Chapter 20. Ion Implantation of Silicon Nitride for Rolling Element Bearing Applications

  1. John B. Wachtman Jr
  1. J. A. Morrison1,
  2. A. B. Thakker1 and
  3. A. J. Armini2

Published Online: 26 MAR 2008

DOI: 10.1002/9780470310502.ch20

12th Annual Conference on Composites and Advanced Ceramic Materials, Part 2 of 2: Ceramic Engineering and Science Proceedings, Volume 9, Issue 9/10

12th Annual Conference on Composites and Advanced Ceramic Materials, Part 2 of 2: Ceramic Engineering and Science Proceedings, Volume 9, Issue 9/10

How to Cite

Morrison, J. A., Thakker, A. B. and Armini, A. J. (1988) Ion Implantation of Silicon Nitride for Rolling Element Bearing Applications, in 12th Annual Conference on Composites and Advanced Ceramic Materials, Part 2 of 2: Ceramic Engineering and Science Proceedings, Volume 9, Issue 9/10 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470310502.ch20

Author Information

  1. 1

    Rolls-Royce Inc. Atlanta, GA 30349

  2. 2

    Implant Services Corp. Danvers, MA 01923

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1988

ISBN Information

Print ISBN: 9780470374818

Online ISBN: 9780470310502

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Keywords:

  • gas turbines;
  • tolerance;
  • silicon nitride;
  • titanium ion;
  • potential

Summary

Ceramic rolling element bearings offer significant advantages over typical steel bearings in numerous applications, including gas turbines. However, to realize these benefits, silicon nitride bearings still require improved damage tolerance, reliability, and reduced contact stresses. Surface modification via ion implantation is therefore being investigated to improve the surface properties of silicon nitride. Ion implantation was performed using nitrogen, silicon, and titanium ion beams over a range of doses and energies. Post implantation tests included microhardness, flexure strength, and fracture toughness measurements. Results show a dramatic increase (100%) in near-surface hardness which corresponds in depth to the ion penetration depth profile. The flexure strength, particularly the strength distribution, shows marked improvement and potential for even further improvement.

A finite element stress analysis was also performed which shows the residual stress state induced by the implantation process. The effect this has on the surface mechanical properties and potential bearing performance is discussed.