Diffusion controlled process in shock-densified Ti+0.95C green compacts

被引：0
|
作者：
Jong-Heon Lee
Naresh N. Thadhani
机构：
[1] Kumamoto University,High Energy Rate Lab, Faculty of Engineering
[2] Georgia Institute of Technology,School of Matls Sci. and Eng.
来源：
Metals and Materials | 1998年 / 4卷
关键词：
shock-densification; TiC synthesis; diffusion controlled process; avrami kinetics;
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学科分类号：
摘要：
The effect of combination of “shock-densification” and “reaction synthesis” was investigated to synthesize titanium carbide ceramics. Elemental titanium and graphitic carbon powder mixtures were shock-compressed to make Ti+0.95C compacts (~88±2% dense) for subsequent reaction synthesis experiments which were performed in an induction-heated hot press at temperature of 1000-1300° with constant hold time of 60 minutes and a nominal pressure of 34.5 MPa (5000 psi). Experimentally determined titanium carbide formation rates (measured based on depletion of elemental Ti) revealed that the reaction layer growth is controlled by a defect-enhanced diffusion process following the Avrami kinetics, forming a non-stoichiometric TiC0.35–0.58 compound.
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页码：676 / 679
页数：3
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