JPH08109451A - Contact strip material for current collecting pantagraph made of wear resistant iron-base sintered alloy excellent in electrical conductivity - Google Patents

Abstract

PURPOSE: To produce the contact strip material for a current collecting pantagraph made of a wear resistant Fe-base sintered alloy excellent in electrical conductivity. CONSTITUTION: This contact strip material consists of an Fe-base sintered alloy having a compsn. contg., as dispersed phase forming components, 5 to 20% of one or more kinds among TaB2 , NbB2 , ZrN, TaC and WC, contg. also, as dispersed phase forming components, 5 to 20% of one or more kinds among TiSi2 , WSi2 and MoSi2 , contg., as matrix forming components, 0.1 to 7% of one or more kinds among Ni, Cu and Mn, furthermore contg., at need, 0.05 to 3% Cr and/or Mo, moreover contg. either or both of 0.05 to 3% Cr and/or Mo and 0.05 to 0.5% C, and the balance Fe with inevitable impurities.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has excellent electrical conductivity, excellent wear resistance, and low opponent attack, and therefore has a high current collecting capability and can be used for a long period of time. The present invention relates to an Fe-based sintered alloy current collector pantograph sliding plate material exhibiting excellent performance.

[0002]

2. Description of the Related Art Conventionally, various kinds of Fe-based sintered alloys having a structure in which hard particles are dispersed and distributed in an Fe-based alloy base have been proposed and put into practical use as pantograph sliding plate materials for collecting electric vehicles. ing.

[0003]

On the other hand, in recent years, electric vehicles have become larger and more connected, and the speed has been remarkably high. Accordingly, as much current as possible should be taken into the pantograph sliding plate material for current collection. The characteristics that can be achieved, namely high conductivity and further improvement in wear resistance are required,
Among the Fe-based sintered alloy current collector pantograph sliding plate materials (hereinafter simply referred to as current collecting sliding plate materials) that have been proposed and put into practical use, those with excellent wear resistance have low conductivity, and conversely At present, it is not possible to satisfactorily meet these requirements because a material having good conductivity has poor wear resistance and does not have both characteristics of conductivity and wear resistance.

[0004]

Therefore, the present inventors have
From the above viewpoints, as a result of conducting research to develop a current collecting strip material excellent in conductivity and wear resistance, the current collecting strip material is expressed in% by weight (hereinafter,% means% by weight), As a dispersed phase forming component, Ta boride, Nb boride, Z
One or more of r-nitride, Ta carbide, and W carbide (hereinafter referred to as TaB ₂ , NbB ₂ , ZrN, TaC, and WC, respectively, which are collectively referred to as “hard dispersed particles”). : 5 to 20%, similarly as a dispersed phase forming component, silicides of Ti, W, and Mo (hereinafter, TiSi ₂ , WSi ₂ , and MoSi ₂ respectively)
, And these are collectively referred to as "intermediate hardness dispersion particles"): 1 type or 2 types or more: 5 to 20%, all of which are 1 of Ni, Cu, and Mn as a base forming component. Or 2 or more kinds: 0.1 to 7%,
Further, if necessary, (a) Cr and / or M
o: 0.05 to 3%, (b) C: 0.05 to 0.5
%, At least (a) and / or (b) is contained, and the balance is composed of an Fe-based sintered alloy having a composition consisting of Fe and inevitable impurities. In the dispersed particles, for example, Ti carbide is 61 μΩ
・ While they have a specific resistance of cm, they have relatively low specific resistance, so even if they are contained as a dispersed phase, the excellent decrease in conductivity caused by Fe, which is the main constituent of the base material, is caused. Suppressed, and since the hard particles have a high hardness, excellent wear resistance is ensured by this, further intermediate hardness dispersed particles, since the hardness of the intermediate between the base and hard particles, hard dispersed particles Research results show that it exerts the action of mitigating the opponent's attack caused by Is obtained.

[0005]

[Table 1]

The present invention has been made on the basis of the above research results, and as a disperse phase forming component, one or more of the above hard dispersed particles: 5 to 20%,
Similarly, as a disperse phase forming component, one or more of the above intermediate-hardness dispersed particles: 5 to 20%, all of which are one or two of Ni, Cu, and Mn as a matrix forming component. Or more: 0.1 to 7%, and (a) Cr and / or Mo: 0.
05 to 3%, (b) C: 0.05 to 0.5%, containing at least (a) and / or (b), and the balance being Fe and inevitable impurities. The present invention is characterized by a wear-resistant current collecting strip material having excellent electrical conductivity, which is configured.

