Effect of Al addition on the synthesis bulk material by pulse discharge sintering process

摘要

Ti_3SiC_2 bulk materials were synthesized from the starting powders of lTi/lSi/2TiC-xAl and 3Ti/lSiC/lC-xAl (molar ratios, x ranges from 0.05 to 0.15) at temperatures between 1100 and 1400 deg C for 15 min by pulse discharge sintering technique. X-ray diffraction and scanning electron microscopy were used to characterize the synthesized materials. It was found that the addition of Al decreases the content of TiC in the sintered samples and expands the optimal temperature range for the synthesis of Ti_3SiC_2 bulk materials. By addition of Al, Ti_3SiC_2 bulk materials of high phase-purity have been synthesized at 1100 and 1200 deg C from lTi/lSi/2TiC and 3Ti/lSiC/lC starting powders, respectively.