UNSPECIFIED (2004) S-phase sialon ceramics; Microstructure and properties. In: 4th International Symposium on Nitrides, NOV 17-19, 2003, Mons, BELGIUM.

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Abstract

Sialon ceramics based on the composition of M2S10Al2O4N14 (M = Sr or Ba) have been sintered, at 1600-1750degreesC, to near-monophase ceramics. Sr loss during sintering results in higher residual silicate phase than in the Ba-stabilised form in which the measured S-phase composition is Ba2Si12-xAlxO2-xN16-x, with x = 2 +/- 0.2. The S-phase crystallises in elongated platelet morphology with preferred growth parallel to the orthorhombic c axis and primary facet planes parallel to (100) and (010). NMR spectroscopy of the Sr-S phase confirms the mixed SiN4/SiN3O tetrahedral coordination suggested from earlier x-ray studies. The Ba-S phase ceramic has an acoustically-measured Young modulus of >220 GPa, a hardness of 13.5 GPa and a fracture toughness of 4.5-5 MPa. rootm..

Item Type:	Conference Item (UNSPECIFIED)
Subjects:	T Technology > TP Chemical technology
Journal or Publication Title:	SILICATES INDUSTRIELS
Publisher:	BELGIAN CERAMIC SOCIETY
ISSN:	0037-5225
Date:	July 2004
Volume:	69
Number:	7-8 Sp. Iss. 2
Number of Pages:	7
Page Range:	pp. 225-231
Publication Status:	Published
Title of Event:	4th International Symposium on Nitrides
Location of Event:	Mons, BELGIUM
Date(s) of Event:	NOV 17-19, 2003
URI:	http://wrap.warwick.ac.uk/id/eprint/7983

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