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.
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Bosetti, P., Sglavo, V.M. (2002). Determination of Fracture Toughness of SiC-Whiskers Reinforced Si3N4 by Two Different Techniques. In: Bradt, R.C., Munz, D., Sakai, M., Shevchenko, V.Y., White, K. (eds) Fracture Mechanics of Ceramics. Springer, Boston, MA. https://doi.org/10.1007/978-1-4757-4019-6_15
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DOI: https://doi.org/10.1007/978-1-4757-4019-6_15
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