JPH08104956A - 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 excellent in electrical conductivity and wear resistance by impregnating an Fe-base sintered alloy having a specified compsn. contg. a dispersed phase of TiB2 , ZrB2 , ZrN, MoSi2 or the like and having a specified porosity with Pb. CONSTITUTION: An Fe-base sintered alloy having a compsn. contg., as dispersed phase forming components, by weight, 5 to 20% TiB2 and/or ZrB2 and 5 to 20% one or more kinds selected from among ZrN, MoSi2 , TaC and WC, contg., as matrix forming components, 0.1 to 7% one or more kinds selected from among Ni, Cu and Mn, furthermore contg., at need, 0.05 to 3% Cr and/or Mo, moreover contg. 0.05 to 3% C, and the balance Fe with inevitable impurities and having 5 to 15% porosity is obtd. This alloy is impregnated with Pb or a Pb alloy. By this lead-impregnated Fe-base sintered alloy, the contact strip material for current collecting is constituted. This can show high current collecting capacity over a long period.

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,% related to composition is% by weight).
As a disperse phase forming component, one or two kinds of borides of Ti and Zr (hereinafter, respectively represented by TiB ₂ and ZrB ₂ ): 5 to 20%, also as a disperse phase forming component, Zr Nitride, Mo silicide, Ta carbide, and W carbide (hereinafter, ZrN, MoS, respectively)
i ₂ , TaC, and WC) or two or more kinds thereof: 5 to 20%, and any one or more kinds of Ni, Cu, and Mn as a matrix forming component: 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%.
When the lead-sintered Fe-based sintered alloy obtained by impregnating the base-sintered alloy with Pb or Pb alloy is used, TiB ₂ and ZrB ₂ constituting the dispersed phase of the Fe-based sintered alloy are shown in Table 1. As described above, 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 also has excellent adhesion to the Fe-based alloy base material, and ZrN, which also constitutes the dispersed phase, MoSi ₂ , TaC, and WC have excellent adhesion to the base material, and TiB ₂ , ZrB ₂ , and F
It has a relatively low specific resistance, which is higher than that of the e component, but this specific resistance does not impede the high conductivity provided by TiB ₂ and ZrB ₂ and the base material, and the above-mentioned TiB ₂ and ZrB ₂ has a hardness intermediate between that of the base material and this intermediate hardness alleviates the opponent attack by the hard TiB ₂ and ZrB _2, so that the resulting current collecting strip material has excellent conductivity. In addition to the above, we obtained research results that show low abrasion resistance and 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%, as well dispersed phase forming component, ZrN, MoSi _2, TaC, and one or more of WC: 5 to 20%, as both the matrix-forming component or less , Ni, Cu, and one or more of Mn: 0.1 to 7%,
Further, if necessary, (a) Cr and / or M
o: 0.05 to 3%, (b) C: 0.05 to 0.5
%, The composition containing at least (a) and / or (b), and the balance consisting of Fe and inevitable impurities, and 5 to 15%
Fe-based sintered alloy having a porosity of Pb or Pb
The present invention is characterized by a current collecting strip material which is made of a lead-impregnated Fe-based sintered alloy impregnated with an alloy and has excellent conductivity and wear 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) ZrN, MoSi ₂ , TaC, and WC 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, ZrN powder, MoSi ₂ powder, T
aC powder, WC 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,
Each of the comparative current collecting strips 1 to 3 has a composition in which the contents of TiB ₂ and ZrB ₂ constituting the dispersed phase of the Fe-based sintered alloy are out of 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 to the horizontal rotating shaft of the motor, and was supported upright on the side opposite to the fixed side of a disc having an outer diameter of 2.2 m, and an outer diameter of 2 m as a simulated trolley wire 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 7 kg to make surface contact with the dimension surface of length: 80 mm × width: 25 mm, and the above simulated trolley wire. While passing a current of 150 A between the current collecting plate members, the rotation speed of the disk was increased to a rotation speed of 260 km / hr in 6 minutes, the speed was kept for 5 minutes, and then stopped for 6 minutes to make one cycle, 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.

Continuation of front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display area C22C 33/02 103 G

Claims (4)

[Claims] 1. By weight%, as a dispersed phase forming component, one or two kinds of borides of Ti and Zr: 5 to 20%; also as a dispersed phase forming component, Zr nitride, Mo silicide, One or two of Ta carbide and W carbide
Species or more: 5 to 20%, containing one or more kinds of Ni, Cu, and Mn as a matrix forming component: 0.1 to 7%, and the rest including Fe as a matrix forming component The Fe-based sintered alloy having a composition of inevitable impurities and a porosity of 5 to 15% has 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. By weight%, one or two of borides of Ti and Zr as a dispersed phase forming component: 5 to 20%; Zr nitride, Mo silicide as a dispersed phase forming component; One or two of Ta carbide and W carbide
1 or more of Ni, Cu, and Mn as a matrix-forming component: 1 to 2 or more: 5 to 20%
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. 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, Zr nitride, Mo silicide, One or two of Ta carbide and W carbide
1 or more of Ni, Cu, and Mn as a matrix-forming component: 1 to 2 or more: 5 to 20%
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. In wt%, 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, Zr nitride, Mo silicide, One or two of Ta carbide and W carbide
1 or more of Ni, Cu, and Mn as a matrix-forming component: 1 to 2 or more: 5 to 20%
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.