| 摘要 |
The present invention provides a surface-coated cutting tool, wherein a hard coating layer exhibits excellent chipping resistance, peeling resistance, and wear resistance in high-speed intermittent cutting machining of carbon steel, stainless steel, etc. According to the surface-coated cutting tool of the present invention, a base layer is formed the substrate of the tool surface and a hard coating Al2O3 constituting of an upper layer and a lower layer is coated thereon, wherein the lower layer is composed of crystalline Al2O3 layers, the upper layer is composed of amorphous Al2O3 layers, recessed portions are formed in the lower layer, the crystalline Al2O3 layers of the upper layer is embedded in the recessed portion to fill for film-forming, the average depth of the recessed portions is 0.5 ~ 10.0[mu]m, the average aspect ratio of the recessed portion is from 1.0 to 50, and the average horizontal spacing among the recessed portions is 0.5 ~ 20[mu]m. |
