Hot-pressing behaviours of the gel and melt-derived sodium-borosilicate glass powders


Gunay V.

CERAMICS INTERNATIONAL, vol.23, no.4, pp.291-296, 1997 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 23 Issue: 4
  • Publication Date: 1997
  • Doi Number: 10.1016/s0272-8842(96)00010-7
  • Title of Journal : CERAMICS INTERNATIONAL
  • Page Numbers: pp.291-296

Abstract

Na-borosilicate glasses are used widely in glass-matrix composites which are produced by slurry or sol-gel infiltration followed by hot-pressing. The hot-pressing behaviours of the glass powders are an important parameter in the preparation of the glass-matrix composites. The densification and crystallization of the gel and melt-derived Na-borosilicate glass powders under hot-pressing were studied. Gel-derived powders crystallized faster than the melt-derived powders. Cristobalite was the crystalline phase in both powders. The crystallization of the gel and melt-derived powders inhibited the viscous sintering during hot-pressing. Viscosities of the powders were calculated at various temperatures under isothermal hot-pressing conditions. Melt-derived powders had lower viscosities then the gel-derived powders. (C) 1997 Elsevier Science Limited and Techna S.r.l.