Method for preparing special-shaped flat copper wire CuO ceramic layer based on three-synergistic-effect anodic oxidation

Abstract

The invention discloses a method for preparing a special-shaped flat copper wire CuO ceramic layer based on three-synergistic-effect anodic oxidation, which comprises the following steps: step 1, grinding and polishing a flat copper wire and removing an oxidation film on the surface layer, pouring absolute ethyl alcohol into the flat copper wire to completely immerse the treated copper wire, carrying out ultrasonic cleaning and deionized water chemical washing, and drying to obtain a material; 2, NaOH is added into deionized water under magneton stirring, PVA and NaKC4H4O6 are weighed and added into the solution, and an anodic oxidation electrolyte is obtained; 3, the material obtained in the step 1 is subjected to water bath heating in the anodic oxidation electrolyte prepared in the step 2 with graphite as double cathodes, and oxidation is conducted; step 4, cleaning the material oxidized in the step 3 in deionized water; step 5, drying the obtained material in a convection oven to obtain a CuO ceramic layer; the preparation period is short, film-substrate combination is good, and the method is suitable for special-shaped parts and can be used in the fields of wind power, motors, submarine cables and the like.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of motor copper wire surface coating, in particular to a method for preparing a special-shaped flat copper wire CuO ceramic layer based on three synergistic effects of anodic oxidation. BACKGROUND

[0002] In the field of motor copper wire surface coating, the wind turbine conductor is a core transmission component, and its operating environment requires high temperature resistance. Currently, wind turbine conductors generally need to withstand high temperatures of 500℃ to ensure the stability and safety of the equipment during long-term high-intensity operation. However, traditional organic coating materials are limited by their molecular structure and thermal stability, and tend to soften, decompose or fall off under high temperature conditions, which cannot meet the long-term high-temperature use requirements of wind turbine conductors, becoming a key bottleneck restricting the performance improvement and life extension of wind power equipment. The conductor commonly used in wind turbine conductors is bare copper wire. Although copper has excellent electrical conductivity, as the current frequency increases, it inevitably produces a skin effect, that is, most of the current is concentrated near the surface of the conductor for transmission, which significantly increases the current transmission loss and reduces the electrical conductivity of the conductor. To solve the problem of skin effect of bare copper wire and meet the high temperature resistance requirement at the same time, modifying the surface of the copper wire and preparing a high-performance protective coating become key technical directions. CuO is a p-type semiconductor material with a narrow band gap (1.2-1.5 eV), which has good thermal stability and photochemical stability, as well as high-temperature superconductivity and high electrochemical activity. Its high-temperature resistance can easily meet the 500℃ use requirement of wind turbine conductors. If a CuO ceramic layer can be grown in situ on the surface of the copper wire, it can not only achieve mutual insulation between multiple wires, but also effectively increase the surface area of the conductor, fundamentally reduce the skin effect of copper, and solve the problem of insufficient high-temperature resistance of traditional organic coatings. Chinese patent "Preparation method of nano copper oxide sheet" (application number: CN202510106501.6, authorization number: CN119569101B, publication date: 2025-05-16) discloses a preparation method of nano copper oxide sheet. The method first prepares a copper precursor solution containing a surfactant and an alkaline aqueous solution under magnetic stirring, then converts them into corresponding micro-nano aerosols by a high-frequency electronic shock device, then performs gas phase limited micro-zone mixing pre-reaction on the two aerosols to obtain a copper-alkali mixed solution, then transfers it to a polytetrafluoroethylene reaction kettle for hydrothermal reaction to obtain a copper compound nanoparticle solution, and finally performs solid-liquid separation, washing, drying and calcination to obtain a nano copper oxide sheet. The nano copper oxide sheet prepared by this method cannot be applied to the coating field and cannot form effective bonding with the substrate. SUMMARY

[0003] In view of the problem of skin effect of flat copper wire of a wind driven generator and the problem of simultaneously meeting the high temperature resistance requirement, the application provides a method for preparing a CuO ceramic layer of a special-shaped flat copper wire based on three synergistic effects of anodic oxidation. The method can prepare the CuO ceramic layer with uniform distribution, good bonding force and relative compactness by using a double cathode anodic oxidation technology, and has the advantages of good economy, simple equipment structure and low skill requirement for experiment and operation personnel, and does not need complex production process and high equipment investment, and can realize large-scale industrial production, and provides a feasible technical scheme for high temperature resistance modification and electric conductivity optimization of the wire of the wind driven generator.

