Chapter 1. Hot Pressing Analysis of Ceramic Powders with Green Density Gradients

  1. J. P. Singh
  1. Sandeepan Bhattacharya,
  2. Karl Jakus and
  3. Ian Grosse

Published Online: 26 MAR 2008

DOI: 10.1002/9780470294444.ch1

Proceedings of the 21st Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - B: Ceramic Engineering and Science Proceedings, Volume 18, Issue 4

Proceedings of the 21st Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - B: Ceramic Engineering and Science Proceedings, Volume 18, Issue 4

How to Cite

Bhattacharya, S., Jakus, K. and Grosse, I. (1997) Hot Pressing Analysis of Ceramic Powders with Green Density Gradients, in Proceedings of the 21st Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - B: Ceramic Engineering and Science Proceedings, Volume 18, Issue 4 (ed J. P. Singh), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470294444.ch1

Author Information

  1. Department of Mechanical and Industrial Engineering, University of Massachusetts, Amherst, MA 01003

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1997

ISBN Information

Print ISBN: 9780470375532

Online ISBN: 9780470294444

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Keywords:

  • cylindrical;
  • residual stresses;
  • densification;
  • variation;
  • homogeneous

Summary

An analysis was performed to predict the densification behavior and residual stress development during hot pressing of cylindrical alumina compacts with green density gradients. The objective of the analysis was to assess the possibility of strengthening ceramic parts by beneficial residual stresses produced using judicious processing techniques. For the analysis a generalized densification model was used that accounts for the effects of deviatoric stresses. Results for two cases are presented, namely hot pressing with a constant force and hot pressing with a constant displacement rate. In each case the green density was varied linearly from the center line to the cylindrical surface of the compact. It was predicted that hot pressing with a constant force is not likely to lead to significant residual stresses. However, controlled axial displacement rate can result in substantial residual compressive stress at the surface. These residual stresses are balanced by interior tensile stresses. The remaining spatial variation in density is relatively small.