Crystallization behavior of CaO-Al2O3-SiO2 glass-ceramics prepared from wastes of glass and clay raw materials (Kira)

T. Toya, Yoshikazu Kameshima, A. Yasumori, K. Okada

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Abstract

Very large amounts of wastes (called Kira) are produced by the purification of raw materials for sheet glass and porcelain manufacture in Japan; it is highly desirable to develop effective usage of this waste. To this end, the crystallization behavior of CaO-Al2O3-SiO2 glass prepared from mixtures of Kira and CaCO3 was investigated to obtain fundamental data about these glass-ceramic materials. The glass powders obtained by melting at 1400°C were water-quenched and ground, then re-heated at 900-1250°C for 2-240 min. Wollastonite (Wo), the low temperature phase of CaSiO3, crystallized at ∼900°C. The amount of Wo increased very steeply with higher heating temperature to a maximum content of 55 vol%. Anorthite was formed only as a minor phase under restricted conditions. The Wo transformed into the high temperature phase pseudowollastonite (PW) above 1150°C but the transformation is relatively slow, requiring heating times >60 min. The activation energies for nucleation and nucleation-growth of Wo were 223 and 259 kJ/mol, respectively, significantly smaller than other reported values. The crystallization and phase transformation of Wo showed complicated behavior related to the particle size.

Original languageEnglish
Pages (from-to)1843-1846
Number of pages4
JournalKey Engineering Materials
Volume264-268
Issue numberIII
Publication statusPublished - 2004
Externally publishedYes

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Keywords

  • Crystallization
  • Glass Ceramics
  • Kira
  • Waste

ASJC Scopus subject areas

  • Ceramics and Composites
  • Chemical Engineering (miscellaneous)

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