PREPARATION OF Y-ALPHA-SIALON WITH GLASSY OR CRYSTALLINE PHASES AT GRAIN-BOUNDARIES

Authors
MIN JW MITOMO M
Citation
Jw. Min et M. Mitomo, PREPARATION OF Y-ALPHA-SIALON WITH GLASSY OR CRYSTALLINE PHASES AT GRAIN-BOUNDARIES, Ceramics international, 21(6), 1995, pp. 427-432
Citations number
19
Categorie Soggetti
Material Science, Ceramics
Journal title
Ceramics international → ACNP
ISSN journal
02728842
Volume
21
Issue
6
Year of publication
1995
Pages
427 - 432
Database
ISI
SICI code
0272-8842(1995)21:6<427:POYWGO>2.0.ZU;2-A
Abstract
The phase stability of alpha-sialon has been investigated on a Y-alpha -sialon - Y2O3-Al2O3 plane. Y-alpha-sialon was stable with YAG liquid composition at 1750 degrees C which could be devitrified to YAG (3Y(2) O(3) . 5Al(2)O(3)) by post heat treatment at 1500 degrees C for 4 h. W ith increase of Al2O3 in the liquid composition of YAG, the amount of beta-sialon increased. On the other hand, with increase of Y2O3 in the liquid composition, the amount of melilite (Si3N4 . Y2O3) increased. The changes of unit-cell parameters and microstructures with respect t o the compositions and amounts of the liquid phase were also discussed .