includes, from outside to inside, an inorganic insulating outer layer 1, a conductive middle layer 2 and a magnetic nano ferrite material inner layer 3, wherein the inorganic insulating outer layer 1 and the conductive inner layer 2 are both distributed on an outer side arc of the magnetic nano ferrite material inner layer 3 at intervals, the interval distribution of the inorganic insulating outer layer 1 and the interval distribution of the conductive inner layer 2 are staggered, an interval distribution angle α is 20 °, and an interval distribution pore 4 is filled with an insulating material;
the inorganic insulating outer layer is made of polyethylacrylate;
the conductive middle layer is Fe50Co40B30A doped silver-copper alloy;
the magnetic nano ferrite material of the inner layer of the magnetic nano ferrite material is (Fe)7Ge)0.5-(Fe60La40)0.5The piezomagnetic nano-particle doped polyvinylpyrrolidone nanofiber ferromagnetic ceramic material;
the weight ratio of the outer layer to the middle layer to the inner layer is 5:9: 4.
Intervals between the inorganic insulating outer layer 1 and the conductive middle layer 2 are staggered, and insulating materials filled in the interval distribution pores 4 are polybutylene terephthalate;
the magnetic nano ferrite material comprises the following components in parts by weight:
Figure BDA0002498106340000101
wherein (Fe)7Ge)0.5-(Fe60La40)0.5A method for preparing nanoparticles, comprising the steps of:
m1: FeSO (ferric oxide) is added4Dissolving in distilled water, and adding Ge (SO)4)2Dissolving in distilled water to form FeSO with concentration of 20mM4Solution, 25mM Ge (SO)4)2Solution of FeSO in a molar ratio of 7:14Solution with Ge (SO)4)2Mixing the solutions;
m2: adding 35mM sodium citrate solution into the mixed solution obtained in the M1 step, maintaining the pH of the solution at 4 with 5M NaOH solution, performing electrodeposition at-1.00 v for 20min with platinum as a counter electrode and Ag/AgCl as a reference electrode to form Fe7Ge nanocrystalline particles;
m3: FeSO (ferric oxide) is added4Dissolving in distilled water, mixing L a2(SO4)3Dissolving in distilled water to form FeSO with concentration of 20mM4The solution, a B element sulfate solution with the concentration of 25mM, and FeSO according to the molar ratio of 60:404Solution and L a2(SO4)3Mixing the solutions;
m4: adding 35mM sodium citrate solution into the mixed solution obtained in the step M3, and adding 5M NaOH solutionMaintaining the pH of the solution at 4, performing electrodeposition at-1.00 v for 20min using platinum as a counter electrode and Ag/AgCl as a reference electrode to form Fe60La40A nanocrystalline particle;
m5: weighing and mixing Fe obtained in the step of M2 according to a molar ratio of 1:17Ge nanocrystalline particles and Fe from M4 step60La40Dissolving the nano crystal particles in a mixed solution of methanol and water with a volume ratio of 1:6, heating at 180rpm and 80 ℃ for 15min, heating and melting at 500 ℃ in vacuum for 2h, and forming (Fe) after the methanol is evaporated7Ge)0.5-(Fe60La40)0.5And (3) nanoparticles.
The static potential of-0.8 v is carried out for 5 min-8 min in the electrodeposition process in the step M2 and the step M4, and the static pulse period is formed to respectively ensure Fe7Ge nanocrystalline particles and Fe60La40The nanocrystal particles do not flake off.
(Fe7Ge)0.5-(Fe60La40)0.5The preparation method of the piezomagnetic nanoparticle-doped polyvinylpyrrolidone nanofiber ferromagnetic ceramic material comprises the following steps:
n1: 45 parts by weight of (Fe)7Ge)0.5-(Fe60La40)0.5Dissolving the nano particles in methoxy ethanol with weight components, uniformly stirring at 35 ℃ and 150r/min, adding 50 parts by weight of polyvinylpyrrolidone, and continuously stirring at 35 ℃ and 150r/min for 30min to obtain a precursor of the nano particles doped with the polyvinylpyrrolidone;
n2: adding 30 parts by weight of fullerene and 20 parts by weight of hydroxymethyl nanocellulose to the mixture obtained in the step N1, adding 15 parts by weight of acetylacetone as a crosslinking agent, and stirring at 75 ℃ for 20min to obtain (Fe)7Ge)0.5-(Fe60La40)0.5The piezomagnetic nano-particle doped polyvinylpyrrolidone nano-fiber ferromagnetic ceramic material.
Fe of the conductive middle layer50Co40B30Of doped silver-copper alloys, Fe50Co40B3030% of doping mass fraction, Fe50Co40B30The preparation method of the doped silver-copper alloy comprises the following steps of adopting a high vacuum sputtering platform to sputter Fe50Co40B30Performing radio frequency magnetron co-sputtering on a silver-copper alloy sheet by using a glass sheet as a substrate, wherein the target base distance is 150mm and is 7.5 × 10-5Sputtering was performed under vacuum of (1).
