International Scientific Conference BALTTRIB, 2017

THE TRIBOLOGICAL PROPERTIES OF PTFE MODIFIED WITH CHALCOPYRITE

D. Gventsadze, E. Kutelia, L. Nadaraia, J. Padgurskas, L. Gventsadze, O. Tsurtsumia
R.Dvali Institute of Machine Mechanics, Tbilisi, Georgia; Republic Center for Structure Research, Georgian Technical University, Tbilisi, Georgia; Aleksandras Stulginskis University, Kaunas, Lithuania; Republic Center for Structure Research, Georgian Technical University, Tbilisi, Georgia

Abstract

In present work it has been studied the physical-mechanical and tribological properties of the compositional material which was obtained in the PTFE base with chalcopyrite fine dispersed concentrate as fillers. The PTFE-chalcopyrite composites were prepared by powder metallurgy route containing chalcopyrite particles (2.5, 5 and 10 wt %). The tests have been performed in the friction machine under 0.7 MPa load where as a counterpart the gray cast iron was used. From the beginning, the weight wear was measured after passing some velocity steps (0.25–1.25 m/sec). The worn surfaces of the tested composites and the cast iron samples after working as a tribological pair were analyzed using SEM/EDX methods. The obtained results have shown that the incorporation of optimal quantity (~5 wt %) chalcopyrite particles into PTFE matrix drastically (>102 times) improves the wear resistance comparatively to the unfilled PTFE in the 0.25–1.25 m/sec friction velocity range. In the same testing conditions by the analysis of the obtained results it is determined that at the low velocity friction (<1 m/sec) the newly developed composite material has 10–15 times lower wear intensity than the best existing tribo–technical purpose commercial material “superfluvis”, therefore the obtained composite can be considered as a quite inexpensive and efficient tribological material.

 

DOI: https://doi.org/10.15544/balttrib.2017.13

Keyword(s): self-lubricating composite materials, friction coefficient, polytetrafluorethylene, chalcopyrite, wear intensity.


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