Abstract
Phase and element composition, microhardness, adhesive strength, wear resistance and microstructure of the coatings and underlying layers formed on WC-Co hard alloy using Nb and Mo vacuum-arc sources were studied. It is shown that the influence of ion beams with energy of 1 keV created by Nb and Mo vacuum-arc sources for at least 1–2 min allows the formation of carbide coatings based on embedded metals and alloy elements with (Nb,W)C0.7, Mo2C and Co6W6C2 phases. The synthesis of carbide layers occurred by ion exposure by Nb or Mo at a surface temperature of the hard alloy of at least 1300 °C, controlled by an optical thermograph. Reducing of Nb and Mo ion exposure time down to 30 s does not allow heating of samples surface to temperatures above 700 °C, as a result, the formation of carbide layers on the alloy surface does not occur. The plasma deposition of NbC or MoC coatings on sublayers created by preliminary Nb or Mo ion treatment accompanied by heating of the sample surface up to 1300°С forms carbide layered system with hardness of 60 GPa, adhesive strength of 120–140 N and 2–3-fold lower volume wear compared to NbC and MoC plasma coatings deposited on a hard alloy without preliminary treatment.
Published Version
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