JP2007042389A - Electric contact material manufacturing method and electric contact material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric contact material manufacturing method and an electric contact material capable of improving fixing property of graphite contained in plating. <P>SOLUTION: Silver plating 8 is formed on the surface of a parent material of the electric contact material 10 by electric plating. In doing so, powder of graphite 9 is mixed into a plating liquid, so that the graphite 9 is dispersed in the silver plating 8. Since the graphite itself has lubrication action, when a material with the silver plating 8 containing graphite 9 is used as an electric contact material 10, lubricants such as grease or oil do not have to be coated, therefore, the electric contact material 10 is used as grease-less sliding contacts. After forming the silver plating, the electric contact material 10 is put under pressurizing treatment for plastic deformation of a surface 8a of the silver plating 8, and the graphite 9 on the surface 8a is fixed on the silver plating 8. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an electrical contact material manufacturing method and electrical contact material used for, for example, a switching contact of an electrical circuit.

  Conventionally, as an electrical contact material used for a switching contact of an electrical circuit, for example, a sintered silver-graphite alloy as disclosed in Patent Documents 1 to 3 has been widely used. Graphite originally has little weldability, is extremely chemically stable, and has a very high lubricating action. Therefore, since the silver-graphite alloy containing graphite becomes a material having high slidability, if the silver-graphite alloy is used as an electrical contact material, it is not necessary to use a lubricant such as grease or oil. Silver-graphite alloys are used as greaseless sliding contact materials.

Here, when a sintered material is used, silver can contain a large amount of graphite, but if the graphite content relative to silver increases, there is a problem that the strength of the electrical contact material decreases and becomes brittle. Therefore, when considering the strength aspect of the electrical contact material, a method of producing an electrical contact material containing graphite by plating silver containing graphite on a base material such as copper, for example, is employed. .
JP 2002-53919 A JP-A-1996-13065 JP 63-7345 A

  However, the graphite in the silver plating is in a state where it is simply caught on the silver, and the graphite is likely to fall off when the product is transported, for example, in the manufacturing process. There was a situation where the fixability of was not so good. As described above, when the fixing property of graphite to silver is not good, the surface area ratio (surface graphite area ratio) of graphite to silver is reduced due to the falling of graphite, and there is a problem that the wear resistance is deteriorated accordingly. It was. In particular, when a graphite-containing electrical contact material is manufactured by plating, there is a limit to the amount of graphite that can be contained in silver, and therefore there is a high demand for reducing the falling graphite as much as possible.

  In order to improve the surface graphite area ratio, matte plating having a rougher surface shape than that of gloss plating may be used. This is because the surface shape of the matte plating is rougher than that of the glossy plating, and the amount of graphite taken in increases due to the large unevenness. However, when matte plating is used, there are many graphites that are attached to the plating surface, so there is a large amount of graphite that falls off that much. There was a demand to improve.

  The objective of this invention is providing the electrical contact material manufacturing method and electrical contact material which can improve the fixing property of the graphite contained in plating.

  In order to solve the above-mentioned problems, in the invention according to claim 1, pressure treatment is applied to a metal body containing graphite, and the surface of the metal body is plastically deformed to convert the graphite on the surface to the metal body. The main point is to fix it on the surface.

  According to the present invention, graphite itself has a lubricating action. Therefore, if graphite is contained in the metal body, the electrical contact material made of the metal body does not require a lubricant such as grease or oil. It can be used as a moving contact. In addition, since the surface of the metal body is plastically deformed by the pressure treatment, the periphery of the graphite is filled with the plastic body that has been plastically deformed. For example, the graphite that is simply caught on the metal body is the metal. Establish on the body. Therefore, it becomes difficult for graphite to fall off from the metal body, and the wear resistance of the electrical contact material is improved. Further, when the metal body is subjected to pressure treatment, the surface of the metal body is hardened and the hardness is increased, which is effective in further improving wear resistance.

  According to a second aspect of the present invention, in the first aspect of the present invention, the metal body is formed by forming a graphite-containing metal plating on a part of or the entire surface of the base material, and the metal body is added to the metal body. The gist is to apply pressure treatment to plastically deform the surface of the metal plating to fix the graphite contained in the metal plating to the metal plating.

