Carbon Bush Benefits
At high temperatures, plastic and composite bearings are subject to other problems such as softening Melting, deformation and may extrude out of the beating area all together. Because the carbon graphite Matrix is very strong. It is not subject to the deformation, melting, or even softening that can occur with Plastic bearings at these elevated temperatures.
Advantages of using Carbon Bushes in Submersible Motors
Helps the pump to run in dry condition.
Low generation of heat due to self lubricating property.
When carbon is used as material for sliding purpose, there is no generation of heat in that area due to excellent self lubrication available from carbon. This helps to improve the lire of thrust bearings as well as other parts of the pump which may be damaged due to high temperature
Contributes in saving of power.
As the electricity goes costlier day by day, carbon is the best solution for decreasing running cost of the pump.
Runs with low input power as compared to ferro asbestos/teflon.
As ferro asbestos is a breaking materials, it cause friction between the thrust pad and bearing resulting in higher requirements of power where as the carbon causes a free movement and the pump starts & runs with minimum energy.
The motor with carbon thrust bearing and bush does not seize even after prolonged test.
Even if the pump is not in use for a long period, the pump with carbon bearing starts immediately with the supply of power
The low hp pump with carbon provides same output as high hp pump with ferro asbesotos, tefion or nylon.
Due to excellent self lubricating properties of carbon there is no friction between the thrust pad and bearing and as result there is no energy loss and so the pump gives the maximum output
The pump with carbon bearing starts at lower voltage compared to the pump with ferro asbestos or other bearing materials which require higher voltage to start.
The pump with carbon bearing starts at lower voltage compared to the pump with ferro asbestos or other bearing materials which require higher voltage to start.
Operating Temperature
The temperature resistance in an oxidizing atmosphere can be specified as 400℃ maximum for G10 bearing qualities. In a non-oxidizing atmosphere the temperature resistance is determined by the final graphitizing treatment of each individual grade (e.g. upper application limit for graphite is approximately 3000℃). Temperature resistance is also affected by various impregnations. In the case of resin impregnation the maximum operating temperature is 180℃ for lead impregnation 200 C and antimony impregnation 500℃.
Frictional Behavior
Carbon-Graphite has self-lubricating properties because of its crystalline structure. The low friction coefficient is a function of the low bonding between the structural lattice planes. Dislocation of one against the other is therefore easy. The friction coefficient is particularly low if traces of water or other vapors are present. The friction coefficient is greatly increased when a vacuum is created. Because of the varying conditions of application, no exact data can be given for friction coefficients. In general the following values can be expected for sliding friction:
- Dry friction 0.10...0.30
- Mixed friction 0.05…0.10
- Hydraulic friction 0.01...0.05