[0004] In order to achieve the above-mentioned purpose, the application adopts the following technical scheme: A method for preparing a CuO ceramic layer of a special-shaped flat copper wire based on three synergistic effects of anodic oxidation is implemented according to the following steps: Step 1, material pretreatment: grinding and polishing the original flat copper wire special for a motor and removing the oxide film on the surface, pouring anhydrous ethanol to completely immerse the treated copper wire, ultrasonic cleaning, chemical washing with deionized water, and drying to obtain the required material; Step 2, anodic oxidation electrolyte preparation: under the magnetic stirring, adding NaOH into the deionized water, and adding PVA and NaKC4H4O6 into the solution to obtain the anodic oxidation electrolyte; Step 3, anodic oxidation: performing anodic oxidation on the material obtained in step 1 in the anodic oxidation electrolyte prepared in step 2 with graphite as the double cathode and water bath heating; Step 4, chemical washing: after the reaction in step 3 is completed, washing the oxidized material in deionized water; Step 5, drying: drying the material obtained in step 4 in a convection oven to obtain the CuO ceramic layer.

[0005] Further, the magnetic sonicator is continuously stirred in step 2, and the rotating speed is 60 r / min.

[0006] Further, the mass ratio of NaOH, PVA, NaKC4H4O6 and deionized water in the anodic oxidation electrolyte in step 2 is 19.5-20.5:2.9-3.1:0.95-1.05:500.

[0007] Further, the area ratio of the anode to the cathode is 1.5:1, and the current density is 2-5 mA / cm 2 .

[0008] Further, the anodic oxidation time in step 3 is 0.5 h-1.5 h, and the water bath heating temperature is 70 DEG C.

[0009] Further, the temperature of the convection oven in step 5 is 60 DEG C, and the drying time is 5 min.

[0010] Compared with the prior art, the present application has the following beneficial effects: 1. Double cathode electric field homogenization, energy saving and economic efficiency: Adopting double cathode anodization process, matching low current density, short oxidation cycle, greatly reducing power consumption; Double cathode can provide homogeneous electric field, making the plating layer of special-shaped parts uniform; The electrolyte is NaOH, PVA, NaKC4H4O6, etc. Conventional raw materials, no need for complex equipment and post-processing, control cost from energy consumption, raw materials and equipment, solve the problem of insufficient energy saving of existing technology.

[0011] 2. In-situ growth, firm film-base combination: PVA generates a transition state complex structure in the electrolyte, forming an extremely thin "transition layer" that can accurately fill the structural difference between copper and CuO, and build an interface bridging structure to enhance the firmness of the film-base combination from the microscopic level. The CuO ceramic layer grows in-situ on the surface of the flat copper wire, forming a "covering + embedding" three-dimensional combination structure with the copper wire matrix, and the ceramic layer is uniform microparticles, which greatly increases the contact area with the matrix, further improves the adhesion, effectively avoids the problem of easy peeling of traditional coatings; At the same time, this in-situ growth process can directly complete the conversion of Cu to CuO, without additional post-processing steps, simplifying the preparation process.

