KR19990084265A - Material coating method for brazing on aluminum products - Google Patents

Abstract

As a method of applying a material for brazing to a product that requires brazing made of Al, the Al product is moved at a constant speed from one direction to the other. The moving Al product passes through the electrostatic coating device, and the powder mixed with the braze powder and the flux powder is sprayed through the sprayer installed in the electrostatic coating device. The Al product passes between the electrode plates of the electrostatic coating device. At this time, the powder injected by the electrostatic force is adsorbed onto the Al product to form a mixed powder layer. The mixed powder may further include a binder powder, or one or both of the brazing material powder and the flux powder constituting the mixed powder may be coated with the binder powder in advance. In the case of using a binder powder or a powder coated with a binder, a baking process is further performed on the Al product. While passing through the baking apparatus, the binder component applied to the surface of the Al product is dissolved and filled between the solder powder and the binder powder, and after a certain time, it is dried to form a binder layer.

Description

Material coating method for brazing on aluminum products

The present invention relates to a method for applying a mixed powder such as a braze material powder or a flux powder for brazing to an Al product manufactured using an Al material such as Al or Al alloy sheet, in particular a heat exchanger such as a header or an extruded tube The present invention relates to a method of applying a brazing powder to a component and an assembly such as a condenser or an evaporator and then applying a flux of powder. In addition, the present invention relates to an aluminum or aluminum alloy brazing sheet used in the manufacture of various heat exchangers, and in particular, a mixed powder such as flux on one or both sides of an Al sheet using an electrostatic coating apparatus, followed by baking ( The present invention relates to a method for producing Al or Al alloy brazing sheet and Al alloy brazing material which are baked and baked.

Various methods have been proposed as a method of manufacturing an Al heat exchanger, particularly an Al heat exchanger for automobiles. One of them is Al clad sheet which is coated with soldering material on Al sheet. In this case, Al sheet is used as base metal to cover soldering material on one or both sides of Al sheet. clad. As an Al sheet as a base material, 3000 and 6000 series aluminum are used typically, and as a south solder or cladding material, 4000 series aluminum which has Al-Si alloy as a main component is used. Recently, a south solder material mainly containing Zn or Zn-Al has also been developed.

An Al heat exchanger is obtained by fabricating parts for heat exchangers by extruding or pressing a coated cladding material coated with a soldering substance and then brazing them through an assembly process. During the brazing process, the base material, A1 sheet, is not melted but the solder is melted and flows to the joint by capillary action and surface tension, thereby joining the components together.

In view of this, Japanese Patent Application Laid-Open Nos. Hei 5-128991 and Hei 6-339790 are applied to a surface of an Al sheet moving at a constant speed by applying a mixture of a solder material powder, a flux powder, and a binder to maintain a constant thickness. It is proposed to install a separate device for maintaining a constant thickness. However, since the thickness is adjusted by a mechanical method, there is a reliability problem with respect to the coating thickness. In particular, a thin coating layer may be coated on the surface of the thin Al sheet to damage the moving Al sheet.

Japanese Unexamined Patent Application Publication No. 5-244881 is designed to apply a liquid paste mixed with a braze alloy powder and a flux to the surface of a part to be joined to dry it, but since it uses a liquid paste, a separate drying process must be performed. As a result, the adhesion to the parts is not good and the brazing joints are not completely completed. In addition, when a non-uniform coating is applied, an erosion problem occurs in an over-coated portion, and a non-uniform bonding is formed in a low-coated portion. It also has the disadvantages of traditional atmosphere control brazing methods such as environmental pollution.

In Japanese Patent Application Laid-Open No. 7-185884, a flux layer is formed by attaching a flux to a surface of at least one side of a brazing sheet formed by cladding a material of Al solder on at least one surface of a core made of Al or Al alloy. Next, a method of manufacturing an Al alloy brazing sheet by rolling the brazing sheet and the flux layer in close contact with each other is disclosed. However, since the brazing material is clad on the surface of the core material, and the flux layer is formed again, the rolling process is performed, and thus the manufacturing process is complicated. In addition, there is a problem that the rolling itself is difficult, such as the flux is stuck to the rolling roller during rolling.

