Sintering aids for silicon carbide and alumina composite ceramics used as ceramic foam filters


Erkalfa H., Ozkan O.

INDUSTRIAL CERAMICS, cilt.20, ss.10-12, 2000 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 20 Konu: 1
  • Basım Tarihi: 2000
  • Dergi Adı: INDUSTRIAL CERAMICS
  • Sayfa Sayıları: ss.10-12

Özet

The effect of sintering aids such as quartzite, silica-sol, diatomite, perlite and bentonite were investigated for the sintering characteristics and strength of a silicon carbide-alumina composite ceramic used as a foam filter. The addition of ground quartzite to the composition did not promote the formation of the mullite phase due ra the poor reactivity of SiO2-Al2O3 phases. Hence these samples showed high apparent porosity and poor strength. The addition of silica-sol also did nor have a significant effect on the strength, except that it improved the binding properties the compositions. However, the addition of alkaline based additives like bentonite, perlite and also a fine-particle source of silica in the form diatomite improved the strength by promoting the formation of a mullite phase in the sintered compositions.