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

C. Scott Nordahl, Gary Lynn Messing

Research output: Contribution to journalArticle

53 Citations (Scopus)

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 languageEnglish (US)
Pages (from-to)187-199
Number of pages13
JournalThermochimica Acta
Volume318
Issue number1-2
StatePublished - Sep 7 1998

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Thermoanalysis
phase transformations
Seed
thermal analysis
Activation energy
Phase transitions
seeds
Kinetics
kinetics
activation energy
Powders
purity
Temperature
inoculation
homogeneity
temperature
energy
aluminum oxide hydroxide

All Science Journal Classification (ASJC) codes

  • Instrumentation
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

Cite this

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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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Thermal analysis of phase transformation kinetics in α-Al2O3 seeded boehmite and γ-Al2O3. / Nordahl, C. Scott; Messing, Gary Lynn.

In: Thermochimica Acta, Vol. 318, No. 1-2, 07.09.1998, p. 187-199.

Research output: Contribution to journalArticle

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