Abstract
A new combination of two- and three-layer coatings on carbide-cutting instruments can be obtained by forming a boride-containing underlayer (CoWB) by a diffusion process, and by chemical vapour deposition (CVD) of TiC-TiCN or TiC-Al 2O 3 on the CoWB. The effect is shown of the thickened cobalt net structure on the increase in WC grains and on the decrease in contact surface between the grains of (Ti, Ta, W)C after repeated heating and chemical treatment of the carbide alloy. Comparative tests of cutting on steel and cast iron were carried out using various types of coated cutting plates. Combined coatings are found to prolong the lifetime of carbide instruments by more than 200% in comparison with the coating obtained by CVD alone.
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