Technical Seminar on

Ceramic Ball Bearings

BY SACHIN KADWADKAR USN-1MJ09ME058

CONTENTS

Introduction What is a Ceramic Hybrid Ball Bearing? Types of Ceramic Ball Bearings Features Technical Charts Advantages 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

Full Ceramic Ball Bearings

Ceramic Hybrid Ball Bearings

Full Ceramic Ball Bearings

Features

Non-conductive. 50% higher modulus of elasticity. Low Density Less maintenance. Coefficient of Friction. Corrosion Resistance High Hardness

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.

TechnicalChartsTemperature

The service life of ceramic hybrid bearings

Service life

Vibration

Running speed

The running speed ceramic ball bearing.

Advantages

Lower Maintenance Cost Extended Service Life Prevents Electrical Arcing Extended Grease Life Reduced Wear From Vibration Lower Operating Temperature Reduced Wear From Contamination

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