JPH06284506A - Sliding current collecting material for pantograph - Google Patents

Abstract

PURPOSE:To provide a carbon sliding current collecting material, in which brittle fracture characteristics as the weak spot of a conventional carbon sliding current collecting material are improved and which has high strength, a sliding current collecting material for a pantograph. CONSTITUTION:A sliding current collecting material for a pantograph is acquired by joining carbon-metal composite baking materials containing metallic fibers from 5vol% to 60vol% on both side faces of a carbon sliding current collecting material for a core as the core. A pure carbon sliding current collecting material, a carbon sliding current collecting material, in which porous carbon is impregnated with a metal, a carbon sliding current collecting material, in which not more than 20vol% metallic fibers are contained in carbon powder, or a carbon sliding current collecting material, in which metallic powder is compounded, can be used as the carbon sliding current collecting material as the core. Accordingly, the sliding current collecting material has excellent low electric resistance and is superior even in strength and shock resistance while succeeding to the feature of the light-weight carbon sliding current collecting material having performance surpassing in lubricating properties, arc resistance, noise resistance, etc.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a carbon-based sliding collector material for a pantograph which can be applied to a pantograph sliding plate.

[0002]

2. Description of the Related Art At present, there are roughly two types of sliding current collector materials for pantographs, namely, metal materials such as casting alloys and sintered alloys and carbon materials.

The metal-based sliding current collector material has the features of extremely low electric resistance and high strength, but has a higher arc generation amount and higher strength than the carbon-based sliding current collector material. Therefore, it has a drawback that the amount of wear of the mating material increases.

Conventionally, as sliding current collectors for pantographs, mainly casting alloys such as copper, copper-iron alloys or copper-tin-zinc alloys, and sintered alloys such as copper or iron alloys have been used. Although metal-based materials are used, the environment in which sliding current collectors for pantographs are used has become more severe in recent years due to the increase in current-collecting capacity due to cooling of vehicles and the increase in vehicle operating speed. In addition, recently, the derailment rate has increased with the speeding up of vehicles, the amount of mechanical wear and the amount of arc wear have increased, and problems such as abnormal wear caused by freezing of trolley wires in cold regions However, there are problems such as noise pollution that the sliding noise is large. In view of these abrasions, therefore, there is a demand for a current collecting material having good sliding characteristics that reduces wear of not only the sliding plate itself, but also other materials such as trolley wires and electromotive rails. Further, the occurrence of an arc is regarded as a problem because it causes not only arc wear but also radio wave interference.

Carbon materials are expected to be able to make up for the drawbacks of these metal-based sliding current collector materials. This carbon-based sliding current collector has good self-lubricating properties, relatively low electrical resistance, excellent arc resistance, light weight and low sliding noise. The drawbacks of the metal-based sliding current collector material can be covered. However, this carbon-based sliding current collecting material has considerably higher electric resistance and extremely low strength as compared with the metal-based sliding current collecting material, and therefore cannot be used in places where a large force directly acts. Currently, these carbon-based materials are widely used for motor brushes and the like. By the way, even in the field of using such a carbon-based sliding current collecting material, the usage conditions thereof are becoming more and more severe, and under the present circumstances, further improvement of abrasion resistance and reduction of electric resistance are further required. . Further, the carbon-based sliding current collecting material is easily broken by carbon alone due to its brittleness, and if broken, the sliding current collecting material is scattered, which is dangerous. It becomes possible and the vehicle may stop.

Therefore, at present, investigations are being made in various fields in order to solve the drawbacks of the carbon-based sliding current collector material. For example, (1) a carbon-based sliding current collector material is impregnated with a metal (Japanese Patent Publication No. 52-822) or (2) a metal powder is added to a raw material powder of the carbon material (Japanese Patent Laid-Open No. 60-238,402). Therefore, a method of lowering electric resistance and improving strength has been proposed. However, although the methods (1) and (2) can be expected to have some effect in improving the strength, they cannot be expected to have the effect in preventing brittle fracture.

[0007]

An object of the present invention is to provide a high-strength carbon-based sliding current collecting material having improved brittle fracture characteristics, which is a weak point of conventional carbon-based sliding current collecting materials, that is, a slide for a pantograph. It is to provide a dynamic current collecting material.

