JPH08100245A - Current collecting pantograph shoe material made of iron-base sintered alloy having wear resistance and excellent in electric conductivity - Google Patents

Abstract

PURPOSE: To provide a current collecting pantograph shoe material made of Fe-base sintered alloy, having wear resistance and excellent in electric conductivity. CONSTITUTION: The current collecting pantograph shoe material is composed of an Fe-base sintered alloy which has a composition consisting of, by weight, 5-20% of TiB2 and/or ZrB2 as dispersed phase forming component, 5-20% of TiSi2 and/or WSi2 also as dispersed phase forming component, 0.1-7% of one or more elements 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), One or two kinds of borides of Ti and Zr (hereinafter, respectively represented by TiB ₂ and ZrB ₂ ) as a dispersed phase forming component: 5 to 20%; Compound (hereinafter referred to as TiS
i ₂ and WSi ₂ ) one or two of:
5 to 20%, all of which are Ni, Ni,
One or more of Cu and Mn: 0.1
.About.7%, and if necessary, (a) Cr
And / or Mo: 0.05 to 3%, (b) C:
0.05-0.5%, above (a) and / or (b)
When it is made of a Fe-based sintered alloy containing Fe and the balance of Fe and unavoidable impurities, TiB ₂ and ZrB ₂ constituting the dispersed phase are the main components of the matrix as shown in Table 1. TiSi, which has a specific resistance almost equal to that of Fe, has extremely high hardness, and also has excellent adhesion to the Fe-based alloy base material, and also constitutes the dispersed phase.
₂ and WSi ₂ have excellent adhesion to the base material and have a relatively low specific resistance, which is higher than that of the Fe component. At this level of specific resistance, TiB ₂ and ZrB ₂ and the high conductivity provided by the base material. Is not hindered and has an intermediate hardness between the above TiB ₂ and ZrB ₂ and the base material, and this intermediate hardness alleviates the opponent attack by the hard TiB ₂ and ZrB _2. The current research results show that not only the current collecting slab material of the present invention has excellent electrical conductivity, but also exhibits low abrasion resistance and excellent abrasion resistance.

[0005]

[Table 1]

The present invention was made based on the above-mentioned research results, and TiB was used as a dispersed phase forming component.
₂ and / or ZrB ₂ : 5 to 20%, also as a dispersed phase forming component, TiSi ₂ and / or WSi ₂ :
5 to 20%, all of which are Ni, Ni,
One or more of Cu and Mn: 0.1
.About.7%, and if necessary, (a) Cr
And / or Mo: 0.05 to 3%, (b) C:
0.05-0.5%, above (a) and / or (b)
The present invention is characterized by a wear-resistant current collecting strip material having excellent conductivity, which is composed of an Fe-based sintered alloy having a composition containing Fe and the balance being Fe and unavoidable 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) TiB ₂ and ZrB _{2 Since} these components have a specific resistance almost equal to that of the Fe component, the inclusion thereof prevents the conductivity of the siding plate material from being lowered and is maintained at a remarkably high state. 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 of the
On the other hand, if the content exceeds 20%, the strength of the ground sheet material will decrease, so the content should be 5-20%.
I decided. It should be noted that the content of 7 to 15% is desirable.

(B) TiSi ₂ and WSi ₂ These components have relatively low resistivity as described above, and have intermediate hardness between TiB ₂ and ZrB ₂ and the base material,
Therefore, it has the effect of suppressing the opponent's aggressiveness while keeping the conductivity of the current collecting strip material high, but its content is 5%.
If it is less than the above range, the desired effect cannot be obtained, and if the content exceeds 20%, the strength tends to decrease. Therefore, the content is defined as 5 to 20%. It should be noted that the content of 7 to 15% is desirable.

(C) Ni, Cu, and Mn These components have the function of forming a solid solution in the matrix to strengthen it and improve the adhesion of the hard particles constituting the dispersed phase to the matrix. When the content is less than 0.1%, the desired effect cannot be obtained, and when the content exceeds 7%, the toughness is deteriorated.
Its content was set to 0.1 to 7%. Preferably 1.5
A content of ~ 4% is preferable.

