JPH0833107A - Current collecting pantograph slider mateiral of copper-infiltrated fe-base sintered alloy with high wear resistance and electric conductivity - Google Patents

Abstract

PURPOSE:To obtain a pantograph slider material having an excellent wear resistance and high resistance efficiency by infiltrating Cu or Cu alloy in Fe-base sintered alloy having a specific porosity for containing a specific quantity of TiB2 and specific quantities of Cu, Ni, Mo as material forming components. CONSTITUTION:Fe-base sintered alloy which contains 5-30wt.% of TiB2 and further 0.5-3wt.% of Cu, 2-6wt.% of Ni and 0.1-2wt.% of Mo as material forming components and the residue of Fe and unavoidable impurity compositions and 10-30% of porosity is prepared. Pure Cu, Cu alloy containing Cu and 3wt.% of Co, or Cu alloy containing Cu, 3wt.% of Fe, l.5wt% of Mo, 1.5wt.% of Zn is infiltrated in the Fe-base alloy at 1135 deg.C in an ammonia decomposed gas atmosphere. Thus, a material which exhibits excellent electric conductivity and excellent wear resistance when used for an electric motor vehicle which travels at a high speed is obtained, and using life can be remarkably prolonged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a collection of a copper-infiltrated Fe-based sintered alloy having excellent electrical conductivity and exhibiting particularly excellent wear resistance when used in an electric vehicle running at high speed. The present invention relates to a pantograph sliding board material for electric use.

[0002]

2. Description of the Related Art A conventional pantograph sliding plate material for an electric vehicle is, for example, Mo: 0.1 to 8.0% by weight, Fe-Mo.
Alloy: 1.0 to 15.0% by weight, optionally Cr: 1.0 to 15.0% by weight, and Cu: 0.1 to 5.0% by weight as a base forming component. %, Ni:
0.1 to 5.0% by weight, C: 0.02 to 0.5% by weight, with the balance being Fe and inevitable impurities,
And F having a Pb impregnation weight ratio of 5 to 30% of pores
It was composed of a lead-impregnated Fe-based sintered alloy obtained by impregnating an e-based sintered alloy with Pb (see JP-A-62-50445).

[0003]

However, in recent years, the speeding up of electric vehicles has been remarkable, and along with this, the pantograph 1
Since the current collection per unit increases, the wear of the contact plate tends to increase remarkably. In addition, the number of pantographs tends to be reduced in order to prevent an increase in noise due to the increase in speed, and this also causes an increase in the abrasion of the contact plate along with an increase in the current collecting current. Furthermore, the increase of the current collection increases the Joule heat due to the contact resistance between the contact plate and the trolley wire, which may cause heating and fusing of the trolley wire.
There has been a demand for a pantograph siding plate material having wear resistance far superior to that of a conventional pantograph siding plate material and having a low resistivity.

[0004]

In view of the above situation, the inventors of the present invention have earnestly studied to obtain a pantograph sliding plate material having excellent wear resistance and low resistivity. b) TiB _2: contains 5 to 30 wt%, as further matrix-forming component, Cu: 0.5 to 3 wt%, Ni: 2 to 6 wt%, Mo: contains 0.1 to 2 wt% , A Fe-based sintered alloy having a composition of balance Fe and unavoidable impurities, porosity: 10 to 30%, Cu
Alternatively, a copper infiltrated Fe-based sintered alloy obtained by infiltrating a Cu alloy,
(B) TiB _2: contains 5 to 30 wt%, as further matrix-forming component, Cu: 0.5 to 3 wt%, Ni:. 2 to
6% by weight, Mo: 0.1 to 2% by weight, Cr: 0.2 to 2
A copper-infiltrated Fe-based sintered alloy obtained by infiltrating Cu or a Cu alloy into a Fe-based sintered alloy having a porosity of 10 to 30% and having a composition containing wt% and the balance being Fe and inevitable impurities, (c) TiB _2: contains 5 to 30 wt%, as further matrix-forming component, Cu: 0.5 to 3 wt%, N
i: 2 to 6% by weight, Mo: 0.1 to 2% by weight, Mn:
Fe having a composition of 0.2 to 2% by weight and the balance of Fe and inevitable impurities Porosity: 10 to 30% Fe
The sintered alloy, copper infiltrated Fe-based sintered alloy obtained by infiltration Cu or Cu alloy, (d) TiB _2: as containing 5 to 30 wt%, still green body forming component, Cu: 0.5 ~ 3
% By weight, Ni: 2-6% by weight, Mo: 0.1-2% by weight, Cr: 0.2-2% by weight, Mn: 0.2-2% by weight
A Fe-based sintered alloy having a porosity of 10 to 30% and containing C and the balance of Fe and unavoidable impurities.
Copper infiltrated Fe-based sintered alloy obtained by infiltration of u or Cu alloy, (e) TiB _2: as containing 5 to 30 wt%, still green body forming component, Cu: 0.5 to 3 wt%, Mo :
0.1-2% by weight, Cr: 0.2-2% by weight, Mn:
Fe having a composition of 0.2 to 2% by weight and the balance of Fe and inevitable impurities Porosity: 10 to 30% Fe
The sintered alloy, copper infiltrated Fe-based sintered alloy obtained by infiltration Cu or Cu alloy, (f) TiB _2: as containing 5 to 30 wt%, still green body forming component, Ni: 2 to 6 % Porosity having a composition containing 0.1% by weight of Mo, 0.1-2% by weight of Cr, 0.2-2% by weight of Cr, 0.2-2% by weight of Mn, and the balance of Fe and inevitable impurities: 10-3
0% of the Fe-based sintered alloy, copper infiltrated Fe-based sintered alloy obtained by infiltration Cu or Cu alloy, (g) TiB _2: 5 to 3
0% by weight, and as a matrix forming component, Cr:
0.2-2% by weight, Mo: 0.1-2% by weight, Mn:
Fe having a composition of 0.2 to 2% by weight and the balance of Fe and inevitable impurities Porosity: 10 to 30% Fe
When a copper-infiltrated Fe-based sintered alloy obtained by infiltrating Cu or a Cu alloy into a base-sintered alloy, or a copper-infiltrated Fe-based sintered alloy of any one of (a) to (g) above, It was found that it is possible to obtain a pantograph sliding plate material for current collection made of a copper-infiltrated Fe-based sintered alloy having excellent wear resistance and excellent electrical conductivity.

