Back to Search
Start Over
Microstructure and mechanical properties of plasma sprayed alumina-based coatings
- Source :
- Ceramics International. 40:12861-12867
- Publication Year :
- 2014
- Publisher :
- Elsevier BV, 2014.
-
Abstract
- Alumina-based coatings are employed in many industrial applications, in order to protect the surface of metal components against high temperature, wear, corrosion and erosion. In this work two different alumina-based coatings were fabricated by atmospheric plasma spraying (APS), starting from powder particles composed of pure Al2O3 and Al2O3-3 wt% TiO2, respectively. Their phase composition was investigated by X-Ray Diffraction (XRD) and revealed that both the as-sprayed coatings were mainly composed of metastable γ- and α-Al2O3 phases. The γ phase recrystallized to α phase after heat treatment. The porous microstructure was analyzed by Scanning Electron Microscopy (SEM) and Energy Dispersive Spectroscopy (EDS). Thin TiO2-rich splats were observed within the microstructure of alumina-titania coatings. The pure alumina coatings exhibited similar porosity and higher microhardness than the alumina-titania ones (12.8 against 9.9 GPa). Both the coatings herein analyzed are particularly promising for high-temperature anti-wear applications, because of their enhanced mechanical properties. © 2014 Elsevier Ltd and Techna Group S.r.l.
- Subjects :
- Materials science
Scanning electron microscope
Process Chemistry and Technology
Metallurgy
Microstructure
Coatings
Plasma spraying
D. Alumina
Energy-dispersive X-ray spectroscopy
Atmospheric-pressure plasma
Indentation hardness
Surfaces, Coatings and Films
Electronic, Optical and Magnetic Materials
Corrosion
Coating
Chemical engineering
Phase (matter)
Materials Chemistry
Ceramics and Composites
Porosity
Subjects
Details
- ISSN :
- 02728842
- Volume :
- 40
- Database :
- OpenAIRE
- Journal :
- Ceramics International
- Accession number :
- edsair.doi.dedup.....d8aafccd4d5f432dea2eaf5632d2fe1b