Dynamic Synthesis and Processing of High Temperature Materials

本研究围绕动态应力应用和高速率化学反应这一主题，有以下三个主要重点领域：(1)冲击诱导化学反应（通过控制恢复实验、机理建模和时间分辨反应速率测量）和新型亚稳材料的合成；(2)粉末的动态压实形成金属基、金属间基和陶瓷基复合材料；控制冲击诱导和冲击后热诱导反应，调整和优化基体-增强界面特性；(3)通过粉末混合物中自传播的化学反应进行燃烧处理，随后进行高能量速率致密化和反应烧结。这项研究是在新墨西哥理工学院（冲击波诱导的化学反应和合成）、洛斯阿拉莫斯（建模）、桑迪亚（冲击波设施，建模）、加州理工学院（复合材料界面反应的冲击剪裁）和加州大学圣地亚哥分校（燃烧合成、动态致密化和冲击后处理）进行的。这是一个很好的研究领域，研究有可能产生高回报的新材料。需要对过程变量进行建模，以便将过程扩展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.