Basu, B., Lewis, M. H., Smith, Mark E., Bunyard, M. and Kemp, Thomas F.. (2006) Microstructure development and properties of novel Ba-doped phase Sialon ceramics. JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, 26 (16). pp. 3919-3924. ISSN 0955-2219

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Abstract

Herein, we report the microstructure and properties of the newly developed near monophasic S-Sialon ceramic, based on the composition of Ba2Si12-xAlxO2+xN16-x (x=20.2). Appropriate amount of the precursor powders (BaCO3, alpha-Si3N4, AlN, Al2O3) with a targeted composition of BaAlSi5O2N7 was ball milled and hot pressed to full density in the temperature range of 1600-1750 degrees C for 2 In in nitrogen atmosphere. Extensive transmission electron microscopy (TEM) study has been conducted to understand the microstructure development and characterise the various morphological features in hot pressed S-Sialon. The sintering mechanism is based on the liquid phase sintering route, which involves the formation of a Ba-Al silicate liquid (< 5%) with dissolved nitrogen at intergranular pockets. The experimental observation suggests that the S-phase crystallises in elongated platelet morphology with preferred growth parallel to the orthorhombic V axis and primary facet planes parallel to (100) and (010). The Ba-S-phase ceramic has an acoustically measured Young modulus of 210-230 GPa, a hardness of 13 GPa and a fracture toughness of 4 MPa m(1/2), little lower than typical of a ceramic with morphologically anisotropic grains contributing to bridging and pullout mechanisms. (c) 2006 Elsevier Ltd. All rights reserved.

Item Type:	Journal Article
Subjects:	T Technology > TP Chemical technology
Journal or Publication Title:	JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Publisher:	ELSEVIER SCI LTD
ISSN:	0955-2219
Date:	2006
Volume:	26
Number:	16
Number of Pages:	6
Page Range:	pp. 3919-3924
Identification Number:	10.1016/j.jeurceramsoc.2006.01.004
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/32852

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