JPH0820850A - Pantagraph contact strip material for current collecting made of lead impregnated iron-base sintered alloy excellent in wear resistance - Google Patents

Abstract

PURPOSE:To improve the wear resistance of a pantagraph contact strip material for current collecting by impregnating an Fe-base sintered alloy contg. specified amounts of intermetallic compounds of Fe and W and Cu and Fe and having a specified porosity with Pb (alloy). CONSTITUTION:By weight, 5 to 25% intermetallic compounds of Fe and W are incorporated. As the components of the matrix, the compsn. contg. 30 to 50% Cu, 2 to 5% Sn, 0.01 to 0.5% P, and the balance substantially Fe is formed. An Fe-base sintered alloy having 5 to 15% porosity is impregnated with Pb (alloy) to form a lead-impregnated Fe-base sintered alloy. The intermetallic compounds of Fe and W have high hardness, and the crystal form thereof is made of the hexagonal system. Since a trolley line as the mating material is formed of the cubic system, the mutual coagulating properties and abrasive properties are small to improve its wear resistance. In the case the content of intermetallic compounds is <5%, the desired effect can not be obtd., and in the case of >25%, the desired strength can not be obtd.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lead-impregnated Fe-based sintered alloy current collector pantograph sliding plate material which exhibits particularly excellent wear resistance when used in an electric vehicle running at high speed. .

[0002]

2. Description of the Related Art A conventional pantograph sliding plate material for an electric vehicle has, for example, Mo: 0.1 to 8 as a dispersed phase forming component.
%, Fe-Mo alloy: 1 to 15% by weight, and if necessary, Cr: 1 to 15% by weight, and further, Cu: 0.1 to 5% by weight as a base forming component. ,
Ni: 0.1-5% by weight, C: 0.02-0.5% by weight
A lead-based sintered alloy containing Pb or a Pb alloy, and a Fe-based sintered alloy containing Fe and unavoidable impurities, and having a Pb-impregnated weight ratio of 5 to 30% of porosity. It was composed of gold
-50445).

[0003]

However, in recent years, the speeding up of electric vehicles has been remarkable, and along with this, further wear resistance is required for the pantograph sliding plate material. The scraper made of gold pantograph scraper for current collection has an electric car speed of 250 km / h.
At present, wear progresses rapidly and the service life is reached in a relatively short time.

[0004]

Accordingly, the inventors of the present invention have conducted extensive studies to obtain a pantograph sliding plate material that exhibits excellent wear resistance even at high speed running of an electric vehicle. ) Fe and W intermetallic compound: 5
25% by weight, and as a matrix forming component, C
u: 30 to 50% by weight, the balance being Fe and unavoidable impurities, and a porosity: 5 to 15% Fe-based sintered alloy impregnated with Pb or Pb alloy. If it is made of a base sintered alloy, it is possible to obtain a pantograph sliding plate material for an electric vehicle that has better wear resistance than before. (B) Intermetallic compound of Fe and W: 5
25% by weight, and as a matrix forming component, C
u: 30 to 50% by weight, Sn: 2 to 5% by weight, P: 0.
Fe with a content of 01 to 0.5% by weight and the balance of Fe and unavoidable impurities Porosity: 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, it is possible to obtain a pantograph sliding plate material for an electric vehicle having more excellent wear resistance than before. ) In (a) or (b), by adding Cr: 3 to 7 wt% as a dispersed phase and C: 0.01 to 0.5 wt% to the base forming component of the Fe-based sintered alloy, Fe is added. It was found that the wear resistance does not decrease even if the intermetallic compound of W is reduced to 5 to 15% by weight and contained.