  According to this invention, in addition to the operation of the invention described in claim 1, metal plating is formed on a part or the whole of the surface of the base material, and graphite is contained in the metal plating. Therefore, for example, even if a process for increasing the amount of graphite is performed, the amount of graphite increases in the metal plating, so that the material component of the base material remains unchanged, so that the strength of the base material decreases. In other words, the strength of the electrical contact material using the base material as a base material is sufficiently ensured.

  According to a third aspect of the present invention, in the second aspect of the present invention, the pressure treatment is performed by plastically deforming the metal of the metal plating by applying a roller to the surface of the metal body on which the metal plating is formed. The gist of this is the processing.

  According to this invention, in addition to the operation of the invention described in claim 2, since the metal body is pressed by the roller, it is possible to apply pressure to the metal body with simple and inexpensive equipment. .

The gist of the invention of claim 4 is that, in the invention of claim 2 or 3, the metal plating contains graphite.
According to the present invention, in addition to the action of the invention according to claim 2 or 3, since the metal plating contains graphite, the amount of graphite taken into the plating is simply applied to the surface of the metal plating. Compared to this, it increases relatively and contributes to ensuring high wear resistance.

  According to a fifth aspect of the present invention, in the invention according to any one of the second to fourth aspects, the graphite powder is applied to the surface of the metal plating, and the pressure treatment is performed after the dusting. The gist is to implement.

  According to this invention, in addition to the action of the invention according to any one of claims 2 to 4, since the graphite powder is applied to the metal plating containing graphite and then the pressure treatment is performed, the metal The amount of graphite fixed to the plating is increased, and the wear resistance is further improved.

  According to a sixth aspect of the present invention, in the invention according to any one of the second to fourth aspects, the graphite powder having a coating material that adheres to the metal plating is adhered to the surface. The gist is to apply the pressure treatment after the metal plating is applied to the surface of the metal plating.

  According to this invention, in addition to the action of the invention according to any one of claims 2 to 4, the amount of graphite fixed to the metal plating is increased in accordance with the amount of graphite applied. Is further improved. In addition, even if graphite is applied, the applied graphite has a coating material that adheres to the metal plating, so that the coated graphite is more easily fixed on the metal plating. This further increases the amount of graphite to be fixed on the surface, and is effective in further improving the wear resistance.

  According to a seventh aspect of the present invention, in the invention according to any one of the second to fourth aspects, the graphite powder obtained by adhering a coating material having an adhesion action to the metal plating on the surface is used. After the surface of the metal plating is applied, the metal foil having an adhesion action to the metal plating is placed on the surface of the metal plating, and the pressure treatment is performed in that state. To do.

  According to this invention, in addition to the action of the invention according to any one of claims 2 to 4, the amount of graphite fixed to the metal plating is increased in accordance with the amount of graphite applied. Is further improved. In addition, even if graphite is applied, the applied graphite has a coating material that adheres to the metal plating, so that the coated graphite is more easily fixed on the metal plating. This further increases the amount of graphite to be fixed on the surface, and is effective in further improving the wear resistance. Furthermore, pressure treatment is performed with a metal foil that adheres to the metal plating placed on the surface of the metal plating, so that the graphite in the metal plating and the graphite covered with the metal plating are more easily fixed on the metal plating. This also contributes to the improvement of wear resistance.

  In the invention according to claim 8, in the invention according to any one of claims 2 to 4, a metal foil having an adhesion action to the metal plating is placed on the surface of the metal plating, and the state thereof The gist is to perform the pressure treatment.

  According to this invention, in addition to the action of the invention according to any one of claims 2 to 4, the metal foil promotes the fixing of graphite, so that the graphite on the metal plating is further fixed to the metal plating. The amount of graphite to be fixed on the metal plating is further increased, which is effective in further improving the wear resistance.

The gist of the invention according to claim 9 is that, in the invention according to any one of claims 2 to 8, the metal plating is silver plating.
According to this invention, in addition to the operation of the invention according to any one of claims 2 to 8, since the silver plating is a material having high electrical conductivity, the metal plating is a graphite-containing silver plating. The electrical contact material becomes a material having high electrical conductivity.