The present invention has been made on the basis of such findings, and the reason why the component composition of the Fe-based sintered alloy constituting the pantograph friction plate material is limited as described above will be explained below.

Component A composition (a) Cu The Cu component partly dissolves in Fe to strengthen it,
In addition to forming a strong matrix with Fe, it also has the effect of improving electrical conductivity and arc resistance, but if its content is less than 0.5% by weight, the desired effect cannot be obtained for the above-mentioned action. However, if the content exceeds 3% by weight, the strength of the base material is reduced, so the content is 0.5.
˜3% by weight. A more preferable range is 1.2 to
It is 1.7% by weight.

(B) Ni The Ni component has the function of forming a solid solution with Fe forming the base material to improve the sinterability and strengthen the base material. On the other hand, the desired effect cannot be obtained. On the other hand, if the content exceeds 6% by weight, the solid solution in Fe becomes too large and the austenite structure remains, which makes it difficult to strengthen the matrix. The content was set to 2 to 6% by weight. A more preferable range is 3.5 to
It is 4.5% by weight.

(C) Mo Mo The Mo component has a function of forming a solid solution with Fe of the base material to strengthen the base material and to improve wear resistance and high temperature strength, but if the content is less than 0.1% by weight. The desired effect is not obtained in the above-mentioned action, and on the other hand, even if the content exceeds 2% by weight, the action is not improved, so that the content is 0.1-2.
Weight% is set. A more preferable range is 0.3 to 0.7.
% By weight.

(D) Cr Cr has a function of solid-dissolving in Fe, which is a base forming component, to strengthen and harden the base, and to remarkably improve wear resistance and arc resistance. If the content is less than 2% by weight, the desired effect cannot be obtained, while if the content exceeds 2% by weight, the electrical conductivity tends to decrease, so that the content is 0.2 to 2% by weight. Set to%. A more preferable range is 0.7 to 1.2% by weight.

(E) Mn Mn is added because it has a function of forming a solid solution with Fe of the base material to strengthen the base material and improve wear resistance, but if the content is less than 0.2% by weight, The desired effect cannot be obtained on the other hand. On the other hand, if the content exceeds 2% by weight, a remarkable hardened layer will be formed due to sliding,
Its content was set to 0.2 to 2% by weight. A more preferable range is 0.7 to 1.2% by weight.

(G) TiB ₂ TiB ₂ has a Vickers hardness (Hv) of 3000 to 35.
It has a high hardness of 00 and is dispersed in the base material to have a function of significantly improving the wear resistance and the welding resistance particularly under high speed running. However, if the content is less than 5% by weight, the above-mentioned function is desired. The effect is not obtained, and on the other hand, if the content exceeds 30% by weight, the desired strength cannot be obtained. Therefore, the content is set to 5 to 30% by weight. A more preferable range is 13 to
16% by weight.