[0008]

DISCLOSURE OF THE INVENTION The inventors of the present invention have remarkably lowered the electric resistivity by dispersing metal fibers in a carbon material and, at the same time, improved the brittleness and fragility of the carbon material. The present invention has been achieved by focusing on the metal-carbon composite fired material. That is, this metal-carbon composite fired material is processed into a thickness of several cm, and this is impregnated with pure carbon sliding current collector material or porous carbon material with metal, or carbon powder with metal powder or metal fiber. The strength of carbon-based sliding current collectors for cores is improved by joining the carbon-based sliding current collectors for cores, which are made of carbon-based sliding current collectors The inventors have found that it is possible to improve the impact resistance and the impact resistance, and have completed the present invention.

That is, the present invention is 5 vol% or more and 60
Sliding current collector for pantograph with improved strength and impact resistance by bonding carbon-metal composite calcined material containing less than vol% metal fiber to both sides of core carbon-based sliding current collector material for core It is a material. Here, as the carbon-based sliding current collecting material for the core to be the core, there are pure carbon sliding current collecting materials, carbon-based sliding current collecting materials obtained by impregnating porous carbon with metal, and carbon powder. It is possible to use a carbon-based sliding current collecting material obtained by containing metal fibers in a proportion of 20 vol% or less, or a carbon-based sliding current collecting material obtained by mixing metal powder.
Further, the both side surfaces of the carbon-based sliding current collector material for a core refer to side surfaces whose normal vector is the traveling direction of the electric train, specifically, two surfaces which are directly opposed to the traveling direction of the electric train. That is, since the train is normally driven back and forth, the pantograph to be used is provided with two surfaces facing each other so that the same effect can be obtained even if the traveling direction changes.

The details of the present invention will be described below. The raw material of the porous powder used in the production of the carbon-metal composite calcined material mixed with the metal fiber used in the present invention is a powder mainly composed of carbon such as pitch coke and graphite, and preferably pitch coke. This pitch coke contains petroleum-based or coal-based pitch in a non-oxidizing atmosphere at 400 to 55
There are raw coke obtained by heat treatment at 0 ° C. and calcined coke obtained by further calcining the raw coke at 1000 to 1400 ° C. Since the raw coke itself contains a binder component. It has excellent moldability, and
It is also excellent in that it can contain a large amount of metal fibers. When this raw coke is used, the volatile content in the raw coke is 5 to 17 wt%, preferably 8 to 14 wt% in order to reduce the probability of cracking or swelling during firing and increase the yield.
What was made into wt% is good. When a carbonaceous powder raw material such as calcined coke containing no binder component is used, a binder component such as binder pitch is added.

The addition amount of the binder varies depending on the kind, but when the binder pitch is used,
When a carbonaceous powder that does not contain a binder component such as calcined coke or a mixture of calcined coke and graphite powder is used, the addition amount is 100 carbonaceous powder.
50 to 120 parts by weight, preferably 70 parts by weight
-100 parts by weight, and when a carbonaceous powder such as a mixture of raw coke and graphite powder that contains a binder component but is insufficient in amount is used, the addition amount is carbonaceous powder. The amount is 10 to 50 parts by weight, preferably 25 to 35 parts by weight, per 100 parts by weight.

Examples of the metal fibers include copper, iron, fibers of copper or iron-based alloys, and mixtures of these fibers, but are not particularly limited, but metal fibers having high strength and low electrical resistivity. Is desirable. However, a material that is extremely harder than the sliding counterpart material is not preferable because it increases the amount of wear of the counterpart material, and a low melting point metal is not preferable because the metal melts out during firing and the firing temperature cannot be set high. .

The shape of the metal fiber is not particularly limited, but the fiber diameter is 1 mm or less because it does not hinder the sintering with the carbonaceous matrix and makes the blending uniform and easy. A fiber having a fiber length of 10 mm or less is preferable. Further, when the metal fiber prepared by the chattering cutting method in which the cross-sectional shape becomes an angular polygon is used, an effect such that a good molded body can be easily obtained during compression molding occurs.

The amount of the metal fibers added is in the range of 5 vol% or more and less than 60 vol%, preferably 10 to 45 vol%, based on the total amount of the carbonaceous powder raw material and the metal fibers. If the amount of the metal fiber added is less than 5 vol%, the electrical resistance will not be sufficiently lowered, and if it is more than 60 vol%, the sintering of the carbonaceous powder raw material will not proceed sufficiently and the strength will be lowered.