[0012] 3. Adapt to special-shaped flat copper wire, wide application range: The process is optimized for special-shaped flat copper wire, which can uniformly generate CuO layer on the special-shaped surface (non-circular cross section, corners) of the special-shaped flat copper wire, breaking through the limitations of traditional technology, and can be used in wind power, motor, submarine cable and other fields. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 is a process flow chart of a method for preparing a CuO ceramic layer of a special-shaped flat copper wire based on three synergistic effects anodization of the present application; Figure 2 is a calculation simulation diagram of complex stabilization and interface bridging theory used in the present application; Figure 3 is a front and side macroscopic photo of embodiments 1-5 of the present application; Figure 4 is an X-ray diffraction pattern of embodiments 1-5 of the present application; Figure 5 is a scanning electron microscope image of embodiment 1 of the present application; Figure 6 is a scanning electron microscope image of embodiment 2 of the present application; Figure 7 is a scanning electron microscope image of embodiment 3 of the present application; Figure 8 is a scanning electron microscope image of embodiment 4 of the present application; Figure 9 is a scanning electron microscope image of embodiment 5 of the present application; Figure 10 is a laser confocal image of Example 5 of the present application; Figure 11 is a micro scratch test image of Example 5 of the present application. DETAILED DESCRIPTION

[0014] The present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0015] As shown in Figure 1 , the present application proposes a method for preparing a profiled flat copper wire CuO ceramic layer based on three synergistic effects of anodic oxidation, which is specifically implemented according to the following steps: Step 1, material pretreatment: polish and polish the original flat copper wire with length, width and height of 130*5*2mm (actual effective length of 100mm) and remove the oxide film on the surface, pour anhydrous ethanol to completely immerse the treated copper wire, ultrasonic cleaning, chemical washing with deionized water, and then drying to obtain the required material; Step 2, anodizing electrolyte preparation: under the condition of continuous stirring of magnetic son, speed of 60r / min, NaOH is added to deionized water, and PVA and NaKC4H4O6 are added to the solution to obtain an anodizing electrolyte; the mass ratio of NaOH, PVA, NaKC4H4O6 and deionized water in the electrolyte raw material is 19.5~20.5:2.9~3.1:0.95~1.05:500, wherein NaOH is 39~41g, PVA is 5.8~6.2g, and NaKC4H4O6 is 1.9~2.1g per liter of deionized water; Step 3, anodizing: the material obtained in step 1 is oxidized in the anodizing electrolyte prepared in step 2 with graphite as a double cathode, water bath heating; the area ratio of anode to cathode is 1.5:1 during anodizing, the current density is 2~5mA / cm 2 , the oxidation time is 0.5h-1.5h, and the water bath heating temperature is 70℃; Step 4, chemical washing: after the reaction in step 3 is completed, the oxidized material is thoroughly washed in deionized water; Step 5, drying: the material obtained in step 4 is dried in a convection oven at 60℃ for 5min, and a CuO ceramic layer is obtained.

[0016] The calculation simulation diagram of the complex stabilization and interface bridging theory used in the present application is shown in Figure 2 , which shows the binding energy changes when NaKC4H4O6, PVA respectively acts on Cu 2+ , and both of them act on Cu 2+ . By comparing the energy values, it can be seen that NaKC4H4O6, PVA respectively acts on Cu 2+ , and both of them act on Cu2+ The energy is low in combination, which shows strong combination tendency, and reflects that there is significant interaction between NaKC4H4O6, PVA and Cu 2+ , which provides theoretical support for the reaction system from the energy angle. Embodiment

[0017] Step 1, material pretreatment: the original flat copper wire with length, width and height of 130*5*2mm (actual effective length of 100mm) for motor is polished and the oxide film on the surface is removed, the treated copper wire is completely immersed into anhydrous ethanol, ultrasonic cleaning is carried out for 1min, chemical washing is carried out after deionized water, and the required material is obtained after drying; Step 2, anodizing electrolyte preparation: under the condition of continuous stirring of magnetic son, NaOH is added into 1L deionized water, and PVA and NaKC4H4O6 are added into the solution, and the anodizing electrolyte is obtained; wherein, the NaOH in deionized water is 39g per liter, the PVA is 5.8g per liter, and the NaKC4H4O6 is 1.9g per liter; Step 3, anodizing: the material obtained in step 1 is oxidized in the electrolyte prepared in step 2 with graphite as double cathode, water bath heating, anodizing, the area ratio of anode and cathode is 1.5:1, the current density is 2mA / cm 2 , the oxidation time is 1h, and the water bath heating temperature is 70℃; Step 4, washing: after the reaction in step 3 is completed, the oxidized material is washed thoroughly in deionized water; Step 5, drying: the material obtained in step 4 is dried in a 60℃ convection oven for 5min.

