JPS6026072B2 - Carbon-based wear-resistant material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wear-resistant material obtained by sintering a binder of organic silicon and graphite such as tar or coke, metal, or a combination thereof.

Conventionally, wear-resistant materials have been made by blending graphite as a main component with a binder, kneading, molding, and firing, but the wear resistance is maintained even under high temperature and high pressure, and it has good chemical resistance and oxidation resistance. Therefore, it has been used for wear-resistant lubricating parts, grinding abrasives, sliding parts, electrical parts, electrodes, and other applications.
However, there are many types of graphite, both natural and man-made.
There are also man-made products that use coke, pitch coke, or tar coke obtained from petroleum or coal as raw materials, and the graphitization obtained changes depending on the raw material, making it difficult to obtain the desired quality. In particular, products that have good high-temperature lubricity and pressure resistance, maintain stable wear resistance under high-temperature and high-pressure conditions, and can control coefficients as needed are not yet available to meet demand. . In view of the current state of the prior art, the present invention provides a composition in which an organosilicon compound or a mixture thereof with tar, a graphite-containing material such as coke or a mixture thereof, and a mixture of metal powder pieces. Knead things well and form them,
The object of the present invention is to provide a bonito-resistant material that is bonded and composited at high temperatures, has good solid lubricity even under high temperature and high pressure, has high wear resistance, and can control the coefficient of friction.

Next, an outline of the present invention will be explained.

In the present invention, coke and tar are added to an organic silicon compound, for example, two polymers of polydimethylsilane fSi (CH3), and the mixture is thoroughly mulled and sintered to form a base compound, which is sintered. Very uniformly distributed throughout the body
A dispersed composite material is obtained. The base material becomes graphite, and the above-mentioned carbonized carbide and base material are dispersed and mixed together, resulting in an extremely strong carbonized carbide base material and graphite combined. As an organic silicon compound, (CH3S
iHC12); [(C6 melon)2SIC12]; [(C is)2SIC12]: [(CH3)3SiSi(CH3)
3]: [Si(CH3)4]: [(CH3)2Sj]6
etc.

According to the present invention, a composite material can be obtained by the formation of a compound of poppy, elementary carbon, and graphitization, and by controlling the formation of these, a composite material with a controlled friction coefficient can be obtained. Furthermore, it is possible to change the strength of the composite material by controlling the amount of carbonized poppy and element produced by changing the amount of the organic silicon compound added. A strong bond with extremely good carbonization and uniform dispersion of elements has high wear resistance under high temperature and high pressure, and can be effectively used as a brake material. Those with high wear resistance are suitable for oil seal materials, and those with a low coefficient of friction are effective for use in sliding parts or bearing parts. In both cases, the results of their use confirmed that they had very significant effects. Next, the present invention will be described using tetra ethyl silicate (hereinafter referred to as TES) as an example.

TES has the following structural formula, poppy, 28. Includes box weight percent.

Blend example (% by weight) TES 15% Tar 6% Petroleum coke Remaining part The above formulations were mixed, kneaded at 120 qo for 3 hours, then molded in a graphite mold, and then subjected to electric discharge solidification.

The molding pressure used was 500 to 1500k9/piece, in the case of hot pressing, 500 to 1000k9/piece at 50 to 150°C, and in the case of lining pressure, 1000 to 1500k9/piece. The dawning temperature is initially solidified by generating hydrocarbon gas at below 500 pm, then primary firing for graphitization at 800 to 100 pm, and then raised to 2500 to 300 pm by electric discharge. This prevents deformation and oxidation loss due to heating during that time. The fired product thus obtained has a maximum friction coefficient of 3.5 to
5. The stop pressure was 2.5 snow/me.

For comparison, when the blending amount of TES is 3% or less and a normal thermosetting resin is used instead, the friction coefficient is 0.
．． 06 to 0.1 with a large amount of carbonized poppy and millet, compared to the case with 4.0, there was a very noticeable change.

In this way, when the amount of added TES is increased and the amount of graphite (graphite) is relatively decreased, the strength and hardness increase, the friction resistance increases, and it can be used for brake materials, oil seal materials, etc. Furthermore, by reducing the amount of TES, a product with appropriate hardness and friction resistance can be manufactured and used for bearings. However, when the amount of TES mixed is reduced to 3%, the withstand pressure increases to 40%.
Since it is less than 0 to 500k9/clump, the minimum limit is about 3%. In any of the above cases, strength, hardness, and abrasion resistance are maintained even under high temperature and high pressure, so they are suitable for use. It is an important effect that a desired friction coefficient can be obtained relatively easily by controlling the frictional resistance and strength as described above by changing the amount of TES added. This is one of the remarkable effects of As already mentioned, the striated composite material of the present invention, which is a mixture of the organosilicon compound or a mixture of the same and the binder tar, and coke or graphite (graphite) has good wear resistance. A part of the blended amount is substituted with metal and used to bind the metallic carbon silicon carbide composite.

As the metal, powder or pieces of copper, aluminum, lead, tin, zinc, nickel, silver, tungsten, tungsten car/ite, chromium, zirconium, yttrium, etc. are used. Mix metal, such as copper powder, with tar, knead the well-mixed mixture at 15 mm for 1 hour, add an appropriate amount of oxide remover if necessary, put it into the end of a specified mold, and process. It is pressed and compression molded, and then fired at a suitable temperature of 1000°C or less. In the case of the above-mentioned combination example where TES is 15% and the total amount of tar and petroleum coke is 79%, the tar is T
Used for addition and kneading of ES and coke, carbonized poppy,
In addition to the amount of graphite (graphite) required for the production of the base, graphite was fired in the base, but when adding metals such as copper powder, as a blending example, TES 15%, tar 6-10%, copper powder 0-40% %, the remainder includes things like petroleum coke.

If the amount of copper powder added is increased, the amount of tar added can be reduced because copper acts as a binder. If the fired compact is to be used at high temperatures, the amount of copper added should be reduced to an appropriate amount or not added. When metal is added, the thermal conductivity and electrical conductivity improve, so it is suitable for dust-resistant electrical conductors, grinding electrodes, etc. When used in bearings,
To maintain strength, hardness, and coefficient of friction suitable for usage conditions, and at the same time to obtain a sintered body or a scale body having electrical conductivity that has appropriate high temperature and high pressure properties. As already explained, the shaped sintered body of the organosilicon compound, metal, and graphite of the present invention is carbonized in the compact, uniformly dispersing the elements, and has wear resistance under high temperature and high pressure. death,
It also has extremely high strength and hardness.

Claims (1)

[Claims] 1. Wear-resistant materials used for parts that require wear resistance in sliding, bearing lubrication, friction, grinding, machining, etc., include organic silicon compounds or organic silicon compounds mixed with tar, coke, graphite, and other graphitized materials. It is characterized by mixing a carbon-containing substance and metal powder particles, kneading the mixed composition, and then sintering it to generate and distribute silicon carbide in a graphitized sintered body. Carbon-based wear-resistant material.