Thermal analysis of phase transformation kinetics in α-Al2O3 seeded boehmite and γ-Al2O3

C. Scott Nordahl; Gary L. Messing

doi:10.1016/s0040-6031(98)00343-8

Thermal analysis of phase transformation kinetics in α-Al₂O₃ seeded boehmite and γ-Al₂O₃

C. Scott Nordahl, Gary L. Messing

Research output: Contribution to journal › Article › peer-review

71 Scopus citations

Abstract

The effect of α-Al₂O₃ seeding on the transformation kinetics of high purity commercial boehmite and γ-Al₂O₃ 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-Al₂O₃ phase transformation decreases for boehmite and γ-Al₂O₃ powders with an appropriate addition of α-Al₂O₃ seed particles. For 5 wt.% seeded (2×10¹⁵ seeds/cm³ γ-Al₂O₃) 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-Al₂O₃ samples, the transformation temperature and activation energy were decreased by 75°C and 170 kJ/mol, respectively, compared to unseeded γ-Al₂O₃.

Original language	English (US)
Pages (from-to)	187-199
Number of pages	13
Journal	Thermochimica Acta
Volume	318
Issue number	1-2
DOIs	https://doi.org/10.1016/s0040-6031(98)00343-8
State	Published - Sep 7 1998

All Science Journal Classification (ASJC) codes

Instrumentation
Condensed Matter Physics
Physical and Theoretical Chemistry

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title = "Thermal analysis of phase transformation kinetics in α-Al2O3 seeded boehmite and γ-Al2O3",

abstract = "The effect of α-Al2O3 seeding on the transformation kinetics of high purity commercial boehmite and γ-Al2O3 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-Al2O3 phase transformation decreases for boehmite and γ-Al2O3 powders with an appropriate addition of α-Al2O3 seed particles. For 5 wt.% seeded (2×1015 seeds/cm3 γ-Al2O3) 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-Al2O3 samples, the transformation temperature and activation energy were decreased by 75°C and 170 kJ/mol, respectively, compared to unseeded γ-Al2O3.",

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AU - Messing, Gary L.

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N2 - The effect of α-Al2O3 seeding on the transformation kinetics of high purity commercial boehmite and γ-Al2O3 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-Al2O3 phase transformation decreases for boehmite and γ-Al2O3 powders with an appropriate addition of α-Al2O3 seed particles. For 5 wt.% seeded (2×1015 seeds/cm3 γ-Al2O3) 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-Al2O3 samples, the transformation temperature and activation energy were decreased by 75°C and 170 kJ/mol, respectively, compared to unseeded γ-Al2O3.

AB - The effect of α-Al2O3 seeding on the transformation kinetics of high purity commercial boehmite and γ-Al2O3 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-Al2O3 phase transformation decreases for boehmite and γ-Al2O3 powders with an appropriate addition of α-Al2O3 seed particles. For 5 wt.% seeded (2×1015 seeds/cm3 γ-Al2O3) 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-Al2O3 samples, the transformation temperature and activation energy were decreased by 75°C and 170 kJ/mol, respectively, compared to unseeded γ-Al2O3.

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Thermal analysis of phase transformation kinetics in α-Al₂O₃ seeded boehmite and γ-Al₂O₃

Abstract

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