ceramic hybrid ball bearing
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23-11-2009, 03:13 PM
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Joined: Dec 2008
24-11-2009, 03:33 PM
A Ceramic Hybrid Ball Bearing is a precision bearing in which one or all of its components are made of ceramic elements from silicon nitride. Silicon nitride is a highly processed silica and ceramic material, similar to the heat absorbing, highly resilient tiles on the Space Shuttle. These tiles are used to line the heat shield of the Space Shuttle, as they protect it from the 2500 plus degrees F. extremes of re-entry into the earth's atmosphere. The use of Ceramics for bearing components results in a far superior product over traditional all steel ball bearings.
There are basically three types of Ceramic Ball Bearings;
1. Ceramic Hybrid Ball Bearings : Where the rolling elements, or balls, are ceramic, but the inner and outer rings are still conventional steels.
2. Partial Ceramic Ball Bearings: Where the rolling elements, and the inner ring are ceramic, but the outer ring is still made of steel.
3. Full Ceramic Ball Bearings: Where the rolling elements, inner, and outer rings are made of silicon nitride.
The execellent characteristic of the ceramic ball beraings are :-
Lightweight : As the density of the ceramic ball bearings is 40% lower than that of steel, which allows the centrifugal force from the rolling elements lower, thus extending the life of the bearing.
Low Coefficient of Linear Expansion : In applications involving high speed operation, although the temperature of the bearing is high, this low coefficient results in lower preload and lower heat generation.
Low Friction : The slip of the rolling element during operation is reduced, resulting in less heat being generated.
The use of Ceramics for bearing components results in a far superior product over traditional all steel ball bearings.
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