| 摘要 |
The present invention is directed to a tool (1) for friction stir welding including a base material (2) and a coating layer (3) formed on the base material (2), wherein the coating layer (3) is formed of two or more layers, and the coating layer (3) as a whole has a thermal permeability of 8000 J/s 0.5 €¢m 2 €¢K or less, at least one layer of the coating layer (3) includes a hexagonal crystal system and/or an amorphous structure, at least one layer of the coating layer includes a cubic crystal system, and the coating layer (3) has compressive stress. |
