JP2697581B2 - Current collector slides made of sintered copper impregnated carbon material with high toughness and high conductivity - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a current collector plate used for a current collector of a railway vehicle.

[0002]

2. Description of the Related Art Conventionally, as a current collector plate used for a current collector of a railway vehicle, for example, Japanese Patent Application Laid-Open No. 61-24595
No. 7 is known. In view of the amount of tar pitch used as a binder at the time of production, this conventional current collector slide plate material is made of a carbon fiber reinforced carbon sintered body having a porosity of 12 to 16% and impregnated with Sb. It consists of union.

[0003]

On the other hand, the speeding up of railway vehicles in recent years has been remarkable, and in conjunction with this, the number of pantographs has to be reduced on the current collecting slide plate for the purpose of noise reduction. Although use under severer conditions is unavoidable, in the above-mentioned conventional current collector contact strip, the bending strength measured at the time of evaluating toughness is at most 940 kgf / cm ² , and the Charpy impact value is 3 .2
kgf · cm / cm ² only, and resistivity: 5
It has a conductivity of at least 00 μΩ · cm, and has relatively low conductivity. With such characteristics, cracks and chips are likely to occur when used under high-speed conditions, and at present it cannot be put to practical use.

[0004]

Means for Solving the Problems Accordingly, the present inventors have
In view of the above, the present inventors focused on the above-mentioned conventional current collector slide plate material, and conducted research to make it applicable to high-speed vehicles. As a result, a carbon fiber reinforced carbon sintered body constituting the current collector slide plate material Has a relatively large porosity of 18-27%
When impregnated with Cu or a Cu alloy, the resulting current-collecting contact strip has a carbon fiber reinforced carbon sintered body having a relatively high porosity and C impregnated in the pores.
Flexural strength: 1100 kgf /
The results show that it exhibits characteristics of not less than ² cm ² , Charpy impact value: not less than 4 kgf · cm / cm ² , and resistivity: not more than 400 μΩ · cm, and has further excellent toughness and conductivity. .

The present invention has been made based on the above research results, and is based on a copper-impregnated carbon obtained by impregnating a carbon fiber reinforced carbon sintered body having a porosity of 18 to 27% with Cu or a Cu alloy. It is composed of a sintered body and has a bending strength of 1
100 kgf / cm ² or more, Charpy impact value: 4 kgf · cm /
The present invention is characterized in that it has characteristics of a copper-impregnated carbon sintered body excellent in toughness and conductivity, having characteristics of not less than cm ² and a resistivity of not more than 400 μΩ · cm.

[0006] In the current collector sliding plate of the present invention,
The porosity of the carbon fiber reinforced carbon sintered body constituting
If the porosity is less than 18 %, the proportion of Cu or Cu alloy to be impregnated becomes too small, and the desired conductivity, that is, the resistivity of 400 μΩ · cm or less can be secured. not, by reason that the other hand, when the porosity exceeds 27%, the toughness decreases rapidly, can not be ensured 1,100 kgf / cm ² or more flexural strength and 4kgf · cm / cm ² or more Charpy impact value Things.

[0007]

Next, the present invention will be described in more detail with reference to examples. 10-20μ as raw material powder
m, and a pitch coke powder having a predetermined average particle size in the range of 10 to 20 μm, and P having a predetermined average diameter in the range of 10 to 20 μm and a predetermined average length in the range of 0.2 to 2 mm.
Using an AN-based carbon fiber powder, these two raw material powders are blended in a predetermined ratio, the porosity of the sintered body is adjusted, and a predetermined ratio of tar pitch is added for the purpose of exerting a binding action, and After kneading for 2 hours while heating to a predetermined temperature in the range of ~ 300 ° C, cooling to room temperature and adding the pulverized mixture, the mixture is compacted at a predetermined pressure in the range of 1 to 1.5 ton / cm ^2. Press molded into a body, and fired at 1150 ° C. for 1 hour to form a carbon fiber reinforced carbon sintered body shown in Table 1, and charged in a reduced pressure impregnation furnace with the dimensions adjusted, The pressure in the impregnation furnace was reduced to 2 torr, and in each case 11
Oxygen-free copper (pure Cu) heated to a temperature of 50 ° C., C
u-2% Sn alloy (referred to as Cu alloy A) or Cu-
By immersing in a molten metal of 2% Sn-10% Pb alloy (referred to as Cu alloy B) and performing impregnation with Cu or Cu alloy under the condition of applying a pressure of 130 atm, the thickness is 12 mm and the width is 12 mm. The current collector slabs 1 to 9 of the present invention having a size of 55 mm × length: 135 mm were manufactured. For the purpose of comparison, the porosity of the carbon fiber reinforced carbon sintered body was set as shown in Table 2, and the carbon fiber reinforced carbon sintered body was impregnated with pure Sb heated to a temperature of 800 ° C. under the same conditions as in the prior art. Electroplated plates 1 to 9 were produced.

