Synthesis and Decomposition of Ti₃SiC₂ under 1-5GPa at 1400°C

Abstract:

Ternary carbide Ti₃SiC₂ is a good binder to make superhard composites with diamonds or cubic boron nitride. Superhard composites are normally made at high temperature and under high pressure around 5 GPa to avoid the phase transformation of diamonds or cubic boron nitride. This paper researched the synthesis of Ti₃SiC₂ from the powders of Ti, Si, and graphite by a cubic presser under 1 GPa to 4 GPa at 1400°C. The decomposition of Ti₃SiC₂ under 5GPa at 1400°C was also researched. From X-ray diffraction (XRD) and scanning electron microscopy (SEM) results, Ti₃SiC₂ was synthesized in 30 min under 1 GPa at 1400°C. The impurities were TiSi₂, Ti₅Si₃C_x, and TiC. As the pressure increased from 1GPa to 4GPa, less Ti₃SiC₂ more TiSi₂ was synthesized. Therefore, high presser > 1GPa is unfavorable for the synthesis of Ti₃SiC₂. After treated under 5GPa at 1400°C, pure Ti₃SiC₂ was decomposed.

• Periodical: Key Engineering Materials (Volumes 602-603)
• Pages: 499-502
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.602-603.499
• Online since: March 2014
• Authors: Yuan Yuan Zhu, Shang Sheng Li, Liang Li, Ai Guo Zhou*
• Keywords: Decomposition, HPHT, Synthesis, Ti₃SiC₂

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