Combustion Synthesis of Nanocomposite Materials

纳米复合材料的燃烧合成

• 批准号: 0327962
• 负责人: Jan Puszynski
• 金额: --
• 依托单位: South Dakota School of Mines and Technology
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-09-01 至 2007-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0327962&HistoricalAwards=false
• 关键词: Combustion; Synthesis; Nanocomposite; Materials

SUMMARYThis study focuses on the effects of combustion conditions, various additives, and pre-processing steps on the formation of fully dense, graded, and random porous structures derived from nanopowdered reactants. The investigation covers the effects of particle size, mixing procedure, and the topology of the resulting particles in the reacting mixture on reaction kinetics and the microstructure of products. Several exothermic reactions have been selected for these studies including aluminum/titania, aluminum/niobia, aluminum/nickel, and aluminum/silicon/nitrogen. Both thermogravimetric analysis/differential scanning calorimetry (TGA/DSC) and nonisothermal techniques are used to evaluate reaction kinetics of these reactions. In addition, a new combustion diagnostic method using a gated, intensified CCD camera and a laser-induced breakdown spectroscopy (LIBS) instrument is used to analyze dynamic temperature profiles. Simultaneous combustion synthesis and uniaxial densification in systems consisting of reactive nanopowders, such as aluminum, silicon, nickel oxide, or niobia, is investigated. Comprehensive studies of the effect of protective coatings and other particle surface treatments on their reactivity, combustion wave characteristics, and the morphology of resulting products are performed. Also done are fundamental studies of the formation of nanostructural materials with graded composition and/or porosity. The dynamics of combustion processes in both volume combustion (VC) and self-propagating high-temperature synthesis (SHS) regimes in the presence of external forces and/or internal gasification of additives are modeled mathematically.Broader impact Experimental research studies, by development of new and faster response techniques, should lead to better understanding of reaction kinetics in condensed phase systems. In addition, the research should enhance the knowledge of the formation of structural materials under strongly non-isothermal conditions. Findings from these research studies should be beneficial to materials science, combustion, and reaction engineering communities. This project provides research opportunities for an existing REU Sites program that serves tribal colleges. It also underlies cooperative efforts with Germany and Poland.

总结本研究的重点是燃烧条件的影响，各种添加剂，和预处理步骤上形成的完全致密的，分级的，和随机的多孔结构来自纳米粉末反应物。研究了颗粒尺寸、混合过程、反应混合物中所得颗粒的拓扑结构对反应动力学和产物微观结构的影响。 已经选择了几种放热反应用于这些研究，包括铝/二氧化钛、铝/氧化铌、铝/镍和铝/硅/氮。 热重分析/差示扫描量热法（TGA/DSC）和非等温技术被用来评估这些反应的反应动力学。 此外，一种新的燃烧诊断方法，使用门控，增强CCD相机和激光诱导击穿光谱（LIBS）仪器被用来分析动态温度分布。 同时燃烧合成和单轴致密化系统组成的反应性纳米粉末，如铝，硅，氧化镍，或氧化铌，进行了研究。 全面研究了保护涂层和其他颗粒表面处理对其反应性、燃烧波特性和所得产品形态的影响。 还做了具有梯度组成和/或孔隙率的纳米结构材料的形成的基础研究。 在存在外力和/或添加剂内部气化的情况下，对体积燃烧（VC）和自蔓延高温合成（SHS）模式下的燃烧过程动态进行了数学建模。 实验研究，通过开发新的和更快的响应技术，应导致更好地了解凝聚相系统中的反应动力学。 此外，还应加强对强非等温条件下结构材料形成的认识。 这些研究的发现应该对材料科学，燃烧和反应工程界有益。 该项目提供了一个现有的REU网站程序，服务于部落学院的研究机会。 它也是与德国和波兰合作努力的基础。