| 摘要 |
PROBLEM TO BE SOLVED: To provide a sintered bearing having high formability and quality stability and also producible at a low cost.SOLUTION: The sintered bearing comprises: a base part formed with iron powder and copper powder as the main components, and in which the copper content is made uniform; and a surface layer covering the surface of the base part, and in which the copper content is higher than that of the base part. As the copper powder, flat copper powder Cu1 having an aspect ratio higher than that of the iron powder and common copper powder Cu2 are used. The average grain size of the common copper powder Cu2 is made higher than the average grain size of the flat copper powder Cu1. |
