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Tribological studies on PVD/HVOF duplex coatings on Ti6Al4V substrate

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Title: Tribological studies on PVD/HVOF duplex coatings on Ti6Al4V substrate
Authors: Bemporad, E.1 e.bemporad@stm.uniroma3.it, Sebastiani, M.1, Staia, M.H.2, Puchi Cabrera, E.2
Source: Surface & Coatings Technology. Dec2008, Vol. 203 Issue 5-7, p566-571. 6p.
Subjects: Surface coatings, Physical vapor deposition, Tribology, Mechanical wear, Hardness, Simulation methods & models
Abstract: Abstract: In the present work, tribological performances of duplex coatings (Ti/TiN PVD and WC-Co HVOF) on Ti6Al4V substrates were investigated by analytical modelling and experimental assessment of mechanical/tribological properties. An analytical study of the contact stress distribution under a spherical indenter was performed, considering changes in stress distribution after adoption of the WC-Co intermediate coating as a load support layer. Experimental activities consisted of micro- and nanoindentation testing, HRC adhesion test and ball-on-disc sliding wear test (Alumina counterpart) under dry atmosphere. Morphology of the worn surface and layer failure mechanisms (i.e. wear mechanisms, coating surface and sub-surface delamination, crack propagation modes, role of interfaces) were then analysed by FIB-SEM techniques. Results showed that the use of a WC-Co interlayer with intermediate hardness and stiffness provides a more effective distribution of contact strain, with a significant increase of load carrying capacity and wear resistance of samples. A correlation between results of simulations, H/E and H 3/E 2 ratios and wear resistance of coatings is finally proposed. [Copyright &y& Elsevier]
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Database: Engineering Source
Description
Abstract:Abstract: In the present work, tribological performances of duplex coatings (Ti/TiN PVD and WC-Co HVOF) on Ti6Al4V substrates were investigated by analytical modelling and experimental assessment of mechanical/tribological properties. An analytical study of the contact stress distribution under a spherical indenter was performed, considering changes in stress distribution after adoption of the WC-Co intermediate coating as a load support layer. Experimental activities consisted of micro- and nanoindentation testing, HRC adhesion test and ball-on-disc sliding wear test (Alumina counterpart) under dry atmosphere. Morphology of the worn surface and layer failure mechanisms (i.e. wear mechanisms, coating surface and sub-surface delamination, crack propagation modes, role of interfaces) were then analysed by FIB-SEM techniques. Results showed that the use of a WC-Co interlayer with intermediate hardness and stiffness provides a more effective distribution of contact strain, with a significant increase of load carrying capacity and wear resistance of samples. A correlation between results of simulations, H/E and H 3/E 2 ratios and wear resistance of coatings is finally proposed. [Copyright &y& Elsevier]
ISSN:02578972
DOI:10.1016/j.surfcoat.2008.06.055