JPH08246112A - Contact strip material of pantagraph for collecting current made of zinc-impregnated fe base sintered alloy excellent in wear resistance - Google Patents

Abstract

PURPOSE: To produce the contact strip material of a pantagraph for collecting current made of a zinc-impregnated Fe base sintered alloy excellent in wear resistance and also low in mating attackability. CONSTITUTION: This contact strip material of a pantagraph for collecting current is constituted of a zinc-impregnated Fe base sintered alloy obtd. by impregnating the main body of an Fe-base sintered allay having a compsn. contg., by weight, 1 to 5% TiC as a dispersed phase and constituted of an Fe base allay contg. 15 to 30% Fe-W alloy contg. 60 to 90% W also as a dispersed phapse, and the balance Fe base allay forming the base, in which the Fe base alloy has a compsn. contg. 0.1 to 0.5% C and 1 to 20% W, and the balance Fe with inevitable impurities, and furthermore having 2 to 15% porosity with Zn or a Zn 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-based sintered alloy current collector pantograph slide plate material having excellent wear resistance and low opponent attack.

[0002]

2. Description of the Related Art Conventionally, Pb or Pb alloy, Cu or Cu is generally used in a Fe-based sintered alloy body having a structure in which hard particles are present as a dispersed phase in an Fe-based alloy substrate and a porosity of 2 to 15%. Various types of pantograph slide plates for current collection, which are composed of lead-impregnated and copper-infiltrated Fe-based sintered alloys obtained by impregnating or infiltrating an alloy, have been proposed and put into practical use.

[0003]

On the other hand, the speeding up of electric cars in recent years has been remarkable, and along with this, the pantograph siding plate material for current collection (hereinafter referred to as current collecting siding plate material) has a further higher wear resistance. Although it is required, in the case of current collecting board material,
It is the current situation that if the abrasion resistance is improved, the opponent's aggression is increased, and conversely, if the opponent's aggression is suppressed, a decrease in the abrasion resistance is unavoidable. There is a strong demand for the development of current collecting strips that exhibit excellent properties.

[0004]

Therefore, the present inventors have
From the above viewpoint, without increasing the opponent's aggression,
As a result of conducting research to develop a current collecting strip material having improved wear resistance, the current collecting strip material is expressed in% by weight (hereinafter,% relating to composition indicates% by weight) and titanium carbide (hereinafter , TiC): 1 to 5%, and Fe: W alloy containing W: 60 to 90% as a dispersed phase: 15 to 30
%, And the remainder is a Fe-based alloy forming a base material, and the Fe-based alloy is C: 0.1
0.5%, W: 1 to 20%, and the balance of Fe and inevitable impurities.
When the Fe-based sintered alloy body having a porosity of 15% is made of a zinc-impregnated Fe-based sintered alloy obtained by impregnating Zn or a Zn alloy, TiC constituting the dispersed phase has a Vickers hardness of about 3200. Due to its high hardness, the current collecting strip material has excellent wear resistance, and the Fe-W alloy also constituting the dispersed phase has a Vickers hardness of about 600 to 700. This hardness is a Vickers hardness of the base material, which is an intermediate hardness between the hardness of about 120 and the hardness of the above TiC. Therefore, in addition to acting to alleviate the opponent attack by the above TiC, it itself In coexistence, it contributes to the improvement of wear resistance, and the C and W components which are contained as solid solution in the base material improve the strength of the base material and improve the adhesion of the TiC and Fe-W alloys to the base material, respectively. As a result, research results show that the current collecting strip material has excellent wear resistance in the state of extremely low opponent aggressiveness, in combination with the improvement of lubricity due to Zn or Zn alloy impregnation. It was.

The present invention has been made based on the above-mentioned research results, and TiC: 1 to 5 as a dispersed phase.
%, Similarly as a dispersed phase W: 60 to 90% Fe-
W alloy: 15 to 30%, and the rest is a Fe-based alloy forming a base, and the Fe-based alloy is C: 0.1 to 0.5%, W: 1 to 20
%, And the balance consisting of Fe and inevitable impurities, and a Fe-based sintered alloy body having a porosity of 2 to 15%, which is impregnated with Zn or Zn alloy.
It is characterized by a current collecting strip material made of an e-based sintered alloy.

Next, the reason why the composition and the porosity of the Fe-based sintered alloy body constituting the current collecting strip material of the present invention are limited as described above will be explained. A. Composition (a) TiC The TiC component is dispersed in the substrate as described above and has the effect of significantly improving wear resistance due to its high hardness, but if its content is less than 1%, the desired excellent wear resistance is obtained. However, if the content exceeds 5%, the aggression against the other party will increase. Therefore, the content is 1 to 5%, preferably 1.5 to 3.5%. Specified.

(B) Fe-W alloy The Fe-W alloy component is dispersed in the base material as described above, and Ti
In addition to contributing to the mitigation of opponent attack by the C component, it also contributes to improving wear resistance in the coexistence with the TiC component, but if the content is less than 15%, the desired effect can be obtained in the above action. On the other hand, if the content exceeds 30%, the aggression against the other party will increase. Therefore, the content is set to 15 to 30%, preferably 18 to 25%. Further, the W content of the Fe-W alloy needs to be 60 to 90%, and when the content is less than 60%, the hardness of the steel itself is lowered and the above-described action is satisfactorily exhibited. However, if the content exceeds 90%, the hardness becomes high, which causes the increase of the aggressiveness against the other party, and the content is preferably 70 to 85%.

