The use of titanium aluminides to form electric-spark coatings


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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.

About the authors

S. A. Pyachin

Institute of Materials Science, Khabarovsk Research Center, Far East Division

Author for correspondence.
Email: pyachin@mail.ru
Russian Federation, ul. Tikhookeanskaya 153, Khabarovsk, 680042

T. B. Ershova

Institute of Materials Science, Khabarovsk Research Center, Far East Division

Email: pyachin@mail.ru
Russian Federation, ul. Tikhookeanskaya 153, Khabarovsk, 680042

A. A. Burkov

Institute of Materials Science, Khabarovsk Research Center, Far East Division

Email: pyachin@mail.ru
Russian Federation, ul. Tikhookeanskaya 153, Khabarovsk, 680042

N. M. Vlasova

Institute of Materials Science, Khabarovsk Research Center, Far East Division

Email: pyachin@mail.ru
Russian Federation, ul. Tikhookeanskaya 153, Khabarovsk, 680042

V. S. Komarova

Institute of Tectonics and Geophysics, Far East Division

Email: pyachin@mail.ru
Russian Federation, ul. Kim-Yu-Chena, Khabarovsk, 680000

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