ISIJ International
Online ISSN : 1347-5460
Print ISSN : 0915-1559
ISSN-L : 0915-1559
Regular Article
Combustion Synthesis of TiC–Fe Composites under the Action of an Electric Field
Keqin FengChenguang BaiYi YangWenjuan WangFang Ji
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2007 Volume 47 Issue 5 Pages 648-651

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Abstract

Using thermal simulation equipment, the combustion synthesis process of the compact of 55wt%(Ti+C)–45wt%Fe was studied. The results show that the ignition temperature of Fe–Ti–C system can be decreased greatly under the action of electric field and great thermal density. Before heating up to 350°C, although there is no reaction takes place in the system, the microstructure of the system changes with the temperature; During heating from 350–470°C, a thermal explosion phenomenon appears. Especially in the earlier stage of the combustion reaction, the dominant reaction is the one synthesized TiC; As the temperature up to 670°C continuously, Ti(s)+C(s)=TiC(s) reaction takes place accompanying with 2Fe(s)+Ti(s)=Fe2Ti(s), and the conversion degrees of these reactions are increasing with the temperature increasing gradually. However, a part of Fe2Ti will be decompounded with the temperature increasing further, as a result, Ti(s)+C(s)=TiC(s) will go on because of the addition Ti. Consequently, the synthesized product consist of Fe, TiC and a little of Fe2Ti, and ultrafine TiC particles distribute in the Fe matrix uniformly.

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© 2007 by The Iron and Steel Institute of Japan
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