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Combustion synthesis of TiCx–TiB2 composites with hypoeutectic, eutectic and hypereutectic microstructures

✍ Scribed by Binglin Zou; Ping Shen; Zhongming Gao; Qichuan Jiang

Publisher
Elsevier Science
Year
2008
Tongue
English
Weight
657 KB
Volume
28
Category
Article
ISSN
0955-2219

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✦ Synopsis

Self-propagating high-temperature synthesis (SHS) of compacted blends of Ti, B 4 C and/or C powders was used to fabricate in situ TiC x -TiB 2 composites with different compositions. The microstructures of the resultant products were studied by X-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM), and the reaction sequence in the SHS reaction process was explored by quenching the combustion wavefront. The results showed that the TiC x -TiB 2 composites with 27.4, 36.7 and 61.7% TiB 2 in molar fractions display hypoeutectic, eutectic and hypereutectic microstructures, respectively, and TiC x is the leading phase in formation of the eutectic phase during solidification. Moreover, substoichiometric TiC x forms prior to TiB 2 in phase formation sequence even for the hypereutectic composition sample.

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