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What Is A Hybrid Bearing?
A hybrid bearing is made up of metal rings and silicon nitride ceramic balls with lubricant and retainer appropriate to the type of bearing and application. The silicon nitride balls typically allow for higher speeds, lower operating temperatures, extended lubricant life and many other performance enhancements.
Why Do CERBEC Silicon Nitride Balls Improve Bearing Performance?
Compared to steel balls, CERBEC balls are lighter, smoother,
stiffer, harder, corrosion resistant, and electrically resistant. These fundamental characteristics allow for a wide range of performance enhancements in bearings.
Are Ceramic Balls Brittle and Fragile?
Silicon Nitride ceramic balls do not have as high a toughness or ductility as steel. But, due to their high strength, stiffness, and microstructural make-up, they are actually much more durable than steel balls.
Compare The Material Properties of Silicon Nitride Balls to Steel Balls.
CERBEC balls are >60% lighter, >50% stiffer, >70% smoother, and much, much harder than steel balls. CERBEC balls have >100X better rolling contact fatigue life in comparison to Vacuum Melt 52100 Steel.
What Applications Use Hybrid Bearings?
The most common application today is angular contact bearings
for high speed machine tool spindles. End-users are seeking higher speed, longer life, reduced lubrication, and decreased total operating costs. CERBEC balls are used in a very wide range of applications from dental handpieces to surgical saws to wing-flap actuators to electric motors.
Are CERBEC Balls More Expensive Than Steel Balls?
Yes. In direct comparison, CERBEC balls are clearly more expensive than steel balls. BUT, when assembled into a hybrid bearing, the price of the bearing assembly is actually quite competitive when compared to all steel bearings. On a Total Operating Cost basis, hybrid bearings typically always pay for themselves many times over in extended life time, enhanced performance, or increased durability. Over the past 15 years, CERBEC balls have steadily become more and more affordable for a wider range of applications as the volumes have climbed.
How Do You Make a CERBEC Ball?
CERBEC balls are made from an ISO-9000 certified process starting with micron sizes powder which is compacted and then densified at extremely high pressures and temperatures. The densified blanks are then precision finished using free-abrasive diamond lapping procedures. Grade 3 and 5 precision levels are typical in high volume batch sizes.
How Are Precision Balls Specified?
CERBEC balls (and any other finished ball from all materials) are specified by using ABMA, ISO, JIS, ASTM or other standards. The sphericity, surface finish, lot diameter variation, etc…. are precisely defined by these standards into various “Grade” levels. The highest typical Grade is 3 (denoting 3 millionths sphericity or better), then 5, then 10, etc….. Bearing companies use different grades
depending on the bearing precision and application.
How Much Longer Life Can Be Expected From Hybrid Bearings Vs. Steel?
This is a tough question. Generally speaking, one can expect 2 to 5 times longer life for most
applications, but it is highly dependent on operating conditions, bearing design, etc….
What CERBEC Ball Sizes Are Available?
This is an easy question. CERBEC balls are readily available from 0.5 mm (about 1/64”) to 25mm
(1”) in a variety of ball grades. CERBEC balls can be made up to 3” (75mm) in diameter. The most popular sized balls tend to be from 1mm to 13 mm in terms of quantity used.
How Can I Buy CERBEC Balls?
We’re so glad you asked!! You can use the contact us inquiry page on this web-site or call your
local representative listed in the “About Us” section. We have sales and customer service offices in
USA, Texas, Europe, and Japan. We have manufacturing sites in Europe and USA.
How Can I Find Hybrid Bearings With CERBEC Balls Inside?
This website is designed to help you understand the benefits of using CERBEC balls and to help you link to the right bearing manufacturer for your application needs. Once you register and provide sufficient information, the linkage features of this website to bearing companies will be opened up. Furthermore, CERBEC personnel will do everything possible to get you connected with the right bearing company.
What Are The Draw-Backs Or Limitations To Using CERBEC Balls?
We’d like to say there are none, but CERBEC balls cannot be used for every application. A
stiffer ball can increase contact stresses if raceway curvatures are not adjusted. For extremely high load applications, silicon nitride balls may not be suitable since they may accelerate steel raceway fatigue. Also, silicon nitride balls are more costly than steel balls and while they continue to be more and more affordable, they may not be economical for every application despite longer life and enhanced performance.
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