  In the tenth aspect of the invention, the metal body containing graphite is subjected to pressure treatment, and the surface of the metal body is plastically deformed, whereby the graphite on the surface is fixed to the metal body. And In this case, the same effect as in the first aspect can be obtained.

  According to the present invention, the fixability of graphite contained in the plating can be improved.

  Hereinafter, an embodiment of an electrical contact material manufacturing method and an electrical contact material embodying the present invention will be described with reference to FIGS.

(Plating treatment)
FIG. 1 is a schematic configuration diagram showing a schematic configuration of the electroplating apparatus 1. The electroplating apparatus 1 immerses a base material 2 to be plated in a plating solution 4 in a plating bowl 3 and applies a DC voltage between an electrode (not shown) and the base material 2 that are also immersed in the plating solution 4. This is an apparatus for forming a metal plating layer on the surface of the base material 2. At this time, the base material 2 becomes a cathode (minus), the electrode becomes an anode (plus), and metal ions in the plating solution 4 are attracted to the base material 2, thereby forming metal plating on the base material 2.

  The base material 2 is wound around a roll and installed outside the plating basket 3. Through holes 5a and 5b are formed in the lower part of the pair of side walls 5 of the plating basket 3, and the base material 2 is wound up in an amount necessary for plating and introduced into the plating bowl 3 from one through hole 5a. After the plating process, the lead is led out from the other through hole 5b to the outside of the plating basket 3. Further, the plating solution 4 leaking from the through holes 5 a and 5 b is stored in a storage portion 6 below the plating basket 3, and the plating solution 4 is pumped up to the plating basket 3 by the pump device 7.

  Since the electroplating apparatus 1 of this example uses a molten solution of silver cyanide as the plating solution 4, silver plating 8 (see FIG. 2) is formed on the surface of the base material 2 such as copper as metal plating. When the silver plating 8 is formed on the base material 2 by the electroplating apparatus 1, for example, graphite 9 powder having a particle size of about 1 to 20 μm is mixed in the plating solution 4. Accordingly, when the silver component adheres to the base material 2 during the plating process, powdery graphite 9 is also taken together with the silver, and the silver plating 8 contains the powder of graphite 9 in a dispersed state as shown in FIG. It becomes a state. The base material 2 and the silver plating 8 constitute a metal body.

  By the way, since the graphite 9 itself has a lubricating action, when a material containing the graphite 9 in the silver plating 8 is used as the electrical contact material 10, a lubricant such as grease or oil is not applied. Therefore, the electrical contact material 10 is used as a greaseless sliding contact. The slidability of the electrical contact material 10 is determined by the amount of graphite 9 exposed on the surface.

  The silver plating 8 may be either glossy plating or matte plating, but the matte plating has a rough plating surface (large irregularities), so that the amount of graphite to be caught increases, and the graphite 9 has a corresponding amount. The surface graphite area ratio (surface area ratio of graphite 9 with respect to silver) S increases. However, in the case of matte plating, as shown in FIG. 2 (a), there is a large amount of graphite 9 that is only caught on the surface 8a of the silver plating 8, and there is a large amount of falling off of the graphite 9, so there is some countermeasure. It is necessary to apply.

(Pressure treatment)
FIG. 3 is a schematic configuration diagram showing a schematic configuration of the pressure treatment apparatus 11. The pressure treatment device 11 is a device that plastically deforms the surface of the workpiece by pressurizing the workpiece with a roller or the like. The pressure treatment device 11 includes a support base 12 on which the electrical contact material 10 is placed, a roller 13 that can be rotated, and a roller 13 that presses the electrical contact material 10 with a predetermined pressure in a predetermined direction. And a drive mechanism 14 that moves in the direction of arrow A in FIG. The drive mechanism 14 uses a motor or the like as a drive source.

  Next, a procedure for pressurizing the electrical contact material 10 with the pressurizing apparatus 11 to plastically deform the surface of the electrical contact material 10 will be described. When performing the pressurizing process, the plate is cut into a flat plate having a predetermined area after the plating process. The electrical contact material 10 thus set is set on the support 12 of the pressure treatment device 11. Then, the drive mechanism 14 presses the roller 13 against the electrical contact material 10 with a predetermined pressure, and in this state, the drive mechanism 14 moves the roller 13 in the direction of arrow A1 in FIG. Apply pressure to. At this time, the pressure value (predetermined pressure) applied to the surface 8a of the silver plating 8 by the roller 13 is set to a value such that the surface 8a of the silver plating 8 is plastically deformed.