The present invention has been made on the basis of such findings, and (1) An intermetallic compound of Fe and W: 5
.About.25% by weight, and further C
u: 30 to 50% by weight, the balance being Fe and unavoidable impurities, and a porosity: 5 to 15% Fe-based sintered alloy impregnated with Pb or Pb alloy. A lead-impregnated Fe-based sintered alloy made of a base-sintered alloy with excellent wear resistance, a pantograph sliding plate for current collection, (2) Fe-W intermetallic compound: 5 to 25% by weight
And further containing Cu: 30 to 5 as a matrix forming component.
0% by weight, Sn: 2 to 5% by weight, P: 0.01 to 0.5
A lead-impregnated Fe-based sintered alloy obtained by impregnating Pb or a Pb alloy with a Fe-based sintered alloy having a porosity of 5 to 15% and having a composition of Fe and unavoidable impurities. A lead pan impregnated Fe-based sintered alloy having excellent wear resistance, and a pantograph sliding plate for current collection, (3) F
Intermetallic compound of e and W: 5 to 15% by weight and Cr: 3
˜7% by weight, and further as a matrix forming component, C
u: 30 to 50% by weight, C: 0.01 to 0.5% by weight,
A Fe-based sintered alloy having a porosity of 5 to 15% and containing Pb and the balance of Fe and unavoidable impurities.
Alternatively, a pantograph slide plate for current collection made of a lead-impregnated Fe-based sintered alloy excellent in wear resistance, which is composed of a lead-impregnated Fe-based sintered alloy impregnated with a Pb alloy, (4) Fe and W metals Intermetallic compound: 5 to 15% by weight and Cr: 3 to 7% by weight. Further, Cu: 30 to 30% as a base forming component.
50% by weight, Sn: 2-5% by weight, P: 0.01-0.
5% by weight, C: 0.01 to 0.5% by weight, the balance being Fe and unavoidable impurities, and a composition of Fe and unavoidable impurities. And a lead-impregnated Fe-based sintered alloy having excellent wear resistance, which is made of a lead-impregnated Fe-based sintered alloy impregnated with.

[0006] F constituting the pantograph sliding plate material for current collection made of lead-impregnated Fe-based sintered alloy excellent in wear resistance of the present invention
The reason why the component composition and porosity of the e-based sintered alloy are limited as described above will be described.

A. Component composition (a) Intermetallic compound of Fe and W This component has a Vickers hardness (Hv) of 500 to 800.
Has a high hardness, and suppresses the plastic deformation of the base material due to sliding in the surface portion immediately below the sliding surface of the contact plate material, and when it is exposed on the sliding surface of the contact plate material, its crystal While the shape is hexagonal, the crystal form that composes the trolley wire of the mating material is cubic, so mutual adhesion and abrasiveness (abrasiveness) are small, and the lubricity during practical use is low. Combined with the formation of a certain oxide film, it has a function of significantly improving the wear resistance especially in high speed running in a state where the opponent attacking property is small, but if the content is less than 5% by weight, the above-mentioned function is exerted. The desired effect cannot be obtained, and on the other hand, when the content exceeds 25% by weight, the desired strength cannot be obtained. Therefore, the content is set to 5 to 25% by weight. A more preferable range than this range is 10 to 20% by weight.

Further, regarding the intermetallic compound of Fe and W,
By containing 3 to 7% by weight of Cr as a dispersed phase and further containing 0.01 to 0.5% by weight of C as a base forming component to improve the hardness of Fe as a base component,
The content of the intermetallic compound of Fe and W can be reduced to 5 to 15% by weight. The more preferable range in this case is 7
~ 12% by weight.

(B) Cr This component has a Vickers hardness (Hv) of 160 to 230.
It has a hardness of 3 and is firmly bonded to Fe of the base material, and has a function of suppressing plastic deformation due to sliding to prevent wear when it is directly below the sliding surface, but its content is 3% by weight. If it is less than the above range, the desired effect cannot be obtained. On the other hand, if the content exceeds 7% by weight, it is exposed to the sliding surface and it is a counterpart material C.
Since it shows high abrasivity for u-made trolley wire,
Its content was set to 3 to 7% by weight. A more preferable range than this range is 4 to 6% by weight.

