Chapter 41. Effects of Oil Degradation on the Friction and Wear Properties of Silicon Nitride/M-50 Steel Sliding Couples

  1. J. P. Singh
  1. Robert Sabia,
  2. David Mitchell and
  3. James H. Adair

Published Online: 26 MAR 2008

DOI: 10.1002/9780470294437.ch41

Proceedings of the 21st Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 18, Issue 3

Proceedings of the 21st Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 18, Issue 3

How to Cite

Sabia, R., Mitchell, D. and Adair, J. H. (1997) Effects of Oil Degradation on the Friction and Wear Properties of Silicon Nitride/M-50 Steel Sliding Couples, in Proceedings of the 21st Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 18, Issue 3 (ed J. P. Singh), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470294437.ch41

Author Information

  1. University of Florida Materials Science and Engineering Gainesville, FL 32611

Publication History

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

ISBN Information

Print ISBN: 9780470375495

Online ISBN: 9780470294437

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Keywords:

  • silicon nitride;
  • degradation;
  • chromatography;
  • wear measurements;
  • surface tension

Summary

The effect of oil degradation on the wear behavior of the silicon nitride/MSO steel system has been studied in order to understand the influences of oil degradation on bearing performance. Degraded oil samples were generated by heating a conventional gas turbine lubricant (MIL-L-23699) to temperatures between 200–300°C for various times. Sample characterization was performed using total acid number, antioxidant concentration, rheometry, surface tension, spectroscopy, and gel permeation chromatography. Coefficient of friction and rate of wear were measured on the oil samples using a pin-on-disk test apparatus under a Hertzian contact stress of 1.6 GPa at 25°1°C. Results show significant physical and chemical changes which could not be attributed to any specific degradation product. Degradation is shown to increase the coefficient of friction, with no correlations to wear measurements.