Tribology of HVOF- and HVAF-sprayed WC-10Co4Cr hardmetal coatings: A comparative assessment
- BOLELLI, Giovanni
- LUSVARGHI, Luca
- SASSATELLI, PAOLO
- Berger, L. M.
- Börner, T.
- Koivuluoto, H.
- Lyphout, C.
- Markocsan, N.
- Matikainen, V.
- Nylén, P.
- Trache, R.
- Vuoristo, P.
DOIAbstract
This paper provides a comprehensive assessment of the sliding and abrasive wear behaviour of WC-10Co4Cr hardmetal coatings, representative of the existing state-of-the-art. A commercial feedstock powder with two different particle size distributions was sprayed onto carbon steel substrates using two HVOF and two HVAF spray processes. Mild wear rates of <10-7mm3/(Nm) and friction coefficients of ≈0.5 were obtained for all samples in ball-on-disk sliding wear tests at room temperature against Al2O3 counterparts. WC-10Co4Cr coatings definitely outperform a reference electrolytic hard chromium coating under these test conditions. Their wear mechanisms include extrusion and removal of the binder matrix, with the formation of a wavy surface morph...
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