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

Gunay V.

CERAMICS INTERNATIONAL, cilt.23, ss.291-296, 1997 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 23 Konu: 4
  • Basım Tarihi: 1997
  • Doi Numarası: 10.1016/s0272-8842(96)00010-7
  • Sayfa Sayıları: ss.291-296


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.