Impact of house UV irradiation on the mechanical and tribological properties of Cr and B doped hydrogen-containing diamond-like movies: Fullerenes, Nanotubes and Carbon Nanostructures: Vol 0, No 0

Summary

To advertise the large utility of hydrogen-containing diamond-like movies (a-C:H) as stable lubricant supplies in aerospace atmosphere, a sequence of a-C:H, a-C:H doped with Cr components (Cr/a-C:H) and a-C:H doped with B components (B/a-C:H) have been ready on the GCr15 metal by non-equilibrium magnetron sputtering approach. The consequences of ultraviolet (UV) irradiation on the mechanical and tribological properties of the three DLC movies have been investigated. UV irradiation was discovered to trigger a decline in hardness and modulus of elasticity, and elevated residual stress and floor roughness in all three movies. UV irradiation has a minor affect to the coefficient of friction of the three movies, however results in a lower in put on life. The damage lifetime of Cr/a-C:H movies was least affected by UV irradiation. UV irradiation can result in the breakage of sp³C-H bonds in a-C:H movie and B/a-C:H movie, ensuing within the improve of dangling bonds within the movies and the lower of damage life. Within the Cr/a-C:H movie, the damaged sp³ C-H bond is partially reorganized into sp² C-H bond, which additional exerts the passivation impact of C-H bond, leading to a smaller lower within the put on lifetime of the Cr/a-C:H movie.