Low Temperature Amorphous Coating

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