The present invention is directed to solving the above problems.

It is an object of the present invention to provide a method for applying a material for brazing of uniform and thin thickness to Al or Al alloy products requiring brazing.

It is still another object of the present invention to provide a method of applying a material for brazing to an Al or Al alloy product to achieve an excellent brazing effect.

It is still another object of the present invention to braze an Al or Al alloy product capable of forming a thin and uniform mixed powder layer regardless of the form of Al or Al alloy product intended to form a mixed powder layer such as a braze material powder or a flux powder. To provide a method for applying a material for.

A method of applying a material for brazing to an Al product according to the present invention comprises the steps of: moving at a constant speed an aluminum product requiring brazing made of an aluminum material; And applying a mixed powder having a braze powder and a flux powder on the surface of the aluminum product by electrostatic coating means to form a mixed powder layer.

According to one feature of the present invention, the method for applying a material for brazing to an Al product according to the present invention may be applied to any one made of Al or an Al alloy, but may be applied to a heat exchanger, a product or component for a heat exchanger, or the like. It is effective and particularly excellent for automotive heat exchangers or products or components for heat exchangers.

Unlike manufacturing or heat-exchanging products or components for heat exchangers using Al brazing sheets coated or clad with Al or Al-alloy sheets required for brazing, the heat exchangers or heat exchangers are assembled. Brazing materials do not require the same degree of adhesion as in Al brazing sheets, as components for use in machines do not undergo rough processing, such as rolling or pressing.

However, according to another feature of the present invention may further include a binder for better adhesion. The binder may be applied to the Al product together with the braze powder and the flux powder in powder form. Alternatively, the binder may be coated on the Al product by using a binder in solution to either or both of the solder powder and the flux powder.

In any case, when the binder is further included, a binder layer made of a binder powder constituting the mixed powder layer or a binder powder or flux powder or a binder coated on both of them is formed to form the solder in the binder layer. A baking step for fixing the ash powder and the flux powder may be further included.

The method according to the invention can also be applied to the manufacturing method of the Al brazing sheet or Al brazing material, in particular in the case of using a binder will be suitable in the case of requiring a strong adhesive force such as Al brazing sheet.

1 is an overall schematic view showing an example of a coating apparatus for implementing the method of the present invention.

2 is an overall schematic view showing another example of an application apparatus for implementing the method of the present invention.

Figure 3 shows a state in which the mixed powder is applied to the Al product suitable for the coating apparatus of Figure 1, Figure 3a is an enlarged cross-sectional view drawn exaggeratedly to show the application state of the mixed powder layer in particular, Figure 3b is a Some enlarged cross-sectional views.

FIG. 4 shows a state in which a mixed powder is applied to an Al product suitable for the coating apparatus of FIG. 2, and FIG. 4A shows a state in which a mixed powder layer is applied on an Al product, and FIG. 4B is a partially enlarged cross-sectional view of FIG.

FIG. 5 is an enlarged cross-sectional view of a portion showing a mixed powder having binder powder applied to the aluminum product of FIG. 3 or FIG. 4, before FIG. 5A is subjected to a baking process and FIG. 5B is after a baking process.

Figure 6 is an enlarged view showing that the binder is coated on the powder, Figure 6a is a solder powder, Figure 6b is a flux powder, and Figure 6c is a binder is coated on the mixed powder of the solder powder and flux powder, respectively Indicates that

FIG. 7 is a partially enlarged view illustrating a state in which a powder coated with a binder is coated on Al products of FIGS. 3 and 4, wherein FIG. 7A is before a baking process and FIG. 7B is after a baking process.

