Kinetics of the alpha-beta Phase Transformation in Seeded Si3N4 Ceramics
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The alpha-beta phase transformation in Si3N4 was studied for seeded samples using all Y2O3-Al2O3 mixture as a sintering aid. The concentration of beta-seeds varied from 0 to 5 wt.%. The results showed that alpha-beta phase transformation followed the first-order reaction. The calculated activation energy for seeded samples was in the range from 348 to 3 78 KJ/mol, indicating boundary reaction as the rate limiting step.
Keywords:Seeded Si3N4 / Phase Transition / Hot-Pressing
Source:Science of Sintering, 2008, 40, 3, 263-270
- Ministry of Science of the Republic of Serbia