Effect of FeO concentration on the crystallization of high-temperature CaO - Al2 O3- MgO - FeO melts

Sung Suk Jung, Il Sohn

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

Continuous cooling transformation (CCT) and time-temperature transformation (TTT) diagrams were plotted for CaO-Al2O3-MgO-FeO melts, and the morphology of the primary crystals formed was determined with a confocal laser scanning microscope (CLSM). When the CaO/Al2O3 ratio is 1.0, the crystallization temperature and incubation time increase with increasing MgO content. The TTT curve at 7.5 mass% MgO has a "C" shape, which facilitates the formation of amorphous phases. However, increasing the FeO content accelerated the crystallization time and lowered the crystallization temperature. The solidified melt with an FeO content of less than 10 mass% was a combination of the C3MA2 and C 5A3 phases; higher FeO content led to the formation of a secondary phase of Ca2FeAlO5 and CA following the precipitation of the C3MA2 primary phase. In addition, kinetic evaluation of the crystal growth with confocal micrographs indicated that the calculated crystal volume agreed well with the Johnson-Mehl-Avrami sigmoidal curve fit.

Original languageEnglish
Pages (from-to)1309-1316
Number of pages8
JournalJournal of the American Ceramic Society
Volume96
Issue number4
DOIs
Publication statusPublished - 2013 Apr 1

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Crystallization
Temperature
Crystals
Crystal growth
Microscopes
Cooling
Scanning
Kinetics
Lasers

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

Cite this

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abstract = "Continuous cooling transformation (CCT) and time-temperature transformation (TTT) diagrams were plotted for CaO-Al2O3-MgO-FeO melts, and the morphology of the primary crystals formed was determined with a confocal laser scanning microscope (CLSM). When the CaO/Al2O3 ratio is 1.0, the crystallization temperature and incubation time increase with increasing MgO content. The TTT curve at 7.5 mass{\%} MgO has a {"}C{"} shape, which facilitates the formation of amorphous phases. However, increasing the FeO content accelerated the crystallization time and lowered the crystallization temperature. The solidified melt with an FeO content of less than 10 mass{\%} was a combination of the C3MA2 and C 5A3 phases; higher FeO content led to the formation of a secondary phase of Ca2FeAlO5 and CA following the precipitation of the C3MA2 primary phase. In addition, kinetic evaluation of the crystal growth with confocal micrographs indicated that the calculated crystal volume agreed well with the Johnson-Mehl-Avrami sigmoidal curve fit.",
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Effect of FeO concentration on the crystallization of high-temperature CaO - Al2 O3- MgO - FeO melts. / Jung, Sung Suk; Sohn, Il.

In: Journal of the American Ceramic Society, Vol. 96, No. 4, 01.04.2013, p. 1309-1316.

Research output: Contribution to journalArticle

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AU - Jung, Sung Suk

AU - Sohn, Il

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N2 - Continuous cooling transformation (CCT) and time-temperature transformation (TTT) diagrams were plotted for CaO-Al2O3-MgO-FeO melts, and the morphology of the primary crystals formed was determined with a confocal laser scanning microscope (CLSM). When the CaO/Al2O3 ratio is 1.0, the crystallization temperature and incubation time increase with increasing MgO content. The TTT curve at 7.5 mass% MgO has a "C" shape, which facilitates the formation of amorphous phases. However, increasing the FeO content accelerated the crystallization time and lowered the crystallization temperature. The solidified melt with an FeO content of less than 10 mass% was a combination of the C3MA2 and C 5A3 phases; higher FeO content led to the formation of a secondary phase of Ca2FeAlO5 and CA following the precipitation of the C3MA2 primary phase. In addition, kinetic evaluation of the crystal growth with confocal micrographs indicated that the calculated crystal volume agreed well with the Johnson-Mehl-Avrami sigmoidal curve fit.

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