Looks like I started a good arguement at work
Dan is convinced both our engineer and the customer are mistaken in using this material.
He believes the large grain structure of the ceramic material will cause micro fractures in the sapphire bearings, which intern will result in increased wear.
On there side, they believe the bearing and shaft will form a proper wear surface and run on fluid as designed. They now have me setting up a 30-60 day trail.
Will let you know what I find.
Dave