Composite coating cutting tool containing chromic oxide layer

The composite coating cutting tool comprises a tool base body and a composite coating arranged on the tool base body, the composite coating comprises a nitride bottom layer, a CrON transition layer and a Cr2O3 oxide layer, and the nitride bottom layer, the CrON transition layer and the Cr2O3 oxide layer are sequentially arranged from the surface of the tool base body to the outside. The composite coating cutting tool has the advantages of being good in high-temperature wear resistance, high in impact resistance, good in oxidation resistance and the like, the bonding strength between the coatings and the bonding strength between the coatings and the tool base body are high, and synergistic improvement of heat stability, high-temperature oxidation resistance, wear resistance and the bonding force between the composite coatings is achieved; the method is particularly suitable for hard alloy indexable blades and is also suitable for other cutting tool materials such as metal ceramic and non-metal ceramic. 本发明公开了一