Defect Analysis in Ceramics by Microwaves

  1. Prof. Dr. G. Müller
  1. H. Dannheim and
  2. H. Hädrich

Published Online: 27 APR 2006

DOI: 10.1002/3527607293.ch64

Ceramics - Processing, Reliability, Tribology and Wear, Volume 12

Ceramics - Processing, Reliability, Tribology and Wear, Volume 12

How to Cite

Dannheim, H. and Hädrich, H. (2006) Defect Analysis in Ceramics by Microwaves, in Ceramics - Processing, Reliability, Tribology and Wear, Volume 12 (ed G. Müller), Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim, FRG. doi: 10.1002/3527607293.ch64

Editor Information

  1. Fraunhofer-Institut für Silicatforschung, Neunerplatz 2, 97082 Würzburg, Germany

Author Information

  1. Institute of Material Science, Departement Ceramics, University of Erlangen-Nürnberg, Germany

Publication History

  1. Published Online: 27 APR 2006
  2. Published Print: 27 JUN 2000

Book Series:

  1. EUROMAT 99

ISBN Information

Print ISBN: 9783527301942

Online ISBN: 9783527607297

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Keywords:

  • defect analysis in ceramics by microwaves

Summary

A microwave setup with variable frequency of 20–40 GHz was built up and the microwave absorption dependent on the local position was measured. A broad variety of ceramics was examined.

To knew the propagation of the waves inside the materials it is necessary to measure the dielectric constants of the materials. They were determined with an angle method.

With lenses it is possible to improve the recognisation of faults and cracks. We examined different systems of lenses.

It is important to do the quality control as early as possible. So the unfired bodies should be examined with microwaves. If the water content of unfired ceramics is too high, there are difficulties with microwaves because of absorption. We measured the dependence of the absortion on frequency to find the less absorption, this depends on the sintered material.