Chapter 50. Evolution of Defects in Pressed and Sintered Electroceramic Components

  1. Waltraud M. Kriven and
  2. Hua-Tay Lin
  1. Robert Danzer1,2,
  2. Andreas Börger1 and
  3. Monika Fellner2

Published Online: 26 MAR 2008

DOI: 10.1002/9780470294826.ch50

27th Annual Cocoa Beach Conference on Advanced Ceramics and Composites: B: Ceramic Engineering and Science Proceedings, Volume 24, Issue 4

27th Annual Cocoa Beach Conference on Advanced Ceramics and Composites: B: Ceramic Engineering and Science Proceedings, Volume 24, Issue 4

How to Cite

Danzer, R., Börger, A. and Fellner, M. (2003) Evolution of Defects in Pressed and Sintered Electroceramic Components, in 27th Annual Cocoa Beach Conference on Advanced Ceramics and Composites: B: Ceramic Engineering and Science Proceedings, Volume 24, Issue 4 (eds W. M. Kriven and H.-T. Lin), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470294826.ch50

Author Information

  1. 1

    Institut für Struktur- und Funktionskeramik, Montanuniversität Leoben, A-8700 Leoben, Austria

  2. 2

    Materials Center, Leoben, A-8700 Leoben, Austria

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 2003

ISBN Information

Print ISBN: 9780470375846

Online ISBN: 9780470294826

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Keywords:

  • electro ceramic components;
  • thermo elastic stresses;
  • microscopy;
  • fractography;
  • granulates

Summary

Electro ceramic components often mechanically fail due to Joule self heating and thermo elastic stresses. In general the brittle failure starts from defects which are distributed within the material and which are generated during the processing of the components. Mechanical strength as well as life-time of the components can largely be improved, if these defects are eliminated or if their size an frequency is reduced.

This work is focused on the description of methods to investigate how dangerous defects come into existence. Microscopy and fractography of granulates, green and sintered bodies are used to trace back the evolution of fracture causing defects. Examples of the genesis of defects from flaws in agglomerates and green bodies to defects in ceramics are given.

In the industrial practice this knowledge can be used to improve the mechanical strength and the reliability of the components.