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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