Chapter 11. Characterization of Machining-Induced Sub-Surface Damage of a High Strength Silicon Nitride

  1. J. P. Singh
  1. R. D. Ott1,2,
  2. K. Bredert1,
  3. T. R. Watkins2,
  4. M. K. Ferbert2 and
  5. J. M. Rigsbee1

Published Online: 26 MAR 2008

DOI: 10.1002/9780470294444.ch11

Proceedings of the 21st Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - B: Ceramic Engineering and Science Proceedings, Volume 18, Issue 4

Proceedings of the 21st Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - B: Ceramic Engineering and Science Proceedings, Volume 18, Issue 4

How to Cite

Ott, R. D., Bredert, K., Watkins, T. R., Ferbert, M. K. and Rigsbee, J. M. (1997) Characterization of Machining-Induced Sub-Surface Damage of a High Strength Silicon Nitride, in Proceedings of the 21st Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - B: Ceramic Engineering and Science Proceedings, Volume 18, Issue 4 (ed J. P. Singh), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470294444.ch11

Author Information

  1. 1

    The University of Alabama at Birmingham, Birmingham, AL 35294

  2. 2

    High Temperature Materials Laboratory, Oak Ridge National Laboratory, Oak Ridge, TN 37831

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1997

ISBN Information

Print ISBN: 9780470375532

Online ISBN: 9780470294444

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Keywords:

  • utilized;
  • micro-cracking;
  • formation;
  • longitudinal;
  • anisotropy

Summary

Surface machining was performed on a high strength silicon nitride (Si3N4) using a statistical experimental design in which the down feed, table speed, wheel surface speed and the grit size were systematically varied. The material's resulting strength was related to the machining forces, which in turn were correlated to the various machining parameters. Several different characterization techniques were utilized to evaluate the sub-surface damage induced by grinding of the high strength silicon nitride. The sub-surface damage is comprised of micro-cracking and plastic deformation which leads to residual stresses. The micro-cracking was characterized with optical and scanning electron microscopy, while the depth of the plastic deformation was determined by grazing incidence x-ray analysis and transmission electron microscopy. Results from this study consistently showed that the machining-induced plastic deformation was limited to depths of approximately one grain thickness for this Si3N4, independent of the grinding conditions investigated.