04-01-2013, 10:37 AM
Hybrid Bearings
Hybrid Bearings[.ppt (Size: 454 KB / Downloads: 83)
Introduction
Ceramic materials are inorganic, non-metallic materials made from compounds of a metal and a non metal. Ceramic materials may be crystalline or partly crystalline. They are formed by the action of heat and subsequent cooling. Clay was one of the earliest materials used to produce ceramics, but many different ceramic materials are now used in domestic, industrial and building products. Ceramic materials tend to be strong, stiff, brittle, chemically inert, and non-conductors of heat and electricity, but their properties vary widely
Ceramic vs. Steel
Friction/Vibration
Ceramic
High surface finish
Smaller contact ellipse with race
Lubrication
Ceramic requires less lubrication
Advantages of ceramic Bearing over steel
Increased speed capability over conventional all steel bearing
Increased stiffness
Reduced weight
Higher accuracy
Less friction resulting in less heat
Reduced lubrication requirements and in some applications eliminating grease or oil completely
Non-Conductive
All of which can lead to extended operation lif
conclusion
Will not corrode or rust
2/3 the weight of steel
Resistant to resist acids, alkali, blood, salt and water
Extremely low coefficient of friction and thermal expansion
Lower friction results in less energy consumed .