JPH08100246A - Current collecting pantograph shoe material made of iron-base sintered alloy impregnated with lead, excellent in electric conductivity and wear resistance - Google Patents

Abstract

PURPOSE: To provide a current collecting pantograph shoe material made of Fe-base sintered alloy impregnated with lead, excellent in electric conductivity and wear resistance. CONSTITUTION: The current collecting pantograph shoe material is formed by impregnating Pb or Pb alloy into an Fe-base sintered alloy which has a composition consisting of, by weight, 5-30% of TiB2 and/or ZrB2 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 and also has 5-15% 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 dispersed phase forming component, one or two kinds of boride of Ti and Zr (hereinafter, respectively represented by TiB ₂ and ZrB ₂ ): 5 to 30%, and below as a base forming component, One or more of Ni, Cu, and Mn: 0.1 to 7%, and (a) Cr and / or Mo:
0.05 to 3%, (b) C: 0.05 to 0.5%, a composition containing the above (a) and / or (b), the balance being Fe and inevitable impurities, and 5 to 15 When a Fe-based sintered alloy having a porosity of 0.1% is used to form a lead-impregnated Fe-based sintered alloy in which Pb or a Pb alloy is impregnated, the TiB ₂ and ZrB ₂ constituting the dispersed phase are shown in Table 1. As shown, it has a specific resistance almost equal to that of Fe, which is the main component of the base material, has a remarkably high hardness, and has excellent adhesion to the Fe-based alloy base material. We have obtained the research results that not only the current collecting strip material has excellent conductivity but also 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 30%, as both the matrix-forming components less, Ni, Cu, and one or more of Mn: 0.1 to 7%, and contains, as further required Accordingly, (a) Cr and / or Mo: 0.
05 to 3%, (b) C: 0.05 to 0.5%, a composition containing the above (a) and / or (b), and the balance of Fe and inevitable impurities, and 5 to 15%. Featuring a current collecting strip material excellent in conductivity and wear resistance, which is composed of an Fe-based sintered alloy having porosity and a lead-impregnated Fe-based sintered alloy impregnated with Pb or Pb alloy. I have.

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 30%, the strength of the ground sheet material will decrease, so the content should be 5-30%.
I decided. It should be noted that the content of 8 to 15% is desirable.

(B) 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.

(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 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%.

(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.

(E) 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, and the excellent lubricity provided by this Pb and Pb alloy is secured. 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.

[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 having a predetermined average particle size within the range of 150 μm
Powder, ZrB ₂ powder, Ni powder, Cu powder, and Mn
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 were prepared, and these raw material powders were compounded in the compounding compositions shown in Tables 2 and 3 and mixed. Then, the green compact is press-molded at a predetermined pressure within the range of 3 to 6 ton / cm ² , and the green compact is kept at a predetermined temperature within the range of 1130 to 1200 ° C. for 1 hour in an atmosphere of ammonia decomposition gas. To form Fe-based sintered alloys A to T having substantially the same composition as the compounding composition and the porosities shown in Tables 2 and 3, and then forming these Fe-based sintered bonds. By impregnating gold A to T with pure lead or a Pb alloy having a composition of Pb-30% Sn as shown in Table 4, width: 25 mm x length: 80 mm x thickness:
The current collecting strips 1 to 17 of the present invention and the comparative current collecting strips 1 to 3 each having a size of 10 mm were manufactured. In addition,
Comparative current collecting strip materials 1 to 3 are TiB ₂ constituting the dispersed phase.
And the ZrB ₂ content is outside the range of the present invention.

[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. 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 then the simulated trolley wire. While passing a current of 200 A between the current collector and the collecting current collector plate, the rotation speed of the disk is increased to a rotation speed of 230 km / hr in 5 minutes, the speed is kept for 4 minutes, and then stopped for 5 minutes as one cycle. This was repeated four 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 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 electrical conductivity and wear resistance, and therefore has industrially useful effects such as being able to sufficiently satisfy the remarkable progress of electric vehicles. To bring.

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Claims (4)

[Claims] 1. By weight%, one or two of boride of Ti and Zr as a dispersed phase forming component: 5 to 30%, and one of Ni, Cu, and Mn as a base forming component. Or a combination of two or more: 0.1 to 7%, and the rest of the composition including Fe and unavoidable impurities as a matrix forming component, 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 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 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 30%, all of which are Ni, Cu and Mn as a base forming component. One or more of them:
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 kinds of borides of Ti and Zr as a dispersed 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%, 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.