JPH08104955A - Contact strip material of pantagraph for current collecting made of lead-impregnated iron-base sintered alloy excellent in electrical conductivity and wear resistance - Google Patents

Abstract

PURPOSE: To produce the contact strip material of a pantagraph for current collecting made of a lead-impregnated Fe-base sintered alloy excellent in electrical conductivity and wear resistance. CONSTITUTION: The contact strip material of a pantagraph for current collecting is constituted of a lead-impregnated Fe-base sintered alloy obtd. by impregnating Pb or a Pb alloy into an Fe-base sintered alloy having a compsn. contg., as dispersed phase forming components, by weight, 5 to 20% TiB2 and/or ZrB2 , also contg., as dispersed phase forming components, 5 to 20% TiSi2 and/or WSi2 , contg., as matrix forming components, 0.1 to 7% one or more kinds among Ni, Cu and Mn, moreover contg., at need, 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 and having 5 to 15% porosity.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a lead-impregnated Fe-based calcinated which has excellent conductivity and wear resistance, and therefore exhibits excellent performance over 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 collecting electricity made of bonded gold.

[0002]

2. Description of the Related Art Conventionally, a Pb or Pb alloy has been used as a pantograph sliding plate material for collecting current of an electric vehicle, in general, a Fe-based sintered alloy having a structure in which hard particles are dispersed and distributed in a substrate, and a porosity of 5 to 30%. Various lead-impregnated F impregnated with
An e-based sintered alloy has been proposed and put to practical use.

[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 lead-impregnated Fe-based sintered alloy current collector pantograph siding plates (hereinafter simply referred to as current collecting siding plates) that have been proposed and are in practical use, those with excellent wear resistance have low conductivity, On the other hand, a material having good conductivity has poor wear resistance and does not have both conductivity and wear resistance, so that it is not possible to satisfy these requirements at present.

[0004]

Therefore, the present inventors have
From the above viewpoints, as a result of 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,% relating to composition is% by weight).
As a disperse phase forming component, one or two kinds of boride of Ti and Zr (hereinafter, respectively represented by TiB ₂ and ZrB ₂ ): 5 to 20%; And two kinds of silicides of W and W (hereinafter, respectively represented by TiSi ₂ and WSi ₂ ): 5 to 20%, all of which are one of Ni, Cu, and Mn as a base forming component. Or two or more kinds: 0.1 to 7%, and if necessary,
(A) Cr and / or Mo: 0.05 to 3%,
(B) C: 0.05 to 0.5%, above (a) and /
Alternatively, Fe containing (b) and the balance of Fe and inevitable impurities, and a porosity of 5 to 15%.
Table 1 shows the TiB ₂ and ZrB ₂ constituting the dispersed phase of the Fe-based sintered alloy, when the lead-sintered Fe-based sintered alloy is obtained by impregnating the base-sintered alloy with Pb or Pb alloy. As described above, TiSi ₂ which has a specific resistance almost equal to that of Fe, which is the main component of the base material, and has a remarkably high hardness, and also has excellent adhesion to the Fe-based alloy base material, and which also constitutes the dispersed phase. 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, and at such a specific resistance, TiB ₂ and ZrB ₂ and the high conductivity provided by the base material are obtained. It is not hindered and has an intermediate hardness between the above-mentioned 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 . Current collecting slab material is Te not only becomes the excellent conductivity, a low attacking property, than to give a finding that exhibits excellent wear 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)
A lead-impregnated Fe-based sintered alloy obtained by impregnating Pb or a Pb alloy into an Fe-based sintered alloy having a composition containing Fe and the balance of Fe and unavoidable impurities, and a porosity of 5 to 15%. The present invention is characterized by a current collecting and sliding board material having excellent conductivity and abrasion resistance.

Next, the reason why the component composition and porosity of the Fe-based sintered alloy constituting the current collecting strip material of the present invention are 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.

(F) Porosity If the proportion is less than 5%, the proportion of Pb or Pb alloy impregnated in the Fe-based sintered alloy is too small to secure the excellent lubricity provided by this Pb and Pb alloy. If the percentage exceeds 15%,
Since not only the strength of the Fe-based sintered alloy, that is, the strength of the ground sheet material, but also the arc resistance is deteriorated, the ratio is set to 5 to 15%. Preferably 7
10% is good.

