JPH08246111A - Zinc-impregnated Fe-Cu based sintered alloy excellent in wear resistance Pantograph sliding plate material for current collection - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a pantograph sliding plate material for current collection of an electric vehicle that exhibits wear resistance particularly at high speed. [Structure] An intermetallic compound of Fe and W: 5 to 15 wt.
And 1 or 2 kinds of intermetallic compounds of Fe and Mo and Si and Cr: 3 to 10% by weight, and further, if necessary, Cr: 3 to 7% by weight. , Cu: 30 to 50 wt% as a matrix forming component, and, if necessary, Sn: 2 to 5 wt% and P:
0.01 to 0.5% by weight, and additionally C:
Zn or Zn alloy is impregnated into a Fe—Cu based sintered alloy containing 0.01 to 0.5% by weight and the balance of Fe and inevitable impurities and having a porosity of 5 to 15%. It is made of zinc-impregnated Fe-Cu based sintered alloy.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art Conventionally, as a pantograph sliding plate material for collecting electricity of an electric car, as described in, for example, Japanese Patent Application Laid-Open No. 62-50445, Mo: 0.1 to 8% by weight and Fe as a dispersed phase. -Mo alloy: 1 to 15% by weight, and further, if necessary, Cr: 1 to 15% by weight. As a base forming component, Cu: 0.1 to 5% by weight, Ni: 0.
1 to 5% by weight, C: 0.02 to 0.5% by weight,
The composition in which the balance is Fe and inevitable impurities, and 5
It is known that an Fe-based sintered alloy having a porosity of ˜15% is composed of a lead-impregnated Fe-based sintered alloy obtained by impregnating Pb or Pb alloy.

[0003]

However, in recent years, the speeding up of electric vehicles has been remarkable, and along with this, the pantograph sliding plate material for current collection is required to have further wear resistance. In practical use, many things, such as pantograph slabs for current collectors made of Fe-based sintered alloys, wear rapidly when the speed of the electric vehicle exceeds 250 km / h,
At present, the service life is reached in a relatively short time.

[0004]

Accordingly, the inventors of the present invention have conducted research to develop a pantograph sliding plate material for current collection that exhibits excellent wear resistance even at high speed running of an electric vehicle. As a result, the pantograph for current collection has been developed. Fe is used as a disperse phase for all of the ground plates.
And an intermetallic compound of W: 5 to 15% by weight, and one or two of an intermetallic compound of Fe and Mo and an intermetallic compound of Fe, Mo, Si and Cr: 3 to 10% by weight. , Further containing Cr: 3 to 7 wt% as necessary,
Each contains Cu: 30 to 50% by weight as a matrix forming component, and further contains Sn: 2 to 5% by weight, P: 0.01 to 0.5% by weight, and further C in addition as necessary. :
0.01 to 0.5% by weight, the balance of which is composed of Fe and inevitable impurities Porosity: 5 to 15%
When the Fe-Cu based sintered alloy of No. 1 is composed of a zinc-impregnated Fe-Cu based sintered alloy obtained by impregnating Zn or a Zn alloy,
The resulting pantograph sliding plate material for current collection is 2
The research results show that even at high speeds of 50 km / h or more, the wear resistance is further improved.

The present invention was made on the basis of the above research results, and the reason why the composition and porosity of the Fe--Cu system sintered alloy constituting the pantograph friction plate material are limited as described above is as follows. Will be explained.

A. Component composition (a) Intermetallic compound The intermetallic compound of Fe and W has a Vickers hardness (Hv) of 5
The intermetallic compound of Fe and Mo and the intermetallic compound of Fe, Mo, Si and Cr have high hardness of 800 to 1300 in Vickers hardness (Hv). The intermetallic compound suppresses the plastic deformation of the base material due to sliding at the surface part just below the sliding surface of the contact plate material, and these crystal form systems are hexagonal when exposed to the sliding surface of the contact plate material. While the crystal form that composes the trolley wire of the mating material is cubic, the mutual adhesion and abrasiveness (abrasiveness) are small, and the oxide film has lubricity in practical use. In combination with the formation of the F, it has the effect of significantly improving the wear resistance in the state where the opponent's aggressiveness is small, especially under high speed running.
If the content of the intermetallic compound of e and W is less than 5% by weight, the desired effect cannot be obtained on the above-mentioned action, while the content thereof is 15
If the content exceeds 5% by weight, the desired strength cannot be obtained. Therefore, the content is set to 5 to 15% by weight. A more preferable range is 7 to 10% by weight. Further, even if the content of one or two of the intermetallic compound of Fe and Mo and the intermetallic compound of Fe, Mo, Si and Cr is less than 3% by weight, the desired effect cannot be obtained in the above action, while Similarly, if the content exceeds 10% by weight, the desired strength cannot be obtained. Therefore, an intermetallic compound of Fe and Mo and Fe and M are obtained.
The content of the intermetallic compound of o, Si, and Cr was set to 3 to 10% by weight. A more preferable range is 5 to 8% by weight.

