Skip to main content Accessibility help
×
×
Home

Nanoindentation and Nanoscratching of Hard Carbon Coatings for Magnetic Disks

  • T. Y. Tsui (a1), G. M. Pharr (a1), W. C. Oliver (a2), C. S. Bhatia (a3), R. L. White (a3), S. Anders (a4), A. Anders (a4) and I. G. Brown (a4)...

Abstract

Nanoindentation and nanoscratching experiments have been performed to assess the mechanical properties of several carbon thin films with potential application as wear resistant coatings for magnetic disks. These include three hydrogenated-carbon films prepared by sputter deposition in a H2/Ar gas mixture (hydrogen contents of 20, 34, and 40 atomic %) and a pure carbon film prepared by cathodic-arc plasma techniques. Each film was deposited on a silicon substrate to thickness of about 300 nm. The hardness and elastic modulus were measured using nanoindentation methods, and ultra-low load scratch tests were used to assess the scratch resistance of the films and measure friction coefficients. The results show that the hardness, elastic modulus, and scratch resistance of the 20% and 34% hydrogenated films are significantly greater than the 40% film, thereby showing that there is a limit to the amount of hydrogen producing beneficial effects. The cathodic-arc film, with a hardness of greater than 59 GPa, is considerably harder than any of the hydrogenated films and has a superior scratch resistance.

Copyright

References

Hide All
1. Chandrasekar, S. and Bhushan, Bharat, J. Tribology 112, 1 (1990).
2. Tsui, T.Y., Pharr, G.M., Oliver, W.C., Chung, Y.W., Cutiongco, E.C., Bhatia, C.S., White, R.L., Rhodes, R.L. and Gorbatkin, S.M., in Thin Films: Stresses and Mechanical Properties V, edited by Baker, S.H. et al. (Mater. Res. Soc. Proc. 356, Pittsburgh, PA), in press.
3. Anders, A., Anders, S., and Brown, I.G., Plasma Sources Sci. Technol. 4, 1 (1995).
4. Anders, S., Anders, A., Brown, I.G., Wei, B., Komvopoulos, K., Ager, J.W., III, and Yu, K.M., Surf. Coat. Technol. 68/69, 388 (1994).
5. Pharr, G.M., Callahan, D.L., McAdams, S.D., Tsui, T.Y., Anders, S., Anders, A., Ager, J.W. III, Brown, I.G., Bhatia, C.S., Silva, S.R.P., and Robinson, J., submitted, Applied Phys. Lett.
6. Oliver, W.C. and Pharr, G.M., J. Mater. Res. 7, 1564 (1992).
7. Pharr, G.M., Oliver, W.C., and Clarke, D.R., J. Elec. Mater. 19, 881 (1990).
8. Simmons, G. and Wang, H., Single Crystal Elastic Constants and Calculated Aggregate Properties: A Handbook, 2nd ed. (MIT Press, Cambridge, MA, 1971).
9. Brookes, C.A., in The Properties of Diamond, edited by Field, J. E. (Academic Press, New York, NY, 1979), pp. 383402.
10. Johnson, K.L., Contact Mechanics, 1st ed. (Cambridge University Press, Cambridge, UK, 1985), p. 155.
11. Tabor, D., The Hardness of Metals, 1st ed. (Oxford University Press, Oxford, UK 1951).
Recommend this journal

Email your librarian or administrator to recommend adding this journal to your organisation's collection.

MRS Online Proceedings Library (OPL)
  • ISSN: -
  • EISSN: 1946-4274
  • URL: /core/journals/mrs-online-proceedings-library-archive
Please enter your name
Please enter a valid email address
Who would you like to send this to? *
×

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed