Combustion Synthesis: Filtration Combustion

通过燃烧直接合成高温材料可以根据反应物的相以不同的方式进行。当一种反应物是气体而另一种反应物是致密粉末时，这个过程称为过滤燃烧。固体-固体燃烧的各种分析和平面逆流模式的初步分析(即。（反应物气速和燃烧波向相反方向运动）已经完成。目前的研究将扩展到包括过滤燃烧的共流和扩散模式。此外，还将讨论以下主题：瞬态传播模式（稳定和不稳定），非绝热效应，两步动力学，反应物熔化效应，反应过程中的致密化，以及自适应伪谱方法在多维火焰传播数值模拟中的应用。自传播高温合成是一种新型的陶瓷和金属材料制备方法。作为美苏基础科学研究领域合作计划的一部分，该理论研究将与切尔诺戈洛夫卡结构宏观动力学研究所合作进行，将深入了解所涉及的复杂现象。结果将有助于解释过去观察到的行为，并设计未来必要的实验，使这一过程具有竞争力。

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.