Journal article

Reaction kinetics in Ti3SiC2 synthesis studied by time-resolved neutron diffraction

E Wu, DP Riley, EH Kisi, RI Smith

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | ELSEVIER SCI LTD | Published : 2005

Abstract

The reactive sintering of 3Ti/SiC/C to form the ternary carbide Ti3SiC2, previously found to involve the intermediate phases TiCx and Ti5Si3 Cx, was investigated by time-resolved neutron powder diffraction. The kinetics of Ti3SiC2 formation from the intermediate phases TiCx, Ti5 Si3Cx (x ≤ 1) and a small amount of free C was determined. The crystallization rate of the Ti3SiC2 phase was determined through quantitative analyses of the diffraction patterns collected at different temperatures and is initially well-described by the Mehl-Avrami-Johnson equation. The activation energy was found to be 380 ± 10 kJ/mol and the Avrami exponent 3.0 ± 0.2. The Avrami exponent decreases to close to 1 when..

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