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Journal of Materials Science

, Volume 32, Issue 6, pp 1649–1655 | Cite as

Sintering and crystallization of volume- and surface-modified cordierite glass powders

  • W WINTER
Article

Abstract

The sintering and crystallization behaviour of a series of cordierite-type glass powders with varying substitution of Na2O for MgO was compared with that of glass powders subjected to an Mg2+2Na+ ion-exchange treatment. The ion-exchange modifies only the properties of a 3–4 μm thick surface layer on the glass grains. Whereas the bulk substitution results in a decrease in the glass transition temperature, Tg, the surface modification shows only a small influence on the overall Tg of the ion-exchanged glass. Both glass powder series show, however, a temperature decrease of the start of sintering with increasing Na2O content which demonstrates that only the viscosity of a surface layer is decisive for the start of sintering. The sintering range is enlarged to higher temperatures through the suppression of the crystallization of β-quartz solid solution. The surface-modified glass powders show strong cordierite crystallization at constant temperatures around 1000 °C, whereas in the bulk-modified glass powders, the temperature of cordierite crystallization increases and the total amount of cordierite decreases with increasing Na2O content.

Keywords

Cordierite Crystallization Behaviour Nepheline Glass Powder Thick Surface Layer 

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Copyright information

© Chapman and Hall 1997

Authors and Affiliations

  • W WINTER
    • 1
  1. 1.Laboratoire de Science des Materiaux VitreuxUniversite Montpellier IIMontpellier cedex 5France

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