I've recently been reading about ceramic bearings, and their increased efficiency through less friction. In certain applications, ceramic bearings spin more smoothly as a result of the balls being more perfectly round than their steel counterparts, as well as the lower volume of grease required for lubrication. The ceramic material, I understand, is also relatively resistant to thermal expansion, further reducing friction.

Are ceramic bearings used in any aircraft applications? If so, where? And how are they lubricated? Is it a nonstandard or specialized lubricant, specific to ceramics?

Thanks in advance for any info.  




2H4