JPH0874007A - Pantagraph contact strip material for collecting current made of fe-base sintered alloy excellent in wear resistance - Google Patents

Abstract

PURPOSE: To produce a pantagraph contact strip material for collecting current made of an Fe-base sintered alloy excellent in wear resistance by mixing the powder of an Fe-base alloy having a specified compsn. and Fe-W alloy powder contg. TiC and W at a specified ratio and executing compacting and sintering. CONSTITUTION: The fine powder, 15 to 30%, of 1 to 150μm of an Fe-W alloy as a dispersed phase contg. 1 to 5% TiC, 60 to 90% W, and the balance Fe, and the balance powder of 1 to 150μm of an Fe-base alloy for a matrix contg. 0.1 to 0.5% C, 1 to 20% W, and the balance Fe are mixed, and this powdery mixed raw material is subjected to press molding into a sheet material, which is thereafter sintered at a high temp., e.g. of 1200 to 1250 deg.C. The pantagraph contact strip material for collecting current made of an Fe-base sintered alloy excellent in wear resistance, furthermore small in mating attackability and stably usable over a long period can be produced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an Fe-based sintered alloy pantograph sliding plate material for current collection, which has excellent wear resistance and low opponent attack.

[0002]

2. Description of the Related Art Conventionally, as described in, for example, Japanese Unexamined Patent Publication No. 5-105994, a current collector composed of an Fe-based sintered alloy having a structure in which hard particles exist as a dispersed phase in an Fe-based alloy matrix. Various pantograph sliding plate materials have been proposed and put to practical use.

[0003]

On the other hand, the speeding up of electric cars in recent years has been remarkable, and along with this, the wear resistance of pantograph slabs for current collection (hereinafter referred to as current slabs) has been further improved. However, in the conventional current collecting strip material, a material having excellent wear resistance has a high opponent attacking property, and a material having low opponent attacking property has a poor wear resistance.

[0004]

Therefore, the present inventors have
From the above viewpoint, without increasing the opponent's aggression,
As a result of research to develop a current collecting strip material having improved wear resistance, the current collecting strip material is expressed in% by weight (hereinafter,% means% by weight) and titanium carbide (hereinafter, Ti) as a dispersed phase.
(Indicated by C): 1 to 5%, similarly as a dispersed phase W: 60 to
Fe-W alloy containing 90%: 15 to 30%,
The rest has a composition consisting of a Fe-based alloy forming the matrix,
And the Fe-based alloy contains C: 0.1 to 0.5%,
When it is composed of a Fe-based sintered alloy having a composition of W: 1 to 20% and the balance of Fe and inevitable impurities, TiC constituting the dispersed phase has a Vickers hardness of about 320.
Since it has a high hardness of 0, the current collecting strip material has excellent wear resistance, and the Fe-W alloy also constituting the dispersed phase has a Vickers hardness of about 600.
The hardness is about 700, and this hardness is an intermediate hardness between the hardness of the Vickers hardness of the base material of about 120 and the hardness of the above TiC, and thus acts to mitigate the opponent attacking property by the TiC. , Also contributes to the improvement of wear resistance in the coexistence with TiC, and the C component and W component contained in the solid solution as a solid solution improve the strength of the base material, and the
It has been researched that it acts to improve the adhesion of the iC and Fe-W alloys to the base material, and as a result, the current collecting strip material has excellent wear resistance in the state of low opponent attack. Of.

The present invention has been made based on the above-mentioned research results, and TiC: 1 to 5 as a dispersed phase.
%, Similarly as a dispersed phase W: 60 to 90% Fe-
W alloy: 15 to 30%, and the rest is a Fe-based alloy forming a base, and the Fe-based alloy is C: 0.1 to 0.5%, W: 1 to Fe-based sintered alloy current collector plate material having excellent wear resistance, which is composed of an Fe-based sintered alloy having a composition of 20% and the balance of Fe and inevitable impurities Is.

Next, the reason why the composition of the Fe-based sintered alloy constituting the current collecting strip material of the present invention is limited as described above will be explained. (A) TiC The TiC component disperses in the base material as described above and has the effect of significantly improving the wear resistance due to its high hardness, but if its content is less than 1%, the desired excellent wear resistance is obtained. Cannot be ensured, and on the other hand, if the content exceeds 5%, the opponent's aggression will increase, so the content is defined as 1 to 5%, preferably 1.5 to 3.5%. It was

(B) Fe-W alloy The Fe-W alloy component is dispersed in the base material as described above, and Ti
In addition to contributing to the mitigation of opponent attack by the C component, it also contributes to improving wear resistance in the coexistence with the TiC component, but if the content is less than 15%, the desired effect can be obtained in the above action. On the other hand, if the content exceeds 30%, the aggression against the other party will increase. Therefore, the content is set to 15 to 30%, preferably 18 to 25%. Further, the W content of the Fe-W alloy needs to be 60 to 90%, and when the content is less than 60%, the hardness of the steel itself is lowered and the above-described action is satisfactorily exhibited. However, if the content exceeds 90%, the hardness becomes high, which causes the increase of the aggressiveness against the other party, and the content is preferably 70 to 85%.

