| 摘要 |
The invention provides a surface coating cutting tool, which has a hard coating layer. The hard coating layer has excellent lubrication, blade breakage resistance and wear resistance during high-speed interrupted Ti alloy and stainless steel cutting processing operations, etc. The surface coating cutting tool has a tool substrate surface provided with a curing layer and further provided with an aluminum oxide layer having an average thickness ranging from 0.2 mu m to 5 mu m and further having relatively high smoothness. The aluminum oxide layer is composed of a base material and ball tissues dispersed inside the base material. The base material is composed of amorphous phases of the aluminum oxide. The ball tissues are composed of one or two of a needle crystalline phase and a plate-shaped crystalline phase and amorphous phase collecting bodies. The area proportion of the ball tissues inside the longitudinal section of the aluminum oxide layer is between 20- 60 area percent. The radius of an approximate circle ranges from 0.02 mu m to 0.5 mu m. The aluminum oxide base material contains 1-10 atom percent of chlorine. |