B. Porosity If the proportion is less than 10%, the proportion of Cu or Cu alloy infiltrated into the Fe-based sintered alloy is too small, and it is not possible to secure an excellent low resistance brought about by Cu or Cu alloy, On the other hand, if the ratio exceeds 30%, F
Not only the strength of the e-based sintered alloy, that is, the strength of the grounding plate material, is lowered, but also the aggressiveness to the Cu trolley wire, which is the other material, is increased.
Defined as%. A more preferable range of this porosity is 18 to
20%.

When Cu or a Cu alloy is infiltrated into the Fe-based sintered alloy, the electrical conductivity is improved, the arc generation rate is reduced, and the electrical conductivity is also improved as compared with the conventional lead-impregnated ground sheet material. Cu or C infiltrated into this Fe-based sintered alloy
The u alloy is a Cu alloy containing pure Cu, Co: 1 to 5% by weight and the balance of Cu and inevitable impurities, or Fe: 1 to 5% by weight, Mn: 0.5 to 3% by weight, It is preferable that any one of Cu alloys containing Zn: 0.5 to 3% by weight and the balance being Cu and inevitable impurities.

[0014]

[Examples] As raw material powder, water atomized iron powder having a particle size of -80 mesh, electrolytic copper powder having a particle size of -100 mesh,
Particle size: -100 mesh Ni powder, particle size: -200 mesh Cr powder, particle size: -200 mesh Mo powder,
Particle size: -200 mesh FeMn powder, particle size: -20
After preparing 0-mesh TiB ₂ powder, these raw material powders were blended so as to have the component compositions shown in Tables 1 and 2, and the mixture was mixed for 0.5 hours using a double cone mixer.
The green compact is press-molded at a predetermined pressure within the range of 0 to 600 MPa, and the green compact is held in a vacuum atmosphere within the range of 0.01 to 2 torr at a temperature of 1200 to 1250 ° C. for 1 hour. Sintering was performed to produce Fe-based sintered alloys having the porosities shown in Tables 1 and 2.

In this Fe-based sintered alloy, pure Cu, a Cu alloy having a composition of Cu-3 wt% Co, and Cu-3 wt% Fe
A Cu alloy having a composition of -1.5% Mn-1.5% Zn was infiltrated in an atmosphere of ammonia decomposition gas at a temperature of 1135 ° C to obtain a width of 25 mm and a length of 80 mm.
Thickness: Pantograph siding plate material for current collection made of copper infiltrated Fe-based sintered alloy of the present invention having a dimension of 10 mm (hereinafter referred to as siding plate material of the present invention) 1 to 24, and JP-A-62-5044.
Conventional Pb-impregnated Fe-based sintered alloys having the composition described in Japanese Patent No. 5 were used to manufacture pantograph slabs for current collection (hereinafter referred to as conventional slabs).

[0016]

[Table 1]

[0017]

[Table 2]

Next, the resistivities of these contact plates were measured (JIS E6301 pantograph contact plate test methods), and the results are shown in Tables 3 and 4. An accelerated wear test was also conducted. In the accelerated wear test, the outer diameter as a simulated trolley wire was set on one side of a disc with an outer diameter of 2.2 m, which was supported upright by fixing the center to the horizontal rotating shaft of the motor:
A hard copper ring (JIS C1100 BB-H) having dimensions of 2 m, width: 15 mm, and thickness: 5 mm is installed with an eccentricity of 50 mm, and the hard copper ring is attached at two locations along the diameter line. With a pressing force of 44 N, length: 8
0 mm × width: While directing surface contact with the dimension surface of 25 mm, a direct current of 100 V and 100 A is passed between the simulated trolley wire and the ground plate material, and the disk is 260 km / h in 5.5 minutes.
Rotation speed, and after holding at this speed for 5.5 minutes,
It was stopped for 5.5 minutes, and this was set as one cycle, and this cycle was repeated three times to measure the wear weight of the contact strip material and the wear depth of the simulated trolley wire as the mating material. From these measurement results, the specific wear amount of the contact plate material and the value per 5000 revolutions of the simulated trolley wire were calculated and shown in Tables 3 and 4.

[0019]

[Table 3]

[0020]

[Table 4]

[0021]

From the results shown in Tables 3 to 4, all of the siding plate materials 1 to 24 of the present invention show much lower abrasion resistance than the conventional siding plate materials, and are far superior in wear resistance. It is clear that it exhibits electrical conductivity and electrical conductivity. As described above, the copper infiltration Fe-based sintered alloy current collector pantograph siding plate material of the present invention has excellent electrical conductivity, and the siding plate made of this siding plate material is used for high-speed running electric vehicles. If it is present, it exhibits particularly excellent wear resistance and enables further extension of service life.