The embodiment also provides a preparation method of the wireless charging coil enameled wire with the magnetic nano ferrite material inner layer, which comprises the following steps:
1) immersing the magnetic nano ferrite material with the weight ratio of 5 into a dimethylformamide solution with the concentration of 35mM to form an organic solution of the magnetic nano ferrite material, and carrying out reaction at the temperature of 100 ℃ and the concentration of 40cm2N of flow rate/min2Drying and curing in the atmosphere to form a solid magnetic nano ferrite material cylindrical core material with the diameter of 0.30 mm;
2) mixing Fe with the weight ratio of 950Co40B30Melting the doped silver-copper alloy material at 80 ℃, sleeving the cylindrical core material of the solid magnetic nano ferrite material obtained in the step 1) on a first shell model with 20-degree interval circular arcs, and immersing the cylindrical core material in the molten Fe50Co40B30Doped silver-copper alloy material at 65 deg.C and 40cm2N of flow rate/min2Drying and curing in the atmosphere to obtain a prefabricated body;
3) melting the polyethylacrylate with the weight ratio of 4 at 110 ℃, sleeving the solidified prefabricated body with the first shell model on a second shell model with 20-degree interval arcs, immersing the prefabricated body in the molten insulating high polymer at 75 ℃ and 40cm2N of flow rate/min2Drying and curing in the atmosphere; the first shell model and the second shell model are distributed at intervals and staggered at intervals, and the outer diameter of the first shell model is equal to the inner diameter of the second shell model, so that an enameled wire precursor is obtained;
4) immersing the enameled wire precursor obtained in the step 3) with the first shell model and the second shell model after drying and curing into a polybutylene terephthalate solution with the concentration of 85%, carrying out thermocuring for 1.5h at 90 ℃, and then taking off the second shell model and the first shell model in sequence to obtain the wireless charging coil enameled wire with the inner layer of the magnetic nano ferrite material.
Comparative example 1
The wireless charging coil enameled wire with the inner layer of the magnetic nano ferrite material prepared in the embodiments 1-3 of the invention and the coating material prepared in the embodiment 3 of the Chinese patent application 201810903736.8 are adopted, and the enameled wire with the copper-clad aluminum composite wire core structure of the Chinese patent 201020632225.6 is used for magnetostriction strain measurement, a magnetostriction coefficient is measured by a resistance strain meter method, the instrument adopts a Nanjing poly navigation technology JH high-speed static strain measurement and analysis system, and the magnetoelectric conversion rate is calculated, and the results are shown in Table 1.
TABLE 1
Figure BDA0002498106340000111
Figure BDA0002498106340000121
According to table 1, the curvilinear charging coil enameled wire of the inner layer of the magnetic nano ferrite material has a high magnetostriction coefficient and a high magnetoelectric conversion rate, and cannot change due to the change of the magnetic field intensity and a large magnetostriction coefficient, so that the stability of magnetic coupling power generation is guaranteed.
Comparative example 2
The wireless charging coil enameled wire with the inner layer of the magnetic nano ferrite material prepared in the embodiments 1-3 of the invention and the enameled wire with the copper-clad aluminum composite wire core structure of Chinese patent application No. 201020632225.6, which is prepared from the coating material of embodiment 3 of Chinese patent application No. 201810903736.8, are used for measuring the piezoelectric constant and the leakage current; adopting a piezoelectric polarization device of Wuhan Bai Li Boke technology Limited, in a silicone oil environment, a polarization electric field E is 3.0KV/mm, a polarization temperature is 100 ℃, polarizing for 20min, recording leakage current in the polarization process, after the polarization is finished, treating the silicone oil on the surface of each sample of the embodiment with alcohol, standing for 24h, and measuring piezoelectric constants of different enameled wires at room temperature, 110Hz and 0.30N stress by using a Changzhou Zhongshi ZC2780 piezoelectric performance tester, wherein the results are shown in Table 2.
TABLE 2
Figure BDA0002498106340000122
According to the data, the curved charging coil enameled wire with the inner magnetic nano ferrite material layer has a high piezoelectric constant and a small leakage current, and can be placed on a charging base with the wireless charging coil in the application due to extrusion or a mobile phone, so that a strong magnetic coupling power generation effect is generated after the wireless charging coil is extruded, and the wireless charging efficiency can be improved.
Comparative example 3
The wireless charging coil enameled wire with the inner layer of the magnetic nano ferrite material prepared in the embodiments 1-3 of the invention and the enameled wire with the copper-clad aluminum composite core structure of the Chinese patent application 201810903736.8 in the embodiment 3 are used for carrying out the flexibility and bending performance test of the enameled wire, and the coiling property, namely the flexibility, of the enameled wire is tested by a low-stress extensometer according to the ASTM 1676 standard, and the results are shown in the table 3.
