METHOD OF PRODUCING MULTILAYER COATING FOR CUTTING TOOLS Russian patent published in 2020 - IPC C23C14/06 C23C14/24 B23B27/14 

FIELD: technological processes.

SUBSTANCE: invention relates to application of wear-resistant coatings on a cutting tool and can be used in metalworking. Vacuum plasma sandwiched coating is applied. First, bottom layer of niobium nitride is applied. Then, upper layer of nitride of niobium, titanium and silicon compound is applied at their ratio, wt%: niobium 58.0, titanium 40.2–41.0, silicon 1.0–1.8. Coating layers are applied by three cathodes arranged horizontally in one plane, the first and second of which are made of niobium and are located opposite to each other, and third is made of titanium and silicon alloy and placed between them, wherein lower layer is applied using first and second cathodes, and upper layer is using all three cathodes.

EFFECT: result is reduced time of coating application and increased serviceability of cutting tool with multilayer coating.

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