[0008] A test piece having a size of 10 mm x 10 mm x 60 mm was cut out from each of the thus obtained various current collector slides, and the bending strength and the Charpy impact value of each of the five test pieces were evaluated for the purpose of evaluating toughness. For the purpose of measuring and evaluating the conductivity, the resistivity was measured for ten test pieces. These measurement results are shown in Tables 1 and 2 as average values. Furthermore, from the above-mentioned current collector slab, the thickness: 10 mm x the width: 2
A test piece having a size of 5 mm × length: 60 mm was cut out, and using this test piece, a current wear test was performed under the following conditions which were close to practical conditions.

In the current wear test, the outer diameter of the motor supported upright by fixing the center to the horizontal rotating shaft of the motor was 2.2 m.
A device in which a hard copper ring (JIS C1100 BB-H) having an outer diameter of 2 m, a width of 5 mm and a thickness of 15 mm is eccentrically mounted as a simulated trolley wire on the side opposite to the fixed side of the above-mentioned disc. On one side of the diameter line of the hard copper ring, first, the same thickness: 10 mm × width: 25 mm × length: 6
An Fe-based alloy sintered body having a size of 0 mm and containing hard Fe-Cr alloy: 6% and Fe-Mo alloy: 15% dispersed therein and having a porosity of 15% is impregnated with pure Pb. The Pb-impregnated Fe-based alloy sintered body was brought into surface contact under the following conditions: pressing force: 5 kgf, conduction current: 100 A, disk rotation speed: 25 km / h, time: 10 minutes. After making the surface the same surface condition as the trolley wire in practical use, the test piece was pressed on the other side of the diameter line of the hard copper ring with a pressing force: 5 kgf, a conduction current: 100 A, and a rotation speed of the disk: Surface contact under the conditions of 300 km / h, time: 10 minutes, and Pb-impregnated Fe under the above conditions
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. Tables 1 and 2 show the measurement results as average values. Tables 1 and 2 also show the results of observing the presence or absence of cracks and chipping of the test pieces after the test.

[0010]

[Table 1]

[0011]

[Table 2]

[0012]

According to the results shown in Tables 1 and 2, all of the current-collecting sliding plates 1 to 9 according to the present invention are the same as the conventional current-collecting sliding plates 1 to 9.
In addition to showing the same or higher wear resistance than that of the above, it shows further superior toughness and conductivity, and it is clear that there is no cracking or chipping even at high speed running. As described above, the current collector contact strip of the present invention has high toughness and high conductivity, so that it can be cracked or chipped even in a high-speed traveling vehicle of 300 km / h or more, which is used under extremely severe conditions. It shows excellent abrasion resistance without the occurrence of any such problems, and exhibits excellent performance over a long period of time.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroshi Tsuchiya 2-8-3 Hikaricho, Kokubunji-shi, Tokyo Inside the Railway Technical Research Institute (72) Inventor Masashi Koike 3-1 Koganecho, Niigata, Niigata Mitsubishi Materia Real Inc. Niigata Works (72) Inventor Toshio Teraoka 1-6-1, Otemachi, Chiyoda-ku, Tokyo Mitsubishi Materials Corporation (72) Inventor Yoshihisa Onishi 2181-2 Nakahime, Takuma-cho, Mitoyo-gun, Kagawa Prefecture Toyo Carbon Co., Ltd. Onohara Plant (56) References JP-A-51-105905 (JP, A)

Claims (1)

(57) [Claims] 1. A copper-impregnated carbon sintered body obtained by impregnating a carbon fiber reinforced carbon sintered body having a porosity of 18 to 27% with Cu or a Cu alloy, and having a bending strength of 1100.
A copper-impregnated carbon-impregnated carbon material having high toughness and high conductivity, having characteristics of not less than kgf / cm ² , Charpy impact value: not less than 4 kgf · cm / cm ² , and resistivity: not more than 400 μΩ · cm. Current collector plate.