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

FIELD: metallurgy.

SUBSTANCE: sandwiched coating is applied by vacuum plasma method. First, a lower layer of titanium nitride is applied. Then, an upper layer of nitride of titanium, aluminium and chrome is applied at the following component ratio, wt %: titanium 75.5-82.5, aluminium 14.0-20.0, molybdenum 3.5-4.5. Application of coating layers is performed with three cathodes located horizontally in one plane, the first one of which consists of titanium and aluminium alloy, the second one consists of titanium and is located opposite to the first one, and the third one is comprised by 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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