(C) Cu The Cu component partially dissolves in Fe to strengthen it,
In addition to forming a strong base with Fe, it also has the effect of improving electrical conductivity and arc resistance, but if its content is less than 30% by weight, the desired effect cannot be obtained for the above-mentioned action. If the content exceeds 50% by weight, the adhesion with the mating Cu trolley wire, which is the mating material, increases, which causes a decrease in wear resistance. Therefore, the content is 30 to 50%.
Weight% is set. A more preferable range is 35 to 45% by weight.

(D) Sn The Sn component has a function of forming a solid solution with Cu forming the matrix and strengthening it, but if the content is less than 2% by weight, a desired effect can be obtained in the above-mentioned function. On the other hand, on the other hand, when the content exceeds 5% by weight, it becomes brittle, so the content was set to 2 to 5% by weight. A more preferable range is
It is 3 to 4% by weight.

(E) P P has a function of forming a solid solution with Cu to strengthen it and improve the corrosion resistance. However, if the content thereof is less than 0.01% by weight, the above-mentioned desired effect is obtained. Not obtained, while
When the content exceeds 0.5% by weight, embrittlement occurs and the electrical conductivity is significantly deteriorated. Therefore, the content is set to 0.01 to 0.5% by weight. A more preferable range is 0.1 to 0.4% by weight.

(F) C C is solid-dissolved in Fe as a base component, and has the action of strengthening and hardening the base, so it is added as necessary.
C: If it is less than 0.01% by weight, the desired effect cannot be obtained. On the other hand, if the content of C exceeds 0.5% by weight, a large amount of pearlite phase is formed and it becomes extremely hard. Since it significantly accelerates the wear of the trolley wire, C:
It was set to 0.02 to 0.4% by weight. A more preferable range is C: 0.1 to 0.4% by weight.

B. 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 Pb or P
The excellent lubricity provided by the b alloy cannot be ensured, while if the proportion exceeds 15%, Fe
Not only the strength of the base sintered alloy, that is, the strength of the ground plate material, but also the arc resistance is deteriorated and the wear is rapidly advanced.
It was set at ~ 15%. A more preferable range of this porosity is
It is 7 to 10%.

[0015]

[Examples] As raw material powder, atomized iron powder having a particle size of -80 mesh, electrolytic copper powder having a particle size of -100 mesh, S
Particle size of n: 10% by weight: atomized bronze powder of -100 mesh, particle size: -60 to +200 mesh of Fe-
W (Fe-75 wt% W) intermetallic compound powder, particle size: -3
50 mesh carbon powder, particle size: -60 to +200 mesh Cr powder, and P: particle size containing 8% by weight: -1
00 mesh copper phosphor powder was prepared, and these raw material powders are shown in Table 1.
300 to 60 after mixing for 0.5 hour using a double cone mixer.
The green compact is press-molded at a predetermined pressure within the range of 0 MPa, and the green compact is heated in an ammonia decomposition gas atmosphere at a temperature of:
Sintering was carried out under the conditions of 1040 to 1080 ° C. and 1 hour holding to produce a Fe-based sintered alloy having the porosity shown in Table 1.

Pure Fe or Pb- is added to this Fe-based sintered alloy.
A lead pan impregnated Fe-based sintered alloy current collector pantograph slide plate of the present invention having dimensions of width: 25 mm, length: 80 mm and thickness: 10 mm by impregnating a Pb alloy having a composition of 30 wt% Sn. (Hereinafter, referred to as the frosted board material of the present invention) 1
13 to 13 and a conventional lead-impregnated Fe-based sintered alloy having the composition described in JP-A-62-50445 (hereinafter, referred to as conventional scraping plate material).

