KR100784459B1 - Aluminum Anode Oxidization Electric Wire And Manufacturing Method Thereof - Google Patents

Abstract

The aluminum anodized wire of the present invention comprises a core material composed of any one of aluminum, aluminum alloy, aluminum coated steel wire or aluminum coated copper wire, and sulfuric acid (H ₂ SO to which 0.5-2 g / l sodium sulfate (Na ₂ SO ₄ ) is added). ₄ ) Anodized layer formed by anodizing in aqueous solution, molybdenum disulfide (MoS ₂ ) filled in the lower part of the plurality of micropores formed in the anodized layer, and the plurality of micropores respectively It includes a hydrate to seal the. In the present invention, by adding sodium sulfate as an additive during anodizing and impregnating molybdenum disulfide (MoS ₂ ) in the micropores of the anodized layer, flexibility, insulation, mechanical properties, and corrosion resistance are improved. Applications include micromachines, biotechnology, medicine, space, aviation, nuclear power, and more.

Description

Aluminum Anode Oxidization Electric Wire And Manufacturing Method Thereof}

1 to 3 is a schematic diagram showing the configuration of the aluminum anodized wire according to an embodiment of the present invention,

4 and 5 are cross-sectional views showing in detail the film structure of the aluminum anodized wire according to the present invention,

6 is a photograph comparing the existing anodized layer and the anodized layer according to this embodiment.

  ♠ Explanation of symbols on the main parts of the drawing ♠

11 aluminum 12 anodized layer

13: protective film layer

The present invention relates to an aluminum anodized wire, and more particularly to an aluminum anodized wire with improved flexibility, insulation, mechanical properties and corrosion resistance, and a manufacturing method thereof.

Magnet wire (MAGNET WIRE) is also called a winding, it is used as a major material such as electrical equipment, communication equipment and electronic devices. Specifically, it is widely used in electronic wires, from fine coils and moving coils of micrometers to large transformer coils for power and field coils of large turbine generators.

The main products are polyamide (window line), polyamide (window wire), polyamide (foam) wire, foam dehyde wire, epoxy wire, solder enamel wire, lubricated enamel wire, etc. It is common to classify heat resistant ground winding wire, mica winding, glass winding, and other ceramic wires and RITZ wires. Conductors of these magnet wires include copper wires and aluminum wires. However, in the past, there have been cases where anodized anodized windings made of aluminum have a diameter of 0.3 mmφ or more in the past, but commercialization is poor due to their flexibility, electrical resistance, and manufacturing cost.

Aluminum has many advantages including light weight, excellent workability, corrosion resistance, conductivity and thermal conductivity, low thermal neutron absorption, and anodized film has various advantages including heat dissipation, insulation, adhesion to aluminum and hardness. . Therefore, the aluminum anodized wire combined with these advantages has been utilized for more than 40 years as a winding because there are many excellent properties that the aforementioned insulation material for winding cannot have.

However, since aluminum anodized wire is a ceramic material whose surface is composed of an Al ₂ O ₃ layer, harmful cracking occurs even by a very small deformation caused by mechanical or heat. In addition, since cracking causes insulation deterioration and mechanical strength, the diameter and shape are limited, and the manufacturing speed is also limited. Therefore, the present invention is not currently available on the market except for nuclear reactor-related special medical and therapeutic equipment members. In place of the aluminum anodized wire, many types of enameled wires and transverse windings using a copper wire or an aluminum wire as a core are used.

However, since the field using the winding requires miniaturization, light weight, high precision, and high capacity, the necessity of improving the function by improving the problems (flexibility, insulation, mechanical properties and corrosion resistance, etc.) of the conventional aluminum anodized wire is required. It is more necessary.

Therefore, the present invention has been made to solve the problems of the prior art as described above, by improving the flexibility, insulation, mechanical properties and corrosion resistance, high-tech, nanotech, micromachine, bio, medical, space, aviation, nuclear An object of the present invention is to provide anodized aluminum wire and a method for manufacturing the same, which can be used in various fields.