Next, the carbonaceous powder raw material and the metal fiber can be mixed by a general method, as long as it is a method such as a rocking mixer or a shaking method, which can be dispersed and mixed almost uniformly and randomly, and is not particularly limited. Although not a matter of interest, a mixing method in which a large shear force acts during the mixing and the metal fibers are bent or cut is not preferable.

The mixed raw material thus obtained is molded by cold isostatic pressing (CIP) or the like. When performing molding by cold isostatic pressing, a thick rubber die having a desired shape may be directly loaded with the mixed raw material, but 50 to 30
0 kgf / cm ² , preferably 100 to 200 kgf /
500-400 by cold isostatic pressing (CIP) after molding and preforming (uniaxial press) with a pressure of cm ^2.
0 kgf / cm ² , preferably 1500 to 2500 kg
It is easier to perform the main forming at f / cm ² . Even when the main molding is performed by ordinary mold molding (uniaxial press), the pressure from the direction perpendicular to the pressing direction is insufficient, and thus the entanglement of the metal fibers after molding is insufficient. However, when the main molding is carried out by a cold isostatic press (CIP), pressure is applied evenly to the molded body from the entire circumferential direction, and the metal fibers present in the molded body are sufficiently meshed with each other. The effect is high when added, and sufficient strength is obtained after firing.

Then, in an atmosphere of an inert gas such as argon or nitrogen, the temperature is lower than the melting point of the metal fiber, for example, 800 to 1.
By firing and carbonizing at 500 ° C. by a conventional method,
It is possible to obtain the material used for the lamination according to the present invention.

The carbon-metal composite calcined material containing metal fibers prepared in this manner is processed into a plate shape, which is used as a pure carbon sliding current collector material or a carbon-based material obtained by impregnating a porous carbon material with a metal. By joining to both sides of the carbon-based sliding current collector material for the core, which is the core of the sliding current collector, etc., by using a phenol resin or a carbon adhesive containing carbon powder mixed with resin, a low melting point metal, etc. It is possible to obtain a sliding current collector material for a pantograph which is resistant to lateral impact and is less likely to be brittlely broken.

Here, as the thickness of the carbon-metal composite calcined material containing metal fibers used for joining increases, the effect on impact increases, but a pure carbon sliding current collector or porous carbon is impregnated with metal. It is said that the carbon-based sliding current collector material for the core such as the above-mentioned carbon-based sliding current collector material has less trolley attack compared to the sintered metal sliding current collector and the metal fiber-containing sliding current collector material. Considering that the width of the sliding current collector sliding plate currently applied to the vehicle body is about 30 to 40 mm, the sandwiching pure carbon sliding current collecting material or the carbon-based sliding current collecting material is considered. It is preferable that the width of the carbon-based sliding current collector material for the core is as thick as possible, and the thickness of the material to be bonded is in the range of 2 to 10 mm, preferably 3 to 10 mm, and both sides are preferably bonded. . A thickness of less than 2 mm is less effective, on the contrary, 1
If it exceeds 0 mm, the width of the carbon-based sliding current collector material for the core to be sandwiched becomes narrow, and the effect of reducing the roughness of the trolley surface is diminished. Further, a pure metal material such as a sintered alloy material for pantograph can be considered as a material to be joined, but this is not preferable because the boat body of the pantograph equipped with the sliding current collector slide plate is easily damaged by an arc.

As the adhesive used for joining, furan resin, epoxy resin or the like can be used in addition to the phenol resin. However, even when the temperature of the sliding current collector sliding plate rises to a hundred and several tens of degrees during energization. Therefore, a thermosetting resin having a high carbonization yield such as a phenol resin or a furan resin is preferable. The reason is that at the time of heat curing or 1000 ℃
This is because, when it is fired, the generation of pores due to the generation of gas, volatile matter, etc. on the joint surface is small, and the strength is less likely to decrease. Further, in order to reduce the electric resistance in the bonding layer as much as possible,
A carbon adhesive in which carbon powder, particularly artificial graphite powder or natural graphite powder, is mixed with these resins is used. Further, if the sliding plate joined with this adhesive is fired up to about 600 to 700 ° C. in advance, even if the temperature of the sliding plate rises to several hundreds of ° C.,
Since the carbonization reaction in the adhesive layer is almost completed, there is no concern about the generation of pores at the bonding interface. On the other hand, a low melting point metal can be used for adhesion. Generally silver,
Silver braze and hard braze (Al: mainly composed of copper, zinc and silicon)
Si: Cu = 3.5%: 31.5%: 65%) or the like can be used. Among them, a hard brazing material having a high melting point (m.
p. : 550 to 600 ° C.) is preferable.

