JPH06287673A - Shoe material made of w-base sintered alloy for current collector in rapid transit electric motor vehicle - Google Patents

Abstract

PURPOSE:To obtain a shoe material made of W-base sintered alloy, hardly causing damage to a trolley wire as a mating material when used for current collector in rapid transit electric motor vehicle and having excellent wear resistance. CONSTITUTION:This shoe material for current collector in rapid transit electric motor vehicle is constituted of a W-base sintered alloy which has a composition consisting of, by weight, 3-20% of one or >=2 kinds among iron group metals, 0.5-10% Mo, and the balance W with inevitable impurities and further containing, if necessary, 0.5-10% Cu.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a W-based sintered alloy siding plate material having excellent wear resistance when used in a current collector such as a pantograph of an electric vehicle running at a high speed. .

[0002]

2. Description of the Related Art For a long time until now,
It is well known that various types of Fe-based sintered alloys are predominantly used as the scraping plate material for the current collector of the electric car.

[0003]

On the other hand, in recent years, electric vehicles have tended to become faster and faster, and now commercial operation at an hourly speed of 270 km has become a reality, and even commercial operation at an ultra-high speed of 300 kmh or more has become possible. Although it is planned, in the above conventional Fe-based sintered alloy siding plate material, when used for ultra-high speed running, the present situation is that wear progresses extremely rapidly.

[0004]

Therefore, the present inventors have
From the above viewpoints, as a result of research to develop a current collector siding plate material that exhibits excellent wear resistance even at ultra-high speed running of an electric vehicle, as a result, (Hereinafter,% means% by weight), Co, Ni, and Fe
One or more of (hereinafter referred to as iron group metal): 3 to 20%, Mo: 0.5 to 10%, and, if necessary, Cu: 0.5 to 10% Contains,
When the rest is composed of a W-based sintered alloy having a composition consisting of W and inevitable impurities, the resulting W-based sintered alloy siding plate material is excellent due to W which is the main component of the W-based sintered alloy constituting the same. C which secures heat resistance, oxidation resistance, arc resistance and self-lubricating property and forms a binder phase.
The strength and heat resistance are secured by one or more of o, Ni, and Fe and Mo, and the strength is further improved by the solid solution of Cu. We obtained the results of research that shows excellent wear resistance even at ultra-high speeds.

The present invention has been made based on the above research results, and one or more of iron group metals: 3
.About.20%, Mo: 0.5 to 10%, and, if necessary, Cu: 0.5 to 10%, with the balance being W and unavoidable impurities. The present invention is characterized by a contact plate material for a current collector of a high-speed electric vehicle, which is made of bonded metal.

Next, the reason why the component composition of the W-based sintered alloy constituting the siding plate material for a current collector of the present invention is limited as described above will be explained. (A) Iron group metal These components have the action of forming a binder phase to improve the strength of the ground sheet material, but if the content is less than 3%, the desired strength cannot be secured, On the other hand, if the content exceeds 20%, the W content becomes relatively low, and
Since the above-mentioned characteristics brought about by the components are deteriorated, the content thereof is set to 3 to 20%.

(B) Mo Mo The Mo component has an action of forming a solid solution with an iron group metal to improve the strength and heat resistance of the siding plate material, but if its content is less than 0.5%, it is desirable for the above action. However, if the content exceeds 10%, it becomes difficult to form a complete solid solution in the binder phase at normal sintering temperature, and Mo becomes present at the grain boundaries, which reduces the strength. Therefore, the content is determined to be 0.5 to 10%.

(C) Cu The Cu component has a function of forming a solid solution in a solid solution of an iron group metal and Mo forming a binder phase to further improve the strength, so that it is contained if necessary. Its content is 0.
If it is less than 5%, the desired strength-improving effect cannot be obtained. On the other hand, if its content exceeds 10%, the W content becomes relatively low and the above properties brought about by W are impaired. Therefore, the content was determined to be 0.5 to 10%.

