INDIA Cerobear vFINAL DR 24/6/08 10:59 Page 33
Semiconductor India
With Ceramic to Success!
The vacuum and semiconductor industry have both very high demands on mechanical
components. This particularly applies for bearings. In most cases it is not possible to use
the same general principles for bearings which hold true under normal atmospheric
conditions. This particularly applies when choosing the right lubricant, material and fit.
CEROBEAR describes the engineering and manufacturing of standard full ceramic and
hybrid bearings, as well as customised bearings.
Due to growing demands standard bearings times higher frictional force than the hybrid for example plays a vital role in the exact
reach more and more often their limits of bearing. Noticeable is also the strong positioning in semiconductor industry. The
employability. These limits may be fluctuations of the friction coefficient of the extreme corrosion resistance makes the
extensively broadened by using Cerobear steel bearing. This suggests high abrasion. application of aggressive media as a
hybrid and full ceramic bearings. Hybrid lubricant possible, which than makes
and full ceramic bearings are not only used Seizing, as one of the main failure modes in extensive sealing against the environment
in the vacuum and semiconductor industry standard steel bearings due to poor unnecessary.
but also in machine tool industry, food lubrication conditions, is practically not
industry, bio and chemical industry and the possible in full ceramic bearings as well as Furthermore, the functioning in strong
aerospace industry. in hybrid bearings. magnetic fields is achieved by the non
magnetic characteristics of Si
3
N
4
and
Cerobear is a young company which is This makes it possible to use these bearings zirconium oxide (ZrO
2
). Many coating
specialised in the engineering and without lubricants. Dry running bearings plants also take advantage of ceramic’s
machining of standard and high also lead to a drastic reduction of friction characteristic of electrical isolation in
performance rolling bearings. Since its and particle emission. rolling bearings.
foundation by two alumni of the University
of Aachen, Germany in 1989 Cerobear The high young’s modulus of silicon
became a leading manufacturer of Hybrid nitride ceramic (Si
3
N
4
)
and full ceramic bearings. allows a high
stiffness of the
Full ceramic bearings consist of rings and bearings
balls made of ceramic. Compared to the full which
ceramic bearing, the rings of a hybrid
bearing are made of a high value bearing
steel. These bearings have a variety of
advantages compared to standard
bearings.
This can be well demonstrated
when comparing test stand
examinations of two similar
manufactured bearings; either
of steel or hybrid design (see
Fig. 2 and 3). With same
load conditions the steel
bearing shows a 2 to 3
June 2008 | www.semiconductor-india.com 33
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