Chapter 4. Characterization of Porosity in Green-State and Partially Densified Al2O3 by Nuclear Magnetic Resonance Imaging

  1. William Smothers
  1. W. A. Ellingson1,
  2. J. L. Ackerman2,
  3. L. Garrido2,
  4. J. D. Weyand3 and
  5. R. A. Dimilia3

Published Online: 26 MAR 2008

DOI: 10.1002/9780470320402.ch4

11th Annual Conference on Composites and Advanced Ceramic Materials: Ceramic Engineering and Science Proceedings, Volume 8, Issue 7/8

11th Annual Conference on Composites and Advanced Ceramic Materials: Ceramic Engineering and Science Proceedings, Volume 8, Issue 7/8

How to Cite

Ellingson, W. A., Ackerman, J. L., Garrido, L., Weyand, J. D. and Dimilia, R. A. (1987) Characterization of Porosity in Green-State and Partially Densified Al2O3 by Nuclear Magnetic Resonance Imaging, in 11th Annual Conference on Composites and Advanced Ceramic Materials: Ceramic Engineering and Science Proceedings, Volume 8, Issue 7/8 (ed W. Smothers), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470320402.ch4

Author Information

  1. 1

    Materials and Components Div., Argonne National Lab Argonne, IL 60439

  2. 2

    Massachusetts General Hospital Boston, MA 02114

  3. 3

    Alcoa Labs Alcoa Center, PA 15069

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1987

ISBN Information

Print ISBN: 9780470374733

Online ISBN: 9780470320402

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Keywords:

  • partially densified;
  • nuclear magnetic resonance(NMR);
  • hydrogen protons;
  • NMR technique;
  • massachusetts general hospital

Summary

The characterization of advanced ceramics presents a challenge to conventional nondestructive evaluation techniques. Small bulk-density gradients, caused mainly by porosity differences, may lead to failure. Specimens were prepared from Al2O3 powder and processed to different density states. The specimens ranged in density from as-pressed to nominally 90% theoretical density. The relative porosity levels of the specimens were measured by a small-bore nuclear magnetic resonance (NMR) imaging system. The results demonstrate the potential of NMR for characterizing open porosity in ceramic bodies.