42. Shaping of Bulk Glasses and Ceramics with Nanosized Particles

  1. Manuel E. Brito,
  2. Peter Filip,
  3. Charles Lewinsohn,
  4. Ali Sayir,
  5. Mark Opeka and
  6. William M. Mullins
  1. Jan Tabellion1 and
  2. Rolf Clasen2

Published Online: 26 MAR 2008

DOI: 10.1002/9780470291283.ch42

Developments in Advanced Ceramics and Composites: Ceramic Engineering and Science Proceedings, Volume 26, Number 8

Developments in Advanced Ceramics and Composites: Ceramic Engineering and Science Proceedings, Volume 26, Number 8

How to Cite

Tabellion, J. and Clasen, R. (2005) Shaping of Bulk Glasses and Ceramics with Nanosized Particles, in Developments in Advanced Ceramics and Composites: Ceramic Engineering and Science Proceedings, Volume 26, Number 8 (eds M. E. Brito, P. Filip, C. Lewinsohn, A. Sayir, M. Opeka and W. M. Mullins), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470291283.ch42

Author Information

  1. 1

    Institute of Microsystem Technology Laboratory for Materials Process Technology University of Freiburg Georges-Köhler-AUee 102 D 79110 Freiburg, Germany

  2. 2

    Department of Powder Technology Saarland University, Geb. 43 D 66123 Saarbrücken, Germany

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 2005

ISBN Information

Print ISBN: 9781574982619

Online ISBN: 9780470291283

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Keywords:

  • electrophoretic;
  • parameters;
  • transformations;
  • perpendicular;
  • homogeneity

Summary

Manufacturing of functional ceramics and high-performance glasses by shaping of nanoparticles and subsequent sintering combines significant advantages. Due to the high specific surface area of nanoparticles significantly increased sintering activity is achieved, which results in much lower sintering temperature. However, most of the common shaping techniques are not adapted to the intrinsic properties of nano particles. Due to their high specific surface area and low bulk density dry pressing can not provide an economic alternative. Suspension-based techniques seem to be much more promising to achieve green bodies with high density and good homogeneity. Nevertheless, with slip or pressure casting only comparably low compaction rates can be achieved, decreasing with particle size. In contrast, deposition rate is independent of particle size in case of electrophoreric deposition (EPD). Thus, EPD from aqueous suspensions is a fast and economic shaping technique for nanosized particles. A deposition rate of up to 3.5 mm/min was achieved, controlled mainly by the applied electric field strength (typically 1 to 10 V/cm). However, due to the high specific surface area of nano-particles, the density of the electrophoretically deposited green bodies was limited to about 50%TD. By combining nanosized with larger particles, significantly higher green densities could be reached. From a suspension with optimized properties and adjusted parameters during EPD a green density of up to 81 %TD could be reached, resulting in a strong decrease in sintering shrinkage down to app. 6 %. Samples are shown for silica glasses and zirconia.