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Journal of Materials Science

, Volume 42, Issue 18, pp 7920–7926 | Cite as

Correlation between fracture toughness and microstructure of seeded silicon nitride ceramics

  • D. Bučevac
  • S. Bošković
  • B. Matović
  • Lj. Živković
  • M.  Vlajić
  • Vladimir KrstićEmail author
Article

Abstract

Microstructure development and fracture toughness of Si3N4 composites were studied in the presence of seeds and Al2O3 + Y2O3 as sintering aids. The elongated β-Si3N4 seeds were introduced into two different α-Si3N4 matrix powders; one was the ultra fine powder matrix and the other was the coarse powder matrix. The amount of seeds varied from 0 to 6 wt%. The grain growth inhibition and the mechanism of toughening were discussed and correlated with microstructure. The maximum fracture toughness of 9.0 MPa m1/2 was obtained for ultra fine powder with 5 wt% seeds hot pressed at 1,700 °C for 6 h.

Keywords

Aspect Ratio Fracture Toughness Y2O3 Silicon Nitride High Fracture Toughness 

Notes

Acknowledgements

This work has been supported by the Ministry of Science and Environmental Protection of the Republic of Serbia and the Ministry of Economic Development and Trade of Ontario.

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Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  • D. Bučevac
    • 1
  • S. Bošković
    • 1
  • B. Matović
    • 1
  • Lj. Živković
    • 2
  • M.  Vlajić
    • 3
  • Vladimir Krstić
    • 3
    Email author
  1. 1.Institute of Nuclear Sciences VinčaBelgradeSerbia and Montenegro
  2. 2.Faculty of Electronic EngineeringUniversity of NišNisSerbia and Montenegro
  3. 3.Centre for Manufacturing of Advanced Ceramics and NanomaterialsQueens UniversityKingstonCanada

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