As a joining method, when a resin adhesive or a carbon adhesive is used, a plate-shaped pure carbon sliding current collecting material or a carbon-based sliding current collecting material obtained by impregnating porous carbon with a metal is used. These adhesives are applied to the side surfaces of the carbon-based sliding current collector material for a core with a spatula, but with regard to the application thickness at this time, the bonding strength tends to be higher when it is made as thin as possible, 5 to 200 μm, more preferably 50 to 100
The range is preferably μm.

After the adhesive is applied in this manner, a metal plate-shaped on both sides of the carbon-based sliding current collecting material for core such as pure carbon sliding current collecting material or carbon-based sliding current collecting material Attach carbon-metal composite fired material containing fiber, several kg / cm ²
Lightly sandwich it from both sides with pressure and then about 1
Bonding can be performed by heat curing in a dryer adjusted to 50 ° C.

When the adhesive is a brazing material, a brazing material having a thickness of 1 to 2 mm processed into a strip shape is used as a core carbon-based material such as a pure carbon sliding current collecting material or a carbon-based sliding current collecting material. It is sandwiched between a sliding current collector and a plate-shaped metal fiber-containing carbon-metal composite calcined material, lightly sandwiched from both sides and introduced into an electric furnace, and the melting point of the metal at which the brazing material melts (55
After the temperature is raised in an electric furnace to 0 to 600 ° C., it is cooled and joined. With a brazing material having a melting point higher than this temperature range, when a sliding current collecting material in which porous carbon is impregnated with a metal is used as the carbon-based sliding current collecting material for the core, it is sandwiched when the brazing material is melted. It is not preferable because the metal overflows from the carbon-based sliding current collector material for the core. Further, at a low temperature, the brazing material may melt and peel off when the temperature of the sliding plate during current collection rises to several hundred degrees.

The sliding current collector for pantograph thus produced has the following properties as compared with conventional pure carbon sliding current collectors and pantograph sliding current collectors obtained by impregnating porous carbon with a metal. It becomes a material with excellent impact resistance.

[0025]

EXAMPLES The present invention will be specifically described below based on Examples and Comparative Examples.

Example 1 A self-sintering raw coke having a volatile content of 12 wt% crushed to an average particle size of 8 μm was used to obtain a fiber diameter of 6 obtained by a chattering cutting method.
27 vol% of iron fiber with 0 μm and fiber length of 3 mm was added,
Temporary molding was performed with a molding pressure of 100 kg / cm ² using a mold having a size of 40 mm thickness × 120 mm length × 50 mm width. The obtained temporary molded body was loaded in a rubber bag, deaerated and then sealed, and main molding was performed by a cold isostatic press at 2000 kgf / cm ² . Then, under nitrogen atmosphere, 3 ° C / h
The temperature was raised to 1000 ° C. at r and fired to produce a carbon-metal composite fired material containing metal fibers, which was processed into a size of width 10 mm × thickness 3 mm × length 60 mm.

Next, a binder pitch was added to the calcined carbon powder, and the mixture was kneaded. Then, a pure carbon sliding current collector material extruded and fired at 1000 ° C. was formed into a width of 10 mm × a thickness of 4 mm × a length of 60.
It was processed into a size of mm, and a carbon adhesive containing a carbon powder mixed with a phenol resin was applied to both sides of the processed product and laminated.
Further, it was fastened with a metal fitting from both sides at a pressure of 5 kg / cm ² , and cured and bonded in a dryer set at 150 ° C. Using a Charby impact tester (manufactured by Toyo Seiki) equipped with a load of 10 kg, a swing-up angle of 150
An impact test was conducted without a notch. The results are shown in Table 1.

Example 2 A sample prepared by the same method as in Example 1 was placed in a muffle furnace to carbonize the adhesive in the joint at 800 ° C. under N ₂ gas flow, and then Charby impact with a load of 10 kg attached. Using a tester (manufactured by Toyo Seiki Co., Ltd.), an impact test was conducted with a swing-up angle of 150 degrees and no notch. The results are shown in Table 1.

