CAREER: Reaction-Based Processing of High Temperature Materials

这个职业项目的研究和教育目标集中在高温下使用的基于反应的多相材料的加工。为了研究基于反应的工艺的不同方面，已经概述了四个不同的研究项目：1)利用原位反应来调整陶瓷-金属系统中的界面化学；2)确定陶瓷-金属系统中的反应机理；3)计算和实验验证超高温陶瓷系统中的相平衡图；以及4)开发新的锆基陶瓷加工路线。综上所述，这些项目将提供新的加工路线，更好地控制微观结构，改进对反应机理的了解，并从根本上了解高温材料的相稳定性。这一成果将有利于政府和行业开发新的航空航天器和其他在极端环境中运行的系统。高温材料也将作为教育活动的重点，包括对密苏里-罗拉大学四名研究生和最多十名本科生的直接培训，以及针对所有陶瓷工程本科生的职业发展活动。将热量转化为有用工作的系统(如发电厂、内燃机)的效率可以通过提高运行温度来提高。建造这些系统所用的材料限制了最高工作温度。当在高温下使用时，材料必须稳定，不与其他材料反应，并且必须抵抗内部物理变化，这些变化可能会随着时间的推移而改变性能。该项目将通过增加对高温系统中加工-显微结构-性能关系的基本了解来解决对改进高温材料的迫切需求。该项目还将促进本科生和研究生在这一领域的潜在职业培训。

The research and educational objectives of this CAREER project focus on the reaction-based processing of multi-phase materials designed for use at elevated temperatures. Four different research projects have been outlined to investigate different aspect of reaction-based processing: 1) use of in situ reactions to tailor the interfacial chemistry in ceramic-metal systems; 2) determination of reaction mechanisms in ceramic-metal systems; 3) calculation and experimental verification of phase equilibrium diagrams in ultra-high temperature ceramic systems; and 4) development of new routes for the processing of Zr-based ceramics. Taken together, these projects will provide new processing routes, better control of microstructure, improved knowledge of reaction mechanisms, and a fundamental understanding of phase stability in high temperature materials. The results will benefit government and industry development of new aerospace vehicles and other systems that operate in extreme environments. High temperature materials will also serve as the focus for educational activities that include the direct training of four graduate students and up to ten undergraduates as well as professional development activities for all Ceramic Engineering undergraduates at University of Missouri-Rolla.The efficiency of systems that convert heat into useful work (e.g., electrical power plants, internal combustion engines) can be increased by increasing the operating temperatures. The materials used to construct these systems limit the maximum operating temperature. When used at elevated temperatures, materials must be stable against reaction with other materials and must be resistant to internal physical changes that can alter performance over time. This project will address the critical need for improved high temperature materials by increasing the fundamental understanding of processing-microstructure-property relations in high temperature systems. The project will also facilitate the training of undergraduate and graduate students for potential careers in this field.