  Therefore, since the surface 8a of the silver plating 8 is plastically deformed by the pressurizing process, the plastically deformed silver component is buried around the graphite 9 as shown in FIG. Therefore, the plastically deformed silver component strongly fixes the graphite 9 in the silver plating 8 around the periphery, and the fixability of the graphite 9 is enhanced. This makes it difficult for the graphite 9 to fall off the silver plating 8. Further, when the graphite 9 in the silver plating 8 is fixed by the pressure treatment, the surface hardness of the silver plating 8 is increased by the pressure treatment, so that the wear resistance of the silver plating 8 is further increased.

(Graphite treatment of graphite)
FIG. 4 is a cross-sectional view of an electrical contact material 10 produced by applying graphite powder to silver plating 8. When it is desired to increase the amount of graphite 9 on the surface 8a of the silver plating 8, as shown in FIG. 4 (a), the powder of graphite 15 may be uniformly coated, and thereafter a pressure treatment may be performed. The graphite 15 applied to the surface 8a of the silver plating 8 is made of the same material as the graphite 9 dispersed in the silver plating 8, and is applied to an extent that covers the surface 8a of the silver plating 8, for example. In addition, the process using the above-mentioned roller 13 is employ | adopted for the pressurization process performed after a sprinkling process, for example.

  When pressure treatment is performed after the graphite 15 is coated on the silver plating 8, the plastically deformed silver component fills the unevenness of the silver plating 8 as shown in FIG. The periphery of the dispersed graphite 9 and the graphite 15 covered with the silver plating 8 are both filled with the silver component. Accordingly, these graphites 9 and 15 are strongly fixed to the silver plating 8, and the fixing properties of the graphites 9 and 15 are improved. Further, the amount of graphite on the surface 8a of the silver plating 8 is increased according to the amount of the graphite 15 covered, the surface graphite area ratio S is increased, and the wear resistance of the silver plating 8 is further improved. .

  Here, the surface graphite area ratio S is appropriately determined depending on the amount of the graphite 15 to be sprinkled. FIG. 5 is a graph showing the relationship between the surface graphite area ratio S and the number N of durability thereof. The durability number N of the material 10 is determined. Accordingly, the durability count N differs depending on the target product specifications. However, in order to ensure sufficient wear resistance, the durability count N is 1 million times as shown in the graph of FIG. It is desirable to set the surface graphite area ratio S to .45 or more.

(Silver treatment of graphite with silver coating)
FIG. 6 is a cross-sectional view of an electrical contact material 10 produced by applying silver-coated graphite powder to silver plating 8. When it is desired to increase the amount of graphite 9 on the surface 8a of the silver plating 8, as shown in FIG. 6 (a), the graphite 16 powder coated with the silver coating 16a is uniformly coated and then subjected to pressure treatment. Good. The graphite 16 coated with the silver coating 16a is coated with silver, which is the same material as the silver plating 8, so that it has high adhesion to the silver plating 8 when pressed by the roller 13, and the silver plating 8 It is easy to settle.

  The graphite 16 to which the silver coating 16a is applied is made of the same material as the graphite 9 dispersed in the silver plating 8, and is coated so as to cover the surface 8a of the silver plating 8, for example. In addition, the pressurization process performed after the spraying process employs a process using the roller 13 or the like, as in the case of the above-described graphite 15 not coated with silver. The silver coating 16a corresponds to the coating material.

  After the graphite 16 coated with the silver coating 16a is applied to the silver plating 8, a pressure treatment is performed. In this treatment, the surface 8a (including the silver coating 16a) of the silver plating 8 is plastically deformed. As shown in FIG. 6B, these silver components plastically deformed are buried around the graphite 9 on the silver plating 8. Therefore, the plastically deformed silver component strongly fixes the graphites 9 and 16 at the periphery, and the fixing property of the graphite 9 is enhanced. This makes it difficult for the graphites 9 and 16 to fall off from the silver plating 8, the surface graphite area ratio S increases, and the wear resistance of the silver plating 8 is improved. In this case, the surface graphite area ratio S is preferably 0.45 or more as in the case where the uncoated graphite 15 is applied.

