Publications by authors named "Andrew L Ogrinc"
Article Synopsis
- HDLC is a solid lubricant with superlubricity potential for industrial use, but it shows different friction behavior at nanoscale compared to macroscale tests.
- To achieve superlubricity, HDLC needs to remove a thin air-oxidized layer and transform amorphous carbon into a stable graphitic structure under shear stress.
- The study finds that while transformation to graphitic films occurs, these films are not retained in the nanoscale contact area, which is essential for maintaining superlubricity in HDLC.
The lubricity of hydrogenated diamond-like carbon (HDLC) films is highly sensitive to the hydrogen (H) content in the film and the oxidizing gas in the environment. The tribochemical knowledge of HDLC films with two different H-contents (mildly hydrogenated vs highly hydrogenated) was deduced from the analysis of the transfer layers formed on the counter-surface during friction tests in O and HO using Raman spectroscopic imaging and X-ray photoelectron spectroscopy (XPS). The results showed that, regardless of H-content in the film, shear-induced graphitization and oxidation take place readily.
View Article and Find Full Text PDF