About this Abstract |
Meeting |
MS&T22: Materials Science & Technology
|
Symposium
|
High Temperature Oxidation of Metals and Ceramics
|
Presentation Title |
New Approaches to Study Oxygen Transport in SiC-based Ceramic Matrix Composites |
Author(s) |
Koen JH Verrijt, David L Poerschke |
On-Site Speaker (Planned) |
Koen JH Verrijt |
Abstract Scope |
Matrix microstructure heterogeneity in SiC ceramic matrix composites (CMCs) arises in various processing routes. Polymer infiltration and pyrolysis can lead to a spatial variability in composition and crystallinity, residual amorphous phases, and porosity - all at the nanometer scale. It is important to understand the influence of these fine-scale features on oxygen transport to enable better materials and processing protocols designed to limit oxygen transport and to increase CMC lifetimes. The use of polymer-derived ceramics allows for tailoring these microstructural heterogeneities by varying the polymer precursor and processing conditions. A novel experimental setup consisting of solid-state electrochemical cells that can precisely control and monitor the oxygen partial pressure around specimens was designed and built. Preliminary work validated the performance of the oxygen pump and sensor using a one chamber setup. Subsequent work focused on using the setup to compare oxygen transport through various SiC-based materials at elevated temperatures. |