Dynamic Friction of SiC Surfaces: A Torsional Kolsky Bar Tribometer Study

Authors: Huang, H.; Feng, R.

Source: Tribology Letters, Volume 27, Number 3, September 2007 , pp. 329-338(10)

Publisher: Springer

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Abstract:

A dynamic tribometer has been successfully developed utilizing torsional Kolsky bar (TKB) technique for tribo pairs subjected to dynamic compression and shear. The dynamic tribometric responses of ground finish (R _a = 0.17 μm) and polished finish (R _a = 0.10 μm) surfaces of silicon carbide (SiC) under compression loading up to 1.5 GPa and shear-sliding velocity to 3.8 m/s have been measured. The experimental results show Coulomb friction behavior. Hardening of shear response is found on both the ground and polished surfaces. Repeating tests on the same tribo-pair demonstrate that steady state shear response on polished surfaces can be achieved by cumulating shear-sliding distance. SEM observation of the tested surface shows that the tested surfaces are microscopically shear-damaged. The similar surface conditions after a relative longer shear-sliding distance on polished surfaces lead to the same steady state frictional coefficient, 0.61, for both finishing surfaces.

Keywords: Test methods; Ceramics; Wear mechanisms; Contact mechanics; Friction traction; Shear strength

Document Type: Research article

DOI: http://dx.doi.org/10.1007/s11249-007-9239-4

Affiliations: 1: Email: hhuang4@rosharon.oilfield.slb.com

Publication date: 2007-09-01