  In addition, since the graphite 16 used in the dusting process is coated with silver around the graphite 16, when the graphite 16 is pressed against the silver plating 8 by the roller 13, the dusting graphite 16 is formed by the adhesion of silver. It becomes easy to fix on the silver plating 8. Therefore, it contributes to improving the fixability of the graphite 16 to the silver plating 8, and the wear resistance is further improved. Further, if the fixability of the graphite 16 to be applied is improved, the majority of the graphite 16 to be applied is fixed to the silver plating 8, so that the surface graphite area ratio S does not easily vary on the surface 8 a of the silver plating 8. Also, it is effective for uniform dispersion of graphite 9 and 16.

(Process to put silver foil)
FIG. 7 is a cross-sectional view of the electrical contact material 10 produced by placing a silver foil on the surface 8 a of the silver plating 8. In order to improve the fixing property of the graphite 9 attached to the surface 8a of the silver plating 8, the graphite 16 having the silver coating 16a applied to the surface 8a of the silver plating 8 in which the graphite 9 is dispersed as shown in FIG. A pressure treatment may be applied after the silver foil 17 is placed on the screen. The silver foil 17 is laid, for example, over the entire surface 8a of the silver plating 8 so as to cover all of the graphite 16 coated on the surface 8a of the silver plating 8. The silver foil 17 corresponds to a metal foil.

  After the silver foil 17 is placed on the surface 8a of the silver plating 8, a pressure treatment is performed by the roller 13. In this treatment, the surface 8a, the silver coating 16a and the silver foil 17 of the silver plating 8 are plastically deformed, and FIG. As shown in b), the plastically deformed silver component is buried around the graphite 9, 16, and the graphite 9, 16 is fixed. Further, when the silver foil 17 is pressed against the silver plating 8 by the roller 13, the graphite graphite 16 is easily fixed to the silver plating 8 due to the adhesion of silver, and the fixing property of the graphite 16 to the silver plating 8 is improved. The silver plating 8 is effective in improving the wear resistance. In FIG. 7 (b), when actually used as an electrical contact material, the silver foil 17 is broken and the graphites 9 and 16 are exposed on the surface.

  When the silver foil 17 is placed on the silver plating 8 and the roller 13 is applied, it is not always necessary to cover the graphite 16. For example, as shown in FIGS. 8 (a) and 8 (b), the surface of the silver plating 8 on which the graphite 9 is dispersed. The silver foil 17 may be directly placed on 8a and the roller 13 may be applied thereto. In this case, the fixability of the graphite 9 in the silver plating 8 is enhanced. Further, even when the surface 8a of the silver plating 8 is coated with graphite, the graphite may be the graphite 15 that is not coated. Furthermore, the object on which the silver foil 17 is placed may be, for example, a silver plated material that does not contain graphite, or a silver alloy.

According to the configuration of the present embodiment, the following effects can be obtained.
(1) After the base material 2 is plated with graphite-containing silver plating 8, pressure treatment is applied to the surface 8 a of the silver plating 8, so that the plastically deformed silver component is buried around the graphite 9. The plastically deformed silver component strongly fixes the graphite 9 in the silver plating 8 at the periphery. Therefore, since many graphites 9 (15, 16) are strongly attached to the silver plating 8, the fixing property of the graphite 9 (15, 16) to the silver plating 8 can be improved. Furthermore, when the graphite 9 in the silver plating 8 is fixed by the pressure treatment, the surface hardness of the silver plating 8 is increased by the pressure treatment, so that the graphite 9 is firmly fixed to the silver plating 8. The wear resistance of the silver plating 8 can be further increased.

