Glasse sialon

The important ceramic matrix materials are glass, silicon carbide, silicon nitride, alumina, glass-ceramics, sialons, intermetallics and some elemental materials. A list of some ceramic matrix materials is given in Table 3.5. 

With increasing zvalue the density of P-SiAlON decreases linearly, similarly lowering Young s modulus, strength, thermal conductivity, hardness and fracture toughness.30 On the other hand, for low zvalues (z< 1) the hardness and fracture toughness increase and when z > 1 they decrease. It has been also depicted that glass-free microstructures could be obtained in P-SiAlON polycrystals with substitutional level z> 2.31... 

Mandal, H., Thompson, D.P., Liu, Q., Gao, L. (1997), High temperature stability of a-SiAlON ceramics containing glass additions , Eur. J. Solid. State. Inorg. Chem., 34, 179. 

Xu, X., Mei, S., Ferreira, J.M.F. (2003), Fabrication of a-SiAlON sheets by tape casting and pressureless sintering , Department of Ceramics and Glass Engineering, CICECO, University of Aveiro, Portugal, www.mrs.org/publications/jmr/jmra/2003/ jun/012.html. 

Mandal, H. and Thompson, D.P., (2000), New heat treatment methods for glass removal from silicon nitride and sialon ceramics , J. Mater. Sci., 35 (24), 6285-6292. 

The extent of the glass-forming regions in various M-SiAlON systems (M = Mg, Y, Ca, Nd, etc.) has been studied (Hampshire etal., 1985) and represented using the Janecke prism, with compositions expressed in equivalents instead of atoms or gram-atoms. Thus, equivalent percentage (e/o) of cation M is given by ... 

Diaz, A., Hampshire, S. (2002), Crystallisation of M-SiAlON glasses to Iw-phase glass-ceramics preparation and characterization , J. Mater. Sci., 37, 723-30. 

Hampshire, S. (2003b), SiAlON glasses, their properties and crystallisation , Key Eng. Mater., 237, 239 16. 

Lemercier, H., Ramesh, R., Besson, J.-L., Liddell, K., Thompson, D.P., Hampshire, S. (1997), Preparation of pure B-phase glass-ceramic in the yttrium-sialon system , Key Eng. Mater., 132-136, 814-7. 

Pomeroy, M J., Nestor, E., Ramesh, R., Hampshires (2005), Properties and crystallisation of rare earth SiAlON glasses containing mixed trivalent modifiers J. Amer. Ceram. Soc., 88(4), 875-881. 

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