Chapter 21. Grain Boundary Strengthening of Porous Alumina Ceramics: Effect of Secondary Inclusions and Dopants

  1. Hau-Tay Lin and
  2. Mrityunjay Singh
  1. D. Doni Jayaseelan,
  2. N. Kondo,
  3. M. E. Brito and
  4. T. Ohji

Published Online: 26 MAR 2008

DOI: 10.1002/9780470294758.ch21

26th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: B: Ceramic Engineering and Science Proceedings, Volume 23, Issue 4

26th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: B: Ceramic Engineering and Science Proceedings, Volume 23, Issue 4

How to Cite

Jayaseelan, D. D., Kondo, N., Brito, M. E. and Ohji, T. (2002) Grain Boundary Strengthening of Porous Alumina Ceramics: Effect of Secondary Inclusions and Dopants, in 26th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: B: Ceramic Engineering and Science Proceedings, Volume 23, Issue 4 (eds H.-T. Lin and M. Singh), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470294758.ch21

Author Information

  1. Synergy Materials Research Center National Institute of Advanced Industrial Science and Technology Moriyama-ku Nagoya – 463 8687, Japan

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 2002

ISBN Information

Print ISBN: 9780470375792

Online ISBN: 9780470294758

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Keywords:

  • porous alumina;
  • microstructure;
  • pulse electric;
  • porosity;
  • polyethylene

Summary

A novel method of combined process has been employed to obtain porous ceramics (alumina based composites) of high strength with a narrow pore size distribution via neck growth by Pulse Electric Current Sintering (PECS). The porosity is controllable between 30 ∼ 70 % depending on the sintering temperature and the porous alumina exhibits a narrow pore size distribution, which is a prerequisite of filter applications. Addition of secondary inclusions and dopants significantly increases the interface bond strength via strong necking. It has been realized that in the absence of reinforcing mechanisms, the bonding interface is the area of maximum stress concentration and thus the strength of porous ceramics has been related to the minimum solid contact area.