| 电场对TiO2-C-Al系燃烧合成过程的影响 |
| |
| 引用本文： | 胡侨丹,罗蓬,严有为.电场对TiO2-C-Al系燃烧合成过程的影响[J].复合材料学报,2007,24(1):70-74. |
| |
| 作者姓名： | 胡侨丹 罗蓬 严有为 |
| |
| 作者单位： | 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; |
| |
| 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14mol、 外加电场强度E为25V/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(0.2~1.0μm), 在金属Al中分布均匀。
|
| 关 键 词： | 电场 TiO2-C-Al体系 燃烧合成 复合材料 致密性 |
| 文章编号： | 1000-3851（2007）01-0070-05 |
| 收稿时间： | 2006-03-12 |
| 修稿时间： | 2006-03-122006-06-01 |
Effect of an external electric field on the combustion synthesis process of TiO2-C-Al system |
| |
| HU Qiaodan,LUO Peng,YAN Youwei.Effect of an external electric field on the combustion synthesis process of TiO2-C-Al system[J].Acta Materiae Compositae Sinica,2007,24(1):70-74. |
| |
| Authors: | HU Qiaodan LUO Peng YAN Youwei |
| |
| Affiliation: | 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 |
| |
| 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 14mol in the system and the electric field strength E being 25V/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 0.2~1.0mm, and distribute uniformly in metal Al. |
| |
| Keywords: | electric-field TiO2-C-Al system combustion synthesis composite density |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
| 点击此处可从《复合材料学报》浏览原始摘要信息 |
|
点击此处可从《复合材料学报》下载全文 |
|
