Low Temperature Amorphous Al2O3 Coating
Al2O3 Coating on the polished Ti-6Al-4V disks, 16mm diameter, was carried out by HVLTS (High Voltage Low Temperature Sputtering)
The Characterization of the Coating was Performed by the Following Methods
- Metallographic Examination
- EDS analysis on the coated surface
- HRSEM to reveal surface morphology
- Nano-hardness measurements
- Friction coefficient measurements
Figures 1 and 2
The dense adherent coating with uniform thickness of 0.6µm was observed. No discontinuities at the interface or within the coating were revealed.
EDS Spectrum and Nano-Hardness Measurements
- EDS spectrum obtained from the surface revealed Al, O peaks and the substrate contribution of Ti, V peaks.
- The surface morphology was revealed as featureless by High Resolution SEM examination at up to x200.000 magnification. Nano-hardness measurements with the loading of L=5•10-3N yielded hardness level of ~ 20 GPa
- The friction experiments on Ti/Al2O3– Ti pair are in processing


The Other Physical Properties of the Coating are as Follows
- Hydrophobic (contact angle 100-103°)
- Transparency band: γ from 0.3 to 8 µm
Possible Applications
- Wear and Corrosion resistant coatings with solid lubricant properties
- Insulation coatings