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 70.5-79.5, aluminium 14.0-20.0, chrome 6.5-9.5. Application of layers of the coating 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 composite, out of titanium and chrome, and is located between them; with that, the lower layer is applied using the second cathode, and the upper layer is applied using the first and the third cathodes.

EFFECT: higher cutting efficiency.

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