Example 3 A sample was prepared in the same manner as in Example 1 except that a carbon-based sliding current collector in which porous carbon was impregnated with a metal was used as the sandwiching slide plate, and an impact test was conducted. Carried out. The results are shown in Table 1.

As the carbon-based sliding current collector material in which porous carbon was impregnated with a metal, the one manufactured as follows was used. First, calcined pitch coke was crushed to an average particle size of about 10 μm, 100 g of this pitch coke powder was kneaded with 35 parts by weight of binder pitch in an outer ratio, and then re-ground to prepare fine powder having an average particle size of 10 μm. Length of this powder 150
Put in a mold of width x width 100 x thickness 100 (unit mm), 5
After temporarily molding at a pressure of 0 kg / cm ² , this was filled in rubber and molded by CIP at a pressure of 1500 kg / cm ² . This was packed in a coke breeze and fired at a temperature rising rate of 0.1 ° C./min to 1500 ° C. under a N ₂ gas stream. The porosity 30 vol% porous carbon material thus obtained was loaded into an impregnating apparatus, the pressure was once reduced to several torr, and the Cu-Sn [mixing ratio (parts by weight); : 50] Immersed in alloy, 50 kg / cm
^A metal-impregnated sliding plate was produced by pressure impregnation at a pressure of ² .

Example 4 A sample was prepared in the same manner as in Example 2 except that a carbon-based sliding current collecting material in which porous carbon was impregnated with a metal was used as a sliding plate to be sandwiched, and an impact test was conducted. did. The results are shown in Table 1. As the carbon-based sliding current collecting material in which porous carbon was impregnated with metal, the same material as that described in Example 3 was used.

Example 5 A sample was prepared in the same manner as in Example 1 except that a carbon powder-containing sliding current collector containing metal powder was used as a sandwiching slide plate, and an impact test was conducted. The results are shown in Table 1.

The metal powder-containing carbon-based sliding current collector was manufactured as follows. First, a self-sintering raw coke having a volatile content of 12 wt% crushed to an average particle size of 8 μm and copper powder having an average particle size of 30 μm were mixed at a weight ratio of 1: 1 to obtain a thickness of 4
Temporary molding was carried out at a molding pressure of 100 kg / cm ² using a die having a size of 0 mm × length 120 mm × width 50 mm. The obtained temporary molded body was loaded into a rubber bag, deaerated and then sealed,
Main molding was performed by a cold isostatic press at 2000 kgf / cm ² . Then, under a nitrogen atmosphere, 100 at 3 ° C./hr.
The temperature was raised to 0 ° C. and firing was performed to prepare a metal powder-containing carbon-based sliding current collector material.

Example 6 A sample was prepared in the same manner as in Example 2 except that a carbon powder-containing sliding current collector containing metal powder was used as the sandwiching slide plate, and an impact test was conducted. The results are shown in Table 1. As the metal powder-containing sliding plate, the same one as described in Example 5 was used.

Example 7 A sample was prepared in the same manner as in Example 1 except that a carbon material for a carbon-metal composite fired pantograph containing 15 vol% of metal fibers was used as a sandwiching slide plate, and an impact test was conducted. did.

The carbon-metal composite fired material was prepared as follows. First, 15 vol% of iron fiber having a fiber diameter of 60 μm and a fiber length of 3 mm obtained by the chattering cutting method was added to a self-sintering raw coke having a volatile content of 12 wt% crushed to an average particle size of 8 μm to obtain 100 kg / cm ² . Temporary molding was performed using a mold having a size of 40 mm thickness × 120 mm length × 50 mm width by molding pressure. 2000 kgf / cm after loading the obtained temporary molded body into a rubber bag, degassing and then sealing.
Main molding was carried out at ² in a cold isostatic press. Next, in a nitrogen atmosphere, the temperature was raised up to 1000 ° C. at 3 ° C./hr and fired to produce a carbon-metal composite fired material containing metal fibers.

Example 8 A sample was prepared in the same manner as in Example 2 except that a carbon-metal composite calcined material containing 15 vol% of metal fibers was used as a sandwiching slide plate, and an impact test was carried out. As the carbon-metal composite calcined material, the same material as that described in Example 7 was used.

