The tribological behavior of high-velocity oxyfuel sprayed Co-28%Mo-17%Cr-3%Si coatings, both as sprayed and after heat treatments at 200, 400, and 600 °C for 1 h, has been studied. The as-sprayed coating contains oxide stringers and is mostly amorphous. It has low hardness (∼6.7 GPa) and toughness and undergoes adhesive wear against 100Cr6 steel. The friction coefficient increases up to ∼0.9, so the flash temperature reaches a critical oxidation value; then, friction decreases and increases again. This phenomenon occurs periodically. Much adhesive wear occurs in the first stage. Abrasive wear prevails against alumina pin: the coating wear rate is lower because it possesses good plasticity. Thermal effects still occur. The 600 °C treatment causes formation of submicrometric crystals. Hardness increases (∼8.8 GPa), adhesive wear is prevented, the friction coefficient has no peaks. Against the alumina pin, wear rates remain similar to the as-sprayed case. Nevertheless, the friction coefficient has no peaks and its final value is lowered (from 0.84 to0.75).
Heat Treatment Effects on the Tribological Performance of HVOF-Sprayed Co-Mo-Cr-Si Coatings / Bolelli, Giovanni; Lusvarghi, Luca. - In: JOURNAL OF THERMAL SPRAY TECHNOLOGY. - ISSN 1059-9630. - ELETTRONICO. - 15/4(2006), pp. 802-810.
Data di pubblicazione: | 2006 |
Titolo: | Heat Treatment Effects on the Tribological Performance of HVOF-Sprayed Co-Mo-Cr-Si Coatings |
Autore/i: | Bolelli, Giovanni; Lusvarghi, Luca |
Autore/i UNIMORE: | |
Rivista: | |
Volume: | 15/4 |
Pagina iniziale: | 802 |
Pagina finale: | 810 |
Codice identificativo ISI: | WOS:000242981000057 |
Codice identificativo Scopus: | 2-s2.0-58349088299 |
Citazione: | Heat Treatment Effects on the Tribological Performance of HVOF-Sprayed Co-Mo-Cr-Si Coatings / Bolelli, Giovanni; Lusvarghi, Luca. - In: JOURNAL OF THERMAL SPRAY TECHNOLOGY. - ISSN 1059-9630. - ELETTRONICO. - 15/4(2006), pp. 802-810. |
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