This is the second part of comparative study between High Velocity Oxygen-Fuel (HVOF) flame-sprayed and Atmospheric Plasma-Sprayed (APS) ceramics. Dry particles abrasion test and dry sliding wear test at room temperature, 400°C and 700°C are performed. In dry sliding against SiC, at room temperature stable tribofilms are formed and mild wear (<10–6 mm3/(Nm)) occurs for all coatings. When temperature and normal load increase, making brittle cracking a significant wear mechanism, HVOF coatings become superior to APS ones, thanks to higher toughness. In dry particles abrasion, brittle fracture prevails; therefore, the tougher HVOF coatings outperform APS ones.
Comparison between Plasma- and HVOF-sprayed ceramic coatings. Part 2: tribological behaviour / Bolelli, Giovanni; Lusvarghi, Luca; T., Manfredini; E., Turunen; T., Varis; S. P., Hannula. - In: INTERNATIONAL JOURNAL OF SURFACE SCIENCE AND ENGINEERING. - ISSN 1749-7868. - STAMPA. - 1/1:(2007), pp. 62-79.
Comparison between Plasma- and HVOF-sprayed ceramic coatings. Part 2: tribological behaviour
BOLELLI, Giovanni;LUSVARGHI, Luca;T. MANFREDINI;
2007-01-01
Abstract
This is the second part of comparative study between High Velocity Oxygen-Fuel (HVOF) flame-sprayed and Atmospheric Plasma-Sprayed (APS) ceramics. Dry particles abrasion test and dry sliding wear test at room temperature, 400°C and 700°C are performed. In dry sliding against SiC, at room temperature stable tribofilms are formed and mild wear (<10–6 mm3/(Nm)) occurs for all coatings. When temperature and normal load increase, making brittle cracking a significant wear mechanism, HVOF coatings become superior to APS ones, thanks to higher toughness. In dry particles abrasion, brittle fracture prevails; therefore, the tougher HVOF coatings outperform APS ones.
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