The present invention for achieving the above object, the core material composed of any one of aluminum, aluminum alloy, aluminum coated steel wire or aluminum coated copper wire, an anodized layer formed on the surface of the core material, and a plurality of micropores formed in the lower portion of the anodized layer Each filled with molybdenum disulfide (MoS ₂ ), and a hydrate that is respectively filled on top of the plurality of micropores to seal the plurality of micropores.

In addition, the present invention is a positive electrode in the aqueous solution of sulfuric acid (H ₂ SO ₄ ) to which 0.5-2 g / l sodium sulfate (Na ₂ SO ₄ ) is added to the core material composed of any one of aluminum, aluminum alloy, aluminum coated steel wire or aluminum coated copper wire Oxidizing to form an anodized layer and electrolyzing a core material on which the anodized layer is formed in an aqueous solution of ammonium tetrathiomolybdate ammonium ((NH ₄ ) ₂ MoS ₄ ) dissolved in a lower portion of the plurality of micropores formed in the anodized layer. Filling molybdenum disulfide (MoS ₂ ), respectively, and filling the hydrate in the upper portion of the plurality of micropores by depositing the core material in hot water to seal the plurality of micropores.

Table 1 compares the advantages and disadvantages of the general enameled wire made of copper (Cu) and aluminum (Al) and the existing aluminum anodized wire (Alumite wire).

As can be seen in Table 1, the conventional aluminum anodized wire has a disadvantage in that its functionality is inferior in comparison to the general enameled wire in flexibility, insulation, and the like.

The inventors of this invention have studied for many years to improve the flexibility of aluminum anodized wire. In other words, in order to improve the flexibility of aluminum anodized wire, the bath property of the electrolytic bath (sulfuric acid bath, chromic acid bath, fish bath or mixed acid bath) is examined, and the condition factors at the time of electrolysis (current density, voltage and waveform) are examined. In addition, the concentration and additives were reviewed. Furthermore, the functional materials to be impregnated into the micropores of the anodized layer treated with anodization were examined in detail.

As a result, we confirmed a new fact that overturned the conventional description in the relationship between the processing crack and flexibility occurring in the anodized layer. In addition, it was confirmed that due to this new fact, the flexibility, insulation and corrosion resistance of the aluminum anodized wire were improved. That is, in the past, it has been judged that when the number of cracks in the surface coating is large, the flexibility, insulation and corrosion resistance are poor, but it is confirmed that the size and shape of the cracks influence the characteristics rather than the number of cracks.

As such, the inventors of the present invention have succeeded in imparting excellent functions unimaginable in the existing aluminum anodized wire in order to improve the problems of the existing aluminum anodized wire. The function imparted here is to improve the flexibility of the film, to improve the lubricity of the film, to improve the corrosion resistance of the film and the like.

Comparing the function of the aluminum anodized wire (Alumite wire here) and the existing aluminum anodized wire (existing Alumite wire) developed in the present invention is shown in Table 2.

As can be seen in Table 2, it can be seen that the aluminum anodized wire of the present invention is significantly improved in flexibility, insulation, corrosion resistance and workability compared to the conventional aluminum anodized wire.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the aluminum anodized wire and a method of manufacturing the same according to the present invention will be described in detail.

1 to 3 is a schematic diagram showing the configuration of the aluminum anodized wire according to an embodiment of the present invention. As shown in Figures 1 to 3, the aluminum anodized wire of this embodiment is largely composed of a core material, anodized film layer and a protective film layer. Here, the protective coating layer is effective to prevent scratches or cracks, but may be omitted.

As the conductive member, as shown in FIG. 1, as shown in FIG. 1, aluminum (11) in which the film is grown by adding sulfuric acid or various metal salts and organics is used, or preferably, in order to improve the strength of the aluminum anodized wire. Likewise, an aluminum clad steel wire composed of steel 24 and aluminum 21 may be used, or an aluminum clad copper wire composed of copper 34 and aluminum 31 may be used as shown in FIG. 3 to improve conductivity. have. As the core material, an aluminum coated steel wire, which is sintered from aluminum powder on carbon steel and cold to a predetermined size, may be used, and an aluminum coated copper wire which is cold to a predetermined size by wrapping aluminum around the copper with a predetermined size.

