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Mechanism behind manifestation of high and super low values of friction coefficients in turbostratic graphite during tribology tests carried out under nitrogen and argon exposures is investigated. Super low value in argon environment is attributed to self-organization and superficial mobility of crystallites at contact interface whereas similar tests under nitrogen atmosphere revealed high friction...
Nano-crystalline diamond coatings were deposited on the silicon substrate using Microwave Plasma Enhanced Chemical Vapor Deposition (MPECVD). Experiments were performed by varying the H 2 content in CH 4 /H 2 plasma during synthesis. Raman spectral analysis revealed that with decrease in hydrogen content in the CH 4 plasma, the I D /I G ratio decreases...
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