[0013]

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 having a predetermined average particle size within the range of 150 μm
Powder, ZrB ₂ powder, TiSi ₂ powder, WSi ₂ powder,
Ni powder, Cu powder, and Mn powder, atomized iron powder having a predetermined particle size of 80 mesh or less, Fe-Cr alloy (Cr: 65% content) powder, Fe-
Mo alloy powder (containing Mo: 65%) powder and graphite powder having a particle size of 325 mesh or less were prepared, and these raw material powders were compounded in the compounding compositions shown in Tables 2 and 3, and after mixing, 3 to 6 ton / The green compact is press-molded at a predetermined pressure within the range of cm ² , and the green compact is sintered in an ammonia decomposition gas atmosphere at a predetermined temperature within the range of 1130 to 1200 ° C. for 1 hour. To form Fe-based sintered alloys A to T having substantially the same composition as the composition and the porosities shown in Tables 2 and 3, and then to these Fe-based sintered alloys A to T, As shown in Table 4, pure lead or Pb-30% S
By impregnating a Pb alloy having a composition of n,
The current collecting strips 1 to 17 of the present invention and the comparative collecting strips 1 to 3 having the dimensions of width: 25 mm x length: 80 mm x thickness: 10 mm were manufactured. It should be noted that the comparative current collecting plate 1
Nos. 3 to 3 have compositions in which the contents of TiB ₂ and ZrB ₂ constituting the dispersed phase deviate from the range of the present invention to the lower side.

[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 5 kg to make surface contact with the dimension surface of length: 80 mm × width: 25 mm, and the simulated trolley wire While passing a current of 100 A between the current collector and the current collecting plate material, the rotation speed of the disk is increased to 250 km / hr in 5 minutes, and the speed is maintained for 5 minutes. 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.

[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 shows low opponent attacking property despite its inclusion, and shows excellent wear resistance while maintaining high conductivity, as shown in Comparative Current-collecting Scraping Plate Materials 1 to 3, Fe
It is clear that if the TiB ₂ and / or ZrB ₂ constituting the hard phase of the base sintered alloy has a low content outside the scope 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, and has low opponent attack, so that it is possible to satisfactorily deal with remarkable progress of electric vehicles. It brings about a useful effect industrially.

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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 1 or 2 or more kinds of Ni, Cu, and Mn as a base forming component: 0.1 to 7%, and the rest containing the same base forming components. Fe-based sintered alloy having a composition of Fe and unavoidable impurities as a material, and a porosity of 5 to 15%, Pb
Alternatively, a lead-impregnated Fe-based sintered alloy current collecting pantograph sliding plate material excellent in conductivity and wear resistance, characterized by being constituted by a lead-impregnated Fe-based sintered alloy impregnated with a Pb alloy. 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 Fe-based sintered alloy having a composition in which the balance is Fe and inevitable impurities, and a porosity of 5 to 15%, Pb
Alternatively, a lead-impregnated Fe-based sintered alloy current collecting pantograph sliding plate material excellent in conductivity and wear resistance, characterized by being constituted by a lead-impregnated Fe-based sintered alloy impregnated with a Pb alloy. 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:
A Fe-based sintered alloy containing 0.1 to 7%, C: 0.05 to 0.5%, and the balance of Fe and inevitable impurities, and a porosity of 5 to 15%. , Pb
Alternatively, a lead-impregnated Fe-based sintered alloy current collecting pantograph sliding plate material excellent in conductivity and wear resistance, characterized by being constituted by a lead-impregnated Fe-based sintered alloy impregnated with a Pb alloy. 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%, with the balance being Fe and inevitable impurities, and 5 to 15 Fe-based sintered alloy having a porosity of
Alternatively, a lead-impregnated Fe-based sintered alloy current collecting pantograph sliding plate material excellent in conductivity and wear resistance, characterized by being constituted by a lead-impregnated Fe-based sintered alloy impregnated with a Pb alloy.