  (2) A silver-containing silver plating 8 is formed on the surface of the base material 2, and the slidability of the electrical contact material 10 is secured by the graphite 9 in the plating. Here, for example, even if a treatment for increasing the amount of graphite 9 is performed, the amount of graphite 9 increases in the silver plating 8, so that the material component of the base material 2 remains unchanged. Therefore, even if the amount of graphite 9 is increased, the strength of the base material 2 remains the same, so the strength of the electrical contact material 10 based on the base material 2 is not affected by the increase in graphite, and the electrical contact material 10 Sufficient strength can be secured.

(3) Since the pressurization process of this example is a process of pressurizing the electrical contact material 10 with the roller 13, the surface 8a of the silver plating 8 can be plastically deformed with simple and inexpensive equipment.
(4) When the pressure treatment is performed after the graphite 8 is coated on the surface 8a of the silver plating 8, the amount of graphite dispersed on the surface 8a of the silver plating 8 increases, so that the wear resistance of the silver plating 8 is increased. This can be further improved.

  (5) When the graphite 16 coated with the silver coating 16a is coated on the surface 8a of the silver plating 8 and then subjected to pressure treatment, the graphite 16 to be coated is coated with the silver coating 16a. It is possible to easily fix the dusted graphite to the silver plating 8 by the adhesion action. Further, if the fixing property of the graphite 16 covered with the silver plating 8 is improved, the surface graphite area ratio S is less likely to vary on the surface 8a of the silver plating 8, and the uniform dispersion of the graphite 9, 16 can be expected. .

  (6) When the surface 8a of the silver plating 8 is coated with the graphite 16 with the silver coating 16a and the silver foil 17 is placed on the graphite 16 to perform the pressure treatment, the silver having an adhesive action on the silver plating 8 Both the coating 16a and the silver foil 17 promote the fixing of the graphite 9, 16, and the fixing property of the graphite 9, 16 can be further improved. Therefore, the wear resistance of the silver plating 8 is further increased.

  (7) Since the silver plating 8 has high electrical conductivity as its plating characteristics, the metal plating applied to the electrical contact material 10 is the silver plating 8 to provide the electrical contact material 10 having high electrical conductivity. be able to.

In addition, this embodiment is not limited to the said structure, You may change into the following aspects.
The manufacturing process of the electrical contact material 10 is limited to a process of forming a graphite-containing silver plating 8 on the surface of the base material 2 and subjecting the surface 8a of the silver plating 8 to a pressure treatment to plastically deform the surface 8a. Not. For example, the base material 2 itself may be coated with graphite 9 powder and subjected to pressure treatment to cause plastic deformation of the surface of the base material 2, thereby fixing the graphite 9 to the base material 2.

The pressurizing process is not limited to the process of applying pressure with the roller 13, and the process is not particularly limited as long as it is a process that can apply the same pressure as that of the roller 13.
The base material 2 is not limited to copper, and other materials such as nickel may be employed.

  -When metal plating is formed by electroplating, the metal plating is not limited to silver plating 8, but for example, gold plating, electroless nickel plating, chrome plating, nickel plating, solder plating, tin plating, zinc plating, etc. may be adopted. Good.

-When the surrounding coated graphite 16 is coated, the material of the coating material is not limited to silver, and other materials such as tin may be used.
In the case where the silver foil 17 is placed on the silver plating 8 and the roller 13 is applied, the material of the metal foil placed on the plating is not particularly limited as long as it has an adhesive action with the plating material.

The plating method of the base material 2 is not limited to electroplating, and for example, chemical plating, hot dipping, physical vapor deposition, chemical vapor deposition, permeation plating, etc. may be employed.
Next, technical ideas that can be grasped from the above-described embodiment and other examples will be described below together with their effects.

  (1) In claim 1, the metal body is formed by forming a metal plating layer on a part or the whole of the surface of the base material, and spraying graphite powder on the surface of the metal plating layer. After that, pressure treatment is performed with the metal foil placed on the metal body, and the surface of the metal plating is plastically deformed to fix the graphite on the surface to the metal plating. In this case, since the graphite to which the coating material is not attached is dusted, the cost for the dusting graphite is reduced.

  (2) In Claim 1, the metal body is formed by coating a part or the whole of the surface of the base material with graphite powder, and after the dusting is performed, the metal body is placed on the metal body. A pressure treatment is performed to plastically deform the surface of the metal body to fix the graphite on the surface to the metal body. In this case, since the process of forming the metal plating on the base material is not performed, the cost for manufacturing the electrical contact material is reduced.