TABLE 3
Figure BDA0002498106340000131
Therefore, the curve charging coil enameled wire of the inner layer of the magnetic nano ferrite material provided by the application has good low-stress coiling property, namely flexibility, can adapt to large shape change, and generates effective piezoelectric magnetic coupling performance based on the change, so that the magnetoelectric conversion rate is improved.
While the invention has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. It is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.

Claims (10)

1. A wireless charging coil enameled wire with a magnetic nano ferrite material inner layer is characterized by sequentially comprising an inorganic insulating outer layer (1), a conductive middle layer (2) and a magnetic nano ferrite material inner layer (3) from outside to inside, wherein the inorganic insulating outer layer (1) and the conductive inner layer (2) are both distributed on an outer arc of the magnetic nano ferrite material inner layer (3) at intervals, the interval distribution angle α is 15-20 degrees, and insulating materials are filled in the interval distribution holes (4);
the inorganic insulating outer layer is an insulating high molecular polymer;
the conductive middle layer is FeaCobBcThe doped silver-copper alloy is characterized in that a is more than or equal to 30 and less than or equal to 50, b is more than or equal to 30 and less than or equal to 50, and c is more than or equal to 10 and less than or equal to 30;
the magnetic nano ferrite material of the inner layer of the magnetic nano ferrite material is (Fe)xA8-x)z-(Fe100-yBy)1-zThe piezomagnetic nanoparticle doped polyvinylpyrrolidone nanofiber ferromagnetic ceramic material is characterized in that an element A is one or more of Si, Ni, Al and Ge, an element B is one or more of Co, Ga or L a, x is more than or equal to 5 and less than 8, y is more than or equal to 40 and less than or equal to 60, and z is more than or equal to 0.35 and less than or equal to 0.5;
the weight ratio of the outer layer, the middle layer and the inner layer is (1-5) to (8-10) to (3-5).
2. The enameled wire for wireless charging coil with inner magnetic nano ferrite material layer in accordance with claim 1, wherein the spacing gaps of the inorganic insulating outer layer (1) and the conductive middle layer (2) are staggered.
3. The enameled wire for wireless charging coils with the inner layer of magnetic nano ferrite material in claim 1, wherein the insulating material filled in the spaced-apart pores 4 is polybutylene terephthalate;
preferably, the insulating high molecular polymer of the inorganic insulating outer layer is one or more of polysebacate decamethylenediamine, polyurethane, polyamide-imide or polyethylacrylate.
4. The enameled wire for the wireless charging coil with the inner magnetic nano ferrite material layer as claimed in claim 1, wherein the magnetic nano ferrite material comprises the following components by weight:
Figure FDA0002498106330000021
5. the enameled wire for wireless charging coil with inner layer of magnetic nano ferrite material in claim 4, wherein the (Fe) is in a form of a powderxA8-x)z-(Fe100-yBy)1-zA method for preparing nanoparticles, comprising the steps of:
m1: FeSO (ferric oxide) is added4Dissolving the A element sulfate or A element sulfate hydrate in distilled water to form FeSO with the concentration of 10 mM-20 mM4Solution, 15 mM-25 mM A element sulfate solution, and the FeSO is added according to the molar ratio of x (8-x)4Mixing the solution with the A element sulfate solution;
m2: adding a sodium citrate solution with the concentration of 30 mM-35 mM into the mixed solution obtained in the step M1, adopting a NaOH solution with the concentration of 3M-5M to keep the pH of the solution at 3.5-4, adopting platinum as a counter electrode and Ag/AgCl as a reference electrode to carry out electrodeposition for 10 min-20 min at-1.20 v-1.00 v to form FexA8-xA nanocrystalline particle;
m3: FeSO (ferric oxide) is added4Dissolving the B element sulfate or B element sulfate hydrate in distilled water to form FeSO with the concentration of 10 mM-20 mM4A solution of 15 mM-25 mM element B sulfate, and FeSO in a molar ratio of (100-y): y4Mixing the solution with the B element sulfate solution;
m4: adding a sodium citrate solution with the concentration of 30 mM-35 mM into the mixed solution obtained in the step M3, adopting a NaOH solution with the concentration of 3M-5M to keep the pH of the solution at 3.5-4, adopting platinum as a counter electrode and Ag/AgCl as a reference electrode to carry out electrodeposition for 10 min-20 min at-1.20 v-1.00 v to form Fe100-yByA nanocrystalline particle;
m5: weighing and mixing Fe obtained in the M2 step according to the molar ratio of z (1-z)xA8-xNanocrystalline particles and Fe obtained in said M4 step100-yByDissolving nano crystal particles in a mixed solution of methanol and water with the volume ratio of (1:3.5) - (1:6), heating for 15min at the temperature of 60-80 ℃ and 150-180 rpm, heating and melting for 1-2 h at the temperature of 300-500 ℃ in vacuum, and forming (Fe) after the methanol is evaporatedxA8-x)z-(Fe100-yBy)1-zAnd (3) nanoparticles.
