Investigation of Field-Activation in Combustion Synthesis: The Use of Field as a Processing Parameter

燃烧合成中场激活的研究：使用场作为处理参数

• 批准号: 9616768
• 负责人: Zuhair Munir
• 金额: $ 33.84万
• 依托单位: University of California-Davis
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-04-01 至 2000-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9616768&HistoricalAwards=false
• 关键词: Investigation; Field; Activation; Combustion; Synthesis

ABSTRACT CTS-9616768 This study is an investigation of the use of electric fields in self - propagating high-temperature (combustion) synthesis (SHS). It builds on previous work to develop an understanding of the interactions between electromagnetic fields and self-sustaining combustion waves. The focus is on the macrokinetics of wave propagation in the presence of a field and on microstructural developments within the combustion zone. Models and experiments are used to study field activation as a function of thermophysical properties of reactants and products. Relationships of interest include the effects of the field on the velocity and temperature of the combustion wave, on phase transformation, and on modal change (steady/nonsteady state) in wave propagation. The effect of the field on the mechanism of combustion is investigated using the Boddington-Laye analysis of temperature profiles and compared to experimental observations on profiles in the combustion zone. The results are extended to determine the effect of the field on compositional distribution in functionally-graded materials. Incorporated into this study are collaborations with two Italian research groups. Dr. Umberto Anselmi-Tamburini of Pavia will participate in the study of field effects on the kinetics and mechanisms of the combustion process. Dr. Giacomo Cao of Cagliari will be involved in studies of formation of intermetallic compounds by SHS. Understanding the interactions between electric fields and self-propagating combustion systems will enable the use of the field as a processing parameter in the synthesis and consolidation materials. ***

摘要CTS-9616768 本文研究了电场在自蔓延高温（燃烧）合成（SHS）中的应用。 它建立在以前的工作，发展电磁场和自我维持的燃烧波之间的相互作用的理解。 重点是宏观动力学的波传播的存在下，一个领域和微观结构的发展在燃烧区。 模型和实验被用来研究场激活作为反应物和产物的热物理性质的函数。 感兴趣的关系包括燃烧波的速度和温度，相变，和波传播中的模式变化（稳态/非稳态）上的字段的效果。 使用Boddington-Laye分析的温度分布和燃烧区的实验观察相比，对燃烧机制的字段的效果进行了研究。 扩展的结果，以确定功能梯度材料中的成分分布的字段的效果。 这项研究与两个意大利研究小组合作。 帕维亚的翁贝托·安塞尔米·坦布里尼博士将参加对燃烧过程的动力学和机制的场效应的研究。 卡利亚里的Giacomo Cao博士将参与SHS形成金属间化合物的研究。 了解电场和自蔓延燃烧系统之间的相互作用，将使电场作为合成和固结材料的工艺参数。 ***