Abstract
Plasma sprayed oxides are effective coatings against wear and corrosion. Low particle velocity in the plasma jet causes a limited interlamellar cohesion. HVOF-sprayed ceramic coatings emerged as an improved alternative. In this paper, microstructural characteristics and tribological performances of HVOF sprayed Al2O3, nanostructured Al2O3 and Cr2O3 coatings are compared to reference plasma-sprayed Al2O3 and Cr2O3. The microstructure is analysed by SEM, EDS and XRD. Hardness and fracture toughness are investigated by instrumented indentation and elastic modulus by 3-point bending. Steel wheel and rubber wheel tests have been used to assess dry particle abrasion resistance. Sliding wear resistance is tested by pin-on-disk at room temperature and at 400°C, against SiC and 100Cr6 steel balls. HVOF-sprayed coatings are denser and have better interlamellar cohesion thanks to increased particle velocity. They are harder, tougher, possess a higher elastic modulus and lower porosity. Dry particles abrasion resistance is definitely superior to plasma-sprayed ceramics due to higher toughness; sliding wear resistance is higher, particularly at 400°C.
| Original language | English |
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| Title of host publication | Proceedings of the International Thermal Spray Conference |
| Subtitle of host publication | Thermal Spray 2006 |
| Publisher | ASM International |
| Number of pages | 6 |
| ISBN (Print) | 978-087-17085-2-6 |
| Publication status | Published - 2006 |
| MoE publication type | A4 Article in a conference publication |
| Event | International Thermal Spray Conference, ITSC 2006 - Seattle, United States Duration: 15 May 2006 → 18 May 2006 |
Conference
| Conference | International Thermal Spray Conference, ITSC 2006 |
|---|---|
| Country/Territory | United States |
| City | Seattle |
| Period | 15/05/06 → 18/05/06 |