CERAMIC BALL BEARING

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CERAMIC BALL BEARING
-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
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CONTENTS

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

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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.

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What is a Ceramic Hybrid Ball Bearing?
We can achieve new Friction-reducing Ceramic
ball bearings!
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• 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.

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Types of Ceramic Ball Bearings

• Ceramic Hybrid Ball Bearings
• Partial Ceramic Ball Bearings
• Full Ceramic Ball Bearings

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Ceramic Hybrid Ball Bearings
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Partial Ceramic Ball Bearings
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Full Ceramic Ball Bearings
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Features

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

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

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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.

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Technical Charts
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Applications

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

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Some of the Ceramic Ball Bearings
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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.

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• 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!

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References

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

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THANK YOU