METHOD OF PRODUCING SANDWICHED COATING FOR CUTTING TOOL Russian patent published in 2017 - IPC C23C14/06 C23C14/24 B23B27/14 

FIELD: metallurgy.

SUBSTANCE: vacuum-plasma application of sandwiched coating is performed, with lower layer of chrome nitride applied first. Further, an upper layer of nitride of titanium, aluminium and silicon is applied at the following element ratio, wt %: titanium 83.5-87.0, chrome 9.0-11.0, molybdenum 4.0-5.5. Application of coating layers is performed with three cathodes located horizontally in one plane, the first one of which consists of titanium and chrome, the second one consists of chrome and is located opposite to the first one, and the third one is composed of titanium and molybdenum and is located between them. Bottom layer is applied with the help of second cathode while top layer is applied by first and third cathodes.

EFFECT: higher cutting efficiency.

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