MULTILAYER COMPOSITE COATING FOR CUTTING TOOLS FOR PROCESSING TITANIUM ALLOYS IN INTERMITTENT CUTTING CONDITIONS Russian patent published in 2020 - IPC C23C30/00 C23C14/06 C23C14/16 B23B27/14 

FIELD: manufacturing technology.

SUBSTANCE: invention relates to a multilayer composite coating of a cutting tool for processing titanium alloys in intermittent cutting conditions which can be synthesized by ion-plasma methods. Coating contains an adhesive layer, a transition layer and a wear-resistant layer successively applied on the working surface of the tool and consisting of alternating layers of nanosized thickness of refractory compounds. Adhesive layer contains zirconium, transition layer contains refractory zirconium compounds, and alternating nanolayers of wear-resistant layer contain refractory zirconium compounds alloyed with formation of solid dissolution of metals IV, and/or V, and/or VI groups of periodic table of chemical elements and additionally aluminum and silicon. Thickness of adhesive layer is 20–40 nm, thickness of transition layer is 0.4–0.6 mcm. Alternating nanolayers of the wear-resistant layer represent a sequence of two layers repeating 100 or more times, one of which contains 20–30 at% of aluminum, and the other one – 10–15 at% of aluminum, with thickness of 6–25 nm.

EFFECT: technical result consists in expansion of technological capabilities of multilayer coating on working surfaces of metal cutting tools due to combination of high hardness and wear resistance with sufficient plasticity and crack resistance, as well as in absence of chemical affinity of coating material and processed material.

1 cl, 4 dwg, 2 ex