Abstract
The effect of adhesive activation of polytetrafluoroethylene (PTFE) powder by sodium ammonia solution on the structure and tribological behavior of sintered polymer is studied. The friction coefficient of the adhesion-activated PTFE (PTFE-A) increases, while the rate of wear decreases compared to the original PTFE by about 50-fold on friction against 40X13 stainless steel and by up to 800-fold on friction against 40X chromium steel. The difference is attributed to the dependence of the rate of wear on activation of the tribochemical mechanism, which is responsible for chemisorption of the transfer film on the metal counterface and increases its life, wear resistance and, eventually, the wear resistance of PTFE-A. When the friction conditions preclude its activation (friction against 40X13 stainless steel), the modest improvement in wear resistance is achieved through increased intermolecular interaction in PTFE-A. On friction against corrosion-active 40X steel, an iron oxide layer facilitates chemisorption of the transfer film providing for additional reduction in the wear rate by more than an order of magnitude. Functionalization of PTFE-A also inhibits the dependence of the wear rate on the relative humidity of the surrounding atmosphere observed during friction of some PTFE-based composites, which may be useful for practical applications.
Similar content being viewed by others
REFERENCES
Makinson, K. and Tabor, D., Friction and transfer of polytetrafluoroethylene, Nature, 1964, vol. 201, no. 491, pp. 464–476.
Tanaka, K., Uchiyama, Y., and Toyooka, S., The mechanism of wear of polytetrafluoroethylene, Wear, 1973, vol. 23, no. 2, pp. 153–172.
Blanchet, T. and Kennedy, F., Sliding wear mechanism of polytetrafluoroethylene (PTFE) and PTFE composites, Wear, 1992, vol. 153, no. 1, pp. 229–243.
Benderly, A.A., Treatment of teflon to promote bondability, J. Appl. Polym. Sci., 1962, vol. 6, no. 20, pp. 221–225.
Brewis, D.M., Mathieson, I., Sutherland, I., and Cayless, R.A., Adhesion studies of fluoropolymers, J. Adhes., 1993, vol. 41, pp. 113–128.
Ye, J., Burris, D.L., and Xie, T., A review of transfer films and their role in ultra-low-wear sliding of polymers, Lubricants, 2016, vol. 4, no. 4, p. 4.
Kerber, S.J. and Tverberg, J., Stainless steel surface analysis, Adv. Mater. Process., 2000, vol. 158, no. 5, pp. 33–36.
Krick, B.A., Ewin, J.J., Blackman, G.S., Junk, C.P., and Sawyer, W.G., Environmental dependence of ultra-low wear behavior of polytetrafluoroethylene (PTFE) and alumina composites suggests tribochemical mechanisms, Tribol. Int., 2012, vol. 51, pp. 42–46.
Harris, K. L., Pitenis, A.A., Sawyer, W.G., Krick, B.A., Blackman, G.S., Kasprzak, D.J., and Junk, C.P., PTFE tribology and the role of mechanochemistry in the development of protective surface films, Macromolecules, 2015, vol. 48, no. 11, pp. 3739–3745.
Krick, B.A., Pitenis, A.A., Harris, K.L., Junk, C.P., Sawyer, W.G., Brown, S.C., Rosenfeld, H.D., Kasprzak, D.J., Johnson, R.S., Chan, C.D., and Blackman, G.S., Ultralow wear fluoropolymer composites: Nanoscale functionality from microscale fillers, Tribol. Int., 2016, vol. 95, pp. 245–255.
Burris, D.L. and Sawyer, W.G., Improved wear resistance in alumina-PTFE nanocomposites with irregular shaped nanoparticles, Wear, 2006, vol. 260, pp. 915–918.
Aderikha, V.N., Krasnov, A.P., Naumkin, A.V., and Shapovalov, V.A., Effects of ultrasound treatment of expanded graphite (EG) on the sliding friction, wear resistance, and related properties of PTFE-based composites containing EG, Wear, 2017, vols. 386–387, pp. 63–71.
Author information
Authors and Affiliations
Corresponding author
Additional information
Translated by E. Boltukhina
About this article
Cite this article
Aderikha, V.N., Novikov, V.P., Filippovich, S.R. et al. The Effect of PTFE Powder Adhesive Activation on the Wear Resistance of Block PTFE. J. Frict. Wear 39, 355–360 (2018). https://doi.org/10.3103/S1068366618050021
Received:
Published:
Issue Date:
DOI: https://doi.org/10.3103/S1068366618050021