Patent ID: 8927446
Filing Date: 2015-01-06
Classification: B22F,C04B,C22C,Y10S

Abstract:
1. A roller bearing comprising an inner ring, and outer ring, and at least one rolling element, a rolling surface of which is formed from a ceramic material, wherein said ceramic material consists essentially of 50 to 75 wt % of a zirconia matrix of zirconia, yttrium and cerium, 25 to 49.5 wt % of alumina, 0.5 to 5 wt % of metal aluminate platelets, and any unavoidable impurities, and wherein the yttrium and cerium are present in the zirconia matrix in a molar ratio of 0.15 to 0.5 and in a combined amount of 5 to 15 mol %.