※ Explanation of symbols for main parts of drawing

10: coating device 12: supply coil

16,17: Al product 18: electrostatic coating device

20: electrode 22: sprayer

24: Mixed Powder 26: Baking Equipment

28: flux powder 29: binder powder

31: Binder 30: Binder Powder

32,34,35: mixed powder layer

Referring to the accompanying drawings, FIG. 1 is an overall schematic view showing an example of an applicator for implementing the method of the present invention, and FIG. 2 is an overall schematic view showing another example of an applicator. Figure 3 shows a state in which the mixed powder is applied to the Al product suitable for the coating apparatus of Figure 1, Figure 3a is an enlarged cross-sectional view drawn exaggeratedly to show the application state of the mixed powder layer in particular, Figure 3b is a Some enlarged cross-sectional views. FIG. 4 shows a state in which the mixed powder is applied to an Al product suitable for the coating apparatus of FIG. 2, and FIG. 4A is an enlarged cross-sectional view drawn exaggeratedly to show the application state of the mixed powder layer. A partially enlarged cross-sectional view of 4a. 5 is an enlarged cross-sectional view of a portion showing a state in which the mixed powder having binder powder is applied to the aluminum product of FIG. 3 or 4, FIG. 5A before the baking process and FIG. 5B after the baking process. In addition, the Al product referred to in the present invention refers to a thing made of Al or an Al alloy that requires brazing, in particular, a heat exchanger manufactured by using an Al brazing sheet, a component or a unitary part constituting the heat exchanger. More preferably, the vehicle heat exchanger manufactured by using an Al brazing sheet and components constituting the same are referred to. For example, a flat tube constituting a condenser in a vehicle heat exchanger is processed using an Al brazing sheet and then wound in a coil state. A flat tube wound in a coil state can apply a material for brazing. have. Therefore, in the case of Al products that can be coiled, such as flat tubes for condensers, it is preferable to use the applicator according to Fig. 1 of the present invention (see Figs. 1 and 3). For example, since an evaporator tube or an assembled heat exchanger such as an evaporator or a condenser cannot be coiled, it is preferable to use the coating apparatus according to Fig. 2 of the present invention (see Figs. 2 and 4). Of course, even in the case of a condenser tube, the coating apparatus according to FIG. 2 may be used after being cut to a predetermined length by an independent component without using a coil state.

Referring first to FIG. 1, the applicator 10 includes a supply coil 12 in which an Al product, such as an extruded tube of a vehicle condenser, is wound primarily from an Al material. The Al product 16 wound on the supply coil 12 is made of aluminum or aluminum alloy, and the Al product 16 is usually made hot or cold through a rolling process. When the supply coil 12 is moved at a constant speed and wound from the winding coil 12 to the winding coil 14, that is, when forming the mixed powder layer on the Al product 16 during coiling, desirable.

The Al product 16, which is moved from the supply coil 12 to the winding coil 14, passes through the electrostatic coating device 18. The Al product 16 includes the electrodes (e.g., installed in the electrostatic coating device 18). 20) pass through. In the electrostatic coating device 18, an appropriate spraying means-a sprayer 22 is installed so that the mixed powder 24 in which the braze material powder, the flux powder, the binder powder, etc. are mixed is sprayed, and the electrostatic coating device 18 is sprayed. Make sure it's scattered inside. When binder powder is used as one of the components of the mixed powder, the Al product 16 which has undergone the electrostatic coating device 18 is further subjected to the baking device 26, and the heat supplied from the baking device 26 is obtained. The binder powder 30 in the mixed powder layer 34 is dissolved and dried to form a binder layer 30a. The solder material powder 28, the flux powder 29, and the like are formed in the binder layer 30a. This fixation forms the coating layer 34a (see Fig. 5).

Referring to FIG. 2, the applicator 10 includes a conveyor 13 for moving an Al product such as a tube or heat exchanger of a vehicle evaporator, which is primarily processed from an Al material. The Al product 17 is made of aluminum or an aluminum alloy, and the Al product 16 is usually processed using a sheet of Al or Al alloy made hot or cold through a rolling process. The Al product suitable for the coating apparatus according to FIG. 2 is made of Al or Al alloy and refers to a component or heat exchanger itself for use in an assembly or finished product such as a vehicle heat exchanger, and also a brazing according to the present invention in a coiled state. Refers to the inability to carry out post-processing, such as applying a substance.

