JP2000302578A - Current collecting slider material consisting of copper- impregnated carbon fired compact and having excellent wear resistance at high speed traveling - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve wear resistance at the time of high speed traveling by impregnating pure copper into a carbon fired body having a specified composition and porosity. SOLUTION: A carbon fired body having a structure that 3 to 15 wt.% artificial graphite is dispersed in the body of fired coke and having a porosity of 18 to 27% is obtained by first mixing pitch coke powder having an average particle size of 10 to 20 μm and artificial graphite powder having an average particle size of 10 to 30 μm in a prescribed ratio to obtain a mixed powder, then adding tar pitch in a prescribed ratio to the mixture in order to control the porosity of carbon fire body and to allow it to exhibit binding function, kneading the obtained mixture at 200 to 300 deg.C for about 2 h, cooling the mixture to the room temp., then pulverizing and mixing, further press-forming the obtained powder under a pressure of 0.1 to 1 ton/cm2 and finally firing the formed material. The copper impregnated carbon fired body useful for a current collecting slider material and having resistivity of <=1 μΩ.m is obtained by controlling the dimension of the carbon fired body mentioned above, introducing the carbon fired body into a furnace capable of impregnating under a reduced pressure, after reducing the pressure in the furnace to about 2 Torr, immersing the carbon fired body into the molten liquid of copper free from oxygen and being heated to about 1,200 deg.C, and impregnating copper into the carbon fired body by applying a pressure of about 130 atom.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an abrasion resistance, especially when used at high speeds, when used as a current collector plate for electric vehicles (hereinafter referred to as ordinary electric vehicles) such as JR conventional lines and private railways. The present invention relates to a current collector slide plate made of a calcined body of copper impregnated with carbon and exhibiting the following characteristics.

[0002]

2. Description of the Related Art Conventionally, a copper impregnated carbon fired body obtained by impregnating pure copper into a carbon fired body having a porosity of, for example, 18 to 27% and having a porosity of 18 to 27% has been used as a current collector sliding plate material for an ordinary electric vehicle. Are widely used in practice. Further, this current collector slab material was added to a pitch coke powder as a raw material, a tar pitch of a predetermined ratio was added for the purpose of adjusting porosity and imparting a binder effect, and kneaded while heating to 200 to 300 ° C. After cooling to crushing and mixing,
Press molding into a green compact at a pressure of 1.5 ton / cm ² ,
This green compact is fired at 1200 to 1500 ° C. to obtain calcined coke, that is, carbon composed of the above-mentioned pitch coke powder and calcined coke formed by firing tar pitch, and having a porosity of 18 to 27%. It is also well known that a fired body is formed, and then the carbon fired body is immersed in a pure copper melt in a reduced pressure atmosphere, and then subjected to a copper impregnation treatment in which the atmosphere is a pressurized atmosphere of 100 to 150 atm. Is being done.

[0003]

On the other hand, in recent years, ordinary electric vehicles have also tended to travel at high speeds like the JR Shinkansen, but the normal traveling speed of about 100 km / hr has been increased to 150 km / hr.
When the speed is increased to at least hr, the wear of the above-mentioned conventional current collector slab becomes extremely fast, and at present, it cannot be put to practical use.

[0004]

Means for Solving the Problems Accordingly, the present inventors have
From the above-mentioned viewpoints, focusing on the above-mentioned conventional current collector slab, and conducting research to improve the wear resistance of the current collector slab at high speed running, the current collector slab was converted to a base material of calcined coke by 3 to When composed of a carbon-impregnated carbon fired body obtained by impregnating pure copper into a carbon fired body having a structure in which 15% by weight of artificial graphite is dispersed and distributed, and a porosity of 18 to 27%, The research results show that artificial graphite dispersed and distributed in calcined coke, which constitutes the base material of the carbon fired body, significantly suppresses abrasion during high-speed running and exhibits excellent abrasion resistance over a long period of time. It was.

[0005] The present invention has been made based on the above research results, and 3 to 15
By weight of artificial graphite dispersed and distributed,
A current-collected ground plate made of a copper-impregnated carbon fired body exhibiting excellent wear resistance at high speed running, comprising a copper-impregnated carbon fired body obtained by impregnating pure copper into a carbon fired body having a porosity of 7%. It has characteristics in the ground plate material.