(C) C component of Fe-based alloy The C component of the Fe-based alloy has a function of forming a solid solution in the substrate to increase strength and, in particular, to improve adhesion of TiC to the substrate. If the content is less than 0.1% in the matrix, the desired effect of improving the above-mentioned action cannot be obtained, while if the content exceeds 0.5%, carbides are formed and Since the toughness decreases, its content is 0.1 to 0.5%, preferably 0.1.
It was set to 5 to 0.35%.

(D) W of Fe-based alloy The W component of the Fe-based alloy, which also constitutes the base material, forms a solid solution in the base material to improve the strength and also improves the adhesion of the Fe-W alloy to the base material. There is an action, but if the content is less than 1% in the matrix, the desired effect is not obtained, while if the content exceeds 20%, the toughness of the matrix decreases. The content was set to 1 to 20%, preferably 1.5 to 10%.

B. Porosity If the porosity is less than 2%, the impregnation ratio of the impregnating material is not sufficient, and as a result, the impregnation effect of melting by friction heat during sliding to improve the lubricity of the friction surface cannot be sufficiently exerted, On the other hand, when the porosity exceeds 15%, the strength rapidly decreases, so the porosity is 5 to 15%, preferably 7-1.
It was set at 3%.

[0011]

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
Has a predetermined average particle size within the range of 150 μm, and 1 to
Various Fe-W alloy powders with a predetermined W content within the range of 95%, and TiC powders, and an average particle size: 150 μm.
Of atomized iron powder and graphite powder of 10 μm are prepared, and these raw material powders are mixed into a predetermined composition and mixed with a V-type mixer for 30 minutes, and then at a predetermined pressure within a range of 3 to 7 ton / cm ^2. The green compact is press-molded, and the green compact is sintered in vacuum at a temperature of 1200 to 1250 ° C. for 80 minutes to have the composition and porosity shown in Tables 1 and 2, and Width 25 mm x thickness: 10 mm x length 8
Fe-based sintered alloy bodies A to T having a size of 0 mm were formed, and then each of these Fe-based sintered alloy bodies A to T was combined with each other as shown in Table 3 in an ammonia decomposing gas atmosphere at 450- The zinc-impregnated Fe of the present invention is obtained by impregnating zinc in a bath of pure Zn or a Zn-0.4% Cu-0.1% Ti alloy heated to a predetermined temperature within the range of 550 ° C. for 1 hour by immersion. Base-sintered alloy current collecting strips (hereinafter referred to as current collecting strips of the present invention) 1 to 14 and comparative zinc-impregnated Fe-based sintered alloy current collecting strips (hereinafter referred to as comparative current-collecting strips) 1 to 6 Were manufactured respectively. In addition, in the comparative current collecting strip materials 1 to 6, the Fe-based sintered alloy body constituting the comparative current collecting strip materials 1 to 6 has a content of components that particularly influence wear resistance and opponent attacking property (see Table 2). (Marked with *) has a composition outside the scope of the present invention.

Next, an accelerated wear test was conducted on the various current collecting strips obtained as a result. The accelerated wear test is
Outer diameter: 2m x width: 5mm x thickness as a simulated trolley wire on the side opposite to the fixed side of a disc with an outer diameter of 2.2m supported upright by fixing the center to the horizontal rotation shaft of the motor. S: 15 mm hard copper ring (JIS / C1100 / BB-
(H) is mounted with an eccentricity of 50 mm, and the above current collecting plate members are pressed on both sides of the diameter line of the above-mentioned hard copper ring with a pressing force of 5.5 kg and length: 80 mm × width: 25 mm contact both sides. 1 between the above simulated trolley wire and the current collecting strip
Rotate the disk in 5 minutes while applying a current of 50A for 2 minutes.
The rotation speed was increased to 00 km / hr, held at this speed for 5.5 minutes, and then stopped for 5.5 minutes as one cycle. This cycle was repeated 6 times. The wear depth of the simulated trolley wire, which is the mating material, was measured. The measurement results are shown in Table 3.

[0013]

[Table 1]

[0014]

[Table 2]

[0015]

[Table 3]

[0016]

From the results shown in Tables 1 to 3, the current collecting and sliding board members 1 to 14 of the present invention all show excellent wear resistance in the state of maintaining low opponent attacking property. As can be seen from the comparative current collecting strip materials 1 to 6, the TiC content and the Fe-content in the Fe-based sintered alloy body constituting them.
It is clear that when the W alloy content, and further the W content in the Fe-W alloy, deviates from the range of the present invention, the wear resistance or opponent attacking property becomes poor. As described above, the current collecting strip material of the present invention has excellent wear resistance and extremely low opponent attacking ability, and can satisfactorily correspond to the speeding up of the electric vehicle and can be used for a long period of time. It exhibits excellent performance.

Claims (1)

[Claims] Claims: 1. By weight%, titanium carbide: 1 to 5% as a dispersed phase, Fe: W alloy containing W: 60 to 90% as a dispersed phase: 15 to 30%; Forming F
The composition has an e-based alloy, and the Fe-based alloy contains C: 0.1 to 0.5%, W: 1 to 20%, and the balance is Fe and inevitable impurities. Zn-impregnated F obtained by impregnating Zn or Zn alloy into a Fe-based sintered alloy body having a porosity of 2 to 15%.
A zinc-impregnated Fe-based sintered alloy current collector pantograph sliding plate material having excellent wear resistance, which is characterized by comprising an e-based sintered alloy.