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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 11    No. 5    October 2001

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Effect of mechanical activation on
TiC synthesis reaction
in Al-Ti-C powder mixture
MA Nai-heng(马乃恒), LIANG Gong-ying(梁工英),
FANG Xiao-han(方小汉), SU Jun-yi(苏俊义)

School of Mechanical Engineering,
Xi′an Jiaotong University,Xi′an 710049, P.R.China

Abstract:After milling in a high-energy ball miller for various times, the synthesis reaction process of the Al-Ti-C powder mixture were investigated by difference thermal analysis (DTA) and X-ray diffractometry (XRD). According to the patterns of reaction peaks on the DTA curves, the activation energy of each reaction was calculated. The experimental results of DTA show that the synthesis reaction of Al-Ti-C powder mixture can be enhanced after high-energy milling. The longer the milling time, the lower the reaction temperature. The synthesis reaction of TiC is transformed from Ti+C→TiC to Al3Ti+C→TiC+3Al with long period milling. Meanwhile, the activation energy of the reaction reduces with increasing milling time. The effect of milling time on reduced activation energy for low temperature region is more significant than that for high temperature region.

 

Key words:  Al-Ti-C powder mixture; mechanical activation; reactive synthesis; activation energy

ISSN 1672-7029
CN 43-1423/U

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