[0018] Figure 5 is the scanning electron microscope image of embodiment 1 of the application, from Figure 5 (a) it can be seen that, under the view angle of 20,000 times, the CuO particles present a continuous particle accumulation morphology, the particles on the surface of the flat copper wire are connected through aggregation, and a penetrating pore network is formed; the uniform effect of the electric field of the double cathode effectively solves the problem of inconsistent particle density on the edge and corner and the thin problem of the plane. Figure 5 (b) it can be seen that, under the view angle of 50,000 times, the hole is a "gap hole" formed by particle accumulation after magnification, the size of the pore matches that of the particle, the structure has good connectivity, the particle grows vertically along the substrate with good directionality, and there is no irregular agglomerate. Embodiment

[0019] Step 1, material pretreatment: the original flat copper wire with length, width and height of 130*5*2mm (actual effective length of 100mm) is polished and the oxide film on the surface is removed, the treated copper wire is completely immersed into anhydrous ethanol, ultrasonic cleaning is carried out for 1min, chemical washing is carried out after deionized water, and the required material is obtained after drying; Step 2, anodic oxidation electrolyte configuration: under the condition of continuous stirring of the magnetic sub, the rotation speed is 60 r / min, NaOH is added into 1L deionized water, and PVA and NaKC4H4O6 are measured and added into the solution to obtain an anodic oxidation electrolyte; wherein, the NaOH in each liter of deionized water is 40g, the PVA is 6g, and the NaKC4H4O6 is 2g; Step 3, anodic oxidation: the material obtained in step 1 is oxidized in the electrolyte prepared in step 2 with graphite as a double cathode, water bath heating; the area ratio of anode to cathode is 1.5:1 during anodic oxidation, the current density is 3.5mA / cm 2 , the oxidation time is 0.5h, and the water bath heating temperature is 70℃; Step 4, washing: after the reaction in step 3 is completed, the oxidized material is thoroughly washed in deionized water; Step 5, drying: the material obtained in step 4 is dried in a 60℃ convection oven for 5min.

[0020] Figure 6 is the scanning electron microscope image of example 2 of the present application, from Figure 6 (a) it can be seen that the CuO particle coverage is high under 20,000 times visual angle, which is accumulated by fine particles, and the coating closely fits the substrate; from Figure 6 (b) it can be seen that the coating surface is rough under 50,000 times visual angle, the pore distribution is uniform, and there is no obvious large-scale crack or peeling, which indicates that the micro-continuity of the coating is good. Example

[0021] Step 1, material pretreatment: the original flat copper wire with length, width and height of 130x5x2mm (actual effective length of 100mm) for motor is polished and polished and the oxide film on the surface is removed, the treated copper wire is completely immersed in anhydrous ethanol, ultrasonic cleaning for 1min, deionized water chemical washing, and then drying to obtain the required material; Step 2, anodic oxidation electrolyte configuration: under the condition of continuous stirring of the magnetic sub, the rotation speed is 60 r / min, NaOH is added into 1L deionized water, and PVA and NaKC4H4O6 are measured and added into the solution to obtain an anodic oxidation electrolyte; wherein, the NaOH in each liter of deionized water is 40g, the PVA is 6g, and the NaKC4H4O6 is 2g; Step 3, anodic oxidation: the material obtained in step 1 is oxidized in the electrolyte prepared in step 2 with graphite as a double cathode, water bath heating; the area ratio of anode to cathode is 1.5:1 during anodic oxidation, the current density is 3.5mA / cm 2 , the oxidation time is 1h, and the water bath heating temperature is 70℃; Step 4, washing: after the reaction in step 3 is completed, the oxidized material is thoroughly washed in deionized water; Step 5, drying: The material obtained in step 4 was dried in a 60°C convection oven for 5 min.

