Abstract
The fatigue life of thermally sprayed Al2O3- and Cr2O3-based coatings has been studied under low-energy (0.7–5 mJ) impact conditions. A threshold impact energy and amount of repetitions the coatings can endure with said energy before catastrophic failure was obtained. The catastrophic failure was determined to occur when the fracture mode of the coating switched from brittle cone cracking to quasi-plastic radial cracking. The results are examined relative to the microstructural features along with other properties of the coatings - hardness and cavitation resistance. The experiment provided a new approach for a straightforward comparison of the micro-scale impact fatigue life of thermally sprayed coatings unachievable with previous methods.
| Original language | English |
|---|---|
| Pages (from-to) | 245-254 |
| Journal | Surface and Coatings Technology |
| Volume | 371 |
| DOIs | |
| Publication status | Published - 15 Aug 2019 |
| Publication type | A1 Journal article-refereed |
Funding
This work was supported by the graduate school of the President of Tampere University of Technology ; and Business Finland (Finnish innovation funding, trade, investment, and travel promotion organization), its “Ductile & Damage Tolerant Ceramic Coatings”-project and the participating companies. The authors are grateful to Mr. Mikko Kylmälahti from Tampere University of Technology and Mr. Veli-Pekka Tarkiainen from Valmet Technologies Inc. (Jyväskylä, Finland) for spraying the coatings.
Keywords
- Ceramic coating
- Characterization
- Fracture
- Impact test
- Surface fatigue
- Thermal spray
Publication forum classification
- Publication forum level 1
ASJC Scopus subject areas
- General Chemistry
- Condensed Matter Physics
- Surfaces and Interfaces
- Surfaces, Coatings and Films
- Materials Chemistry