Example 9 A sample was prepared in the same manner as in Example 1 except that a thermosetting phenolic resin (RM3000 manufactured by Asahi Organic Chemical Industry Co., Ltd.) was used as an adhesive, and an impact test was carried out. The results are shown in Table 1.

Example 10 A sample was prepared in the same manner as in Example 2 except that a thermosetting phenolic resin (RM3000 manufactured by Asahi Organic Chemical Industries, Ltd.) was used as an adhesive, and an impact test was carried out. The results are shown in Table 1.

Example 11 A sample was prepared in the same manner as in Example 3 except that a thermosetting phenolic resin (RM3000 manufactured by Asahi Organic Chemical Industry Co., Ltd.) was used as an adhesive, and an impact test was carried out. The results are shown in Table 1.

Example 12 A sample was prepared in the same manner as in Example 4 except that a thermosetting phenolic resin (RM3000 manufactured by Asahi Organic Chemical Industry Co., Ltd.) was used as an adhesive, and an impact test was carried out. The results are shown in Table 1.

Example 13 A sample was prepared in the same manner as in Example 5 except that a thermosetting phenolic resin (RM3000 manufactured by Asahi Organic Chemical Industry Co., Ltd.) was used as an adhesive, and an impact test was carried out. The results are shown in Table 1.

Example 14 A sample was prepared in the same manner as in Example 6 except that a thermosetting phenolic resin (RM3000 manufactured by Asahi Organic Chemical Industry Co., Ltd.) was used as an adhesive, and an impact test was carried out. The results are shown in Table 1.

Example 15 A sample was prepared in the same manner as in Example 7 except that a thermosetting phenol resin (RM3000 manufactured by Asahi Organic Chemicals Industry Co., Ltd.) was used as an adhesive, and an impact test was carried out. The results are shown in Table 1.

Example 16 A sample was prepared in the same manner as in Example 8 except that a thermosetting phenolic resin (RM3000 manufactured by Asahi Organic Chemical Industry Co., Ltd.) was used as an adhesive, and an impact test was carried out. The results are shown in Table 1.

Example 17 As an adhesive, a brazing material (Al: Si: Cu = 3.5%: 3)
A sample was prepared and tested in the same manner as in Example 1 except that 1.5%: 65%) was used. The results are shown in Table 1.

Example 18 A brazing material (Al: Si: Cu = 3.5%: 3) as an adhesive.
A sample was prepared and tested in the same manner as in Example 3 except that 1.5%: 65%) was used. The results are shown in Table 1.

Example 19 A brazing material (Al: Si: Cu = 3.5%: 3) as an adhesive.
A sample was prepared and tested in the same manner as in Example 5 except that 1.5%: 65%) was used. The results are shown in Table 1.

Example 20 A brazing material (Al: Si: Cu = 3.5%: 3) as an adhesive
A sample was prepared and tested in the same manner as in Example 7, except that 1.5%: 65%) was used. The results are shown in Table 1.

COMPARATIVE EXAMPLE 1 A commercially available pure carbon sliding plate was prepared by extruding and calcining at 1000 ° C. after adding a binder pitch to calcined carbon powder and heat-bonding it to a size of 10 mm thick × 10 mm wide × 60 mm long. And processed into a Charby impact tester (manufactured by Toyo Seiki) with a load of 10 kg.
An impact test was conducted without a notch. The results are shown in Table 2.

Comparative Example 2 Pitch coke was crushed to an average particle size of 20 μm, 40 parts by weight of binder pitch was added to 100 parts by weight of this powder, the mixture was kneaded and mixed, and then crushed again to an average particle size of 20 μm. This was temporarily molded with a molding pressure of 100 kg / cm ^{2 using} a mold having a thickness of 40 mm × a length of 120 mm × a width of 50 mm, and the obtained temporary molded body was loaded into a rubber bag and deaerated. After that, the container was hermetically sealed and subjected to main molding by a cold isostatic press at 1000 kgf / cm ² . Then, in a nitrogen atmosphere at 3 ° C /
An alloy of copper-tin = 1: 1 (weight ratio) was added to the porous carbon material obtained by heating up to 1500 ° C. for 1 hr and calcining in an autoclave to several torr and then 50 kg / c.
Impregnation was carried out by pressurizing m ² . Width 1
It was processed into a size of 0 mm × thickness 10 mm × length 60 mm, using a Charby impact tester (manufactured by Toyo Seiki) equipped with a load of 10 kg, and a swing-up angle of 150
An impact test was conducted without a notch. The results are shown in Table 2.