[0022] Figure 7 is a scanning electron microscope image of Example 3 of the present application, in which the three synergistic effects are completely balanced, and the SEM image presents the core characteristics of uniformity, compactness and no defects. From Figure 7 (a) it can be seen that, under a 20,000-fold view, the CuO particles continuously cover the surface without any gaps, and the adjacent particles are closely connected to form a whole continuous ceramic layer; in combination with the film thickness of 17.2-21.4 μm in Table 1, it can be seen that the particle density and the thickness are completely matched, neither too low in thickness due to sparseness nor too high in thickness due to high density. From Figure 7 (b) it can be seen that, under a 50,000-fold view, the nanoparticles are stretched and have strong directivity, and the angle deviation of the vertical substrate is <5°; the gap between the particles is controllable, which not only increases the specific surface area to reduce the skin effect, but also guarantees the compactness.

[0023] Figure 10 is a laser confocal image of Example 3 of the present application. The surface presents a continuous undulating feature without large-area blank or fracture, indicating that the measured surface has good coverage. The distribution of green and blue areas is relatively uniform, without local high convexities or deep valleys, indicating that the surface roughness has low fluctuation. It can also be seen that the CuO ceramic layer is grown in situ on the surface of the copper wire, and the CuO ceramic layer will grow out along the surface and will penetrate into the copper wire substrate. The laser confocal image reflects the good uniformity of the surface morphology and the controllable roughness characteristics of the measured surface.

[0024] Figure 11 depicts the changes of the axial load and the lateral force on the surface of Example 3 with the scratch distance during the micron scratch experiment, as well as the optical morphology of the residual scratch, so as to analyze the bonding force between the coating and the substrate. From the mechanical curve, the axial load linearly increases with the scratch distance, and the lateral force shows an overall upward trend, but there is a significant force value jump at a scratch distance of about 2.6 mm. The "jump point" corresponds to the critical value of the bonding force between the coating and the substrate - at this time, the coating begins to fail due to adhesion, and the friction force increases significantly due to the interface damage. The linear law of the axial load can be used to calculate that the critical load is about 4-5 N. In the scratch morphology graph, the scratch is continuous as a whole and there is no obvious large-scale peeling, indicating that the coating and the substrate are tightly bonded before the critical load. In summary, the critical load of the bonding force between the coating and the substrate is about 4-5 N, indicating that the coating has good interface bonding strength.

[0025] Table 1 is the thickness measurement value and average value of CuO ceramic layer prepared by 1h oxidation time and 3.5mA / cm2 current density in four different positions of Example 3. The film thickness of the four measurement points ranges from 17.198 to 21.428μm, with an average value of 19.846μm, which is within the optimal thickness interval of 17.2~21.4μm in the invention, and the value is consistent with the X-ray diffraction (XRD) result. XRD did not detect Cu substrate peak, indicating that the thickness is sufficient to completely cover the surface of the copper wire and shield the substrate signal.

[0026] Table 1

[0027] Table 2 is the roughness (Ra) measurement value of the surface of the CuO ceramic layer in three different positions of Example 3. The Ra value of the three measurement points is concentrated in 3.293~3.508μm, with an average value of about 3.378μm, and the numerical fluctuation amplitude is only 0.215μm, indicating that the surface roughness uniformity of the ceramic layer is excellent, which verifies the effectiveness of the "uniform electric field effect" of the double cathode. Even on the irregular surface of the flat copper wire, the growth rate of CuO can still be controlled by uniform electric field to avoid local excessive protrusion or depression, and the surface morphology consistency can be ensured. The roughness range belongs to medium-low roughness, which not only meets the functional requirements and avoids the decline of insulation performance caused by excessive roughness, but also retains a certain surface relief, which can increase the specific surface area and provide a structural basis for subsequent reduction of skin effect and improvement of film-substrate adhesion. The uniformity of roughness further verifies the growth stability of CuO particles: the consistency of the values in the table indicates that the "complexing stability effect" of NaKC4H4O6 effectively controls the release rate of Cu2+, and the "interface bridging effect" of PVA guides the directional growth of nanosheets, which together ensure the uniformity of microstructure and ultimately reflect the stability of surface roughness. 2+

