Abstract
The effect of α-Al 2O 3 seeding on the transformation kinetics of high purity commercial boehmite and γ-Al 2O 3 was investigated. The effect of seed size, powder purity, sample homogeneity, and sample density on the transformation kinetics are discussed. The temperature and activation energy of the θ to α-Al 2O 3 phase transformation decreases for boehmite and γ-Al 2O 3 powders with an appropriate addition of α-Al 2O 3 seed particles. For 5 wt.% seeded (2×10 15 seeds/cm 3 γ-Al 2O 3) boehmite samples, the transformation temperature and activation energy were decreased by 85°C and 115 kJ/mol, respectively, compared to unseeded boehmite. For 5 wt.% seeded γ-Al 2O 3 samples, the transformation temperature and activation energy were decreased by 75°C and 170 kJ/mol, respectively, compared to unseeded γ-Al 2O 3.
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