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The effect of Al addition on the synthesis and resultant phase composition of Ti-Si-C ternary system was investigated. It was shown that Al addition decreased the synthesis temperature and shortened the soaking time of this system to promote the formation of Ti 3 SiC 2 . Resultant phases were identified by X-ray diffraction (XRD). The Ti-Al-C ternary compounds, Ti 3 AlC 2  and Ti 2 AlC, were not found except in case of raw powders containing sufficient Al. Ti 2 AlC was obtained after sintered at 1350 °C for 120 min. However, this phase vanished when the soaking time was extended to 180 min. Further extended soaking time,  i.e.  240 min yielded Ti 3 AlC 2  at the same temperature. To detect the trace of Al in the products without Ti 3 AlC 2  or Ti 2 AlC, scanning electronic microscope analysis (SEM) and plasma spectrochemical analysis were conducted. It was indicated that Ti 3 SiC 2  might be a Al-containing solution as Ti 3 (Si,Al)C 2 .

Effect of Al Addition on Synthesis of the Ti 3 SiC 2 by Vacuum Sintering