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H. Li, L.M. Peng, M. Gong, J.H. Zhao, L.H. He

Effect of Al Addition on Synthesis of the Ti₃SiC₂ by Vacuum Sintering

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 Ti₃SiC₂. Resultant phases were identified by X-ray diffraction (XRD). The Ti-Al-C ternary compounds, Ti₃AlC₂ and Ti₂AlC, were not found except in case of raw powders containing sufficient Al. Ti₂AlC 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 Ti₃AlC₂ at the same temperature. To detect the trace of Al in the products without Ti₃AlC₂ or Ti₂AlC, scanning electronic microscope analysis (SEM) and plasma spectrochemical analysis were conducted. It was indicated that Ti₃SiC₂ might be a Al-containing solution as Ti₃(Si,Al)C₂.

Zeitschrift für Physikalische Chemie, Oldenbourg Wissenschaftsverlag

Print ISSN: 0942-9352
Volume: 219, 10/2005
Pages: 1411 - 1420

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