电场对TiO<sub>2</sub>-C-Al系燃烧合成过程的影响

胡侨丹; 罗蓬; 严有为

电场对TiO₂-C-Al系燃烧合成过程的影响

1.
华中科技大学塑性成形模拟及模具技术国家重点实验室, 武汉 430074;
2.
江南大学机械工程学院, 无锡 214122

基金项目: 国家自然科学基金资助项目(50574042)

详细信息

通讯作者:
严有为, 博士, 教授, 主要从事SHS技术及原位复合材料方面的研究 E-mail: yanyw@mail.hust.edu.cn

中图分类号: TB331
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出版历程
- 收稿日期: 2006-03-11
- 修回日期: 2006-05-31
- 刊出日期: 2007-02-14

Effect of an external electric field on the combustion synthesis process of TiO₂-C-Al system

1.
State Key Laboratory of Plastic Forming Simulation and Die & Mould Technology, Huazhong University of Science and Technology, Wuhan 430074, China;
2.
School of Mechanical Engineering, Southern Yangtze University, Wuxi 214122, China

More Information

Corresponding author:
YAN Youwei

摘要

摘要: 以3TiO₂+3C+(4+x)Al反应体系为对象, 直接燃烧合成致密的TiC-Al₂O₃-Al复合材料。着重研究了电场对该体系燃烧合成过程的影响。结果表明: 外加电场的焦耳热效应可提高体系的绝热燃烧温度, 从而突破燃烧合成反应的热力学限制; 电场可改变体系的燃烧合成反应的模式; 随着电场强度的增加, 自蔓延燃烧温度和速度均提高, 而合成材料组织中Al₂O₃和TiC晶粒尺寸逐渐减小; 当体系中过余Al量x为14mol、外加电场强度E为25V/cm时, 可直接燃烧合成相对致密性为92.5%的TiC-Al₂O₃-Al复合材料, 且合成的Al₂O₃和TiC晶粒尺寸细小(0.2~1.0μm), 在金属Al中分布均匀。
- 电场 /
- TiO₂-C-Al体系 /
- 燃烧合成 /
- 复合材料 /
- 致密性
Abstract: Taking 3TiO₂+3C+(4+x)Al as a reaction system, a dense TiC-Al₂O₃-Al composite was directly prepared. The effect of electric-field on the combustion synthesis process of the system was systematically investigated. The results show that the imposition of an external electric field can improve the adiabatic temperature of the reactive system and induce its self-sustaining combustion synthesis process. The electric field also can change the combustion modes of the system. With an increase of the field strength, both the combustion temperature and the self-propagating wave velocity are increased obviously, while the grain size of the in-situ synthesized TiC and Al₂O₃ particles is decreased significantly. Under the conditions of the Al residual x being 14mol in the system and the electric field strength E being 25V/cm, a dense TiC-Al₂O₃-Al composite with a relative density of 92.5% can be successfully fabricated, in which TiC and Al₂O₃ particles have a fine size of 0.2~1.0mm, and distribute uniformly in metal Al.
- electric-field /
- TiO₂-C-Al system /
- combustion synthesis /
- composite /
- density