JPH08120424A - Current collecting pantograph shoe material made of iron-base sintered alloy, having wear resistance and excellent in electric conductivity - Google Patents

Abstract

PURPOSE: To produce a current collecting pantograph shoe material made of Fe-base sintered alloy, having wear resistance and excellent in electric conductivity. CONSTITUTION: This current collecting pantograph shoe material is composed of an Fe-base sintered alloy which has a composition consisting of, by weight, 5-20% of one or more kinds among TaB2 , NbB2 , ZrN, TaC, and WC as dispersed phase forming components, 5-20% of one or more kinds among TiSi2 , WSi2 , and MoSi2 , also as dispersed phase forming components, 0.1-5% of one or more kinds among BN, MnS, and MnO2 also as dispersed phase forming components, 0.1-7% of one or more kinds among Ni, Cu, and Mn as matrix forming components, and the balance Fe with inevitable impurities and further containing, if necessary, either or both of 0.05-3% Cr and/or Mo and 0.05-0.5% C.

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%, and also hexagonal boron nitride, manganese sulfide, and oxidation as the dispersed phase forming component. Manganese (hereinafter, BN and Mn, respectively)
S, and MnO _2, which are collectively referred to as “lubrication dispersion particles”) or one or more of them: 0.1
~ 5%, all of which are Ni, C as the matrix forming component
One or more of u and Mn: 0.1
7%, and optionally (a) Cr and / or Mo: 0.05 to 3%, (b) C: 0.
When it is composed of an Fe-based sintered alloy containing 05 to 0.5% or more of (a) and / or (b) and the balance of Fe and unavoidable impurities, as shown in Table 1, Dispersed particles and intermediate hardness dispersed particles have relatively low specific resistance, for example, while Ti carbide has a specific resistance of 61 μΩ · cm. The excellent decrease in conductivity brought about by the constituent Fe is suppressed, and the hard particles have a high hardness, so that excellent wear resistance is ensured. Furthermore, the intermediate hardness dispersed particles are Since it has an intermediate hardness of the hard particles, it exerts an action of mitigating the opponent attack by the hard dispersed particles. Therefore, the resulting current collecting strip material is not only excellent in conductivity but also lubricated. Coupled to have excellent lubricity dispersed particles, with low attacking property, than to give a finding that exhibits excellent wear resistance.

[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 dispersed phase forming component, one or more of the above intermediate hardness dispersed particles: 5 to 20%, and as a dispersed phase forming component, one or more of the above lubricating dispersed particles: 0 1 to 5%, each containing one or more of Ni, Cu, and Mn as a matrix-forming component: 0.1 to 7%, and further, if necessary,
(A) Cr and / or Mo: 0.05 to 3%,
(B) C: 0.05 to 0.5%, above (a) and /
Alternatively, the present invention is characterized by a wear-resistant current collecting strip material having excellent conductivity, which is composed of a Fe-based sintered alloy containing (b) and the balance of Fe and inevitable impurities.

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) Lubricant-dispersed particles All of these components are dispersed in the base material to impart excellent lubricating properties to the sliding plate material, and thus, in the coexistence of the hard dispersed particles and the intermediate-hardness dispersed particles, Although it has a function of contributing to the improvement of the wear resistance of the ground plate material while maintaining a low opponent attack property, if the content is less than 0.1%, the desired effect cannot be obtained for the above-mentioned function, while the content is If the content exceeds 5%, not only the conductivity of the contact strip material is deteriorated, but also the strength is deteriorated. Therefore, the content is defined as 0.1 to 5%. In addition, it is desirable that 1-2.
5% content is good.

(D) Ni, Cu, and Mo These components form a solid solution in the matrix to strengthen it, and at the same time, to improve the adhesion of the hard dispersed particles, the intermediate hardness dispersed particles and the lubricating dispersed particles to the substrate. Has the effect of improving
If the content is less than 0.1%, the desired effect cannot be obtained, while if the content exceeds 7%, the toughness decreases, so the content is set to 0.1 to 7. Defined as%. Desirably, the content is 1.5 to 4%.

(E) Cr and Mo These components have the action of forming a solid solution in the base material to further improve the strength and heat resistance of the base material, 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%.

(F) C The C component has a function of forming a solid solution in the matrix to strengthen it and improve the sinterability, so that it is contained as necessary, but the content thereof 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.

[0013]

EXAMPLES Next, the current collecting strip material of the present invention will be specifically described by way of examples. 15 as raw material powder
TaB ₂ powder, NbB ₂ powder, ZrN powder, TaC powder, WC powder, TiSi ₂ powder, WSi ₂ powder, MoSi ₂ powder, BN powder, MnS having a particle size of 0 μm or less.
Powder, MnO ₂ powder, atomized iron powder having a predetermined particle size of 80 mesh or less, Fe-Cr alloy (C
r: 65% content) powder, Fe-Mo alloy (Mo: 65%)
Powder) and graphite powder having a particle size of 325 mesh or less are prepared, these raw material powders are blended in the compounding compositions shown in Tables 2 to 4, and after mixing, a powder compact is formed at a pressure of 6 ton / cm ^2. By press molding and sintering the green compact in an ammonia decomposing gas atmosphere at a predetermined temperature within a range of 1130 to 1200 ° C. for 1 hour, a component composition substantially the same as the above composition is obtained. Available and width: 25 mm
X Length: 80 mm x Thickness: 10 mm of the present invention collecting strip plates 1 to 17 and comparative collecting strip plates 1 to 3 each having a dimension of 10 mm 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.

[0014]

[Table 2]

[0015]

[Table 3]

[0016]

[Table 4]

[0017]

[Table 5]

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 4 kg to bring the dimension surfaces of length: 80 mm × width: 25 mm into surface contact with the simulated trolley wire While passing a current of 200 A between the current collecting plate members, the rotation speed of the disk was increased to a rotation speed of 250 km / hr in 5 minutes, held at this speed for 5 minutes, and then stopped for 5 minutes to make one cycle, This was repeated 5 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.

[0019]

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 front page (51) Int.Cl. ⁶ Identification number Office 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% Similarly, one or more of hexagonal boron nitride, manganese sulfide, and manganese oxide as a dispersed phase forming component: 0.1 to 5%: Ni, Cu as a base forming component , And one or more of Mn: 0.1 to 7%, and the rest is composed of an Fe-based sintered alloy having a composition of Fe as a matrix forming component and unavoidable impurities. An abrasion-resistant Fe-based sintered alloy pantograph sliding plate material for current collection, which has excellent conductivity. 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%, also as a dispersed phase forming component, one or more of hexagonal boron nitride, manganese sulfide, and manganese oxide: 0.1 to 5%; 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%, also as a dispersed phase forming component, one or more of hexagonal boron nitride, manganese sulfide, and manganese oxide: 0.1 to 5%; 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%, also as a dispersed phase forming component, one or more of hexagonal boron nitride, manganese sulfide, and manganese oxide: 0.1 to 5%; 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.