http://www.skf.com/portal/skf/home/p...&newlink=1_5_0

http://bearings.globalspec.com/Learn...ybrid_Bearings
<-- contains directory to manufacturers, including SKF

http://www.arofe.army.mil/Conference...op/20Takii.htm
<-- application and advantages of nitride coated dry self lubricating ceramic bearings

still a specialty item for the most part, but becoming more widely used. i could not find material specifics on the english skf website, but it might be on the german.