Abstract
Silicon nitride ceramics containing 10 vol.% Yb2O3 and 0.5 vol.% Al2O3 were densified by gas pressure sintering at 1850°C and 10 MPa nitrogen pressure. The microstructural development of the samples was decisively controlled by the α/β-ratio of the initial starting powder and the sintering conditions. The resulting microstructures varied from fine grained to coarse-grained. Bending bars for quench tests in water at room temperature were machined out of larger sintered pieces in order to study the thermal shock behaviour. The remaining strength after quenching was measured in 4-point bending as a function of the quench temperature. The influence of the microstructure on the strength decrease (catastrophic or continuous) and the ultimate strength are discussed in terms of increasing fracture resistance curves for high strength ceramics.
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© 1993 Springer Science+Business Media Dordrecht
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Hoffmann, M.J., Schneider, G.A., Petzow, G. (1993). The Potential of Si3N4 for Thermal Shock Applications. In: Schneider, G.A., Petzow, G. (eds) Thermal Shock and Thermal Fatigue Behavior of Advanced Ceramics. NATO ASI Series, vol 241. Springer, Dordrecht. https://doi.org/10.1007/978-94-015-8200-1_5
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DOI: https://doi.org/10.1007/978-94-015-8200-1_5
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