6. The enameled wire for wireless charging coil with inner layer of magnetic nano ferrite material in claim 5, wherein the static potential of-0.8 v is applied for 5 min-8 min during the electrodeposition in both M2 step and M4 step, and the static pulse period is formed to ensure Fe respectivelyxA8-xNanocrystalline particles and Fe100-yByThe nanocrystal particles do not flake off.
7. The enameled wire for wireless charging coils with the inner layer of magnetic nano ferrite material in claim 4 is characterized in that the preparation method of the magnetic nano ferrite material comprises the following steps:
n1: (Fe) of the weight componentxA8-x)z-(Fe100-yBy)1-zDissolving the nano particles in the methoxy ethanol with the weight components, uniformly stirring at the temperature of between 30 and 35 ℃ and at the speed of between 125 and 150r/min, adding the polyvinylpyrrolidone with the weight components, and continuously stirring at the temperature of between 30 and 35 ℃ and at the speed of between 125 and 150r/min for 20 to 30min to obtain the precursor of the polyvinylpyrrolidone doped with the nano particles；
N2: adding the fullerene and the cellulose nano-fiber in the weight components into the mixture obtained in the step N1, adding acetylacetone serving as a cross-linking agent in the weight components, and stirring at 65-75 ℃ for 15-20 min to obtain (Fe)xA8-x)z-(Fe100-yBy)1-zThe piezomagnetic nano-particle doped polyvinylpyrrolidone nano-fiber ferromagnetic ceramic material.
8. The enameled wire for wireless charging coil with inner magnetic nano ferrite material layer as claimed in claim 1, wherein Fe in the middle conductive layeraCobBcIn a doped silver-copper alloy, the FeaCobBcThe mass fraction of doping is 25% -30%.
9. The enameled wire for wireless charging coil with inner magnetic nano ferrite material layer as claimed in claim 8, wherein the Fe is in the range of FeaCobBcThe preparation method of the doped silver-copper alloy comprises the step of adopting a high vacuum sputtering platform to sputter the FeaCobBcThe radio frequency magnetron co-sputtering is carried out on a silver-copper alloy sheet, a glass sheet is used as a substrate, the target base distance is 120 mm-150 mm, and the target base distance is 7.5 × 10-5～8×10-5Sputtering was performed under vacuum of (1).
10. The preparation method of the wireless charging coil enameled wire with the inner magnetic nano ferrite material layer as claimed in claim 1, is characterized in that the method comprises the following steps:
1) immersing the magnetic nano ferrite material in the weight ratio in a dimethylformamide solution with the concentration of 20 mM-35 mM to form a magnetic nano ferrite material organic solution, and carrying out reaction at the temperature of 85-100 ℃ and the concentration of 30cm2/min～40cm2N of flow rate/min2Drying and curing in the atmosphere to form a solid magnetic nano ferrite material cylindrical core material with the diameter of 0.05-0.30 mm;
2) mixing said weight ratio of FeaCobBcMelting the doped silver-copper alloy material at 60-80 ℃, sleeving the solid magnetic nano ferrite material cylindrical core material obtained in the step 1) on a first shell model with 15-20-degree interval circular arcs, and immersing the solid magnetic nano ferrite material cylindrical core material in the molten FeaCobBcDoped silver-copper alloy material at 45-65 deg.c and 30cm2/min～40cm2N of flow rate/min2Drying and curing in the atmosphere to obtain a prefabricated body;
3) melting the insulating high molecular polymer with the weight ratio at 90-110 ℃, sleeving the solidified prefabricated body with the first shell model on a second shell model with 15-20-degree interval circular arcs, immersing the prefabricated body in the molten insulating high molecular polymer at 55-75 ℃ for 30cm2/min～40cm2N of flow rate/min2Drying and curing in the atmosphere; the outer diameter of the first shell model is equal to the inner diameter of the second shell model, so that an enameled wire precursor is obtained;
4) immersing the enameled wire precursor which is obtained in the step 3) and is provided with the first shell model and the second shell model after drying and curing into polybutylene terephthalate solution with the concentration of 75-85%, and after thermocuring for 45 min-1.5 h at 65-90 ℃, sequentially taking off the second shell model and the first shell model to obtain the wireless charging coil enameled wire with the inner layer of the magnetic nano ferrite material;
preferably, the first shell model and the second shell model in step 3) are distributed at intervals and staggered in arrangement.
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