| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a rolling device which has a long life even in a corrosive environment. <P>SOLUTION: At least one of an inner race 1, an outer race 2, and a ball 3 composing a deep groove ball bearing is configured using a ceramic material containing at least 99.5 mass% aluminum oxide. The ceramic material contains crystal grains of aluminum oxide by 10 to 80% at the area ratio, which aluminum oxide has the anisotropy at an aspect ratio of at least 2. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
