About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
Advances in Materials and Systems for a Hydrogen Economy
|
| Presentation Title |
Degradation of stoichiometric and non-stoichiometric mullites in dry (Ar - 10% H2) and humid hydrogen (Ar - 10% H2-3% H2O) environment |
| Author(s) |
Manoj K. Mahapatra, Rajat Durgesh Ramteke, James G Hemrick |
| On-Site Speaker (Planned) |
Manoj K. Mahapatra |
| Abstract Scope |
Three mullite refractories, a stoichiometric and non-stoichiometric form, and a laboratory stoichiometric version (control material) were exposed to hydrogen-containing atmospheres. The stability of the mullites was investigated in humid (~3% H2O) and dry hydrogen (Ar-10% H2) atmosphere at 1100°C with dwell times of 20 hours or more in terms of evaporation, and structural and microstructural changes. Significant evaporation was observed for the two industrial grades but not recognized for the laboratory-grade control sample. The difference in the degradation of industrial-grade and laboratory-grade stoichiometric mullite is noticeable possibly due to the compositional heterogeneity in the industrial grade sample. The plausible degradation mechanisms are discussed. |