OXIDATION, SCALE CRYSTALLIZATION, AND STRENGTH OF SIC FIBER AFTER OXIDATION IN AIR, STEAM, AND LOW PO_2

摘要

Fiber properties govern critical mechanical properties of ceramic matrix composites (CMCs). Oxidation impacts SiC fiber strength and therefore SiC-SiC CMC performance. More rapid and less costly CMC development and transition requires less reliance on empirical methods to quantify environmental effects like oxidation, and more reliance on physics-based mechanisms and models. This is particularly true for multi-year effects that cannot be easily characterized by experiment. Modeling of CMC properties requires accurate identification and modeling of oxidation mechanisms that affect CMC constituents, particularly fibers. Lack of basic data and mechanistic models for environmental effects on fiber properties inhibits understanding critical to advancement of CMC design and life management.