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Exploitation and Wear Properties of Nanostructured WC-Co Tool Modified with Plasma- Assisted Chemical Vapor Deposition TiBN Coating

In recent years coated cemented carbides are often the first choice for a wide variety of tool inserts and applications. Its success as a cutting tool material arises from the unique combination of wear resistance and toughness, and its ability to be formed into complex shapes. The structure obtained by sintering nanoparticle powders provides a significant improvement in product properties, such as higher cutting speeds, lower tool tolerances and longer service life. In this study a multi- layered gradient coating, deposited on nanostructured cemented carbides by plasma- assisted chemical vapor deposition (PACVD) was investigated with emphasis on its exploitation properties. TiBN coating was deposited on nanostructured cemented carbide samples with the addition of 5 wt % Co, 10 wt % Co and 15 wt % Co. The samples were consolidated by one cycle hot isostatic pressing (HIP) technique. Optimal adhesion of the coating was enabled on all samples by surface treatment. Wear resistance of the obtained nanostructured cemented carbide base material with complex gradient TiBN coating was determined by erosion wear testing, friction analysis and sliding wear testing (pin on disc test). Exploitation properties i.e., tool life determination of samples was obtained using single-point turning tool test. All conducted tests showed that the TiBN coating exhibits excellent wear and exploitation properties, under chosen application conditions, including cutting speed, vc = 200 m/min, depth of cut, ap = 1 mm, and feed, fn = 0.2 mm.

PACVD ; TiBN ; cemented carbides ; sliding wear ; turning

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