| 主权项 |
1. A friction stir welding tool made of cemented carbide comprising WC grains in a binder phase, wherein said welding tool is at least partly coated with a surface coating comprising at least a first surface coating made of at least one of a Ti compound and a Zr compound, the first surface coating being an inner layer having at least one layer of a Ti carbide layer, Ti nitride layer, Ti carbonitride layer, Ti oxicarbide layer, Ti oxicarbonitride layer, Zr carbide layer, Zr nitride layer, Zr carbonitride layer, Zr oxicarbide layer and Zr oxicarbonitride layer, and a second surface coating, the second coating being an outer layer of Al2O3, said cemented carbide being from 3 wt-% to 10 wt-% Ni. |
