Graphite bearing graphite material as the foundation, are applied in where
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Graphite bearing graphite material as the foundation, are applied in where
Graphite bearing with graphite as the primary data base, used in industries of food and beverage, textile, chemical etc. in transport, drying machine, textile machine, submersible pump motor bearing, these parts such as grease lubricant will inevitably cause pollution, while the graphite bearing lubricant is very strong, corrosion resistance, and can be for a long time to work without the use of oil. Graphite bearing wear and load, temperature and speed of the square of proportion, when the pressure is 0--0.49MPa, the various materials of graphite bearings can meet the needs of.
In order to improve the mechanical strength of the finished product, especially in order to improve the impact toughness, commonly used in some of the good wear resistance of the metal for impregnation. Antimony impregnated graphite bearing allows the operating temperature up to 500C, antimony and copper on the grinding is not easy to stick, and in the case of large load and rapid operation, its wear resistance can be increased 2--3 times. The strength of graphite material with the temperature to add and add the trend has always maintained to the mercy of 2600C, at high temperature strength is 3 times the room temperature. There are two kinds of conflicts in the sliding bearing, namely, static and dynamic conflict, usually the static conflict of carbon graphite bearing is smaller than that of the metal bearing in the same situation. General carbon graphite bearings in dry conditions, the dynamic coefficient of conflict between 0.08-0.3, wet work case because there is a smooth divide, so the dynamic conflict coefficient is usually within the 0.01-0.1 range.
The carbon brush and the commutator in the conflict, the film appearance can produce a commutator layer of brown, dark purple, light blue, this layer of film can be smooth in the process of maintenance effect. Analysis shows that this layer of film is mainly composed of two parts, one is the metal combined with the metal oxide film and metal hydroxide, known as the oxide film. The second is the graphite bearing carbon film, which contained zooplankton during operation of stripping down carbon block on ultrafine carbon, graphite particles and carbon block in impurities, dust in the air and the adsorbed water and oxygen. It can be seen that the maintenance of the composition of the film can play a very good smooth effect, but also can not be separated from the water and oxygen environment. The sliding bearing has the characteristics of general mechanical parts. In addition to the conflict, wear and heat, but also have a certain degree of mechanical strength.
Although the graphite bearing was impregnated with materials to enhance the mechanical strength, impact resistance, but in the condition of load is large, usually is still not up to the requirements of mechanical strength, and then we start by powder metallurgy method of making bronze graphite bearing.
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