CERAMIC BALL BEARING AAsst Prof. K M BASAPPAJI M.Tech(Ph.D) -BY ADARSHA KUMAR P G UNDER THE GUIDANCE OF AAsst Prof. K M BASAPPAJI M.Tech(Ph.D) Asst Professor, Dept of Mechanical Engg JNNCE. KODE MAHESH

CONTENTS Introduction What is a Ceramic Hybrid Ball Bearing? Types of Ceramic Ball Bearings Features Technical Charts Applications Conclusion References

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? We can achieve new Friction-reducing Ceramic ball bearings!

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

Ceramic Hybrid Ball Bearings

Partial Ceramic Ball Bearings

Full Ceramic Ball Bearings

Features 60% lighter than steel balls. 50% higher modulus of elasticity. Tribochemically inert. Non-conductive. Less maintenance. Coefficient of Friction. Low Density.

High Hardness. High Hot Strength. Low Coefficient of Thermal Expansion. Long Fatigue Life. Corrosion Resistance.

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.

Technical Charts

Applications Motor Racing. Motorcycle Racing. Machine tool applications. Aircraft accessories/aerospace. Industrial Machinery. Medical equipment.

Some of the Ceramic Ball Bearings

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.

Vibration levels of ceramic hybrid bearings average two to seven times lower than that of steel. Service life is two to five times longer than conventional steel ball bearings. 25% of all electrical energy produced is used to power some type of electric motor. Imagine the savings in resources if all motors were to run with ceramic hybrid ball bearings!

References Elements of machine design by Khurmi. www.bearingworks.com www.cbrbearing.com www.bearing-china.com www.mcrbearingservices.com

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