1 to 3, reference numerals 12, 22, and 32 denote anodization layers having excellent flexibility, insulation, corrosion resistance, and lubricity, and 13, 23, and 33 represent post-treated coated protective coating layers to improve workability. .

In forming the anodized film layer, in the case of the composite wire composed of steel 24 or copper 34 as shown in FIGS. 2 and 3, only aluminum 21 and 31 of the outer circumference are anodized to obtain the desired insulation. It is desirable to process. However, it is also possible to anodize to the outermost surface of the central steel 24 or copper 34 to form a thick anodized layer that can withstand the breakdown voltage of ultra-high pressure.

4 and 5 are cross-sectional views showing in detail the film structure of the aluminum anodized wire according to the present invention, Figure 6 is a photograph comparing the conventional anodized film layer and the anodized film layer according to this embodiment.

As shown in Figs. 4 and 5, the aluminum anodized wire according to this embodiment includes aluminum (41, 51), which is a core material, anodized layers (42, 52) formed on the surfaces of aluminum (41, 51), Molybdenum disulfides (44, 54; MoS ₂ ) filled at the lower ends of the micropores (43, 53) of the anodization layers (42, 52), and the micropores (43, 53) of the anodization layers (42, 52) It is composed of hydrates 45 and 55 filled at the top to seal micropores. However, this embodiment may further include a protective film layer 56 covering the upper surface of the anodized film layer 52 as shown in FIG.

The anodization layers 42 and 52 of this embodiment have a different form from the anodization layer formed by the conventional general anodization process. That is, as shown in FIG. 6, the conventional anodized layer has a small number of cracks while having a deep depth (FIG. 6 (a)), but the anodized layers 42 and 52 of this embodiment are cracked compared to the conventional one. While the number was large, the depth was low (Fig. 6 (b)). That is, in this embodiment, in order to have the anodization layers 42 and 52 as described above, sodium sulfate (Na ₂ SO ₄ ), which has not been previously considered in the anodization treatment, is added as an additive. Thus, by adding sodium sulfate (Na ₂ SO ₄ ) to anodize, the flexibility, lubricity and corrosion resistance of the anodized film layer were greatly improved compared to the conventional one.

In this embodiment, the molybdenum disulfide (44, 54; MoS ₂ ) is filled in the lower end of the micropores (43, 53) of the anodization layer (42, 52), such molybdenum disulfide (MoS ₂ ) has excellent lubricating characteristics Have Therefore, the aluminum anodized wire of this embodiment is not only improved lubricity due to the molybdenum disulfide (MoS ₂ ) is filled, the flexibility and insulation is further improved.

In addition, the protective film layer 56 of this embodiment serves to prevent surface scratches generated during friction between the wires or cracks generated when the wires are wound around the coil, and further improves lubricity, corrosion resistance and insulation. do.

Hereinafter will be described in detail for the manufacturing method of the aluminum anodized wire according to the present invention configured as described above.

Anodizing the aluminum material may include a hydroxyl method (oxalic acid: H ₂ C ₂ O ₄ ), a sulfuric acid method (H ₂ SO ₄ ), a chromic acid method (CrO ₃ ), and a mixed acid method. It was. That is, in a sulfuric acid aqueous solution, an aluminum wire is used as a positive electrode (+) and a charged Al or Pb plate is used as a negative electrode (−) to conduct a DC half-wave current. Then, O ₂ ^- and Al ⁺ dissociated in H ₂ O are combined on the surface of the aluminum wire to form a barrier layer, which is an anodized layer, and when energized continuously, an anodized layer grows from the barrier layer to form a porous insulating coating layer. .

