Abstract
Samples of hot-pressed silicon nitride were tested in 3-point bend impact loading at ambient temperature, 1100°C, 1250°C, and 1400°C under isothermal conditions. Dynamic stress intensity factors (KIC) were calculated from the fracture load and the dimensions of an induced surface flaw, produced by a Knoop hardness indenter. Dynamic stress intensities of about 5.25 MN/m3/2 were determined for all temperatures up to 1250°C. A 20% drop in KIC was found at 1400°C. This drop in KIC coincides with a change in the fracture surface at the same temperature, indicating a change in the micromechanics of fracture at 1400°C.
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© 1978 Plenum Press, New York
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Gonczy, S.T., Johnson, D.L. (1978). Impact Fracture of Ceramics at High Temperature. In: Bradt, R.C., Hasselman, D.P.H., Lange, F.F. (eds) Flaws and Testing. Fracture Mechanics of Ceramics, vol 3. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-7017-2_29
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DOI: https://doi.org/10.1007/978-1-4615-7017-2_29
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