Dynamic Synthesis and Processing of High Temperature Materials

这项研究有三个与动态应力应用和高速化学反应相关的主要重点领域：(1)冲击波诱导的化学反应(通过受控恢复实验、力学模拟和时间分辨反应速率测量)和新型和亚稳态材料的合成：(2)粉末的动态压实以形成金属、金属间化合物和陶瓷基复合材料；(3)在粉末混合物中通过自蔓延化学反应进行燃烧处理，然后进行高能率致密化和反应烧结。这项研究是在新墨西哥理工大学进行的。(冲击波诱导的化学反应和合成)，Los Alamos(模拟)，Sandia(冲击波设施，模拟)，加州。安装理工学院。(冲击-复合材料界面反应的剪裁)和UC-圣地亚哥(燃烧合成、动态致密化和激波后处理)。%这是一个很好的研究领域，研究具有生产新材料的能力，具有潜在的高回报。需要对工艺变量进行建模，以便将工艺放大到更大的尺寸和更复杂的形状。

This research has three principal focal areas connected with the theme of dynamic stress application and high rate chemical reactions, as follows: (1) shock-induced chemical reactions (with controlled recovery experiments, mechanistic modeling, and time- resolved reaction-rate measurements) and synthesis of novel and metastable materials; (2) dynamic compaction of powders to form metal-, intermetallic-, and ceramic-matrix composites; controlled shock-induced and post-shock thermally-induced reactions to tailor and optimize matrix-reinforcement interface characteristics; (3) combustion processing by self-propagating chemical reactions in powder mixtures, followed by high energy rate densification and reaction sintering. The research is performed at New Mexico Tech. (shock-induced chemical reactions and synthesis), Los Alamos (modeling), Sandia (shock-wave facilities, modeling), Cal. Inst. of Tech. (shock-tailoring of interfacial reactions in composites), and UC-San Diego (combustion synthesis, dynamic densification and post- shock processing) . %%% This is an excellent area of research, where the research has potentially high pay-off with the capability to produce new materials. Modeling of the process variables is needed to permit the scaling up of the process to larger sizes and more complex shapes.