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

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	Reaction kinetics in Ti3SiC2 synthesis studied by time-resolved neutron diffraction
	E. Wu; D. P. Riley; E. H. Kisi; R. I. Smith
	2005
发表期刊	Journal of the European Ceramic Society
ISSN	0955-2219
卷号	25 期号:15 页码:3503-3508
摘要	The reactive sintering of 3Ti/SiC/C to form the ternary carbide Ti3SiC2, previously found to involve the intermediate phases TiCx and Ti5Si3Cx, was investigated by time-resolved neutron powder diffraction. The kinetics of Ti3SiC2 formation from the intermediate phases TiCx Ti5Si3Cx (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 I when more than half of the crystallization process was completed. This indicates a change in the mechanism of Ti3SiC2 crystal growth from unrestricted two or three-dimensional growth in the a-b planes to one-dimensional growth only, due to interaction of the growing,disk-like crystals and cessation of growth in the preferred direction. (c) 2004 Elsevier Ltd. All rights reserved.
部门归属	univ newcastle, sch engn, callaghan, nsw 2308, australia. shenyang natl lab mat sci, shenyang 110016, peoples r china. rutherford appleton lab, isis facil, didcot ox11 0qx, oxon, england.;kisi, eh (reprint author), univ newcastle, sch engn, callaghan, nsw 2308, australia;erich.kisi@newcastle.edu.au
关键词	Sintering Carbides Kinetics Ti3sic2 Neutron Diffraction High-temperature Synthesis Powder Diffraction Phase-change Microstructure Nucleation Growth
URL	查看原文
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/35110
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	E. Wu,D. P. Riley,E. H. Kisi,et al. Reaction kinetics in Ti3SiC2 synthesis studied by time-resolved neutron diffraction[J]. Journal of the European Ceramic Society,2005,25(15):3503-3508.
APA	E. Wu,D. P. Riley,E. H. Kisi,&R. I. Smith.(2005).Reaction kinetics in Ti3SiC2 synthesis studied by time-resolved neutron diffraction.Journal of the European Ceramic Society,25(15),3503-3508.
MLA	E. Wu,et al."Reaction kinetics in Ti3SiC2 synthesis studied by time-resolved neutron diffraction".Journal of the European Ceramic Society 25.15(2005):3503-3508.