The Al product 17 moved by the conveyor 13 passes through the electrostatic coating device 18, and the Al product 17 passes between the electrodes 20 installed in the electrostatic coating device 18. . In the electrostatic coating device 18, an appropriate spraying means-a sprayer 22 is installed so that the mixed powder 24 in which the braze material powder, the flux powder, the binder powder, etc. are mixed is sprayed, and the electrostatic coating device 18 is sprayed. Make sure it's scattered inside. When binder powder is used as one of the components of the mixed powder, the Al product 17 which has undergone the electrostatic coating device 18 is further subjected to the baking device 26, and the heat supplied from the baking device 26 is obtained. ), The binder powder 30 forming the mixed powder layer 34 is dissolved and dried to form the binder layer 30a, and the solder material powder 28 and the flux powder (in the binder layer 30a) are formed. 29) and the like is fixed to form the coating layer 34a (see Fig. 5). The binder will be described later in detail.

In the material coating method for brazing the Al product of the present invention, the Al product (16, 17) may be any one made of Al or Al alloy produced by a conventional method, a representative example is the Al alloy of 3000, 6000 series You can hear it. And, among the components constituting the mixed powder 24, an alloy powder such as Al-Si alloy, Al-Si-Zn alloy, Al-Zn alloy, etc. may be mentioned. In addition, two or more kinds of powders among these enumerated alloy powders may be mixed and used at an appropriate ratio. In addition, as the solder powder, metal powders such as metal Al, metal Si, and metal Zn may be used, and two or more kinds of metal powders among these metal powders may be mixed and used in an appropriate ratio. Furthermore, one or more of each of the above alloy powders and metal powders may be mixed at an appropriate ratio and used as a solder powder. In either case, it is sufficient that it can be used as a brazing material for aluminum bonding.

Flux powder 29 constituting the mixed powder is also not particularly limited in kind and can be used a fluoride-based or chloride-based flux. The flux powder is preferably one having non-corrosive properties and includes, for example, "NOCOLOK" sold by Alcan International Limted.

Binders are used to ensure that the braze powder and flux powder are sufficiently adhered to the Al product, but are not necessary as in the brazing material clad Al brazing sheet. That is, the Al sheet clad with the solder powder and the flux powder is brazed through a post-processing process such as pressing, rolling, etc. to manufacture a heat exchanger, for example, so that the solder powder may be separated from the Al sheet during the processing. In order to prevent this separation phenomenon, it is preferable to mix the binder powder with the solder powder or the like or to coat the binder on the flux powder to apply the mixed powder on the Al sheet. However, the binder may not be used when post processing is not necessary. That is, for example, after manufacturing a component such as a header, a tube, etc. constituting a condenser using an Al sheet having no mixed powder layer, apply brazing material to the header or tube, and then assemble the components to form a condenser This is because, when brazing is performed, sufficient adhesive force can be obtained only by electrostatic coating as described later. Another reason for using a binder is especially for improving the adhesion of the flux powder. Since the solder powder is metallic, it adheres well to the Al product. However, in the case of flux whose main component is potassium fluoraluminate (potassium fluoaluminate), the adhesion by electrostatic coating tends to be somewhat inferior. Therefore, in particular, in the case of the flux powder, it is preferable to coat the binder on the flux powder using a liquid binder and to dry it, and then to make it into a powder state and electrostatic coating. Thus, by coating a binder on the flux powder and performing electrostatic coating, it is possible to apply good solder powder and flux powder even in the case of Al single products, products having a complicated shape compared to Al sheets, and finished products such as heat exchangers. Of course, the coating of the binder may be used for not only flux powder but also solder powder, and each powder may be separately coated with a binder, or both powders may be coated with a binder. Coating the binder on the flux powder is used in the case of the flux powder in order to prevent the adhesive force from dropping slightly compared to the solder powder when applied to the Al product by the electrostatic coating device. That is, it is used to improve the large power when using the electrostatic coating device by coating the binder on the flux powder. On the other hand, the binder may be coated on the solder powder as well as the flux powder to perform electrostatic coating. Thus, unlike in the manufacture of Al brazing sheet, it does not necessarily have to go through a baking process, and the baking process will be determined as necessary. That is, for example, when the binder is used for the purpose of improving the application of the flux powder to the Al product, and when rough post-processing such as rolling or extrusion is not necessary, the baking step does not have to proceed.

