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ISSN 2072-3172


Vereschaka A.A.

Mechanisms of adhesively fatigue wear and destruction of carbide tools with wear-resistant complexes

The paper studies mechanisms of cracking in multi-layered composite nano-structured coatings, deposited through the use of the technologies of filtered cathodic vacuum arc deposition (FCVAD) (coatings Zr-ZrN-(ZrCrAl)N, Cr-CrN-(TiCrAl)N, Zr-ZrN -(ZrNbTiAl) and LAteralRotatingCathodes (coating Ti-TiAlN-TiAlN). The paper focuses on the research of such coating parameters as hardness, adhesion strength to substrate, element composition, microstructure, kinetics and mechanisms of wear. The microstructural studies have revealed the typical mechanisms of cracking and their influence on kinetics of wear of coated carbide tools. The study also included extensive certification tests of cutting properties of tools equipped with cutting inserts of carbides with the coatings under study at longitudinal turning of steel C45 (HB 200). The results of the studies have shown that all the coatings selected for study significantly increase tool life of carbide tools: by up to 3-4 time in comparison with an uncoated tool and by 1.5-2 times – in comparison with a tool with "reference" coating TiN. The paper also studied the influence of ZrN in composition of coatings on cracking mechanisms in coatings and kinetics of tool wear.

Keywords: wear-resistant coatings; tool life; PVD coatings; adhesion processes.

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