Claims (9)

[Claims] 1. TiB ₂ : 5 to 30% by weight,
Further, as a matrix-forming component, Cu: 0.5 to 3% by weight, Ni: 2 to 6% by weight, Mo: 0.1 to 2% by weight, and the rest having a composition of Fe and inevitable impurities. Rate: 10-30
% Fe-based sintered alloy, Cu or Cu alloy is infiltrated with copper-infiltrated Fe-based sintered alloy, which is excellent in wear resistance and electrical conductivity Pantograph sliding plate made of base sintered alloy for current collection. 2. TiB ₂ : 5 to 30% by weight,
Further, as a base forming component, Cu: 0.5 to 3% by weight, Ni: 2 to 6% by weight, Mo: 0.1 to 2% by weight, Cr: 0.2 to 2% by weight, and the balance is Porosity having a composition of Fe and inevitable impurities: 10 to 30
% Fe-based sintered alloy, Cu or Cu alloy is infiltrated with copper-infiltrated Fe-based sintered alloy, which is excellent in wear resistance and electrical conductivity Pantograph sliding plate made of base sintered alloy for current collection. 3. TiB ₂ : 5 to 30% by weight,
Further, as a matrix forming component, Cu: 0.5 to 3% by weight, Ni: 2 to 6% by weight, Mo: 0.1 to 2% by weight, Mn: 0.2 to 2% by weight, and the balance is Porosity having a composition of Fe and inevitable impurities: 10 to 30
% Fe-based sintered alloy, Cu or Cu alloy is infiltrated with copper-infiltrated Fe-based sintered alloy, which is excellent in wear resistance and electrical conductivity Pantograph sliding plate made of base sintered alloy for current collection. 4. TiB ₂ : 5 to 30% by weight,
Further, as a matrix forming component, Cu: 0.5 to 3 wt%, Ni: 2 to 6 wt%, Mo: 0.1 to 2 wt%, Cr: 0.2 to 2 wt%, Mn: 0.2 to 2% by weight, with the balance being Fe and inevitable impurities, porosity: 10-30
% Fe-based sintered alloy, Cu or Cu alloy is infiltrated with copper-infiltrated Fe-based sintered alloy, which is excellent in wear resistance and electrical conductivity Pantograph sliding plate made of base sintered alloy for current collection. 5. TiB ₂ : 5 to 30% by weight,
Further, as a matrix forming component, Cu: 0.5 to 3% by weight, Mo: 0.1 to 2% by weight, Cr: 0.2 to 2% by weight, Mn: 0.2 to 2% by weight, Porosity having a composition in which the balance is Fe and inevitable impurities: 10 to 30
% Fe-based sintered alloy, Cu or Cu alloy is infiltrated with copper-infiltrated Fe-based sintered alloy, which is excellent in wear resistance and electrical conductivity Pantograph sliding plate made of base sintered alloy for current collection. 6. TiB ₂ : 5 to 30% by weight,
Further, as a matrix forming component, Ni: 2 to 6% by weight, Mo: 0.1 to 2% by weight, Cr: 0.2 to 2% by weight, Mn: 0.2 to 2% by weight, and the balance is Porosity having a composition of Fe and inevitable impurities: 10 to 30
% Fe-based sintered alloy, Cu or Cu alloy is infiltrated with copper-infiltrated Fe-based sintered alloy, which is excellent in wear resistance and electrical conductivity Pantograph sliding plate made of base sintered alloy for current collection. 7. TiB ₂ : 5 to 30% by weight,
Furthermore, a composition containing Cr: 0.2 to 2% by weight, Mo: 0.1 to 2% by weight, and Mn: 0.2 to 2% by weight as a matrix forming component, with the balance being Fe and inevitable impurities. Porosity possessed: 10 to 30
% Fe-based sintered alloy, Cu or Cu alloy is infiltrated with copper-infiltrated Fe-based sintered alloy, which is excellent in wear resistance and electrical conductivity Pantograph sliding plate made of base sintered alloy for current collection. 8. The Cu alloy to be infiltrated is Co: 1 to 5
Copper infiltration having excellent wear resistance and electrical conductivity according to any one of claims 1 to 7, characterized in that it is made of a Cu alloy having a composition containing wt% and the balance being Cu and inevitable impurities. Pan-graph slab material for current collection made of Fe-based sintered alloy. 9. The Cu alloy to be infiltrated is Fe: 1 to 5
%, Mn: 0.5 to 3% by weight, Zn: 0.5 to 3% by weight, and the balance being a Cu alloy having a composition of Cu and inevitable impurities. A pantograph sliding plate material for current collection made of a copper-infiltrated Fe-based sintered alloy, which is excellent in wear resistance and electric conductivity in any one of 7 above.