Posted by: Mike Corliss ® 05/08/2009, 14:14:37 Author Profile eMail author Edit

I have a serious issue with a system we just shipped. I used ZiO2 full compliment bearings in an application (Oven) where the temperature should be about 250C. The bearing distructed in about a week. The rotational velocity is very low, 2 rpm. There is no intentional axial or radial preload. The radial load itself is small, about 5 pounds. We insured the steel shaft and bearing housing were sized to accomodate the delta CTE. I've attached a picture. One thought I have is the full compliment configuration allowed the balls to scuff, which generated particles, which caused more particles. But could this happen in as little as 40 hours? Any thoughts you have would certainly be appreciated.

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: Ceramic Bearing Failure
: Ceramic Bearing Failure -- Mike Corliss	Post Reply	Top of thread	Engineering Forum

Posted by: unclematt ® 05/08/2009, 20:35:23 Author Profile eMail author Edit

Hi Mike, From the photo, it appears the dust and debri are coming from an area that is degrading between the ceramic race and the bore it is in. In the photo it is around 12 o'clock on the race. Can you confirm this, or perhaps post a few more photos?

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: Ceramic Bearing Failure
: Ceramic Bearing Failure -- Mike Corliss	Post Reply	Top of thread	Engineering Forum

Posted by: Marky ® 05/08/2009, 14:55:13 Author Profile eMail author Edit

Hi Mike, Have you run this issue by the apps engineers at the bearing mfr? It looks like an entire bearing made of ceramic may be too fragle. Did you use grease? And maybe bearing with 52100 inner race and ceramic balls with seals to protect it is your next step. We'll get you thru this. But in the meantime I would be setting up a test and try and duplicate the faliure in house. Good Luck

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: : Ceramic Bearing Failure
: : Ceramic Bearing Failure -- Marky	Post Reply	Top of thread	Engineering Forum

Posted by: randykimball ® 05/09/2009, 09:56:57 Author Profile eMail author Edit

I too, like unclematt, wonder about the fit around the outer race. Is there some wiggle in the action generating debri? You may want a sealed version. Also, it looks like the large face in the photo has been scuffed. Did that happen first and cause the debri or was it as a result of the bearing freeze? I have not looked it up nor dealt with it, but I would expect geometrical tolerance fits between the inner and outer race and the constraining members would be considerably critical with a cermic bearing. The worst suggestion of your lifetime may be the catalyst to the grandest idea of the century, never let suggestions go unsaid nor fail to listen to them. Modified by randykimball at Sat, May 09, 2009, 10:02:31

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