By Low I.M. (ed.)
ISBN-10: 0849334764
ISBN-13: 9780849334764
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Additional info for Ceramic matrix composites. Microstructure, properties and applications
Example text
Advanced Ceramics Research, 3292 East Hemisphere Loop, Tucson, AZ 857055013, USA. 29. W. (2004), ‘Thermal shock resistance of fibrous monolithic Si3N4/BN ceramics’, J. Eur. Ceram. , 24(8) 2339–2347. 30. W. (1998), ‘Crack deflection and propagation in layered silicon nitride/boron nitride ceramics’, J. Am. Ceram. , 81, 1004–1012. 31. W. (2001), ‘In-plane fracture resistance of a cross-ply fibrous monolith’, J. Am. Ceram. , 84, 367–375. 32. W. , and de Arellano-López, A. , 46, 747– 751. 33. W. (1989), ‘Crack deflection at an interface between dissimilar elastic materials’, Int.
19). The increase in WOF after thermal shock suggests that thermal shock reduces the interfacial crack resistance of the cell boundary, which is a composite of boron nitride and glass. Thermal shock damage seems to be absorbed by pre-existing microcracks within the BN cell boundaries [1, 24], which would decrease the cell boundary fracture resistance, enabling easier crack deflection and higher WOF. Koh and colleagues suggested models to explain the thermal shock resistance of Si3N4/BN FMs, as shown in Fig.
Longer hot-pressing times or higher pressing temperatures will enhance the formation of elongated grains and will be accompanied by an increase in R-curve behaviour. 26 materials with a broad grain diameter distribution and with a large fraction of elongated grains exhibit only a modest increase in toughness combined with a lower strength. 26 The microstructure developed in such cases comprises large elongated grains embedded in a fine matrix. From a microstructural aspect, increasing the size of the reinforcing grains will enhance contributions from both frictional bridging and pullout.
Ceramic matrix composites. Microstructure, properties and applications by Low I.M. (ed.)
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