The Use of Titanium Aluminides to Form Electric-Spark Coatings
S. A. Pyachina, *, T. B. Ershovaa, **, A. A. Burkova, ***,
N. M. Vlasovaa, ****, and V. S. Komarovab, *****Translated by N. Korovin
aInstitute of Materials Science, Khabarovsk Research Center, Far East Division, Russian Academy of Sciences,
ul. Tikhookeanskaya 153, Khabarovsk, 680042 Russia
bInstitute of Tectonics and Geophysics, Far East Division, Russian Academy of Sciences,
ul. Kim-Yu-Chena, Khabarovsk, 680000 Russia
Correspondence to: *e-mail: pyachin@mail.ru
Correspondence to: **e-mail: secretar@im.febras.net
Correspondence to: ***e-mail: burkovalex@mail.ru
Correspondence to: ****e-mail: vlasova64@yandex.ru
Correspondence to: *****e-mail: komarova@itig.as.khb.ru
Received 12 February, 2014
Abstract—Titanium aluminides (TiAl3, TiAl, Ti3Al) fabricated by powder metallurgy were used as alloying electrodes for the formation of electric-spark coatings. Intermetallic coatings were deposited on steel substrates in argon or nitrogen. The microstructure and composition of fabricated coatings were investigated by scanning electron microscopy, X-ray structural analysis, and electron probe microanalysis. It is established that initial Ti–Al intermetallic phases are present in fabricated coatings; however, the ratio between Ti and Al concentrations is shifted to aluminum compared with the stoichiometric one. When depositing titanium aluminide in the nitrogen medium, titanium nitride is additionally formed in surface layers. Thermal and tribotechnical tests showed that the Ti3Al coating deposited in nitrogen possesses high wear resistance and heat resistance.
Keywords: intermetallic compounds, titanium aluminides, electrospark alloying, coating, microhardness, heat resistance
DOI: 10.3103/S1067821216030135