3 and 4 illustrate a state in which the mixed powder layer is applied to the Al product by the coating apparatus of FIGS. 1 and 2. In particular, referring to FIGS. 3B and 4B, the solder powder ( The mixed powder layer 32 of 28 and the flux powder 29 is formed. In this case, therefore, it is not necessary to perform the baking process by the baking apparatus 26.

However, if necessary, a binder may be used. The binder may be used in powder form together with the solder powder and the flux powder, or the binder may be coated on the solder powder, the flux powder or both powders, and then powdered. It is also possible to apply onto Al products 16 and 17 using the applicator of the present invention. First, referring to FIG. 5, FIG. 5 shows a state in which a mixed powder having binder powder is applied to the Al product 16 or 17 of FIG. 3 or 4. FIG. 5A is an enlarged cross-sectional view of a portion of the Al product 16 or 17 that has passed through the electrostatic coating device 18 prior to the baking process, and the surface of the Al product 16 or 17 has a solder powder 28 and a flux powder ( 29) and a mixed powder layer 34 composed of the binder powder 30 is formed. 5B is an enlarged cross-sectional view of a portion of the Al product after a baking process by the baking device 26, wherein the heat provided from the baking device 26 when the Al product 16 or 17 passes through the baking device 26 (FIG. 27, the binder powder 30 forming the mixed powder layer 34 is dissolved and dried to form the binder layer 30a. In this binder layer 30a, the braze material powder 28 and the plus powder 29 are fixed to form the coating layer 34a as a whole.

On the other hand, the binder may be coated on a flux powder or the like and then made into a powder state and applied onto an Al product. Figure 6 is an enlarged view showing that the binder is coated on the powder, Figure 6a is a solder powder, Figure 6b is a flux powder, and Figure 6c is a binder is coated on the mixed powder of the solder powder and flux powder, respectively Indicates that FIG. 7 is a partially enlarged view illustrating a state in which a powder coated with a binder is coated on Al products of FIGS. 3 and 4, before FIG. 7A is subjected to a baking process and FIG. 7B is after a baking process. FIG. 7 illustrates an example in which a binder 31 is coated on both the solder powder and the flux powder of FIG. 6C using a binder in a solution state, dried, and then made into a powder state and applied to an Al product 16 or 17. FIG. 7A shows that the mixed powder layer 35 is composed of a binder-coated solder powder 28 and a flux powder 29 before the baking process is performed. When the baking process is performed by the baking apparatus 26, the binder 31 coated on the solder powder 28 and the flux powder 29 is dissolved and dried to form the binder layer 31a. The binder layer 31a is formed to form the coating layer 35a in which the solder powder 28 and the flux powder 29 are fixed.

Of course, even when the binder is used, it is not necessary to perform the baking process. For example, even when an Al product is manufactured using an Al brazing sheet in which a brazing material and a flux are clad, the binder 31 is coated on both the brazing powder 28 and the flux powder 29 as shown in FIG. The brazing can then be done without the baking process. In this case, since the brazing material or flux powder coated on the Al brazing sheet may be separated during the processing, the binder is coated on both the brazing powder and the flux powder to perform the electrostatic coating to compensate for the loss caused by the separation. do. Therefore, it is not necessary to go through a baking process. Also, as shown in FIG. 6B, even when the binder 31 is coated with only the flux powder 29 and the electrostatic coating is not necessary, the baking process is not necessarily performed. This is performed by the electrostatic coating apparatus 18 by using the Al product 16 or 17. This is because the main purpose is to improve the large power when the flux powder 29 is applied onto it. Of course, even in this case, the baking process can be performed.

