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

Research output: Contribution to journalArticle

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

Fingerprint

Glass ceramics
Crystallization
Raw materials
Clay
Glass
Nucleation
Heating
Porcelain
Ceramic materials
Temperature
Purification
Melting
Activation energy
Phase transitions
Particle size
Powders
Dental Porcelain
calcium silicate
clay
Water

Keywords

  • Crystallization
  • Glass Ceramics
  • Kira
  • Waste

ASJC Scopus subject areas

  • Ceramics and Composites
  • Chemical Engineering (miscellaneous)

Cite this

Crystallization behavior of CaO-Al2O3-SiO2 glass-ceramics prepared from wastes of glass and clay raw materials (Kira). / Toya, T.; Kameshima, Yoshikazu; Yasumori, A.; Okada, K.

In: Key Engineering Materials, Vol. 264-268, No. III, 2004, p. 1843-1846.

Research output: Contribution to journalArticle

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AU - Okada, K.

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