Next, the reason why the component 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) Hard dispersed particles Since these components have a relatively low specific resistance, it is possible to prevent the conductivity of the siding plate material from being lowered by the inclusion of the components, and to maintain the conductive plate material in a high state, and to have a relatively high hardness. Therefore, the effect of improving wear resistance is remarkable, and therefore, the inclusion of these components makes the siding plate material have high conductivity and excellent wear resistance, but if the content is less than 5%, the desired wear resistance is obtained. The wear resistance cannot be ensured, and on the other hand, if the content exceeds 20%, the strength of the contact plate material will decrease, so the content was defined as 5 to 20%. It should be noted that the content of 7 to 15% is desirable.

(B) Intermediate Hardness Dispersed Particles These components have a relatively low specific resistance as described above, and have an intermediate hardness between the hard dispersed particles and the base material. It has the effect of suppressing the aggressiveness of the opponent while keeping the property high, but if the content is less than 5%, the desired effect cannot be obtained on the other hand, while the content is 2%.
If the content exceeds 0%, the strength will decrease, so the content was defined as 5 to 20%. In addition, it is desirable to
15% content is good.

(C) Ni, Cu, and Mo These components have the function of forming a solid solution in the matrix to strengthen it and improve the adhesion of the hard dispersed particles and the intermediate hardness dispersed particles to the matrix. However, if the content is less than 0.1%, the desired effect on the above-mentioned action cannot be obtained, and if the content exceeds 7%, the toughness decreases, so the content is set to 0. It was set at 1 to 7%. Desirably, the content is 1.5 to 4%.

(D) Cr and Mo These components have the function of forming a solid solution in the base material to further improve the strength and heat resistance thereof, thereby contributing to the improvement of the wear resistance of the ground sheet material. Therefore, it is contained as necessary, but if the content is less than 0.05%, the desired effect on the above-mentioned action cannot be obtained, while the content is 3%.
If it exceeds, the adhesion of the dispersed particles to the substrate will decrease,
As a result, the wear resistance is lowered, so the content thereof is set to 0.05 to 3%. Desirably, the content is 0.3 to 1.5%.

(E) The C component has a function of forming a solid solution in the base material, strengthening it, and improving the sinterability, so it is contained as necessary, but its content is 0. If the content is less than 0.05%, the desired effect cannot be obtained, while if the content exceeds 0.5%, the toughness decreases, so the content is set to 0.05 to 0.5%. I decided. Desirably 0.1 to 0.
3% content is good.

[0012]

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
TaB ₂ having a predetermined average particle size within the range of 150 μm
Powder, NbB ₂ powder, ZrN powder, TaC powder, WC powder, TiSi ₂ powder, WSi ₂ powder, MoSi ₂ powder,
Atomized iron powder having a predetermined grain size of 80 mesh or less, Fe-Cr alloy (Cr: 65% content) powder,
Fe-Mo alloy (Mo: 65% content) powder, and 32
Graphite powder having a particle size of 5 mesh or less was prepared, and these raw material powders were blended to the blending composition shown in Tables 2 and 3, mixed, and then press-molded into a green compact at a pressure of 6 ton / cm ^2. The green compact was placed in an atmosphere of ammonia decomposition gas at 11
By sintering at a predetermined temperature within the range of 30 to 1200 ° C. for 1 hour, the composition has substantially the same composition as the above-mentioned composition, and width: 25 mm × length: 80 mm × thickness: The current collecting contact strip materials 1 to 17 of the present invention having a size of 10 mm
And comparative current collecting strips 1 to 3 were manufactured. It should be noted that the comparative current collecting strip materials 1 to 3 have a composition in which the content of the hard dispersed particles deviates from the range of the present invention to the lower side.