The binder used in the present invention is preferably pyrolyzed and evaporated before the flux is melted in the course of the brazing process, thereby improving the brazing performance by thermally decomposing and evaporating. Examples of such a binder include acrylic acid resins.

1 and 2 together, the Al products 16 and 17 pass through the electrostatic coating device 18, and in this process, the mixed powder 24 sprayed from the sprayer 22 is the Al product 16. Is painted on (17). The electrostatic coating device 18 uses electrostatic painting and / or coating, and as shown in FIG. 1, the powder is sprayed using the sprayer 22 to use an electrostatic force. The mixed powder 24 is coated. While the Al products 16 and 17 pass between the electrodes 20, the mixed powder sprayed through the atomizer 22 is adsorbed on the surface of the Al products 16 and 17 by electric force. Unlike the illustrated example, the mixed powder may be put in a suitable container installed on the bottom surface of the electrostatic coating device 18, and then injected with vibration and air so that the mixed powder is scattered so as to be adsorbed onto the Al products 16 and 17. will be. Electrode 20 is preferably composed of corona fin (corona fin). Thus, in the present invention, by using the electrostatic coating method, it is possible to form a coating layer having a uniform and thin thickness as compared to other methods, and also to form a coating layer of a uniform mixed powder regardless of the form of the Al product. In addition, according to the electrostatic coating method, since the coating layer is formed uniformly and thinly, subsequent processing is efficient, and even when the mixed powder does not contain the binder powder, it has excellent adhesion and adheres to the Al product. The mixed powder is more firmly adhered onto the Al product by further mixing the binder powder into the mixed powder or applying it using a binder coated powder and then going through a baking process as described later. Of course, the solder powder, the flux powder, etc. may be applied separately without mixing the various powders.

The baking process is performed when the binder powder 30 is used as one of the constituents of the mixed powder 24, or when the binder 31 is coated on the powder constituting the mixed powder such as the braze powder or the flux powder. It is a necessary process. When the binder powder 30 is used, the solder powder 28, the flux powder 29, and the binder powder 30 are placed on the Al products 16 and 17 which have passed through the electrostatic coating device 18, as shown in FIG. A mixed powder layer 34 made of) is formed. The case of electrostatic coating using the solder powder 28 and the flux powder 29 coated with the binder 31 is shown in FIG. In any case, the binder forming the mixed powder layers 34 and 35 is dissolved by the hot air 27 supplied from the baking apparatus 26 to fill the space between the braze material powders 28 and the flux powder 29. Done. If the heat 27 is continuously supplied for a predetermined time, the binder is dried and hardened to form the binder layers 30a and 31a. Therefore, the solder material powders 28 and the flux powders 29 are made of Al products (16). And 17 are fixed in the binder layers 30a and 31a in the state of electrostatic coating, thereby forming the coating layers 34a and 35a as a whole. As the binder layers 30a and 31a are formed as described above, the solder powder and the flux powder are firmly adhered to the Al product by the double adhesive force by the binder layer in addition to the adhesive force due to the electrostatic coating. Minimization of Al powder from Al powder due to migration during work and others.

The Al product coated with the brazing material manufactured by the above method is completed through necessary additional processes such as connection of a pipe for refrigerant flow in and out, for example, to make a heat exchanger. The mixed powder layers 32, 34 and 35 or the coating layers 34a and 35a adhered to the Al product are sufficiently firmly adhered and coated so that they are hardly separated from the Al products 16 and 17. The assembled product is brazed in a furnace. During the brazing process, the binder components constituting the binder layers 30a and 31a are thermally decomposed and evaporated so as not to affect subsequent brazing. After the evaporation of the binder component, the flux powder melts before the braze powder and flows into the portion to be brazed, thereby covering the portion, thereby inhibiting the reaction of oxygen in the furnace with the surface of the aluminum (ie, product). On the other hand, the aluminum oxide film that already exists is destroyed. In addition, the molten flux powder may also cover the solder material powder to prevent oxidation during brazing. Subsequently, the braze material powder is melted so that the braze material powder flows into the portion to be bonded in the direction in which the interfacial tension acts to cover the junction. The molten solder and flux are then solidified through the cooling process to complete the brazing and obtain the desired product.

