Chapter 27. New Hardness Standard Reference Materials (SRM's) for Advanced Ceramics

  1. John B. Wachtman Jr.
  1. R. J. Gettings,
  2. G. D. Quinn,
  3. A. W. Ruff and
  4. L. K. Ives

Published Online: 28 MAR 2008

DOI: 10.1002/9780470314555.ch27

Proceedings of the 18th Annual Conference on Composites and Advanced Ceramic Materials - B: Ceramic Engineering and Science Proceedings, Volume 15, Issue 5

Proceedings of the 18th Annual Conference on Composites and Advanced Ceramic Materials - B: Ceramic Engineering and Science Proceedings, Volume 15, Issue 5

How to Cite

Gettings, R. J., Quinn, G. D., Ruff, A. W. and Ives, L. K. (2008) New Hardness Standard Reference Materials (SRM's) for Advanced Ceramics, in Proceedings of the 18th Annual Conference on Composites and Advanced Ceramic Materials - B: Ceramic Engineering and Science Proceedings, Volume 15, Issue 5 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470314555.ch27

Author Information

  1. Ceramics Division, NIST, Gaithersburg, MD 20899

Publication History

  1. Published Online: 28 MAR 2008
  2. Published Print: 1 JAN 1994

ISBN Information

Print ISBN: 9780470375334

Online ISBN: 9780470314555

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Keywords:

  • hardness is a material characteristic;
  • aid materials engineering and characterization;
  • hardness values;
  • ballistic armor;
  • hardness measurement

Summary

Hardness is a frequently measured characteristic of advanced ceramics. Measurement accuracy is often unknown, and uncertainties of 20% are not unusual. To remedy this, two standard reference materials (SRM's) with certified hardness values of nominally 15 GPa are under development at NIST. A hot isostatically-pressed silicon nitride will be used for the Knoop hardness standard, and a cobalt-bonded tungsten carbide was selected for the Vickers standard. Prototype SRM's were developed, measured, and tested for repeatability and reproducibility of their hardness numbers, and for adherence to ASTM standards. These SRM's will facilitate testing procedures leading to higher accuracy and precision.