By Low I.M. (ed.)
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Extra resources for Ceramic matrix composites. Microstructure, properties and applications
No shrinkage (unlike sintering or hot-pressing), but does result in a residual porosity of the order of 23%. 12 As the RBSN composite consists of Si3N4 directly bonded to itself and the whiskers, this material is less prone to creep at elevated temperatures but may be more susceptible to oxidation due to the higher porosity levels. As the silicon powder compact can be formed by conventional powder processing routes (pressing, extrusion, casting), there is a choice in whether or not the whisker reinforcement is oriented, with no effect on the reaction bonding process.
75(7) 1715–1728. 18. G. (1990), ‘Perspective on the development of high-toughness ceramics’, J. Am. Ceram. , 73(2) 187–206. 19. A. (1999), ‘Crack deflection in ceramic composites and fiber coating design criteria’, Composites, A30, 521–524. 20. Okamura, K. (1995), ‘Ceramic-Matrix Composites (CMC)’, Adv. Comp. , 4(3) 247–259. 21. E. (1964), ‘A mechanism for the control of crack propagation in all-brittle systems’, Proc. Roy. Soc. , 282, 508–520. © Woodhead Publishing Limited, 2006 Fibrous monolithic ceramics 31 22.
3 Another important modification of the processing parameters by the presence of SiC(w) is that of the kinetics of the α → β transformation. This transformation is well known in monolithic Si3N4 ceramics to improve the fracture toughness by the development of elongated β-grains. The presence of SiC(w) retards the α → β phase transformation, thus reducing this beneficial effect. Si3N4(w) reinforced Si3N4 As mentioned earlier, this type of microstructure can be obtained by adding silicon nitride whiskers to the Si3N4 powder as for SiC whisker composites or more commonly by the growth of large and elongated β-grains from rodlike β-seed crystals in an otherwise equiaxed β-Si3N4 matrix during sintering.
Ceramic matrix composites. Microstructure, properties and applications by Low I.M. (ed.)