The method of applying the mixed powder on the Al product according to the present invention can of course be applied to the production of Al brazing sheet or Al brazing material. In the case of Al brazing sheet, the brazing material, flux and binder are clad on Al sheet, and then processed to make components and then assembled and brazed. In the case of Al sheet, the electrostatic coating device is passed while moving at a constant speed from the supply coil to the take-up coil. At this time, the mixed powder is coated on the Al sheet. The binder powder as a component of the mixed powder may or may not be used, but in the case of an Al sheet, it is preferable to use. In case of using binder powder, it is better to go through baking process and then go through brazing process.

According to the method for applying a material for brazing to an Al product according to the present invention, it is possible to apply powder, such as flux, of thin and uniform thickness onto the Al product. The powder applied to the Al product is applied with sufficient adhesive force so that the applied powder does not deviate even in a subsequent processing step by using an electrostatic coating means, thereby achieving an excellent brazing effect.

Further, a thin and uniform powder layer such as flux can be formed on the Al product without being limited to the shape of the Al product. Since the dry powder is used directly, not in a liquid state, the working environment is clean and an environmentally friendly manufacturing method can be achieved.

Claims (17)

Moving the aluminum product requiring brazing made of aluminum at a constant speed; And Applying a mixed powder having a braze material powder and a flux powder on the surface of the product by electrostatic coating means to form a mixed powder layer How to apply a material for brazing to an aluminum product comprising a The method of claim 1, The mixed powder is a method of applying a material for brazing to an aluminum product further comprising a binder. The method of claim 2, A material for brazing in an aluminum product further comprising a baking step of forming a binder layer of the binder powder among the mixed powder layers formed on the surface of the product to fix the solder powder and the flux powder in the binder layer. How to apply. The method of claim 1, Said product applying a material for brazing to an aluminum product for use in a vehicle heat exchanger. The method of claim 1, And said article is coilable and that the material for brazing is applied to an aluminum article that moves said article at a constant speed while coiling said article wound in a coiled state. The method of claim 5, Said article is a tube for a vehicle condenser. The method of claim 1, Said product being independent of being uncoilable and applying a material for brazing to an aluminum product which moves said product at a constant speed by means of a conveyor. The method of claim 7, wherein Wherein said article is for use in a vehicle heat exchanger. Moving the aluminum product requiring brazing made of aluminum at a constant speed; And Applying a mixed powder having a solder powder and a flux powder coated with a binder on the surface of the product by electrostatic coating means to form a mixed powder layer; Method of applying a material for brazing to an aluminum product comprising a. The method of claim 9, Forming a binder layer made of the binder of the flux powder coated with the binder to apply the material for brazing to the aluminum product further comprising a baking step for fixing the solder powder and the flux powder in the binder layer. Way. The method of claim 10, The baking step includes dissolving the binder coated on the flux powder to form a binder layer to apply the braze powder and the flux powder, and drying the binder layer in a dissolved state. A method of applying a material for brazing. The method of claim 10, The solder powder is also coated with a binder, and the baking step forms a binder layer by the binder coated on the solder powder and the flux powder to fix the solder powder and the flux powder in the binder layer. A method of applying a material for brazing to an aluminum product. The method of claim 12, The baking step may include forming a binder layer to dissolve the binder coated on the solder material powder and the flux powder to apply the solder material powder and the flux powder, and drying the binder layer in a dissolved state. A method of applying a material for brazing to an aluminum product comprising. The method of claim 9, And said article is coilable and that the material for brazing is applied to an aluminum article that moves said article at a constant rate while recoiling said article wound in a coiled state. The method of claim 14, Said article is a tube for a vehicle condenser. The method of claim 9, Said product being independent of being uncoilable and applying a material for brazing to an aluminum product which moves said product at a constant speed by means of a conveyor. The method of claim 16, Wherein said article is for use in a vehicle heat exchanger.