[0009]

EXAMPLES Next, the contact plate material for a current collector of the present invention will be specifically described by way of examples. W powders, Co powders, Ni powders, iron powders, Mo powders, and Cu powders each having a particle size of -100 mesh or less were prepared as raw material powders, and these raw material powders were made to have the composition shown in Tables 1 and 2. Blend and mix for 2 hours in a V-type mixer, then 2 ton / cm ²
W having a composition substantially the same as the compounded composition by press-molding into a green compact at a pressure of 1, and sintering the green compact in a hydrogen atmosphere at a temperature of 1300 to 1560 ° C. for 2 hours. Composed of base sintered alloy, and each width: 2
Each of the W-based sintered alloy strips 1 to 23 of the present invention having dimensions of 5 mm x length: 80 mm x thickness: 10 mm was produced.

For the purpose of comparison, Fe-Mo having a particle size of -100 mesh or less is used as a raw material powder.
Alloy (Mo: 60% content) powder, Ni powder, Cu powder,
Fe powder, iron powder, and carbon black were used.
1%, C: 0.1%, Fe: The balance is mixed, and the mixture is mixed for 2 hours in a V-type mixer, and then pressed into a green compact at a pressure of 6 ton / cm ^2. Is sintered in an ammonia decomposition gas atmosphere at 1130 ° C. for 1 hour, and the composition is substantially the same as the compounding composition, and a structure in which hard Fe—Mo alloy particles are uniformly dispersed and distributed in the Fe-based alloy substrate. Composed of a Fe-based sintered alloy having
Moreover, a conventional Fe-based sintered alloy strip material having the same dimensions of width: 25 mm x length: 80 mm x thickness: 10 mm was produced.
Note that the conventional Fe-based sintered alloy siding plate material is a typical one of the shaving plate materials that are currently widely used as a pantograph sliding plate material for electric vehicles.

[0011]

[Table 1]

[0012]

[Table 2]

Next, an accelerated wear test was conducted on these various types of contact plate materials. In the accelerated wear test, the center is fixed to the horizontal rotation shaft of the motor, and it is supported upright on one side of a disc with an outer diameter of 2.2 m. As a simulated trolley wire, the outer diameter is 2 m, the height is 15 mm, and the width is 15 mm. : 5mm hard copper ring (JI
S ・ C1100 ・ BB-H) with a 50 mm eccentric attachment, and using the above-mentioned hard copper ring on both sides of the diameter line with a pressing force of 7 kg, a dimension surface of length: 80 mm × width: 25 mm While making a surface contact and flowing a current of 150 A between the simulated trolley wire and the ground plate material, the rotation of the disk was increased to a rotation speed of 300 km / hr in 5 minutes and kept at this speed for 5 minutes, followed by 5 minutes. Stopping was set as one cycle, and this was repeated four times to measure the specific wear amount of the contact strip material and the wear depth of the simulated trolley wire as the mating material. These measurement results were converted into values per simulated trolley wire: 5000 revolutions, and the average values of the two contact plates were given in Tables 1 and 2.
Are also shown.

[0014]

From the results shown in Tables 1 and 2, the present invention W
All of the base sintered alloy-made siding plates 1 to 23 have a relatively low opponent attack compared to the conventional Fe-based sintered alloy siding-plates at ultra-high speed running, and show further excellent wear resistance. It is clear. As described above, the W-based sintered alloy siding plate material for a current collector of the present invention has excellent durability when used not only in normal running but also in an electric vehicle running at an ultrahigh speed of 250 km / h or more. It exhibits abrasion resistance and can be sufficiently satisfied.

Claims (2)

[Claims] 1. One or more of Co, Ni, and Fe in wt%:
3 to 20%, Mo: 0.5 to 10%, and the remainder being composed of a W-based sintered alloy having a composition consisting of W and inevitable impurities. W-based sintered alloy friction plate material. 2. One or more of Co, Ni, and Fe, in wt%:
3 to 20%, Mo: 0.5 to 10%, Cu: 0.5 to 10%, and the rest is composed of a W-based sintered alloy having a composition of W and inevitable impurities. Soil plate material made of W-based sintered alloy for current collector of high speed electric car.