Filtern
Erscheinungsjahr
- 2007 (2) (entfernen)
Dokumenttyp
Schlagworte
- Alumina (1)
- Aluminium oxide (1)
- Ceramics (1)
- Coatings (1)
- Corundum (1)
- Sol-gel (1)
- TEM (1)
- Transmission electron microscopy (1)
Up to ~ 3 µm thick alumina coatings on corundum ceramic, sodalimesilica glass and Inconel718 were produced from mixtures of boehmite sols and corundum suspensions.
Transmission electron micrographs in combination with electron diffraction and energy dispersive X-ray spectroscopy served to identify crystallographic phases and to characterize the microstructure of the coatings. Using corundum ceramic as substrate the initially deposited boehmite transforms via transition aluminas to corundum while heating to 1200 °C. In the cases of glass and Inconel718 thermal treatments up to 520 °C and 1100 °C, respectively, cause diffusion of ions from the substrates into the coatings. Thus additional oxide phases were formed.
All coatings are free of cracks or delaminations and do not show any directed crystal growth.