(B) Cr Cr has a Vickers hardness (Hv) of 160 to 230, is strongly bonded to Fe, and suppresses plastic deformation due to sliding when it is directly below the sliding surface, and wear. Since it has a function of preventing the above, it is contained as necessary, but if the content is less than 3% by weight, the desired effect cannot be obtained in the above function,
On the other hand, when the content exceeds 7% by weight, when exposed on the sliding surface, it exhibits high abrasivity to the mating Cu trolley wire, so the content was set to 3 to 7% by weight. . A more preferable range is 4 to 6% by weight.

(C) Cu The Cu component partially forms a base material together with Fe to strengthen the base material and to improve electric conductivity and arc resistance, but the content thereof is 30% by weight. If the content is less than%, the desired effect cannot be obtained, while the content is 5
If it exceeds 0% by weight, the adhesion with the mating material made of Cu trolley wire will increase, causing a decrease in wear resistance.
Its content was set to 30 to 50% by weight. A more preferable range is 35 to 45% by weight.

(D) Sn The Sn component has a function of forming a solid solution in the base material and strengthening it, so it is contained as necessary, but the content is 2
If it is less than 5% by weight, the desired effect cannot be obtained. On the other hand, if it exceeds 5% by weight, it becomes brittle. Therefore, the content is set to 2 to 5% by weight. A more preferable range is 3 to 4% by weight.

(E) The P P component, together with the Sn component, has a function of forming a solid solution in the matrix to strengthen it and improve the corrosion resistance, so it is contained as necessary, but the content is 0.01 If it is less than wt%, the desired effect cannot be obtained, while if it exceeds 0.5 wt%, it becomes brittle and the electrical conductivity is significantly deteriorated. Was set to 0.01 to 0.5% by weight. A more preferable range is 0.2 to 0.3% by weight.

(F) C The C component is contained as necessary because it has a function of forming a solid solution in the matrix and strengthening it, but its content is 0.0
If it is less than 1% by weight, the desired effect cannot be obtained. On the other hand, if its content exceeds 0.5% by weight, a large amount of pearlite phase is formed on the base material, which makes it extremely hard and the trolley wire of the mating material. The content thereof is set to 0.01 to 0.5% by weight because the wear of the alloy is significantly accelerated. A more preferable range is 0.1 to 0.4% by weight.

B. Porosity If the proportion is less than 5%, the proportion of Zn or Zn alloy impregnated in the Fe—Cu based sintered alloy is too small, and excellent lubricity provided by Zn or Zn alloy cannot be secured. On the other hand, when the ratio exceeds 15%, not only the strength of the Fe—Cu based sintered alloy, that is, the strength of the ground plate material, but also the arc resistance is deteriorated, and the wear is rapidly advanced. Therefore, the ratio is set to 5 to 15%. A more preferable range of this porosity is 7 to 10%.

[0013]

[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
0- + 200 mesh Fe-Mo (Fe-64 wt%
Mo) intermetallic compound powder, particle size: -30 to +200 mesh Fe-Mo-Si-Cr (Fe-40 wt% Mo-
10 wt% Si-3 wt% Cr) intermetallic compound powder, grain size: -60 to +200 mesh Cr powder, grain size: -3
A 50-mesh C powder and a copper phosphorous powder having a particle size of -100 mesh and a P content of 8% by weight were prepared, and these raw material powders were blended to the component composition shown in Table 1 and mixed with a double-cone mixer to give an amount of 0. After mixing for 5 hours, 300 ~ 600M
The green compact is press-molded at a predetermined pressure within the range of Pa, and the green compact 1040 to 1
Fe-Cu system fired bond having a porosity shown in Table 1 and having substantially the same composition as the compounded composition by sintering at a predetermined temperature within the range of 080 ° C for 1 hour. The gold body is formed, and the Fe-Cu based sintered alloy body is also formed in the same manner as shown in Table 1.
Pure Zn or Zn-0.4 wt% C in the combination shown in
A current collector made of the zinc-impregnated Fe-Cu system sintered alloy of the present invention having dimensions of width: 25 mm, length: 80 mm and thickness: 10 mm by impregnating with a Zn alloy of u-0.1 wt% Ti. Pantograph slabs (hereinafter referred to as the zinc-impregnated slabs of the present invention) 1 to 13 for use in manufacturing, respectively, and for the purpose of comparison, as raw material powder, particle size: -30 to +200 mesh F
e-Mo (Mo: 30% by weight content) alloy powder, particle size:-
A 100-mesh Mo powder and a Ni powder were added, and the composition and porosity of the Fe-based sintered alloy body were as shown in Table 1 (corresponding to the composition described in JP-A-62-50445 mentioned above) and A conventional lead-impregnated Fe-based sintered alloy current collecting pantograph friction strip material (hereinafter referred to as conventional lead-impregnation friction material) was manufactured under the same conditions except that the porosity was impregnated with pure Pb.

