A study of the tribological behaviour of three carbon-based coatings, tested in air, water and oil environments at high loads

Tribological performance of an H-DLC coating prepared by PECVD

“…under dry, water, oil or a combination of these [8,9]. In the case of unlubricated conditions, the influence of loading and sliding velocity on the CoF and wear rates becomes essential.…”

Sliding wear of a-C:H coatings against alumina in corrosive media

“…Conversely, for the system investigated by Stallard et al [23], in which the substrate is a M42 steel whose yield strength is 2.4 GPa (curve g in Fig. 7), it is expected that the deformation of the substrate will not take place and that the coating will maintain its integrity.…”

“…These include the work of Liu et al [20], Mohrbacher and Celis [21], Ronkainen et al [22], Yi et al [12], Azzi et al [10], Stallard et al [23], Manhabosco et al [24] and Park et al [15], for different systems involving DLC coatings. Particularly, the work of Liu et al [20] represents an example of the behavior of a coating similar to the one employed in the present study, tested in 85% humid environment.…”

“…Liu et al [20] Mohrbacher and Celis [21] Ronkainen et al [22] Yi et al [12] Azzi et al [10] Stallard et al [23] Manhabosco et al [24] Park et al [15] and substrate at the interface indicated in Table 3, it can be concluded that in those systems where the stress in the coating found in the vicinity of the interface exceeds a threshold value of the von Mises stress of approximately 370 MPa, coating failure with spallation will take place, regardless of the substrate nature on which this coating was deposited. A plausible mechanism for explaining the failure of the investigated coated systems, when this threshold stress value is achieved, could be the attainment of a critical stress intensity for the nucleation and propagation of cracks in the DLC coatings.…”

Manufacturing and Characterization of a Carbon-Based Amorphous (a-CNX) Coating Material

“…Carbon-based thin (\ 1 lm) or thick ([ 1 lm) films were developed to address a broad range of functional applications such as hydrogen-free amorphous carbon nitride (a-CN X ) film is used as direct current (DC) electrical conductor to increase electrical conductivity [2], as wear resistance against nonlubricated surfaces due to its excellent low friction coefficient [3], as hard protective layers in magnetic storage devices [4], and in biomedical applications for reducing orthodontic friction between archwire and bracket both in ambient air and saliva [5]. Several studies demonstrated that carbon-based amorphous films have lower internal stress and good adhesion [6], high load bearing capability [7], high sliding wear resistance [8], low friction coefficient [9], and excellent elastic recovery and hardness [10].…”