Abstract
The article presents the results of tribological testing of a plasma-sprayed Al2O3, MgAl2O4 coating under sliding conditions without lubrication at a volume temperature of 20–600°C. The counterface materials were the alloys 316L(N)-IG, BrAZHNMts9-4-4-1 (aluminum bronze) used in the constriction of enhanced heat flux panels of the first wall and blanket module connectors of the ITER thermonuclear reactor. There was a significant increase in the friction coefficient and wear intensity at temperatures of T ≥ 250°C for both types of coatings. The main wear mechanism of oxide coatings was abrasive, which appeared after onset of brittle fracture and fatigue spalling areas on the surface coatings. Possible ways of reducing frictional forces in friction units with Al2O3, MgAl2O4 coatings are presented.
Similar content being viewed by others
REFERENCES
ITER Materials Assessment Report, ITER Document No. G74 MA 10 W 0.3, Saint-Paul-lès-Durance, 2004.
Toma, F.-L., Scheitz, S., Berger, L.-M., Sauchuk, V., Kusnezoff, M., and Thiele, S., Comparative study of the electrical properties and characteristics of thermally sprayed alumina and spinel coatings, J. Therm. Spray Technol., 2011, vol. 20, nos. 1–2, pp. 195–204.
Zaytzev, A.N., Alexandrova, Yu.P., and Yago-pol’skii, A.G., A comparative analysis of physical and mechanical properties of gas-thermal radiation-resistant electrical insulating coatings depending on the application method, Izv. Vyssh. Uchebn. Zaved., Mashinostr., 2018, no. 6, pp. 12–23.
Niemi, K., Hakalahti, J., Hyvarinen, L., Laurila, J., Vuoristo, P., Berger, L.-M., Toma, F.-L., and Shakhverdova, I., Influence of chromia alloying on the characteristics of APS and HVOF sprayed alumina coatings, Proc. ITSC 2011 Int. Thermal Spray Conf. and Exposition, September 27–29,2011, Hamburg, Düsseldorf: DVS Media, 2011, vol. 276, pp. 1–6.
Ouyang, J.H. and Sasaki, S., Tribological characteristics of low-pressure plasma-sprayed Al2O3 coating from room temperature to 800°C, Tribol. Int., 2005, vol. 38, pp. 49–57.
Bolelli, G., Cannillo, V., Lusvarghi, L., and Manfredini, T., Wear behavior of thermally sprayed ceramic oxide coatings, Wear, 2006, vol. 261, pp. 1298–1315.
Fadin, Yu.A., Kireenko, O.F., Kuznetsova, O.S., and Sychev, S.V., The initial stage of friction contact between brittle bodies, J. Frict. Wear, 2011, vol. 32, no. 3, pp. 227–229.
Borosov, Yu.S., Kharlam, Yu.A., Sidorenko, S.L., and Ardatovskaya, E.N., Gazotermicheskie pokrytiya iz poroshkovykh materialov: Spravochnik (Gas-Thermal Coatings from Powder Materials: Handbook), Kiev: Naukova Dumka, 1987.
Kiilakoski, J., Langlade, C., Koivuluoto, H., and Vuoristo, P., Characterizing the micro-impact fatigue behavior of APS and HVOF-sprayed ceramic coatings, Surf. Coat. Technol., 2019, vol. 371, pp. 245–254.
Zaitsev, A.N., Strebkov, Yu.S., Leshukov, A.Yu., Ivanov, V.M., Kuksenova, L.I., Sachek, B.Ya., Mezrin, A.M., and Aleksandrova, Yu.P., Assessment of critical level of shear stresses in tribocouples of Al2O3 and metal details of ITER blanket modules, J. Mach. Manuf. Reliab., 2016, vol. 45, no. 6, pp. 522–530.
Author information
Authors and Affiliations
Corresponding author
About this article
Cite this article
Zaytsev, A.N., Alexandrova, Y.P. Effect of Elevated Temperatures on Tribological Characteristics of a Plasma-Sprayed Al2O3 Coating under Sliding Conditions without Lubrication. J. Frict. Wear 41, 242–246 (2020). https://doi.org/10.3103/S1068366620030174
Received:
Revised:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.3103/S1068366620030174