[0014]

[Table 1]

Next, an accelerated wear test was conducted on these various types of contact plate materials. In the accelerated wear test, the outer diameter supported upright by fixing the center to the horizontal rotating shaft of the motor:
Outer diameter as a simulated trolley wire on one side of a 2.2 m disc:
A hard copper ring (JIS C1100 BB-H) having dimensions of 2 m, width: 15 mm, and thickness: 5 mm is mounted with an eccentricity of 50 mm, and the hard copper ring is attached at two locations on the diameter line. Length of plate: 80mm with pressing force of 40N
× Width: A DC current of 100 V and 200 A is applied 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 270 km / h in 5.5 minutes. 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 6 times. The wear weight of the contact strip material and the simulated trolley wire of the mating material were used. The wear depth was measured. The specific wear amount of the contact plate material was calculated from these measurement results, and the wear depth of the simulated trolley wire was converted into a value per 5000 revolutions and shown in Table 2.

[0016]

[Table 2]

[0017]

From the results shown in Tables 1 and 2, all of the zinc-impregnated siding plate materials 1 to 13 of the present invention showed a low opponent attacking property equivalent to that of the conventional lead-impregnated siding plate materials, and were further improved. It is clear that it exhibits excellent wear resistance.
As described above, the zinc-impregnated Fe-Cu-based sintered alloy current collector pantograph sliding plate material of the present invention is used not only for normal traveling but also for high-speed traveling electric vehicles with a speed of 250 km / h or more. Even in such a case, particularly excellent wear resistance is exhibited, and the service life can be further extended.

Claims (3)

[Claims] 1. An intermetallic compound of Fe and W: 5 to 15% by weight as a dispersed phase, one of an intermetallic compound of Fe and Mo and an intermetallic compound of Fe, Mo, Si and Cr. Or 2 kinds: 3 to 10% by weight, further, as a base forming component, Cu: 30 to 50% by weight, and the balance is composed of Fe and inevitable impurities Porosity: 5 to 15%
Fe-Cu based sintered alloy excellent in wear resistance, characterized in that it is composed of a zinc-impregnated Fe-Cu based sintered alloy obtained by impregnating Zn or Zn alloy into the above Fe-Cu based sintered alloy. A pantograph scraping board made of gold for collecting electricity. 2. An intermetallic compound of Fe and W: 5 to 15% by weight as a dispersed phase, one of an intermetallic compound of Fe and Mo, and an intermetallic compound of Fe, Mo, Si and Cr. Or 2 kinds: 3 to 10% 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, Porosity having a composition of containing and balance of Fe and unavoidable impurities: 5-1
A zinc-impregnated Fe-Cu excellent in wear resistance, characterized by being composed of a zinc-impregnated Fe-Cu-based sintered alloy obtained by impregnating 5% of Fe-Cu-based sintered alloy with Zn or Zn alloy.
A pantograph siding plate made of sintered sintered alloy for current collection. 3. An intermetallic compound of Fe and W: 5 to 15% by weight and Cr: 3 to 7% by weight, as a dispersed phase.
Intermetallic compound of Fe and Mo and Fe, Mo, Si and C
One or two of the intermetallic compounds of r: 3 to 10% by weight, and any of them as a base forming component, Cu: 30 to 50% by weight, Sn: 2 to 5% by weight, P: Porosity having a composition containing 0.01 to 0.5% by weight, C: 0.01 to 0.5% by weight, and the balance of Fe and inevitable impurities: 5-1
A zinc-impregnated Fe-Cu excellent in wear resistance, characterized by being composed of a zinc-impregnated Fe-Cu-based sintered alloy obtained by impregnating 5% of Fe-Cu-based sintered alloy with Zn or Zn alloy.
A pantograph siding plate made of sintered sintered alloy for current collection.