Crystallization kinetics of mullite from Al2O3-SiO2 glasses under non-isothermal conditions

Takahiro Takei, Yoshikazu Kameshima, Atsuo Yasumori, Kiyoshi Okada

Research output: Contribution to journalArticle

59 Citations (Scopus)

Abstract

The kinetics of mullite crystallization from Al2O3-SiO2 glasses with chemical compositions ranging from 15 to 50 mol% Al2O3 were investigated under non-isothermal conditions using DTA. The glasses were prepared by ultra-quenching of molten droplets formed at the tip of a sintered aluminosilicate rod by an infra-red imaging furnace quenched by a twin-roller system. All the samples showed an exothermic peak at about 1000°C associated with mullitization. This crystallization temperature increased slightly with decreasing Al2O3 content. The exothermic peak split into two peaks at a glass composition of about 25 mol% Al2O3. This splitting is thought to be related to phase separation of the glass preceding mullitization. The activation energies for the nucleation-growth mechanism of mullitization, calculated by the Kissinger method, were 900-1300 kJ/mol, in good agreement with those for glass fibers obtained under isothermal conditions (Takei, T., Kameshima, Y., Yasumori, A. and Okada, K., Crystallization kinetics of mullite in alumina-silica glass fibers. J. Am. Ceram. Soc., 1999, 82, 2876-2880).

Original languageEnglish
Pages (from-to)2487-2493
Number of pages7
JournalJournal of the European Ceramic Society
Volume21
Issue number14
DOIs
Publication statusPublished - Sep 29 2001
Externally publishedYes

Keywords

  • Activation energy
  • Crystallizatioin
  • DTA
  • Glass
  • Mullite

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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