Effect of Properties of Titanium Aluminide Powders and Detonation Spraying Conditions on Phase and Structure Formation in Coatings

• Published in: Powder metallurgy and metal ceramics Vol. 44; no. 9-10; pp. 472 - 480
• Main Authors: Oliker, V E, Sirovatka, V L, Timofeeva, I I, Grechishkin, E F, Gridasova, T Ya
• Format: Journal Article
• Language: English
• Published: New York Springer Nature B.V 01-09-2005
• Subjects: Alloy powders; Alloys; Aluminum base alloys; Coatings; Detonation; Mechanical alloying; Metallurgy; Nanostructure; Titanium base alloys; Titanium compounds
• ISSN: 1068-1302; 1573-9066
• DOI: 10.1007/s11106-006-0012-2

We have studied phase formation in detonation coatings sprayed from Ti - 50 at. % Al powders. The powders of the alloy were obtained by various methods: crushing an ingot and mechanical alloying of Ti and Al. Using polyphase nanostructural materials activated by mechanical alloying makes the process of phase formation in the gas-thermal sprayed coatings based on them more general-purpose and controlled due to the more active and more subtle reaction of the material with the gaseous atmosphere. We have shown that from mechanically alloyed Ti - 50 at. % Al powder, using the detonation-gas spraying method we can consolidate a coating based on Al2TiO5 by oxidizing action of the working gas on the powder and also a coating based on titanium aluminides with TiN inclusions by nitriding action. The phase composition of the cast microstructural gamma-TiAl powder is inherited by the coating.