Interfacial adhesion and friction of pyrolytic carbon thin films on silicon substrates

Abstract

Frictional behavior and interfacial adhesion of differently textured pyrolytic carbon layers on Si substrate were investigated by indentation and scratch testing. A large amount of elastic recovery and a low coefficient of friction (μ = 0.05 to 0.09) were observed. Elastic/plastic and frictional behaviors of the coatings are strongly influenced by the microstructure of the pyrolytic carbon films, especially by the texture. The critical load at which the first abrupt increase in the normal displacement occurs was used to characterize interfacial adhesive strength. A pyrolytic carbon film deposited at higher residence time from a gas mixture containing 3% oxygen exhibited higher critical loads than film deposited at lower residence time without oxygen. The results can be understood if one assumes that the gas phase composition during deposition significantly influences the bonding strength at the interface. Failure mechanisms are discussed for both types of films.

Features of Electrostatic Fields and Their Force Action When Using Micro- and Nanosized Inter-Electrode Gaps

“…Let us explain in more detail the methods mentioned, which were used to construct the curve (2), Figure 9. Based on Equations (12), (19), and (23), it can be obtained that, due to the discreteness of the charge distribution in the air gap, an increase in the ponderomotive pressure in comparison with the classical calculation occurs by a factor of K:…”

“…One of the possible practical applications of the considered influence of the EF is the possibility of increasing the adhesion of coatings deposited to substrates, both after and during their deposition, as well as a number of other effects [ 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 ]. This technological solution has great prospects for use in connection with the need to create reliable contacts [ 13 , 14 , 15 ] in electronic devices, to create protective coatings [ 10 , 11 ] and for other purposes [ 12 , 22 ].…”

“…At present, intensive development of theoretical concepts of adhesion continues, while the authors note the great influence of the electrical component of adhesion [ 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 ].…”

Effect of Post-Annealing Treatment on Mechanical Properties of ZnO Thin Films

“…The difference between indentation load and critical load is not much; this is attributed as the effect of frictional stored energy by lateral forces. So, indentation load ought to be higher to invoke delamination as compared to frictional forces [37].…”

Frictional shear induced modification of the mechanical properties of TiAl(Nb) intermetallics near the surface

“…The loading curves are punctuated by the discontinuities or 'pop-ins' in which the displacement increases at an approximately constant load. In the crystalline materials the presence of the pop-ins is invariably associated with a discrete plastic deformation phenomenon, such as dislocation nucleation or cracking [29,30].…”