Gaseous and Aqueous Corrosion of Ceramics

本研究研究了陶瓷腐蚀的两个领域，气态反应与挥发性物质的产生和水溶动力学。目的是确定每种情况下的降解机制和速率控制步骤。可能的机制范围从输运控制到表面反应动力学。研究了多组分体系氧化过程中微观结构的退化。气体腐蚀动力学用热重法测定，溶解动力学用原子吸收光谱法测定。%%%%本研究旨在研究控制陶瓷腐蚀行为的基本原理。从降解机理出发，可以制备出更好的陶瓷，使降解最小化。它们还可以为在给定的恶劣环境中选择最佳陶瓷材料提供依据。结果也可用于陶瓷加工。

This research investigates two areas of ceramic corrosion, gaseous reactions with the production of volatile species and aqueous dissolution kinetics. The objective is to determine the degradation mechanism and the rate-controlling steps in each case. The range of possible mechanisms spans from transport control to surface reaction kinetics. Degradation of microstructure during the oxidation of multi-component systems will be investigated. Gaseous corrosion kinetics are determined by thermogravimetry, and dissolution kinetics are determined by solution analysis with atomic absorption spectroscopy. %%%% This research seeks to study the fundamentals governing the corrosion behaviors of ceramics. From the degradation mechanism, better ceramics can be fabricated to minimize degradation. They can also provide basis for the selection of an optimum ceramic material for a given hostile environment. Results may also be useful with respect to ceramic processings.