JPH08109452A - 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 30% TiSi2 and/or WSi2 , contg., as matrix forming components, 0.1 to 7% of one or more kinds among Ni, Cu and Mn, furthermore contg., at heed, 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]

FIELD OF THE INVENTION The present invention provides Fe which has excellent conductivity and wear resistance, and therefore exhibits excellent performance for a long period of time in a state where high current collecting capability is possible. The present invention relates to a pantograph sliding plate material for current collection made of a base sintered alloy.

[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-mentioned viewpoint, as a result of conducting research to develop a current collecting strip material having excellent conductivity and wear resistance, the current collecting strip material is expressed in% by weight (hereinafter,% means% by weight), As a dispersed phase forming component, a silicide of Ti and W (hereinafter,
1 of TiSi ₂ and WSi ₂ respectively)
Species or two types: 5 to 30%, all of which are one or two of Ni, Cu, and Mn as a base forming component.
Or more: 0.1 to 7%, and (a) Cr and / or Mo: 0.05 to 3 if necessary.
%, (B) C: 0.05 to 0.5%, containing the above (a) and / or (b), and the balance being a Fe-based sintered alloy having a composition of Fe and inevitable impurities, The TiSi ₂ and WSi ₂ constituting the dispersed phase are shown in Table 1
As shown in, since it has a low specific resistance similar to that of Fe, which is the main component of the base material, and has a relatively high hardness, and further has excellent adhesion to the Fe-based alloy base material, The result of this study is that the current collecting strip material not only has extremely excellent electrical conductivity but also exhibits excellent wear resistance.

[0005]

[Table 1]

The present invention was made based on the results of the above research, and TiS was used as a dispersed phase forming component.
i ₂ and / or WSi _2: 5 to 30%, or less both as a matrix forming component, Ni, Cu, and one or more of Mn: 0.1 to 7%, containing further required (A) Cr and / or Mo:
0.05 to 3%, (b) C: 0.05 to 0.5%, Fe-based firing bond having a composition containing the above (a) and / or (b), and the balance of Fe and inevitable impurities. The present invention is characterized by a wear-resistant current collecting strip material made of gold and having excellent conductivity.

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) TiSi ₂ and WSi ₂ These components have a low specific resistance close to that of the Fe component, so the inclusion of these components does not reduce the conductivity of the slab material and is maintained at a significantly high state, and the relative Since it is extremely hard, the effect of improving wear resistance is also remarkable. Therefore, the inclusion of these components makes the slab material have high conductivity and excellent wear resistance, but if the content is less than 5%, it is desirable. Wear resistance cannot be ensured, and on the other hand, if the content exceeds 30%, the strength of the contact plate material will decrease, so the content should be 5 to 3
It was set to 0%. It should be noted that the content of 8 to 20% is desirable.

(B) Ni, Cu, and Mn These components act to form a solid solution in the matrix to strengthen it and improve the adhesion of the dispersed phases of TiSi ₂ and WSi _{2 to} the matrix. However, if the content is less than 0.1%, the desired effect is not obtained on the other hand, 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%.

(C) Cr and Mo These components have the function of forming a solid solution in the matrix to further improve the strength and heat resistance of the matrix and thereby contribute 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%.
When the content exceeds 0.05%, the adhesion of TiSi ₂ and WSi _{2 to} the base material is lowered, and as a result, the wear resistance is lowered, so that the content is 0.05 to 3%.
I decided. Desirably, the content is 0.3 to 1.5%.

(D) 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 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.

[0011]

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
TiSi having a predetermined average particle size within the range of 150 μm
₂ powder, WSi ₂ powder, Ni powder, Cu powder, and M
n powder, further atomized iron powder having a predetermined particle size of 80 mesh or less, Fe-Cr alloy (Cr: 65
%) Powder, Fe-Mo alloy (Mo: 65% content) powder, and graphite powder having a particle size of 325 mesh or less, and these raw material powders are blended in the blending composition shown in Tables 2 and 3 and mixed. Then, the green compact is press-molded at a pressure of 6 ton / cm ² , and the green compact is heated to a predetermined temperature within a range of 1130 to 1200 ° C. in an ammonia decomposing gas atmosphere.
By sintering under the condition of holding for a time, it has substantially the same composition as the above-mentioned composition and has a width of 25 mm and a length of 25 mm.
The current collecting strips 1 to 17 of the present invention and the comparative collecting strips 1 to 3 each having a size of 80 mm × thickness: 10 mm were manufactured. The comparative current collecting strip materials 1 to 3 have a composition in which the contents of TiSi ₂ and WSi ₂ constituting the dispersed phase deviate from the range of the present invention to the lower side.

[0012]

[Table 2]

[0013]

[Table 3]

[0014]

[Table 4]

An accelerated wear test was conducted on the various current collecting strips obtained as a result. The accelerated wear test was carried out by fixing the center of the motor to the horizontal axis of rotation of the motor. The disc was supported upright on the side opposite to the fixed side of the disc with an outer diameter of 2.2 m. : 5 mm x thickness: 15 mm
50 hard copper rings (JIS / C1100 / BB-H)
Using a device mounted eccentrically, the current collecting strips are pressed on both sides of the diameter line of the hard copper ring with a pressing force of 5 kg to bring the dimension surface of length: 80 mm × width: 25 mm into surface contact, and then the simulated trolley wire. While passing a current of 100 A between the current collector and the collecting current collector plate, the rotation speed of the disk is increased to a rotation speed of 240 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.

[0016]

From the results shown in Tables 2 to 4, the current collecting contact strip materials 1 to 17 of the present invention are hard TiSi ₂ and WSi.
Despite having a content of ₂ , it has high conductivity and shows excellent wear resistance, while comparative current collecting strip materials 1-3
TiSi ₂ and / or WSi ₂
However, it is clear that if the content is low outside the range of the present invention, the desired excellent wear resistance cannot be secured. As described above, the current collecting rail plate material of the present invention has excellent conductivity and wear resistance, and thus has industrially useful effects such as being able to sufficiently satisfactorily cope with remarkable progress in electric vehicles. It is a thing.

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Claims (4)

[Claims] 1. By weight%, one or two of silicides of Ti and W as a dispersed phase forming component: 5 to 30%, and one of Ni, Cu, and Mn as a base forming component. 1 or 2 or more: 0.1 to 7%, and the balance is made of a Fe-based sintered alloy having a composition of Fe as a matrix forming component and unavoidable impurities. Excellent wear resistance Fe-based sintered alloy pantograph sliding plate material for current collection. 2. One or two kinds of silicides of Ti and W as a disperse phase forming component: 5 to 30%, all of which are Ni, Cu, and Mn as a base forming component. One or more of them:
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%, one or two of silicides of Ti and W as a dispersed phase forming component: 5 to 30%, all of which include Ni, Cu, and Mn as a matrix forming component. One or more of them:
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. One or two kinds of silicides of Ti and W as a dispersed phase forming component: 5 to 30% by weight, all of which are Ni, Cu, and Mn as a base forming component. One or more of them:
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.