Specifically, an aqueous solution of sulfuric acid (H ₂ SO ₄ , 15-20%) is used as an electrolyte, but sodium sulfate (Na ₂ SO ₄ ) is added as an additive of 0.5-2 g / l to improve the flexibility of the anodized layer, and the film is coated. The temperature of the electrolytic solution was applied at a temperature of 5 to 25 ° C. and a direct current or alternating current at 2 to 15 A / dm ² to obtain an anodized layer having a thickness of 5 to 10 μm. At this time, the addition of 0.5 ~ 2g / l of sodium sulfate (Na ₂ SO ₄ ) is because the range is the most effective in improving the flexibility of the anodized film layer.

Then, anodized aluminum wire was secondary electrolyzed in an aqueous solution of tetrathiomolybdate ammonium ((NH ₄ ) ₂ MoS ₄ ) to precipitate molybdenum disulfide (MoS ₂ ) in the micropores of the anodized layer. Impregnation from base to bottom part (see Formula 1)

Then, the aluminum wire was immersed in distilled water of 80-90 ° C., hot water containing nickel sulphate or sodium silicate for several minutes, and then placed on top of the micropores of the anodized layer, that is, the top of the filled molybdenum disulfide (MoS ₂ ). The micropores are sealed by filling with a hydrate combining H ⁺ ions and OH ^- ions.

And like a conventional copper or aluminum wire to form a protective coating layer coated with a thickness of several ㎛ ~ several 10㎛ by spraying or depositing resin, silicone or oils to prevent scratches or cracks.

In the present invention, by adding sodium sulfate as an additive during anodizing, the number of cracks in the coating layer is higher than that of the conventional layer, but the depth of the coating layer is not so deep that flexibility, insulation, mechanical properties and corrosion resistance are improved. It can be used in various fields such as, biotechnology, medical, space, aviation and nuclear power.

In addition, according to the present invention, by using aluminum, aluminum alloy, aluminum coated steel wire or aluminum coated copper wire as a core material, it is possible to manufacture aluminum anodized wire suitable for the purpose of light weight, high strength, and high conductivity (conductivity).

In addition, the present invention is an electrochemical impregnation of molybdenum disulfide (MoS ₂ ) in the micropores of the anodized film layer to improve the electrical insulation and corrosion resistance, including stress suppression, crack generation suppression, lubrication performance in the coating layer There is.

In addition, the present invention improves electrical insulation and corrosion resistance because it is deposited in hot water for several minutes to fill and seal the micropores of the anodized layer with hydrate.

In addition, the present invention by coating the surface with a protective coating layer having a lubricity to prevent scratches or cracks during the setting work of the coil and improve the workability.

The technical details of the aluminum anodized wire of the present invention have been described with reference to the accompanying drawings, but the exemplary embodiments of the present invention are described by way of example and are not intended to limit the present invention.

It is also apparent that any person skilled in the art can make various modifications and imitations within the scope of the appended claims without departing from the scope of the technical idea of the present invention.

Claims (4)

delete Core material composed of any one of aluminum, aluminum alloy, aluminum coated steel wire or aluminum coated copper wire, Anodized film layer formed on the surface of the core material, Molybdenum disulfide (MoS ₂ ) and respectively filled in the lower portion of the plurality of micropores formed in the anodized film layer, A hydrate filling each of the plurality of micropores to seal the plurality of micropores, and Aluminum anodization wire, characterized in that it comprises a protective film layer coated on the upper surface of the anodized film layer. Anodizing layer by anodizing core material composed of aluminum, aluminum alloy, aluminum coated steel wire or aluminum coated copper wire in an aqueous solution of sulfuric acid (H ₂ SO ₄ ) to which 0.5 ~ 2g / l sodium sulfate (Na ₂ SO ₄ ) is added Forming a, The core material on which the anodized layer was formed was electrolyzed in an aqueous solution of tetrathiomolybdate ammonium ((NH ₄ ) ₂ MoS ₄ ) to fill molybdenum disulfide (MoS ₂ ) at the bottom of the plurality of micropores formed in the anodized layer. Steps, and And dipping the core material into hot water to fill a hydrate on top of the plurality of micropores to seal the plurality of micropores. The method according to claim 3, And after the sealing of the plurality of micropores, forming a protective film layer by coating an upper surface of the anodized film layer with resin, silicon, or oil.

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