Abstract
Titanium aluminides (TiAl3, TiAl, Ti3Al) fabricated by powder metallurgy are used as alloying electrodes for the formation of electrospark coatings. Intermetallic coatings are deposited on steel substrates in the argon or nitrogen medium. The microstructure and composition of fabricated coatings are investigated by scanning electron microscopy, X-ray structural analysis, and electron probe microanalysis. It is established that initial phases of Ti–Al intermetallic compounds are present in fabricated coatings, but the ratio between Ti and Al concentrations shifts towards aluminum compared with the stoichiometric one. When depositing titanium aluminides in nitrogen, 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.
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Schedule a callMore From: Izvestiya Vuzov. Poroshkovaya Metallurgiya i Funktsional’nye Pokrytiya (Proceedings of Higher Schools. Powder Metallurgy аnd Functional Coatings)
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