Abstract
Mechanically activated sintering process has been employed to fabricate titanium silicon carbide (Ti 3SiC 2) powders by using the elemental powders of Ti, Si and C. Superfine powders were obtained after milling of both the powder mixtures with a stoichiometric composition and with an excess of 20 mol.% Si for only 1.5 h. The milled powders comprised TiC, Ti 3SiC 2 and silicides because a mechanically induced self-propagating reaction (MSR) was triggered during mechanical alloying. The aim of the extra-Si introduced to the starting composition is to study its effect on the formation of Ti 3SiC 2. High content of Ti 3SiC 2 has been obtained after sintering the milled powders at relatively low temperature of 1250 °C. Ti 3SiC 2 grains exhibit a fast growth behavior and various features in shape. A large amount of Ti 3SiC 2 whiskers have been found after sintering the milled powders with excess of Si at 1350 °C. The formation of Ti 3SiC 2 whiskers has relation to the appearance of eutectic liquid phases at that temperature.
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