I would suggest using a bearing, with a material combination of two much harder materials then the particles.
Bearings made of Silicium Carbide Ceramic might work very well. We at Ceratec have many years of experience producing, and engineering ceramic / metal bearings, wich are most of the time...
Thank you for your replies, Jimmetalsceramics and metman.
As said in your first point metman, I want the same material throughout for a semiconductor application. Metal may not be used in this application. What is possible
For an other application where leak tightness is important, sounds the...
Ceratec Technical Ceramics in the Netherlands delivers bearing grade ceramic balls.
Materials they can deliver are: alumina, zirconia, silicon nitride, silicon carbide, rubin and sapphire.
more info on www.ceratec.nl
critical speed [~/min] depends on outside diameter (D) of bearing
D<30: n = {(3 * A) / (D + 30)}* k or,
D_>30: n = {A / (D-10)} * k
A (grease lubrication)
A = 500000; in case of radial ball bearing
A = 360000; in case of double row angular ball bearing
A = 320000; in case of...