Ceramic Ball
Bearing
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INTRODUCTION
• Ceramic bearings are typically constructed with a ferrous inner and outer
ring or race with ceramic balls in the place of steel.
• Ceramic bearings offer many advantages over all steel bearings, such as
higher speed and acceleration capability, increased stiffness, lower
friction and more.
• Ceramic balls are also nonconductive. Ceramic bearings are available in
all standard industry configurations such as, angular bearings, thrust
bearing, pillow block bearing, needle bearings, and roller bearings.

PROPERTIES
• Ceramic bearings balls are typically made from (Si3N4) ceramic silicon
nitride and have greater hardness than steel balls resulting in longer ball
life.
• Ceramic bearing balls have smoother surface finishes than most steel
bearing balls.
• Thermal properties are also better steel balls which result in less heat
generation due to friction at high speeds.
• To manufacture a extra fine surface finish on ceramic balls, the balls are
elevated with a magnetic field and then polished with plasma stream.
• Ceramic bearings balls are rated at higher spin rates than steel bearing
balls.

• Ceramic bearing balls can weigh up to 40% less than steel ones, depending on
size and material.
• This reduces centrifugal loading and skidding, so hybrid ceramic bearings can
operate 20% to 40% faster than conventional bearings.
• This means that the outer race groove exerts less force inward against the ball
as the bearing spins.
• This reduction in force reduces the friction and rolling resistance.
• The lighter balls allow the bearing to spin faster, and uses less energy to
maintain its speed.

Ceramic Balls for Bearings
Usually Colored:
• White
• Green
• Shiny Black
• Dark Grey
Ceramic Hybrid Bearing
Ceramic Bearing
PHYSICAL APPEARANCE

PREVENT ELECTRICAL
ARCING
• When electrical current passes across bearings, a washboard pattern
appears on the raceways, along with a darkened grey appearance.
• Typical results include bearing surface damage, premature aging of
the lubricant.
• The natural insulating properties of ceramic material eliminates this
type of damage.
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LOWER MAINTENANCE COSTS
• Extending the service life of a bearing without increasing
maintenance cuts equipment operating costs.
• The initial cost of a hybrid bearing may be higher than a standard
steel bearing, but the difference is quickly recovered in maintenance
savings.

INCREASE SERVICE LIFE
• Because of the properties of ceramics, a hybrid bearing's
service life can be up to 10 times that of a standard steel
bearing, reducing the need for maintenance on your
machine as well as the costly interruptions in production.

EXTEND GREASE LIFE
• The hybrid bearings run cooler and can operate with thinner lubricant
films than conventional bearings.
• The result? Less aging of the grease, longer relubrication intervals, and
increased service life vs. standard bearings in the same operating
conditions.

REDUCE WEAR FROM
VIBRATION
• Equipment exposed to static vibration risks false brinelling, (erosion
of the surfaces within the ball and raceway contacts), which can lead
to spalling and premature failure.
• Lighter weight ceramic balls and dissimilar materials reduce the risk
of false brinelling damage considerably.

LOWER OPERATING
TEMPERATURES
• Because ceramic balls are only 40% as dense as steel balls, the
centrifugal load that they generate is less and the internal bearing
friction is lower.
• The lower density and friction enables cooler running under the
same operating conditions, or even higher rotational speeds.

REDUCE WEAR FROM
CONTAMINATION
• Solid particle contaminants can create dents in bearing rolling surfaces
and raised edges around those dents.
• This condition causes noise and premature wear as the steel balls roll over
those surfaces.
• Harder ceramic balls smooth the surface roughness with no material
removal, thereby reducing noise and wear while extending bearing service
life.

EXTRA-LARGE BORE SIZES FOR
WIND POWER APPLICATIONS
• Electric current passage is the major cause of bearing damage in
wind power generator applications, often resulting in premature
bearing failure, generator breakdown and unplanned turbine down
time.
• Now, hybrid ceramic ball bearings are available in sizes specifically
designed to fit these turbines, reducing operating costs, the risk of
costly repairs and lost production for new and installed generators.

TECHNICAL CHARTS

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APPLICATIONS
• Aircraft generators
• Biotechnology equipment
• High speed machining and grinding spindles
• High speed mills
• Precision instruments
• Pumps and compressors

CONCLUSION
Due to the world's depleting iron stores it is important to
look to alternative production methods of steel
components. Ceramic bearings are a good way to do this as
they posses equal, if not better, qualities in service than
their steel rivals. Therefore a move into this may be seen
as a corporate and social responsibility, which would
increase popularity.

REFERENCE
• https://www.ukessays.com/essays/engineering/the-manufacture-of-ceramic-bearings.php
• http://www.ceramicbearing.com/indextemp.html
• http://www.engineersedge.com/bearing/ceramic_bearings.htm
• http://ftp.republicsales.com

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