Abstract
The oxidation behavior of NBD 200 Si3N4 containing 1 wt% MgO sintering aid was investigated in oxygen at 900°-1300°C. The oxide growth followed a parabolic rate law with an apparent activation energy of 260 kJ/mol. The oxide layers were enriched with sodium and magnesium because of outward diffusion of intergranular Na+ and Mg2+ cations in the ceramics. The 2-4 orders of magnitude higher oxidation rate for NBD 200 Si3N4 than for other Si3N4 ceramics with a similar amount of MgO could be attributed to the presence of sodium. The oxidation process was most likely rate limited by grain-boundary diffusion of Mg2+.
Original language | English |
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Pages (from-to) | 2260-2262 |
Number of pages | 3 |
Journal | Journal of the American Ceramic Society |
Volume | 82 |
Issue number | 8 |
DOIs | |
State | Published - 1999 |