(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%.
When the content exceeds the range, the adhesion of the hard particles forming the dispersed phase to the base material is deteriorated, and as a result, the wear resistance is deteriorated. Therefore, the content is defined as 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
TiB ₂ powder having an average particle size in the range of 150 μm,
ZrB ₂ powder, TiSi ₂ powder, WSi ₂ powder, Ni powder, Cu powder, and Mn powder, and atomized iron powder having a predetermined particle size of 80 mesh or less, Fe
-Cr alloy (Cr: 65% content) powder, Fe-Mo alloy (Mo: 65% content) powder, and graphite powder having a particle size of 325 mesh or less were prepared, and these raw material powders are shown in Tables 2 and 3. After blending to the blending composition and mixing, 6to
The green compact is press-molded at a pressure of n / cm ² and the green compact is heated to 1130 to 1200 in an ammonia decomposing gas atmosphere.
By sintering at a predetermined temperature within the range of ℃ for 1 hour, the composition has substantially the same composition as the above-mentioned composition, and the dimensions are width: 25 mm × length: 80 mm × thickness: 10 mm. Inventive current collecting strips 1 to 17 and comparative current collecting strips 1 to 3 were manufactured. It should be noted that the comparative current collecting strip materials 1 to 3 are composed of TiB ₂ and Zr constituting the dispersed phase.
The B ₂ content has a composition outside the range of the present invention.

[0014]

[Table 2]

[0015]

[Table 3]

[0016]

[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 6 kg to bring the dimension surfaces of length: 80 mm × width: 25 mm into surface contact, and the simulated trolley wire While passing a current of 200 A between the collector and the current collecting plate material, the rotation speed of the disk was increased to a rotation speed of 270 km / hr in 6 minutes, held at this speed for 3 minutes, and then stopped for 6 minutes as 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.

[0018]

From the results shown in Tables 2 to 4, the current collecting contact strip materials 1 to 17 of the present invention are hard TiB ₂ and ZrB ₂
Although it has a low opponent attacking property despite its inclusion, and exhibits excellent wear resistance while maintaining a high electrical conductivity, it can be seen that in the comparative current collecting plate materials 1 to 3,
It is clear that when the content of B ₂ and / or ZrB ₂ is outside the range of the present invention, the desired excellent wear resistance cannot be ensured. As described above, the current collecting strip material of the present invention has excellent conductivity and wear resistance,
Further, since it has lubricity and has low opponent attack, it has industrially useful effects such as being able to sufficiently and satisfactorily cope with remarkable progress in electric vehicles.

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Claims (4)

[Claims] 1. By weight%, as a dispersed phase forming component, one or two of boride of Ti and Zr: 5 to 20%; also as a dispersed phase forming component, of silicides of Ti and W 1 or 2 kinds: 5 to 20%, and one or more kinds of Ni, Cu, and Mn as a base forming component: 0.1 to 7%, and the rest containing base forming components A wear-resistant Fe-based sintered alloy current-collecting pantograph sliding plate material having excellent conductivity, which is characterized by being composed of an Fe-based sintered alloy having a composition consisting of Fe and unavoidable impurities. 2. One or two kinds of borides of Ti and Zr as a dispersed phase forming component: 5 to 20% by weight, and also a silicide of Ti and W as a dispersed phase forming component. 1 or 2 kinds: 5 to 20%, and any one or more kinds of Ni, Cu, and Mn as a base forming component below:
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. One or two kinds of borides of Ti and Zr as a dispersed phase forming component: 5 to 20% by weight, and also a silicide of Ti and W as a dispersed phase forming component. 1 or 2 kinds: 5 to 20%, and any one or more kinds of Ni, Cu, and Mn as a base forming component below:
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 of boride of Ti and Zr as a disperse phase forming component: 5 to 20%; and a silicide of Ti and W, also as a disperse phase forming component. 1 or 2 kinds: 5 to 20%, and any one or more kinds of Ni, Cu, and Mn as a base forming component below:
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.