Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
615610 | Tribology International | 2011 | 7 Pages |
Nano-crystalline diamond coatings were deposited on the silicon substrate using Microwave Plasma Enhanced Chemical Vapor Deposition (MPECVD). Experiments were performed by varying the H2 content in CH4/H2 plasma during synthesis. Raman spectral analysis revealed that with decrease in hydrogen content in the CH4 plasma, the ID/IG ratio decreases with the formation of smaller crystallites. Such a film possesses a large grain boundary fraction containing hydrogenated amorphous carbon (a-C:H). During tribological test, sufficient amount of hydrogen present in the grain boundary passivates the dangling σ-bond causing ultra-low friction and extremely low wear evident by improvement in microstructure.
► Nano-crystalline diamond coatings synthesized by MPECVD technique. ► Tribological properties of nano-crystalline diamond coatings. ► Passivation of dangling σ-bond causing ultra-low friction.