[0017]

[Table 1]

Next, an accelerated wear test was conducted on these ground plate materials. The accelerated wear test is an outer diameter of 2.2 m that is supported upright by fixing the center to the horizontal rotating shaft of the motor.
As a simulated trolley wire on one side of the disk, the outer diameter: 2 m,
A hard copper ring (JIS C1100 BB-H) having a width of 15 mm and a thickness of 5 mm is mounted with an eccentricity of 50 mm, and the hard copper ring is provided with a strip plate 40N at two locations on the diameter line. Pressing force length: 80mm
× Width: A direct current of 100 V and 100 A is passed between the simulated trolley wire and the sliding plate material while bringing the dimension surface of 25 mm into surface contact, and the disk is raised to a rotation speed of 260 km / h in 5.5 minutes. After holding at this speed for 5.5 minutes, 5.5
It was stopped over a period of time, this was set as one cycle, and this cycle was repeated four times to measure the wear weight of the contact plate material and the wear depth of the simulated trolley wire as the mating material. Based on 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 Table 2.

[0019]

[Table 2]

[0020]

From the results shown in Tables 1 and 2, all of the frosted plate materials 1 to 13 of the present invention showed much lower wear resistance as compared with the conventional crushed plate materials, and were much more excellent in wear resistance. It is clear that it exhibits sex. As mentioned above,
The contact plate made of the lead-impregnated Fe-based sintered alloy current collector pantograph contact plate material of the present invention has particularly excellent wear resistance when used not only in ordinary running but also in high-speed running electric vehicles. This makes it possible to further extend the service life.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshio Teraoka 1-5-1, Otemachi, Chiyoda-ku, Tokyo Sanryo Materials Co., Ltd. No. 1 to 4 Tokai Passenger Railway Co., Ltd. (72) Inventor Masaru Iwase 4-1 Gakuendai, Miyashiro-cho, Minami-Saitama-gun, Saitama Nihon Institute of Technology

Claims (4)

[Claims] 1. A composition comprising an intermetallic compound of Fe and W: 5 to 25% by weight, further containing Cu: 30 to 50% by weight as a matrix forming component, and the balance comprising Fe and unavoidable impurities. Porosity to have: 5 to 15%
Of Fe-based sintered alloy having excellent wear resistance, characterized in that the Fe-based sintered alloy of (1) is composed of lead-impregnated Fe-based sintered alloy impregnated with Pb or Pb alloy. Electric pantograph sliding board material. 2. An intermetallic compound of Fe and W: 5 to 25 wt% is contained, and further, as a matrix forming component, Cu: 30 to 50 wt%, Sn: 2 to 5 wt%, P: 0.01 to 0.5% by weight, with the balance being Fe and inevitable impurities, porosity: 5-1
Made of lead-impregnated Fe-based sintered alloy having excellent wear resistance, characterized by being composed of lead-impregnated Fe-based sintered alloy obtained by impregnating Pb or Pb alloy in 5% Fe-based sintered alloy. Pantograph sliding board material for current collection. 3. An intermetallic compound of Fe and W: 5 to 15% by weight and Cr: 3 to 7% by weight, further comprising Cu: 30 to 50% by weight, C: 0.01 to 0.5% by weight, with the balance being Fe and inevitable impurities, porosity: 5-1
Made of lead-impregnated Fe-based sintered alloy having excellent wear resistance, characterized by being composed of lead-impregnated Fe-based sintered alloy obtained by impregnating Pb or Pb alloy in 5% Fe-based sintered alloy. Pantograph sliding board material for current collection. 4. An intermetallic compound of Fe and W: 5 to 15% by weight and Cr: 3 to 7% by weight, and further, as a base forming component, Cu: 30 to 50% by weight, Sn: 2 to 5% by weight. %, P: 0.01 to 0.5% by weight, C: 0.01 to 0.5% by weight, and the balance of Fe and inevitable impurities. Porosity: 5-1
Made of lead-impregnated Fe-based sintered alloy having excellent wear resistance, characterized by being composed of lead-impregnated Fe-based sintered alloy obtained by impregnating Pb or Pb alloy in 5% Fe-based sintered alloy. Pantograph sliding board material for current collection.