Chapter 12. Use of Polyphosphates as Deflocculants of Alumina

  1. John B. Wachtman Jr.
  1. J. Faison and
  2. R. A. Haber

Published Online: 26 MAR 2008

DOI: 10.1002/9780470313183.ch12

Materials & Equipment/Whitewares: Ceramic Engineering and Science Proceedings, Volume 12, Issue 1/2

Materials & Equipment/Whitewares: Ceramic Engineering and Science Proceedings, Volume 12, Issue 1/2

How to Cite

Faison, J. and Haber, R. A. (2008) Use of Polyphosphates as Deflocculants of Alumina, in Materials & Equipment/Whitewares: Ceramic Engineering and Science Proceedings, Volume 12, Issue 1/2 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470313183.ch12

Author Information

  1. Rutgers University Piscataway, NY 08855

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1991

ISBN Information

Print ISBN: 9780470374979

Online ISBN: 9780470313183

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Keywords:

  • alumina;
  • ceramic oxide suspensions;
  • phosphate defIocculants;
  • polyphosphates;
  • hydrolyze

Summary

Studies on the use of phosphate deflocculants in aqueous alumina slip-casting suspensions were performed to define the effects of chain length and concentration on suspension viscosity. On a weight basis, longer chain phosphates such as sodium hexametaphosphate (n=13) and glassy phosphates (n=6, 21) provided a more effective viscosity reduction as compared to shorter chain phosphates such as tetrasodium pyrophosphate (n=2) and sodium tripolyphosphate (n=13). However, longer chain phosphates were found to be subject to age degradation, whereas short chains phosphates were not.