[0006] In the carbon fired body constituting the current collector sliding plate material of the present invention, the content ratio of artificial graphite is set to 3 to 15% by weight. This is because the effect of improving the porosity cannot be obtained, while if the content exceeds 15% by weight, the strength rapidly decreases, and the porosity is 18 to 27.
If the porosity is less than 18%, the percentage of pure copper impregnated is too small to achieve the desired conductivity, that is, a resistivity of 1 μΩ · m or less. When the ratio exceeds 27%, the strength is sharply reduced.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the current collector slide plate of the present invention will be described in detail with reference to examples. As raw material powder, 1
Using a pitch coke powder having a predetermined average particle size in the range of 0 to 20 μm, and an artificial graphite powder having a predetermined average diameter in the range of 10 to 30 μm, blending these two raw material powders in a predetermined ratio, To this, while adjusting the porosity of the carbon fired body, a predetermined ratio of tar pitch is added for the purpose of exerting a binding action, and the mixture is kneaded for 2 hours while being heated to a predetermined temperature in the range of 200 to 300 ° C. After cooling to room temperature and adding the pulverized mixture, the mixture is pressed into a green compact at a predetermined pressure in the range of 0.1 to 1 ton / cm ² , and calcined at 1200 ° C. for 1 hour. A carbon fired body having the artificial graphite content and the porosity shown in 1 was formed and charged in a reduced-pressure impregnation furnace with its dimensions adjusted, and the pressure in the impregnation furnace was set to:
The pressure was reduced to 2 torr, and both were immersed in a melt of oxygen-free copper (pure copper) heated to a temperature of 1200 ° C., and were subjected to copper impregnation under a condition of applying a pressure of 130 atm. The current collector slabs 1 to 12 of the present invention having dimensions of width: 55 mm × length: 135 mm were produced. Also,
For the purpose of comparison, current collector slides 1 to 3 were manufactured under the same conditions except that a carbon fired body having no artificial graphite and having a porosity as shown in Table 1 was used.

[0008] Test pieces having dimensions of 10 mm x 10 mm x 60 mm were cut out from the various current collector slides obtained as a result, and the Charpy impact values were each evaluated for the purpose of evaluating the strength.
The resistivity was measured for ten test pieces, and the resistivity was measured for ten test pieces for the purpose of evaluating conductivity. These measurement results are shown in Table 1 as average values.

[0009] Further, from the above-mentioned current collector slide plate material, the thickness:
A test piece having a size of 10 mm × width: 25 mm × length: 60 mm was cut out, and an electric wear test was performed using the test piece under the following conditions, which are high-speed running conditions for an ordinary electric vehicle. The current-carrying abrasion test was carried out by simulating a trolley wire on a side opposite to the fixed side of a disk having an outer diameter of 2.2 m, which was supported upright by fixing the center to the horizontal rotating shaft of the motor. : 5mm x thickness: 15mm hard copper ring (JI
S.C1100.BB-H) is mounted on the hard copper ring with an eccentricity of 50 mm. On one side of the diameter line of the above-mentioned hard copper ring, first, the same thickness: 10 mm × width: 25 mm × length: 60 mm is provided. And hard Fe-Cr alloy: 6% and Fe-
Mo alloy: A Pb-impregnated Fe-based alloy sintered body obtained by impregnating pure Pb into an Fe-based alloy sintered body having a porosity of 15% with a dispersed content of 15%, a pressing force of 5 kgf, and a conduction current. : 100 A, rotating speed of the disc: 25 km / h, time: 10 minutes, and the surface of the hard copper ring was brought into a surface state equivalent to a trolley wire in a practical state. The test piece was brought into surface contact with the other side on the diameter line of the copper ring under the following conditions: pressing force: 5 kgf, conduction current: 200 A, disk rotation speed: 160 km / h, time: 10 minutes. Fe impregnated with Pb
The alternating surface contact of the base alloy sintered body and the test piece was repeated twice each, a total of three times, and the current wear test was performed on each of the five test pieces, and the specific wear after the test was measured. Table 1 shows this measurement result as an average value.
It was shown to.

[0010]

[Table 1]

[0011]

According to the results shown in Table 1, the current-collecting contact strips 1 to 12 of the present invention show the same strength and conductivity as those of the conventional current-collecting contact strips 1 to 3 and can be operated at high speed. It is evident that the abrasion resistance is further improved. As described above, the current collector contact strip of the present invention exhibits excellent wear resistance at high speeds and exhibits excellent performance over a long period of time. It is compatible.

Continuing from the front page (72) Inventor Shunichi Kubo 2-8-8 Hikaricho, Kokubunji-shi, Tokyo Inside the Railway Technical Research Institute (72) Inventor Minoru Ikeuchi 2-8-8 Hikaricho, Kokubunji-shi, Tokyo 38 Railway Company Within the Research Institute of Technology (72) Inventor Hiroshi Tsuchiya 2-8-8 Hikarimachi, Kokubunji-shi, Tokyo Within the Research Institute of Railway Technology (72) Inventor Teruo Shimizu 1-5-1, Otemachi, Chiyoda-ku, Tokyo Inside Materials Co., Ltd. (72) Inventor Shinichi Akiyama 1-5-1, Otemachi, Chiyoda-ku, Tokyo Mitsui Materials Co., Ltd. (72) Inventor Toshio Teraoka 1-3-5-1, Otemachi, Chiyoda-ku, Tokyo 3 Inside Ryo Materials Co., Ltd. F-term (reference) 4 K020 AA23 AC04 BA02 BA05 BB26 5H105 AA08 BA02 BB01 CC02 CC12 DD03 DD28 DD29

Claims (1)

[Claims] 1. A copper-impregnated carbon fired body obtained by impregnating pure copper into a carbon fired body having a structure in which 3 to 15% by weight of artificial graphite is dispersed and distributed in a base of calcined coke and a porosity of 18 to 27%. A current collector strip made of a calcined carbon-impregnated carbon material exhibiting excellent wear resistance at high speed running, characterized by comprising: