COATED CUTTING TOOL Russian patent published in 2022 - IPC B23B27/14 B23P15/28 C23C16/02 C23C16/34 C23C16/36 C23C16/40 C23C16/44 C23C28/00 C23C28/04 B32B7/22 B23C5/16 B32B18/00 

FIELD: chemistry.

SUBSTANCE: invention relates to a coated cutting tool comprising a base and a coating, wherein coating contains inner multilayer α-Al₂O₃ and outer monolayer α-Al₂O₃, outer monolayer thickness α-Al₂O₃ is 1–10 mcm, preferably 3–5 mcm, and thickness of inner multilayer α-Al₂O₃ is less than or equal to 35 % of the total thickness of the inner multilayer α-Al₂O₃ and outer monolayer thickness α-Al₂O₃, and wherein said multilayer α-Al₂O₃ consists of alternating sublayers α-Al₂O₃, and TiCO, TiCNO, AlTiCO or AlTiCNO sublayers, wherein said inner multilayer α-Al₂O₃ contains at least 5 sublayers α-Al₂O₃, and at least one layer of TiC, TiN, TiAlN or TiCN, located between the base and the inner multilayer α-Al₂O₃.

EFFECT: this arrangement of layers in coating of cutting tool increases its wear resistance when cutting metals and turning, especially when processing hardened steel.

13 cl, 1 dwg, 6 tbl