Combustion Synthesis: Filtration Combustion

高温材料的直接合成 燃烧可以以不同的方式进行，这取决于 反应物的相。 当一种反应物是气体， 另一种是致密的粉末，这一过程称为过滤 燃烧 对固-固燃烧的各种分析和对 平面逆流模式的初始分析（即，的 反应气速度与燃烧波方向相反 方向）已经完成。 目前的研究 将扩展到包括同向流动和扩散 过滤燃烧模式。 此外，以下 将讨论的主题：传播的瞬态模式 （稳定和不稳定），非绝热效应，两步 动力学，反应物熔化的影响，致密化 在反应过程中，自适应伪谱的应用 多维火焰数值模拟方法 传播 自蔓延高温合成是一种创新的 陶瓷和金属材料的制造方法。 的 理论研究，将与 切尔诺戈洛夫卡结构宏观动力学研究所， 美苏在基础科学领域的合作 研究计划，将产生深入了解复杂的 涉及的现象。 这些结果将有助于解释过去 观察到的行为和设计未来必要的实验 使这个过程具有竞争力。

The direct synthesis of high temperature materials by combustion can proceed in different fashion depending upon the phases of the reactants. When one reactant is a gas and the other is a compact powder, the process is termed filtration combustion. Various analyses of solid-solid combustion and an initial analysis of the planar counter-flow mode (ie., the reactant gas velocity and the combustion wave move in opposite directions) have already been completed. The current research will extend this to include the co-flowing and diffusional modes of filtration combustion. Additionally, the following topics will be addressed: transient modes of propagation (stable and unstable), nonadiabatic effects, two-step kinetics, effects of melting of the reactant, densification during reaction, and application of adaptive pseudospectral methods to numerically modelling multi-dimensional flame propagation. Self-propagating high temperature synthesis is an innovative method for fabrication of ceramic and metallic materials. The theoretical study, to be performed in collaboration with the Chernogolovka Institute of Structural Macrokinetics as part of the US-USSR Cooperation in the Field of Basic Scientific Research Program, will yield insight into the complex phenomena involved. The results will aid in explaining past observed behavior and designing future experiments necessary to make the process competitive.