Paper Title:
Crystallization of Gahnite in CMAS Glass Forming System - Mechanism and Process Kinetics
  Abstract

The crystallisation mechanism of glass-ceramic materials from a CMAS group Al0.37B0.34Fe0.01Mg0.02Zn0.29Ca0.05Si0.78O3 was tested under non-isothermal conditions by the DTA method. Glass-ceramic material of two-phase composition with precipitation of crystallites from islet silicates Zn2SiO4 and a crystalline phase from a spinel group, gahnite ZnAl2O4 was obtained in the system under investigation. Activation energy of a crystallization process Ea was determined and a crystal growth morphology parameter n was computed. It was revealed that in the test material from a CMAS group one could obtain the crystalline phase in the form of ghanite as a result of a controlled process of crystallization. The occurrence of a spinel phase caused the obtained glass-ceramic material had higher fracture toughness (KIC) than material from a CMAS group, containing pyroxene crystalline phases typical for this system.

  Info
Periodical
Edited by
Pietro VINCENZINI and Michele DONDI
Pages
59-64
DOI
10.4028/www.scientific.net/AST.68.59
Citation
D. Herman, T. Okupski, W. Walkowiak, "Crystallization of Gahnite in CMAS Glass Forming System - Mechanism and Process Kinetics", Advances in Science and Technology, Vol. 68, pp. 59-64, 2010
Online since
October 2010
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