[0013]

[Table 2]

[0014]

[Table 3]

[0015]

[Table 4]

An accelerated wear test was conducted on the various current collecting strips obtained as a result. In the accelerated wear test, an outer diameter of 2.2 m as a simulated trolley wire on the side opposite to the fixed side of a disc having an outer diameter of 2.2 m supported upright by fixing the center to a horizontal rotating shaft of a motor, outer diameter: 2 m x width: 5 mm x thickness: 15 mm hard copper ring (JIS / C1100 / BB-H) 50 mm
Using an eccentrically mounted device, current collecting strips were pressed on both sides of the diameter line of the hard copper ring with a pressing force of 7 kg to make surface contact with the dimension surface of length: 80 mm × width: 25 mm, and the above simulated trolley wire. While passing an electric current of 150 A between the current collecting plate members, the rotation speed of the disk was increased to a rotation speed of 230 km / hr in 5 minutes, and the speed was kept for 5 minutes, and then stopped for 5 minutes to make one cycle, This was repeated three times to measure the specific wear amount of the current collecting strip material and the wear depth of the simulated trolley wire as the mating material. The measurement results are shown in Table 4. In addition, Table 4 also shows the measurement results of the specific resistance of the current collecting strip material for the purpose of evaluating the conductivity.

[0017]

From the results shown in Tables 2 to 4, the current collecting and sliding board materials 1 to 17 of the present invention show a low opponent attacking property and are excellent in high conductivity despite containing hard dispersed particles. While exhibiting wear resistance, comparative current collecting strip materials 1-3
As can be seen from the above, it is apparent that the desired excellent wear resistance cannot be secured when the content ratio of the hard dispersed particles is a low content outside the range of the present invention.
As described above, the current collecting strip material of the present invention has excellent conductivity and wear resistance, and has a low opponent attacking property.
This has industrially useful effects such as being able to fully and satisfactorily respond to the remarkable progress of electric vehicles.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location C22C 38/16 38/50

Claims (4)

[Claims] 1. By weight, as a disperse phase forming component, Ta boride, Nb boride,
One or more of Zr nitride, Ta carbide, and W carbide: 5 to 20%, also one or more of silicides of Ti, W, and Mo as dispersed phase forming components : 5 to 20%, and one or more of Ni, Cu, and Mn as a matrix forming component: 0.1 to 7%, and the rest containing Fe as a matrix forming component and unavoidable impurities A wear-resistant Fe-based sintered alloy pantograph slide plate made of Fe-based sintered alloy having excellent electrical conductivity, which is characterized by being composed of an Fe-based sintered alloy having a composition of 2. By weight, as a disperse phase forming component, Ta boride, Nb boride,
One or more of Zr nitride, Ta carbide, and W carbide: 5 to 20%, also one or more of silicides of Ti, W, and Mo as dispersed phase forming components : 5 to 20%, and all of the following, as a matrix forming component, one or more of Ni, Cu, and Mn:
0.1 to 7%, Cr and / or Mo: 0.05 to 3%,
A wear-resistant Fe-based sintered alloy current collector pantograph sliding plate material having excellent conductivity, characterized in that the remainder is composed of an Fe-based sintered alloy having a composition of Fe and inevitable impurities. 3. By weight, as a disperse phase forming component, Ta boride, Nb boride,
One or more of Zr nitride, Ta carbide, and W carbide: 5 to 20%, also one or more of silicides of Ti, W, and Mo as dispersed phase forming components : 5 to 20%, and all of the following, as a matrix forming component, one or more of Ni, Cu, and Mn:
0.1 to 7%, C: 0.05 to 0.5%, and the balance being composed of a Fe-based sintered alloy having a composition of Fe and unavoidable impurities. Wear-resistant Fe-based sintered alloy pantograph sliding plate for current collection. 4. A boride, Nb boride, as a disperse phase forming component, in% by weight.
One or more of Zr nitride, Ta carbide, and W carbide: 5 to 20%, also one or more of silicides of Ti, W, and Mo as dispersed phase forming components : 5 to 20%, and all of the following, as a matrix forming component, one or more of Ni, Cu, and Mn:
0.1 to 7%, Cr and / or Mo: 0.05 to 3%, C: 0.05 to 0.5%, and a Fe-based firing bond having a composition of the balance Fe and inevitable impurities. A wear-resistant Fe-based sintered alloy pantograph sliding plate material for current collection, which is made of gold and has excellent conductivity.