| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Advances in Materials and Systems for a Hydrogen Economy
|
| Presentation Title |
Degradation of Spinel Refractories in Dry (Ar - 10% H2) and Humid Hydrogen (Ar - 10% H2-3% H2O) Environment |
| Author(s) |
Manoj K. Mahapatra, Jakia Sharmin Mim, Rajat Durgesh Ramteke, James Hemrick |
| On-Site Speaker (Planned) |
Manoj K. Mahapatra |
| Abstract Scope |
Refractory ceramics are exposed to hydrogen containing atmospheres for various sectors, ranging from DRI-technique for iron making, steel and cement clicker production to burners, seeking to significantly reduce greenhouse gas emission by using hydrogen containing fuels. The degradation of magnesium aluminate (MgAl2O4) and its potential alternative gahnite (ZnAl2O4) as chrome-free spinel refractory ceramics in humid (~3% H2O) and dry hydrogen (Ar-10% H2) has been studied in 1100°C - 1400°C temperature range. The stability of these materials has been investigated in terms of evaporation rate, changes in lattice parameters and microstructure, and structural integrity. Overall, MgAl2O4 exhibits better stability, in comparison with ZnAl2O4 in the studied conditions. Both the spinel refractories are more stable in humid hydrogen than in dry hydrogen atmosphere. Similar study has also been conducted for common refractory ceramics such as alumina and mullite. The plausible degradation mechanisms are discussed. |