Utilization of a phosphate ester as a dispersant for SiAlON based ceramics

Ceylan A., Suvaci E., Mandal H.

5th International Symposium on Nitrides, Eskişehir, Turkey, 3 - 05 April 2006, vol.554, pp.71-73 identifier

  • Publication Type: Conference Paper / Full Text
  • Volume: 554
  • Doi Number: 10.4028/www.scientific.net/msf.554.71
  • City: Eskişehir
  • Country: Turkey
  • Page Numbers: pp.71-73
  • Keywords: SiAlON, sodium tripolyphosphate, zeta potential, sedimentation, suspension, SILICON-NITRIDE, BETA-SIALON, SUSPENSIONS, POWDER, MEDIA
  • Anadolu University Affiliated: Yes

Abstract

Aqueous dispersions of SiAION forming powders (Si3N4, AIN and Y2O3) were obtained. Dispersibility of powders was found to be improved by addition of sodium tripolyphosphate. Stable aqueous suspensions of SiAION forming powders were prepared by using a phosphate ester, sodium tripolyphosphate (STPP, Na5P3O10). Effect of the STPP on rheological properties of the powder mixture was investigated by zeta potential measurements, sedimentation and milling studies. It has been shown that addition of the STPP to the aqueous SiAION forming powder mixture improves the dispersion behavior significantly. These results suggest that STPP can be utilized as a dispersant in such ceramic systems.