Title

SURFACE FATIGUE AND WEAR RESISTANCE OF THIN AND THICK HARD COATINGS

SURFACE FATIGUE AND WEAR RESISTANCE OF THIN AND THICK HARD COATINGS

Authorship

Kulu, Priit; Saarna, Mart; Sergejev, Fjodor; Gregor, Andre; Sivitski, Alina; Müller, Hartmut

Kulu, Priit

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Saarna, Mart

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Sergejev, Fjodor

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Gregor, Andre

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Sivitski, Alina

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Müller, Hartmut

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DOI

10.5151/2594-5327-16913

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Abstract

Among the wear resistant coatings and deposition techniques physical vapour deposition (PVD) of hard thin coatings and high-velocity oxy-fuel (HVOF) spraying of thick WC-Co-based powder coating have provided good wear protection against various types of wear including impact wear. Different PVD coatings (mono- and multilayer) on the different substrates (hardmetal, cold work tool steel and nitrided steel) and from the thermal spayed coatings hardmetal based HVOF sprayed coatings were under the study. Influence of the post-treatment of the PVD and HVOF spray coated surfaces to the structure and properties of substrate and coatings were also studied. Cracking resistance and surface fatigue at cyclic indentation and impact wear resistance of coating systems were determined. As the result of the study of different coating systems the criteria for the coatings selection and recommendations for the improving of their wear resistance at different conditions of exploitation are proposed.

Among the wear resistant coatings and deposition techniques physical vapour deposition (PVD) of hard thin coatings and high-velocity oxy-fuel (HVOF) spraying of thick WC-Co-based powder coating have provided good wear protection against various types of wear including impact wear. Different PVD coatings (mono- and multilayer) on the different substrates (hardmetal, cold work tool steel and nitrided steel) and from the thermal spayed coatings hardmetal based HVOF sprayed coatings were under the study. Influence of the post-treatment of the PVD and HVOF spray coated surfaces to the structure and properties of substrate and coatings were also studied. Cracking resistance and surface fatigue at cyclic indentation and impact wear resistance of coating systems were determined. As the result of the study of different coating systems the criteria for the coatings selection and recommendations for the improving of their wear resistance at different conditions of exploitation are proposed.

Keywords

Hard coatings; Wear resistance; Surface fatigue.

Hard coatings; Wear resistance; Surface fatigue.