| 摘要 |
PROBLEM TO BE SOLVED: To provide an Fe-based sintered alloy which has a base part and an extending part that is wider than the base part, and makes the density uniform, and to provide a manufacturing method therefor. SOLUTION: The Fe-based sintered alloy 1 is manufactured by the steps of: filling a part to be filled of a molding die with a ferrous raw powder containing 4 to 8 wt.% Cu; pressurizing the raw powder in an axial direction to form a green compact; and sintering the green compact. The Fe-based sintered alloy has the base part 2 at one side in the axial direction and the extending part 3 that is arranged on the other side in the axial direction and is wider than the base part 2. A ratio of the length L3 of the extending part 3 to a total length L is 2 to 5. A Cu content in the base part 2 is higher than that in the extending part 3. Even when the base part 2 has lower density than the extending part 3 in a state of the green compact having been molded, Cu in the extending part migrates to the base part in the sintering step, which makes the Cu content in the base part 2 higher than that of the extending part 3, thereby increases the density of the base part 2 rightly by the increment, and makes the density of the Fe-based sintered alloy uniform. COPYRIGHT: (C)2008,JPO&INPIT
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