  (3) In the technical ideas (1) and (2), the graphite powder coated on the metal plating or the base material is a coating material having an adhesive action on the metal plating or the base material. Is attached to the surface. In this case, since the coating material promotes the fixation of graphite, the coated graphite is more easily fixed to the metal plating, and the amount of graphite fixed to the metal plating is further increased, which is effective in further improving the wear resistance. There is.

  (4) In any one of claims 2 to 9, the metal plating containing graphite is applied to the surface of the base material by electroplating by immersing the base material in a metal plating solution containing the graphite and energizing the base material. Is formed. In this case, since the metal plating is formed by electroplating, a substantially uniform and stable metal plating can be formed on the surface of the base material.

The schematic block diagram which shows schematic structure of the electroplating apparatus in one Embodiment. (A) is sectional drawing of the electrical contact material before performing a pressurization process, (b) is sectional drawing of the electrical contact material after performing a pressurization process. The schematic block diagram which shows schematic structure of a pressurization apparatus. (A) is sectional drawing of the electrical contact material at the time of sprinkling graphite powder to silver plating, (b) is sectional drawing of the electrical contact material after performing a pressurizing process after performing a sprinkling process. The graph which shows the relationship between the surface graphite area ratio and its durability. (A) is a cross-sectional view of an electric contact material when silver-coated graphite powder is applied to silver plating, and (b) is a cross-sectional view of the electric contact material after applying a pressure treatment by applying a spraying treatment. . (A) is a cross-sectional view of an electrical contact material when graphite is coated on a silver plating, and a silver foil is placed thereon, (b) is a cross-sectional view of the electrical contact material after the silver foil is placed and subjected to pressure treatment. . (A) is sectional drawing of the electrical contact material at the time of mounting silver foil on silver plating, (b) is sectional drawing of the electrical contact material after mounting a silver foil and performing a pressurization process.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 2 ... Base material which comprises a metal body, 8 ... Silver plating which comprises a metal body (metal plating), 8a ... Surface, 10 ... Electrical contact material, 9, 15, 16 ... Graphite, 13 ... Roller, 16a ... Coating material Silver coating as 17 ... Silver foil as metal foil.

Claims (10)

  A method for producing an electrical contact material, comprising subjecting a metal body containing graphite to pressure treatment, plastically deforming the surface of the metal body, and fixing the graphite on the surface to the metal body.   Forming the metal body by metal plating on a part or the whole surface of the base material, applying pressure treatment to the metal body to plastically deform the surface of the metal plating, and fixing the graphite to the metal plating; The method of manufacturing an electrical contact material according to claim 1.   3. The electrical contact material according to claim 2, wherein the pressurizing process is a process of plastically deforming the metal of the metal plating by applying a roller to the surface of the metal body on which the metal plating is formed. Production method.   The electrical contact material manufacturing method according to claim 2 or 3, wherein the metal plating contains graphite.   The electrical contact material manufacturing method according to any one of claims 2 to 4, wherein the graphite powder is applied to the surface of the metal plating, and the pressure treatment is performed after the application. .   A graphite powder having a coating material that adheres to the metal plating is applied to the surface of the metal plating, and the pressure treatment is performed after the dusting. Item 5. The method for producing an electrical contact material according to any one of Items 2 to 4.   A graphite powder having a coating material that adheres to the metal plating is applied to the surface of the metal plating, and after the dusting is performed, the graphite plating also has an adhesion action to the metal plating. 5. The method for producing an electrical contact material according to claim 2, wherein a metal foil is placed on the surface of the metal plating, and the pressure treatment is performed in that state.   5. The metal foil having an adhesive action on the metal plating is placed on the surface of the metal plating, and the pressure treatment is performed in this state. 6. Electrical contact material manufacturing method.   The electrical contact material manufacturing method according to any one of claims 2 to 8, wherein the metal plating is silver plating.   An electrical contact material, wherein a metal body containing graphite is subjected to pressure treatment, and the surface of the metal body is plastically deformed so that the graphite on the surface is fixed to the metal body.

Images