JPS6183677A - High antifriction carbon material - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a carbon material with good electrical conductivity and excellent wear resistance.

Conventional technology Carbon materials are made by blending binders such as pitch and tar with coke or graphite, forming them into a predetermined shape, and then firing them.The physical and mechanical properties of the product depend on its use. It varies depending on the binding material used.

Therefore, various efforts have been made to impart desired characteristics. For example, in order to further improve the unique properties of sintered carbon, there is a method of blending aluminum powder with carbon powder (Japanese Patent Publication No. 46-18367), a method of making a composite material with ceramics such as SIC, B, and C (Kyukoken). 1981 Research Lecture #), a method of impregnating a carbon material with a highly conductive metal, and a method of mixing and firing a carbon material with a highly conductive metal (Japanese Patent Publication No. 1982-822) are known. .

Problems to be Solved by this Invention Carbon materials are good conductors of electricity, so they are used as current collecting materials such as various electric pictures, energizing pushbuttons, and pan tag sliders. Gender becomes an issue.

Adding metal is effective in improving the wear resistance of carbon materials. However, even this metal-containing carbon material is not sufficient against contact wire wear and has drawbacks such as causing radio wave interference.

In view of the current situation, the present invention proposes a carbon material that has good tetraelectricity and excellent wear resistance.

Means for Solving the Problems This invention is a carbon material with excellent abrasion resistance, which is obtained by blending 10% by weight or less of yttrium oxide (Y2O2) powder with carbon powder, molding and firing.

Here, carbon powder refers to a product obtained by adding and kneading 1 such as tar pitch or phenol resin to coke or graphite, or a product obtained by polycondensing pitch and having self-sintering properties.

Also, Y mixed with carbon powder, 0. By uniformly dispersing and mixing the carbon particles, the voids between the carbon particles are filled, the bonding force between the particles is improved, and the 1IfftR1 toughness is improved.
The electrical resistance can be reduced and the conductivity can also be improved.

However, the proportion f of Y2O2 is limited to 10% by weight or less because even if a large amount exceeding 6 is added, the effect of improving wear resistance will be saturated and uneconomical.

Examples Example 1 Self-sintering carbon powder obtained from tar pitch 95% by weight
5% by weight of Y2O3 powder was added thereto, and the mixture was ground and mixed in a grinder for 40 minutes to obtain a carbon material. This carbon material was filled into a press mold and press-molded by applying a force of 2 T/cx, then heated to 1000°C, carbonized and fired, and then
Graphitization was maintained at a temperature of 1800-2400'C. The characteristics of the obtained product are those of conventional graphite (conventional example)
A comparison is shown in Table 81.

Table 1 Example 2 By implementing this invention, the amount of addition jXJ of Y and Oi can be reduced by 1%
Using self-sintering carbon powder with a concentration of 12% by weight as raw material, it was molded and sintered in the same manner as in Example 1.

Then, we investigated the characteristics of each product. The results are shown in Table 2. For comparison, a conventional product containing only carbon powder and a product to which carbon powder KSIG or B4C was added were also tested.

The specific wear amount was measured using a rotation tester at a speed of 5.
A rotation test was conducted at Q km/H using a pure copper plate with a smooth surface as the mating material in contact.

(Left below) Figure 1 shows the relationship between the amount of Y and O added and the specific wear amount.
The relationship with the 1t9IC resistance is shown in FIG.

From the above results, the carbon material according to the present invention has a lower specific wear amount and excellent wear resistance than conventional materials, and moreover! It can be seen that the air resistance is low and the conductivity and properties are also better than the conventional ones. It can be seen that is almost saturated. Furthermore, the electrical resistance tends to decrease somewhat as the amount of Y and O added increases, but there is no significant change when the amount is less than 10% by weight.

Effects of the Invention As described above, the present invention has the advantage of adding Y, 0. By adding f#, the abrasiveness can be greatly improved, and when used as a member that is easily worn, such as a current collecting material, its special purpose is significantly increased, and it is extremely useful in practice.

[Brief explanation of drawings]

Figure 1 is a chart showing the relationship between the amount of Y, O, added to carbon powder and the specific wear amount of carbon material, and Figure 2 is a graph showing the relationship between the amount of Y, O, added to carbon powder and the specific wear amount of carbon material. 0. 2 is a chart showing the relationship between the added amount of carbon material and the electrical resistance of the carbon material. Figure 1 d44 Kyo Y2O3's 1st addition (1 Biyama bt staff) Figure 2 ξ

Claims (1)

[Claims] Yttrium oxide (Y_1O) of 10% by weight or less is added to carbon powder.
_3) Carbon material with excellent wear resistance made by blending powder, L-forming, and firing.