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Improvement of Contact Strength of Si3N4/SiC by Combination of Shot Peening and Self-Crack Healing

[+] Author Affiliations
Koji Takahashi

Yokohama National University, Yokohama, Kanagawa, Japan

Paper No. PVP2011-57323, pp. 7-11; 5 pages
doi:10.1115/PVP2011-57323
From:
  • ASME 2011 Pressure Vessels and Piping Conference
  • Volume 6: Materials and Fabrication, Parts A and B
  • Baltimore, Maryland, USA, July 17–21, 2011
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 978-0-7918-4456-4
  • Copyright © 2011 by ASME

abstract

In this study the combination effects of shot peening (SP) and crack-healing on the contact strength of ceramics were examined. Si3 N4 /SiC composite ceramics with high crack-healing ability were used and the specimens were subjected to shot peening with several peening pressures and shot diameters. Then, some specimens subjected to SP were heat-treated in air to heal surface cracks introduced by shot peening. Sphere indentation tests were carried out on the specimens and investigated the Weibull distribution of the contact strength. As a result, it is found that the combination of shot peening and crack-healing is effective to increase contact strength and decrease the scatter of the contact strength.

Copyright © 2011 by ASME

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