Fluctuation synthesis and characterization of Ti3SiC2 powders

摘要

A novel fluctuation method for the synthesis of Ti3SiC2 powders was developed. The raw materials used in this process are Ti, Si, and graphite powders. Fluctuation synthesis utilized Si as in-situ liquid forming phase (additive), which was formed by heating the pow- der mixtures to 1300 deg.C and using the heat released from the exothermic reaction for Ti3SiC2 formation. The result demonstrated that the reaction time for the formation of TisSiCz was dramatically shortened using fluctuation method and the powders produced using this method contained more than twice amount of Ti3SiC2 compared to the solid reaction synthesized powders. The powders prepared by fluctuation method are fiber-like in mor- phology with dimensions of 0.8-2 pm in width and 5-1 0 pm in length. The growth direction of the fiber-like Ti3SiC2 particulate is { 1 0 1 1 } . The laitice parameters for TisSiCz were determined by a trial-and-error method and are a=3.067 A and c= 1 7.645 A.