[0028] Table 2 Example

[0029] Step 1, material pretreatment: The original flat copper wire with length, width and height of 130x5x2mm (actual effective length of 100mm) for motor is polished and the surface oxide film is removed. The treated copper wire is completely immersed in anhydrous ethanol, ultrasonic cleaned for 1min, and then dried after chemical washing with deionized water to obtain the required material; Step 2, anodizing electrolyte preparation: under the condition of continuous stirring of magnetic sonicator at a speed of 60r / min, NaOH is added to 1L deionized water, and PVA and NaKC4H4O6 are separately taken and added to the solution to obtain the anodizing electrolyte; wherein the NaOH is 41g, the PVA is 6.2g, and the NaKC4H4O6 is 2.1g per liter of deionized water; ​Step 3, anodic oxidation: the material obtained in step 1 is oxidized in the electrolyte prepared in step 2 with graphite as double cathode, water bath heating; the area ratio of anode to cathode is 1.5:1, the current density is 3.5 mA / cm 2 , the oxidation time is 1.5 h, and the water bath heating temperature is 70℃; Step 4, washing: after the reaction in step 3 is completed, the oxidized material is washed thoroughly in deionized water; Step 5, drying: the material obtained in step 4 is dried in a 60℃ convection oven for 5 min.

[0030] Figure 8 is a scanning electron microscope image of embodiment 4 of the present application, from Figure 8 (a) it can be seen that, under a 20,000 times visual angle, the surface CuO layer is formed by a large number of fine particles, and the overall thickness is in the order of hundreds of nanometers; there is a local embedding feature at the interface between the substrate and the modified layer, and part of the modified layer particles fill the micro concave pits on the surface of the substrate; from Figure 8 (b) it can be seen that, under a 50,000 times visual angle, it can be seen that the surface CuO layer is an aggregate of nano-level particles, which tightly covers the textured surface of the substrate, further embodying the interface adhesion. Embodiment

[0031] Step 1, material pretreatment: the original flat copper wire for motor, with length, width and height of 130×5×2mm (actual effective length of 100mm), is polished and polished and the oxide film on the surface is removed, the treated copper wire is completely immersed in anhydrous ethanol, ultrasonic cleaning for 1 min, deionized water chemical washing, and drying to obtain the required material; Step 2, anodic oxidation electrolyte preparation: under the condition of continuous stirring of magnetic sonicator at a speed of 60 r / min, NaOH is added to 1L deionized water, and PVA and NaKC4H4O6 are separately taken and added to the solution to obtain an anodic oxidation electrolyte; wherein, the NaOH in deionized water is 40g per liter, the PVA is 6g, and the NaKC4H4O6 is 2g; Step 3, anodic oxidation: the material obtained in step 1 is oxidized in the electrolyte prepared in step 2 with graphite as double cathode, water bath heating; the area ratio of anode to cathode is 1.5:1, the current density is 5 mA / cm 2 , the oxidation time is 1 h, and the water bath heating temperature is 70℃; Step 4, washing: after the reaction in step 3 is completed, the oxidized material is washed thoroughly in deionized water; Step 5, drying: the material obtained in step 4 is dried in a 60℃ convection oven for 5 min.

[0032] Figure 9 is a scanning electron microscope image of embodiment 5 of the present application, fromFigure 9 (a) It can be seen that, under a magnification of 20,000x, the surface CuO layer exhibits a continuous particle-stacking coating with no obvious large-scale defects. The coating thickness is uniform, and the coating tightly covers the substrate surface without obvious peeling or voids, indicating good interfacial adhesion. Figure 9 (b) It can be seen that at a magnification of 50,000, there are tiny interconnected pores between the particles. These pores not only preserve the air permeability of the coating, but also maintain the overall continuity.

