| 摘要 |
An outer ring (11), an inner ring (12) and a ball (13) that are a rolling contact member formed of sintered ² sialon inexpensive and capable of reliably ensuring sufficient durability, is constituted of a sintered body containing ² sialon as a main component and having a remainder formed of an impurity, and the outer ring (11), the inner ring (12) and the ball (13) have raceway/ rolling contact surfaces, i.e., an outer ring raceway surface (11A), an inner ring raceway surface (12A) and a ball rolling contact surface (13A) included in a portion having an outer ring high density layer (11B), an inner ring high density layer (12B) and a ball high density layer (13B) higher in density than an inner portion (11C, 12C, 13C). |
