UNSPECIFIED (2000) Microstructural development of Nd, Gd and Yb-doped alpha '/beta ' sialons. In: 2nd International Symposium on Nitrides, JUN 09-11, 1998, LIMRICK, IRELAND.

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Abstract

Rare-earth doped sialons have been studied to compare the effects of different stabilising cations (Nd, Gd and Yb) on the phase content and microstructures of alpha'/beta' composites, and on the degree of alpha'-->beta' transformation following heat-treatment of the samples at 1450 degrees C. Heat-treatment of the Gd and Yb sialons resulted in crystallisation of the residual glassy phase into Gd-aluminate or Yb-garnet, respectively, with very little transformation of alpha' to beta' taking place. In contrast, heat-treatment of the Nd sialons readily promoted the transformation of alpha' to beta', with a corresponding evolution of Nd-Aluminate or Nd-Wollastonite. In addition, beta-Si3N4 additions were carried out to evaluate its effectiveness as a seeding aid for beta-sialon formation, such seeding mechanisms were effective in the Nd system but did not have a significant influence on beta sialon development in the Gd and Yb systems.

Item Type:	Conference Item (UNSPECIFIED)
Subjects:	T Technology > TA Engineering (General). Civil engineering (General)
Series Name:	MATERIALS SCIENCE FORUM
Journal or Publication Title:	NITRIDES AND OXYNITRIDES
Publisher:	TRANS TECH PUBLICATIONS LTD
ISBN:	0-87849-850-8
ISSN:	0255-5476
Editor:	Hampshire, S and Pomeroy, MJ
Date:	2000
Volume:	325-3
Number of Pages:	6
Page Range:	pp. 225-230
Publication Status:	Published
Title of Event:	2nd International Symposium on Nitrides
Location of Event:	LIMRICK, IRELAND
Date(s) of Event:	JUN 09-11, 1998
URI:	http://wrap.warwick.ac.uk/id/eprint/13132

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