LI Xiaoxuan, SUN Hexin, WANG Chunxiao, ZHU Chuncheng

(College of Chemistry and Chemical Engineering, Harbin Normal University, Harbin 150025, Heilongjiang, China)

Abstract: The ternary ceramic Ti₂SC powders were synthesized by self-propagation high-temperature synthesis with different samples from Ti, S, C and TiC powder mixtures. The results showed that Ti₂SC was the main phase of the product of the Ti-S-C/TiC systems, but small amounts of TiC and Ti₃S₄ exist in the synthesized sample. The sample only has Ti₂SC and TiC when the TiC content is 1.05 mol. The reaction mechanism for synthesizing Ti₂SC has been proposed, which implicates that in the Ti-S-C/TiC reaction system, firstly, Ti reacts with S to form Ti-S liquid, then Ti reacts with C to form TiC; liquid Ti-S reacts with TiC to form Ti₂SC. Mixing TiC in raw materials prevents the thermal explosion during the synthesis of Ti₂SC.

Key words: Ti₂SC; TiC; self-propagation high-temperature synthesis; synthesis reaction mechanism; layered structures