CUTTING TOOL WITH COATING Russian patent published in 2021 - IPC C22C29/08 B23P15/28 C23C30/00 

FIELD: powder metallurgy.

SUBSTANCE: invention relates to powder metallurgy, in particular to a cutting tool containing a base of cemented carbide and coating applied to it. The base of cemented carbide contains WC, a cobalt binding phase, and a gamma-phase and has a surface zone enriched with the binding phase and depleted in the gamma-phase with thickness from 14 to 26 mcm. Cemented carbide contains an evenly distributed gamma-phase and reduced number of abnormal WC grains. Coating contains a layer of α-Al₂O₃, a layer of TiCN, and a binding layer located between the layer of TiCN and the layer of α-Al₂O₃. The layer of α-Al₂O₃ has a texture coefficient TC (0012) ≥7.2 measured by an X-ray diffraction method using CuKα radiation and a scanning angle θ-2θ.

EFFECT: increase in resistance to plastic deformation is ensured, while maintaining impact strength.

11 cl, 1 dwg, 8 tbl, 5 ex