Chapter 37. Critical Flaws in Sintered Compacts of Alumina Granules

  1. John B. Wachtman Jr.
  1. D. Doshi and
  2. J. S. Reed

Published Online: 26 MAR 2008

DOI: 10.1002/9780470314784.ch37

Proceedings of the 19th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - B: Ceramic Engineering and Science Proceedings, Volume 16, Issue 5

Proceedings of the 19th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - B: Ceramic Engineering and Science Proceedings, Volume 16, Issue 5

How to Cite

Doshi, D. and Reed, J. S. (1995) Critical Flaws in Sintered Compacts of Alumina Granules, in Proceedings of the 19th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - B: Ceramic Engineering and Science Proceedings, Volume 16, Issue 5 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470314784.ch37

Author Information

  1. NYS College of Ceramics, Alfred University, Alfred, NY 14802

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1995

ISBN Information

Print ISBN: 9780470375389

Online ISBN: 9780470314784

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Keywords:

  • combustion;
  • atomized;
  • eliminates;
  • inspiration;
  • retention

Summary

Critical flaws in sintered alumina prepared by dry pressing spray dried granules were examined. Specimens were sintered to different densities ranging from 67% to 97% theoretical density. Bars machined out of these specimens were tested for flexural strength using 4-pt bending. Fractography on these specimens was performed using optical and scanning electron microscopy.

Fractography revealed that machining damage was the dominant flaw at 67% density, whereas, pores and microlaminations were dominant at 77% and 88% densities. Differential sintering caused by the presence of microlaminations appeared to have led to the formation of regions of micropores in material of 97% density. A correlation between the dominant flaws and Weibull moduli is also made.