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1 2007

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Self-spreading high-temperature synthesis of TiB2 powder

Shahbahrami B., Sarraf Maamoori R., Ehsani N.

Materials Science Poland

2007

Vol. 25, No. 3

719--731

TiB2/Al2O3 powder composite was synthesized via simultaneous aluminum reduction of TiO2 and B2O3 according to self-spreading high temperature (SHS) reaction in an oxidizing atmosphere. Using controlled atmosphere and high temperature is not necessary in this method. Based on the Taguchi experimental technique, various experiments were carried out and some characteristic parameters were determined. Due to the formation of intermolecular phases between Al2O3 and CaO which are soluble in HCl, CaO powder was added to the starting materials to make pure TiB2. The most appropriate powder was obtained from the materials of stoichiometric composition, purified with an optimum amount of HCl. Characteristics of the produced samples were studied with X-ray diffraction, atomic absorption spectroscopy and particle size analysis.