Determination of Fracture Toughness of SiC-Whiskers Reinforced Si3N4 by Two Different Techniques

  • P. Bosetti
  • V. M. Sglavo
Chapter

Abstract

In this work the fracture toughness of a Si3N4-SiCW composite was measured at temperatures up to 1000°C by two different techniques. In a first case, K Ic , was evaluated from the analysis of the stable growth of indentation cracks upon bending. In the second approach, long through-thickness cracks were obtained by a novel technique and the fracture toughness was determined from the bending strength of these samples. At room temperature values of K Ic equal to ≈4 MPa m1/2 and ≈7 MPa m1/2 were obtained by the indentation technique and by the notched specimens, respectively. The difference between K Ic values was related to the smaller crack opening which accounts for a higher toughening effect in long through-thickness cracks. Fracture toughness was observed to decrease at temperatures higher than 800°C, this effect being stronger in the notched samples.

Keywords

Fracture Toughness Crack Length Crack Open Displacement Sandwich Beam Indentation Technique 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    P.B. Becher and T.N. Tiegs, Adv. Ceram. Mat., 4, 2, 143 (1988).Google Scholar
  2. 2.
    J.B. Watchman, in: Mechanical properties of Ceramics, J. Wiley Sons, New York, USA, 221–234 (1996).Google Scholar
  3. 3.
    T. Yonezawa, S. Saitoh, M. Minamizawa and T. Matsuda, Compos. Set. Technol., 51, 265–69 (1994).CrossRefGoogle Scholar
  4. 4.
    P.F. Becher, J. Am. Ceram. Soc., 74, 2, 255–69 (1991).CrossRefGoogle Scholar
  5. 5.
    V.M. Sglavo and P. Pancheri, J. Eur. Ceram. Soc., 17, 1697 (1997).CrossRefGoogle Scholar
  6. 6.
    P. Pancheri, P. Bosettl, R. Dal Maschio and V.M. Sglavo, to be published on Eng. Frac. Mech. Google Scholar
  7. 7.
    V.M. Sglavo, P. Bosetti, E. Trentini and M. Ceschini, to be published on J. Am. Ceram. Soc. Google Scholar
  8. 8.
    J.C. Newman and I.S. Raju, Eng. Frac. Mech., 15, 185 (1981).CrossRefGoogle Scholar
  9. 9.
    T. Nose and T. Fujii, J. Am. Ceram. Soc., 71, 5, 328 (1988).CrossRefGoogle Scholar
  10. 10.
    B. Lawn, in: Fracture of Brittle Solids, Second Edition, Cambridge University Press, Cambridge, Great Britain, 249–306 (1993).Google Scholar
  11. 11.
    D. Bleise and R.W. Steinbrech, J. Am. Ceram. Soc., 77, 2, 315 (1994).CrossRefGoogle Scholar
  12. 12.
    R.W. Steinbrech, F. Deuerler, A. Reichl and W. Schaarwächter, Sci. Ceram., 14, 695–64 (1988).Google Scholar
  13. 13.
    T. Fett, Eng. Frac. Mech., 52, 4, 773–6 (1995).CrossRefGoogle Scholar
  14. 14.
    P.L. Swanson, C.J. Fairbanks, B.R. Lawn, Y. Mai and B.J. Hockey, J Am. Ceram. Soc., 70, 4, 279–89 (1987).CrossRefGoogle Scholar
  15. 15.
    R.W. Steinbrech, A. Reichl, W. Shaarwächter, J. Am. Ceram. Soc., 73, 7, 2009–15 (1990).CrossRefGoogle Scholar
  16. 16.
    P.F. Becher, C. Hsueh, K.B. Alexander and E.Y. Sun, J. Am. Ceram. Soc., 79, 2, 298304 (1996).Google Scholar

Copyright information

© Springer Science+Business Media New York 2002

Authors and Affiliations

  • P. Bosetti
    • 1
  • V. M. Sglavo
    • 1
  1. 1.Dipartimento di Ingegneria dei MaterialiUniversità di TrentoTrentoItaly

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