Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.13/33978

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Title
Synthesis and characterization of SHS bonded Ti₅Si₃ on Ti substrates
Author/Creator
Riley, D. P.
Institution
The University of Newcastle. Faculty of Science & Information Technology, School of Environmental and Life Science
Description
The simultaneous synthesis and bonding of titanium silicide, Ti₅Si₃, to pure Ti has been investigated using self-propagating high-temperature synthesis (SHS). Ti and Si reactants were ignited in a self-sustaining reaction, liberating sufficient heat to first synthesize then bond Ti₅Si₃ to a Ti substrate. Scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) were used to characterize the bond interface, while phase identification was performed using X-ray diffraction (XRD). The bond interface was shown to contain a uniform and continuous eutectic region, approximately 75 μm thick. Using back-scattered electron (BSE) imaging and quantitative phase analysis (QPA), the coating overlay was shown to consist of a two-phase mixture of 97 wt% Ti₅Si₃ with 3 wt% Ti segregated to the silicide grain-boundaries. It is proposed that the overall reaction sequence was initiated by the rapid SHS reaction, 5Ti + 3Si → Ti₅Si₃ + ΔHf = -579 Kj/mol prior to a secondary reaction with the Ti substrate in which the eutectic region was formed.
Relation
Intermetallics Vol. 14, Issue 7, p. 770-775
Publisher Link
http://dx.doi.org/10.1016/j.intermet.2005.11.009
Date
2006
Publisher
Elsevier Ltd.
Keyword(s)
titanium silicides;  bonding;  coatings, intermetallic and otherwise;  reaction synthesis;  diffraction
Resource Type
journal article
Identifier
http://hdl.handle.net/1959.13/33978
Identifier
ISSN:0966-9795
Reviewed
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Subject
"Intermetallics"
 
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