How hard is fullerene-like CN_x? Some observations from the nanoindentation response of a magnetron-sputtered coating

Authors

I. Arce Garcia, Newcastle University, United Kingdom
E. G. Berasategui, Newcastle University, United Kingdom
S. J. Bull, Newcastle University, United Kingdom
T. F. Page, Newcastle University, United Kingdom
J. Neidhardt, Linköpings universitetFollow
L. Hultman, Linköpings universitetFollow
Niklas Hellgren, University of Illinois at Urbana-ChampaignFollow

Document Type

Article

Publication Date

1-1-2002

Abstract

Thin fullerene-like CNxcoatings deposited on hard substrates (e.g. SiC) show very shallow residual impressions when investigated by nanoindentation at displacements less than the coating thickness. The low work of indentation (i.e. the small area enclosed by the loading and unloading curves) of these materials implies a large amount of recovery of indent depth which is often associated with materials of high hardness. However, analysis of the unloading curves by the Oliver-Pharr method generates hardness values which are usually less than that of silicon. Detailed analysis of the loading curve shows three distinct regimes of behaviour corresponding to behaviour controlled by surface roughness, elastic deformation and plasticity. Measurements of Young’s modulus from the elastic part of the loading curve, from the Oliver-Pharr method and from elastic wave measurements are all consistently low. This implies that the material behaves like a very hard rubber which undergoes considerable elastic recovery on unloading but does not have a very high resistance to penetration on loading. The very high H/E values for fullerene-like CNxconfirms this view. © 2002 Taylor & Francis Ltd.

Comments

Originally published as:

Garcia, I. A., Berasategui, E. G., Bull, S. J., Page, T. F., Neidhardt, J., Hultman, L., & Hellgren, N. (2002). How hard is fullerene-like CN _x  ? Some observations from the nanoindentation response of a magnetron-sputtered coating. Philosophical Magazine A, 82(10), 2133–2147. https://doi.org/10.1080/01418610208235723

Recommended Citation

Garcia, I. Arce; Berasategui, E. G.; Bull, S. J.; Page, T. F.; Neidhardt, J.; Hultman, L.; and Hellgren, Niklas, "How hard is fullerene-like CN_x? Some observations from the nanoindentation response of a magnetron-sputtered coating" (2002). Educator Scholarship & Departmental Newsletters. 110.
https://mosaic.messiah.edu/mps_ed/110