JPH05331472A - Sliding material - Google Patents

Abstract

PURPOSE:To obtain a wear-resistant sliding material usable in an oilless state, having excellent impact resistance. CONSTITUTION:A carbon material or a composite material of carbon and ceramic having 70-120 Shore hardness, >=10kg/mm<2> flexural strength and <=0.2 Darcy air permeability is used as a sliding material. Stable sliding characteristics are obtained for a long period of time in an oilless state. The carbon material or the composite material is widely usable as a wear-resistant sliding material having impact resistance in an oilless state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wear resistant sliding material having excellent impact resistance which can be used without oiling.

[0002]

2. Description of the Related Art Graphite materials, graphite materials impregnated with resin or metal, and plastic materials are used as sliding materials that can be used without oil.

[0003]

The graphite material is an excellent material having chemical resistance, chemical stability and self-lubricating property, but generally, the Shore hardness is 50 and the bending strength is about 5 kg / mm ^2. It is low and has poor wear resistance and impact resistance, which is a major drawback.

A graphite material impregnated with a resin or a metal is also used to compensate for these drawbacks. However, the resin or the metal has a problem in chemical stability, and the sliding characteristics are deteriorated due to deterioration due to long-term use. Has a drawback. In addition, plastic materials have problems in chemical resistance and abrasion resistance, and have the drawback of being deformed.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and provides an abrasion-resistant sliding material capable of compensating for these drawbacks, that is, the gist of the present invention is Shore hardness 70-120, bending strength 10kg / m
It is a sliding material that uses a carbon material or a composite material of carbon and ceramics, which has the characteristics of m ² or more and an air permeability of 0.2 Darcy or less.

If the Shore hardness is 70 or less, the wear resistance is significantly deteriorated. If the bending strength is 10 kg / mm ² or less, there is a high possibility of cracking due to a decrease in impact resistance. Further, when the air permeability is 0.2 Darcy or more, the surface accuracy is deteriorated, and gas or liquid in the atmosphere may enter the material to cause deterioration of the sliding property. When a composite material is used, the ceramics to be added are BN having solid lubricity, Si ₃ N ₄ and Si which can improve wear resistance.
C, B ₄ C and the like are preferable.

Next, examples and operations will be described.

[0008]

[Example 1] Shore hardness 100, bending strength 12 kg / m
Carbon material with m ² and air permeability of 0.1 Darcy.

[0009]

[Example 2] Shore hardness 110, bending strength 10 kg / m
A composite material of carbon and ceramics containing 20% by weight of B ₄ C, which is a carbon material with m ² and a permeability of 0.07 Darcy.

[0010]

[Comparative Example 1] An artificial graphite material having a Shore hardness of 50, a bending strength of 6 kg / mm ² , and an air permeability of 0.3 Darcy.

[0011]

[Comparative Example 2] Shore hardness 60, bending strength 10 kg / mm ² ,
Carbon-metal composite material impregnated with Cu having an air permeability of 0.1 Darcy.

The friction and wear characteristics of Examples 1 and 2 and Comparative Examples 1 and 2 were examined. Test piece size Outer diameter φ25.6 Inner diameter φ20
Counterpart material S45C Sliding speed 1m / sec Surface pressure 1,5,10kg / cm ² Test time 20 hours Wear results are shown in Table 1 and surface pressure 1
Fig. 1 shows the change in friction coefficient at 0 kg / cm ² .

[0013]

[Table 1]

[0014]

As described above, according to the material of the present invention, it is possible to obtain stable sliding characteristics for a long period of time without lubrication.
It can be widely used as an abrasion-resistant sliding material with excellent impact resistance that can be used without lubrication.

[Brief description of drawings]

FIG. 1 is a chart showing a change in a friction coefficient at a surface pressure of 10 kg / cm ² in an example.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI Technical indication C10N 30:00 Z 8217-4H 30:06 40:02 50:08 (72) Inventor Atsushi Nagae Gifu 596 Shimoishi-cho, Toki City, Tochi Prefecture (72) Ichiro Tomatsu, Inventor Ichiro Tomatsu, 8-17, Nogura-cho, Tajimi-shi, Gifu Prefecture (72) Inventor Yoshinari Kato, 1113-2 Terakawa-cho, Mizunami-shi, Gifu Prefecture

Claims (1)

[Claims] Shore hardness 70-120, bending strength 10kg / mm ² or more,
A sliding material that uses a carbon material or a composite material of carbon and ceramics, which has the characteristics of an air permeability of 0.2 Darcy or less.