(C) C component of the Fe-based alloy The C component of the Fe-based alloy has the function of forming a solid solution in the substrate to increase the strength and, in particular, to improve the adhesion of TiC to the substrate. If the content is less than 0.1% in the matrix, the desired effect of improving the above-mentioned action cannot be obtained, while if the content exceeds 0.5%, carbides are formed and Since the toughness decreases, its content is 0.1 to 0.5%, preferably 0.1.
It was set to 5 to 0.35%.

(D) W of Fe-based alloy The W component of the Fe-based alloy, which also constitutes the base material, forms a solid solution in the base material to improve the strength and also improves the adhesion of the Fe-W alloy to the base material. There is an action, but if the content is less than 1% in the matrix, the desired effect is not obtained, while if the content exceeds 20%, the toughness of the matrix decreases. The content was set to 1 to 20%, preferably 1.5 to 10%.

[0010]

EXAMPLES Next, the current collecting strip material of the present invention will be specifically described by way of examples. As raw material powder, 1 to
Has a predetermined average particle size within the range of 150 μm, and 1 to
Various Fe-W alloy powders with a predetermined W content within the range of 95%, and TiC powders, and an average particle size: 150 μm.
Atomized iron powder and graphite powder of 10 μm were prepared, and these raw material powders were mixed in a predetermined composition and mixed with a V-type mixer for 30 minutes, and then pressed into a green compact at a pressure of 6 ton / cm ^2. , This powder compact in vacuum, temperature: 12
The present invention having the composition and theoretical density ratio shown in Table 1 by sintering at a temperature of 00 to 1250 ° C. for 80 minutes and having dimensions of width 25 mm × thickness: 10 mm × length: 80 mm. Current collecting strips 1 to 14 and comparative current collecting strips 1 to 6 were manufactured, respectively. It should be noted that the comparative current collecting plate 1
Nos. 6 to 6 show that the Fe-based sintered alloy constituting the present invention has a content of components (marked with * in Table 2) that particularly influences wear resistance and opponent attacking property of the present invention. The composition is out of the range.

Next, an accelerated wear test was carried out on the various current collecting strips obtained as a result. The accelerated wear test is
Outer diameter: 2m x width: 5mm x thickness as a simulated trolley wire on the side opposite to the fixed side of a disc with an outer diameter of 2.2m supported upright by fixing the center to the horizontal rotation shaft of the motor. S: 15 mm hard copper ring (JIS / C1100 / BB-
H) is installed with an eccentricity of 50 mm, and the above-mentioned current collecting strips are installed on both sides of the diameter line of the above hard copper ring.
With a pressing force of kg, the dimension surface of length: 80 mm × width: 25 mm is brought into surface contact, and 200 A is applied between the simulated trolley wire and the current collecting strip plate material.
Rotate the above disk for 5 minutes while flowing the current of 250 km
After increasing the rotation speed to / hr and maintaining this speed for 5 minutes,
Stopping was performed for 5 minutes as one cycle, and this was repeated 5 times to measure the specific wear amount of the current collecting strip material and the wear depth of the mating trolley wire as the mating material. The measurement results are shown in Tables 1 and 2.

[0012]

[Table 1]

[0013]

[Table 2]

[0014]

From the results shown in Tables 1 and 2, the current collecting and sliding board materials 1 to 14 of the present invention all show excellent wear resistance in the state of maintaining low opponent attacking property. As can be seen from the comparative current collecting strip materials 1 to 6, the TiC content and the Fe-W alloy content in the Fe-based sintered alloy constituting the same and the W content in the Fe-W alloy are within the range of the present invention. It is clear that if it comes off, it will be inferior in wear resistance or opponent attack. As described above, the current collecting strip material of the present invention has excellent wear resistance and extremely low opponent attacking ability, and can satisfactorily correspond to the speeding up of the electric vehicle and can be used for a long period of time. It exhibits excellent performance.

Claims (1)

[Claims] Claims: 1. By weight%, titanium carbide: 1 to 5% as a dispersed phase, Fe: W alloy containing W: 60 to 90% as a dispersed phase: 15 to 30%; Forming F
The composition has an e-based alloy, and the Fe-based alloy contains C: 0.1 to 0.5%, W: 1 to 20%, and the balance is Fe and inevitable impurities. F
An Fe-based sintered alloy current collector pantograph sliding plate material having excellent wear resistance, characterized by being composed of an e-based sintered alloy.