Electrical contact resistance and its relationship to hardness
- 93 Downloads
Studies have been made of the electrical resistance at the contact between a silicon carbide indenter and various metals. It has been found that reproducible results can be obtained if the contact under load is subjected to a low-energy condenser discharge prior to the measurement of the resistance. After this pre-test operation, the electrical resistance is inversely proportional to the length of the diagonal of the indentation, as observed under a microscope. This allows one to define a hardness value, from the contact resistance measurement, that correlates well with the Vickers hardness. It is shown that the technique can be adapted to the continuous study of hardness under load for viscoelastic non-conducting materials.
KeywordsPolymer Silicon Carbide Silicon Carbide Contact Resistance
Unable to display preview. Download preview PDF.
- 1.H. J. Goldsmid andJ. N. Johnston,J. Phys. E, Sci. Instrum. 14 (1981) 1329.Google Scholar
- 2.Idem, J. Mater. Sci.17 (1982) 1012.Google Scholar
- 3.R. Holm, “Electric Contacts, Theory and Applications”, 4th Edn (Springer-Verlag, New York, 1967) p. 13.Google Scholar
- 4.F. P. Bowden andD. Tabor, “The Friction and Lubrication of Solids, Part I” (Oxford University Press, London, 1950) pp. 26–28.Google Scholar
- 5.E. A. Burgemeister, V. Von Muench andE. Pettenpaul,J. Appl. Phys. 50 (1979) 5790.Google Scholar
- 6.V. R. Howes andP. Walls, unpublished work.Google Scholar