[0033] Macroscopic observations were performed on the front and side views of the CuO ceramic layers prepared in Examples 1-5 of this invention, as shown below. Figure 3 As shown in the figure, the CuO ceramic layer can completely cover the surface of the flat copper wire (including irregular parts such as corners), and the macroscopic appearance is consistent. This proves that the uniform effect of the dual cathode electric field is effectively adapted to irregular parts, breaking through the limitations of traditional processes on regular shaped wires.

[0034] X-ray diffraction (XRD) analysis was performed on the CuO ceramic layers prepared in Examples 1-5 of this invention, as follows: Figure 4 As shown in the figure, characteristic peaks of CuO appeared on the surface of all materials, corresponding to their standard card (JCPDS: 89-5898). Among them, the CuO ceramic layer prepared in Example 3 showed the most obvious peak and the best effect. Furthermore, the strong matching of the RD peaks proves that the main component of the ceramic layer grown on the copper wire surface is CuO, without other impurity phases. Therefore, it can be concluded that the CuO ceramic layer was successfully prepared by the method of this invention, with precise synergistic effect of the electrolyte components and no introduction of additional impurities.

[0035] While specific embodiments of the present invention have been described above, those skilled in the art should understand that these are merely illustrative examples. Other experimentally proven modifications not mentioned in the specification, such as changes to the cathode material (stainless steel, titanium, etc.) and cathode arrangement (single cathode, ring cathode, etc.), are also within the scope of this invention. The scope of protection of this invention is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the invention, and all such changes and modifications fall within the scope of protection of this invention.

Claims

1. A method for preparing a CuO ceramic layer of irregularly shaped flat copper wire based on anodic oxidation with a three-synergistic effect, characterized in that, The specific steps are as follows: Step 1, Material Pretreatment: Polish the original flat copper wire for motors and remove the oxide film on the surface. Pour anhydrous ethanol to completely immerse the treated copper wire, ultrasonically clean it, chemically wash it with deionized water, and then dry it to obtain the required material. Step 2, Preparation of anodic oxidation electrolyte: Under magnetic stirring, NaOH is added to deionized water, and PVA and NaKC4H4O6 are separately measured and added to the solution to obtain the anodic oxidation electrolyte; Step 3, Anodizing: The material obtained in Step 1 is anodized in the anodizing electrolyte prepared in Step 2 with graphite as the dual cathode and heated in a water bath. Step 4, Chemical Washing: After the reaction in Step 3 is completed, the oxidized material is washed in deionized water; Step 5, Drying: Dry the material obtained in step 4 in a convection oven to obtain a CuO ceramic layer.

2. The method for preparing irregularly shaped flat copper wire CuO ceramic layers based on three-synergistic effect anodizing according to claim 1, characterized in that, In step 2, the magnetic stirrer is used to stir continuously at a speed of 60 r / min.

3. The method for preparing a CuO ceramic layer of irregularly shaped flat copper wire based on anodic oxidation according to claim 1, characterized in that, In step 2, the mass ratio of NaOH, PVA, NaKC4H4O6 to deionized water in the anodic oxidation electrolyte is 19.5~20.5:2.9~3.1:0.95~1.05:

500.

4. The method for preparing irregularly shaped flat copper wire CuO ceramic layers based on three-synergistic effect anodizing according to claim 1, characterized in that, In step 3, the anode-cathode area ratio during anodic oxidation is 1.5:1, and the current density is 2~5 mA / cm². 2 .

5. The method for preparing a CuO ceramic layer of irregularly shaped flat copper wire based on anodic oxidation according to claim 1, characterized in that, In step 3, the anodizing time is 0.5h~1.5h, and the water bath heating temperature is 70℃.

6. The method for preparing a CuO ceramic layer of irregularly shaped flat copper wire based on anodic oxidation with a three-synergistic effect according to claim 1, characterized in that, In step 5, the temperature of the convection oven is 60℃, and the drying time is 5 minutes.

Images