COMPARATIVE EXAMPLE 3 A commercially available pure carbon sliding plate was used, which had a width of 10 mm, a thickness of 6 mm, and a length of 60.
The carbon-metal composite material containing metal fibers was processed into a size of 10 mm in width, 2 mm in thickness, and 60 mm in length, and a carbon adhesive was applied to bond them. In addition, tighten with a metal fitting from both sides at a pressure of 5 kg / cm ² , 150
Curing and bonding were performed in a dryer set at ℃. This is 10
Using a Charby impact tester (manufactured by Toyo Seiki Co., Ltd.) equipped with a load of kg, an impact test was performed with a swing-up angle of 150 degrees and no notch. The results are shown in Table 2.

[0053]

[Table 1]

[0054]

[Table 2]

As is clear from the results of Tables 1 and 2, the sliding collector material for a pantograph obtained by the method of the present invention has a conventional pure carbon sliding collector material or porous carbon containing a metal. Compared to the case of using impregnated carbon-based sliding current collectors, etc., it has been found that the strength is increased, the electrical resistance is low, and the impact resistance is also excellent. did.

[0056]

EFFECTS OF THE INVENTION According to the present invention, the characteristics of the carbon-based sliding current collector material, which is lightweight and has excellent performance in terms of lubricity, arc resistance, low noise, etc., are inherited as they are, It is possible to provide a very useful sliding current collector material for a pantograph which has electric resistance and also has good impact resistance.

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[Procedure amendment]

[Submission date] August 10, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction content]

[0008]

DISCLOSURE OF THE INVENTION The inventors of the present invention have remarkably lowered the electric resistivity by dispersing metal fibers in a carbon material and, at the same time, improved the brittleness and fragility of the carbon material. The present invention has been achieved by focusing on the metal-carbon composite fired material. That is, this metal-carbon composite fired material is processed to a thickness of several mm to 15 mm , and this is impregnated with a pure carbon sliding current collector material, a porous carbon material with a metal, or carbon powder with a metal powder or A carbon-based sliding current collecting material made of a carbon-based sliding current collecting material produced by blending 20 vol% or less of metal fibers, and the carbon-based sliding current collecting material for a core is bonded to both sides of the carbon-based sliding current collecting material for a core to be bonded to both sides. The inventors have found that the strength and impact resistance of the dynamic current collecting material can be improved, and have completed the present invention.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0035

[Correction method] Change

[Correction content]

Example 7 Charcoal containing 15 vol% of metal fibers as a sliding plate to be sandwiched
A sample was prepared in the same manner as in Example 1 except that the element-metal composite fired material was used, and an impact test was performed.

 ─────────────────────────────────────────────────── --- Continuation of the front page (72) Kenichiro Fujimoto, Inventor Kenichiro Fujimoto, 1618 Ida, Nakahara-ku, Kawasaki-shi, Kanagawa, within Advanced Technology Research Laboratories, Nippon Steel Corporation (72) Hiroshi Tsuchiya, Komibun, Kokubunji, Tokyo 2-chome 8th 38, inside the Railway Technical Research Institute (72) Inventor Shunichi Kubo 2-8 38, Hikarimachi, Kokubunji, Tokyo Inside the Railway Technical Research Institute

Claims (5)

[Claims] 1. A pantograph characterized in that a metal-carbon composite calcined material containing 5 vol% or more and less than 60 vol% of metal fibers is bonded to both sides of a carbon-based sliding current collector material for a core. Sliding current collector material. 2. The sliding current collector material for a pantograph according to claim 1, wherein the carbon-based sliding current collector material for the core, which is the core, is a pure carbon sliding current collector material. 3. The sliding current collector for a pantograph according to claim 1, wherein the carbon-based sliding current collector material for the core, which is the core, is a carbon-based sliding current collector material obtained by impregnating a porous carbon material with a metal. material. 4. The sliding current collector material for a pantograph according to claim 1, wherein the carbon-based sliding current collector material for the core to be the core is a carbon-based sliding current collector material containing a metal powder. 5. The sliding current collector material for a pantograph according to claim 1, wherein the carbon-based sliding current collector material for the core to be the core is a metal-carbon composite calcined material containing 20 vol% or less of metal fibers.