Rapid and direct reactive synthesis of Ti–Al intermetallics by microwave heating of TiH2 and Al powder without microwave susceptor

TiAl and TiAl3 titanium aluminide intermetallic compounds are synthesized directly within a few ten seconds by microwave technique. An initial mixture of TiH2 and Al powders has been used. Such mixture avoids the use of a microwaves susceptor. The hydrogen desorbed during the experiment keep the mix...

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Bibliographic Details
Published in:Journal of alloys and compounds 2017-10, Vol.720, p.182-186
Main Authors: Awad, A.S., Merheb, D., Zakhour, M., Nakhl, M., Bobet, J.-L.
Format: Article
Language:English
Subjects:
Aluminum
Chemical Sciences
Chemical synthesis
Hydrogen-based energy
Intermetallic compounds
Material chemistry
Microwaves
Microwaves heating
Oxidation
Reactive synthesis
Titanium aluminides
Titanium base alloys
Titanium compounds
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Summary:TiAl and TiAl3 titanium aluminide intermetallic compounds are synthesized directly within a few ten seconds by microwave technique. An initial mixture of TiH2 and Al powders has been used. Such mixture avoids the use of a microwaves susceptor. The hydrogen desorbed during the experiment keep the mixture in a reductive atmosphere thus avoiding possible oxidation. The role of TiH2 is then: (i) to act as a microwave absorber, (ii) to provide a reductive atmosphere and (iii) to provide energy through the hydrogen release reaction. The formation of the various intermetallics has been highlighted by X-ray diffraction and EPMA analysis. •TiAl and TiAl3 are synthesized directly within a few ten seconds by microwave technique.•TiH2 acts as a microwave absorber.•TiH2 provides a reductive atmosphere and energy through the hydrogen release.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2017.05.176