21-07-2014, 02:11 PM
CERAMIC BALL BEARING
CERAMIC BALL BEARING.ppt (Size: 751.5 KB / Downloads: 139)
Introduction
Silicon Nitride was developed in 1963 by NASA.
The machine tool industry has been a pioneer in the use of ceramic hybrid ball bearings
Hi-performance motor racing programs, like Formula-1, are using ceramic hybrids.
Silicon Nitride ceramic balls are virtually indestructible, survive in thermal, heavy load, won't dent or rust, virtually unbreakable and will not wear or degrade over time.
What is a Ceramic Hybrid Ball Bearing?
A Ceramic Hybrid Ball Bearing made of ceramic elements from silicon nitride.
Silicon nitride is a highly processed silica and ceramic material.
The use of Ceramics for bearing components results in a far superior product.
Types of Ceramic Ball Bearings
Ceramic Hybrid Ball Bearings
Partial Ceramic Ball Bearings
Full Ceramic Ball Bearings
Micro Weld
Micro Weld occurs when microscopic surface "peaks" on the ball and race make contact and actually weld together.
This occurs even with light loading and adequate lubrication.
This results in higher temperatures, higher friction, and decreased life.
The ceramic hybrid bearing cannot micro-weld to steel, thus eliminating the problem entirely
Conclusion
Ceramic ball is tremendously harder than steel (Rockwell 78c versus Rockwell 60c for steel balls).
Ceramic ball is 60% lighter than a steel ball.
Ceramic ball is much less prone to "skid".
Ceramic ball is significantly rounder and has a finer finish than conventional steel balls.
Operating temperature for ceramic is 2000 degrees F. versus 600 F. degrees for steel.