JPH06279907A - Shoe material made of w-base sintered alloy for current collector for high speed electric vehicle - Google Patents

Abstract

PURPOSE:To provide superior wear resistance in the case of use in electric motor vehicle running at a ultrahigh speed by forming a current collector shoe material by using a W-base sintered alloy containing specific amounts of Ni. CONSTITUTION:The shoe material made of W-base sintered alloy for current collector for high speed electric vehicle is formed by forming a raw material powder mixture, consisting of 3-20wt.% Ni and the balance with inevitable impurities, into a green compact and then sintering it in a hydrogen atmosphere, etc. Because superior heat resistance, oxidation resistance, arc resistance, and further self-lubricity can be secured by means of W as principal component and also strength can be secured by means of Ni forming a binding phase, excellent wear resistance can be provided even in the case of ultrahigh speed running at >=250km an hour.

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 in an ultra-high-speed running of an electric vehicle, as a result, (Hereinafter,% means% by weight), Ni: 3 to 20%, and the remaining W has a composition of W and inevitable impurities.
When composed of a base sintered alloy, the resulting W-based sintered alloy sliding plate material has excellent heat resistance, oxidation resistance, and arc resistance due to W, which is the main component of the W-based sintered alloy constituting the base material. In addition, the self-lubricating property is secured, and the strength is secured by Ni forming the binder phase. Therefore, excellent wear resistance is achieved not only in normal high speed running but also in ultra high speed running of 250 km / h or more. I got the research result that it works.

The present invention was made based on the above research results, and contains Ni: 3 to 20%,
The present invention is characterized by a contact plate material for a current collector of a high-speed electric vehicle, which is composed of a W-based sintered alloy having the composition of the balance W and unavoidable impurities.

In the contact strip material for a current collector of the present invention, the Ni content of the W-based sintered alloy constituting the same is 3 to.
The reason why the content is limited to 20% is that if the content is less than 3%, the desired strength cannot be secured, while the content is 20%.
This is based on the reason that when the content exceeds%, the W content becomes relatively low and the above properties brought about by W are impaired.

[0007]

EXAMPLES Next, the contact plate material for a current collector of the present invention will be specifically described by way of examples. As raw material powders, W powder and N powder each having a particle size of -100 mesh or less
i powder was prepared, and these raw material powders were blended to the blending composition shown in Table 1 and mixed for 2 hours in a V-type mixer, and then 2 to
By press forming into a green compact at a pressure of n / cm ² and sintering the green compact in a hydrogen atmosphere at 1460 ° C. for 2 hours, W having substantially the same composition as the compounded composition is obtained. The W-based sintered alloy strips 1 to 7 of the present invention each made of a base sintered alloy and each having dimensions of width: 25 mm x length: 80 mm x thickness: 10 mm were 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.

[0009]

[Table 1]

Then, an accelerated wear test was carried out on each of these various 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 50mm eccentricity attached to the above hard copper ring with a pressing force of 6kg on both sides of the diameter line, and a dimension surface of length: 80mm × width: 25mm. While making a surface contact and passing a current of 200 A between the simulated trolley wire and the ground plate material, the rotation speed of the disk was increased to a rotation speed of 270 km / hr in 5 minutes, and this speed was maintained for 5 minutes, followed by 5 minutes. Stopping was set as one cycle, and this was repeated three times to measure the specific wear amount of the contact plate material and the wear depth of the simulated trolley wire as the mating material. These measurement results were converted into values for simulated trolley wire: 5000 revolutions, and are also shown in Table 1 as the average value of the two ground plate materials.

[0011]

From the results shown in Table 1, all of the W-based sintered alloy strips 1 to 7 of the present invention are relatively high-speed running and are relatively higher than the conventional Fe-based sintered alloy strips. It is clear that it shows low wear resistance against opponents and shows much better wear resistance than this. As described above, the W for the current collector of the present invention
The sinter plate made of base sintered alloy exhibits excellent wear resistance not only when used for normal running but also when used for an electric vehicle that runs at an ultra-high speed of 250 km / h or more, and is sufficiently satisfactory. is there.

Claims (1)

[Claims] 1. A current collector for a high-speed electric vehicle, characterized in that it is made of a W-based sintered alloy containing Ni: 3 to 20% by weight and the balance being W and inevitable impurities. W-based sintered alloy sliding plate material for equipment.