What are CERAMIC BALL BEARINGS ?
Hybrid ceramic ball bearings
use a combination of traditional 52100 steel rings precision matched with silicon nitride (ceramic) balls. In addition to being excellent electric insulators, hybrid bearings have a higher speed capability and will provide longer service life than all-steel bearings in most applications.
Prevents electrical arcing
When electrical current passes across bearings, a washboard or fluting pattern appears on the raceways, in addition to a darkened grey appearance. This damage usually results in excessive noise which requires that the bearing be removed. Besides the surface damage, premature aging of the lubricant also occurs. The natural insulating properties of ceramic material eliminates this type of damage.
Lower maintenance costs
Maintenance costs can quickly add up if a bearing must be changed frequently. Extending the service life of a bearing without increasing maintenance costs reduces the operating cost of the equipment. The initial cost of a hybrid bearing may be higher than a standard steel bearing, but the difference is quickly recovered in maintenance savings. Less friction also results in lower energy costs.
Extended service life
Most bearings are designed into applications based on loading conditions without taking into account factors such as lubrication, contamination and maintenance. Without proper attention to these factors, a steel bearing rarely reaches its design 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.
Extended grease life
In environments that place high demands on the bearing lubricant, standard bearings experience surface wear because of insufficient lubricant film. Bearings can fail if the initial grease charge is not replenished within an acceptable period of time. Hybrid bearings run cooler and can operate with thinner lubricant films, so there is less aging of the grease and the required relubrication interval will be longer. The result is increased service life compared to standard bearings in the same operating costs.
Reduced 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. Because of the lighter weight ceramic balls and dissimilar materials, the risk of false brinelling damage is much less.
Lower operating temperatures
The heat generated in bearings is caused by viscous friction from lubrication as well as internal and external load dependent friction between the balls and raceways. Little can be done to reduce the external loads. However, ceramic balls are only 40% as dense as steel balls, so the centrifugal load generated by the balls is less and the internal friction is lower. This enables cooler running under the same operating conditions or even a higher rotational speed.
Reduced wear from contamination
In contaminated environments, solid particles create dents in the rolling surfaces and raised edges around those dents. This condition causes noise and premature wear as the steel balls roll over those surfaces. The harder ceramic ball material smooths the surface roughness with no material removal. Also, there is little evidence of adhesive wear as seen in steel bearings. The result is reduced noise and wear, and extended bearing service life.
Now offered in extra-large bore sizes especially suited for wind power generation 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, all the benefits of MRC's hybrid ceramic ball bearings are available in sizes specifically designed to fit these turbines.
These high-performance bearings provide reliable solutions to both new and installed generators, while reducing your operating costs, the risk of costly repairs and lost production.
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