Coatings of Aluminide Intermetallic Compounds on Steel Utilizing a Hybrid Technique of Spraying and IR-Laser Fusion

1 May 1994

journal article
research article
Published by Taylor & Francis in Materials and Manufacturing Processes

Vol. 9 (3) , 493-505
https://doi.org/10.1080/10426919408934920

Abstract

Titanium aluminide coatings were produced using a hybrid technique of arc-spraying followed by IR-laser fusion in an argon atmosphere. A titanium coating free of oxides was deposited onto a low-alloy steel by DC-arc spraying in argon. Optimal laser irradiation conditions and the amount of preplaced aluminum powder on the sprayed titanium were determined to obtain a composite coating of TiAl₃+Al of 150 urn thickness. Metallurgical and mechanical properties were examined using acoustic emission. The oxidation resistance of the coating was excellent up to 1173 K because of a protective alumina layer. Growth of the TiAl₃interlayer by diffusion of aluminum into titanium improved the corrosion resistance. The intermetallic coadng showed microcracking at ambient temperature, but possessed capability for filling and healing of cracks with alumina and titanium nitride during high-temperature exposures. However, at temperatures higher than 1200 K, the oxidation performance decreased by diffusion of iron into the coating

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