Processing of platelet-reinforced glass matrix composites: effect of inclusions on sintering anisotropy

Citation
Ar. Boccaccini et Ea. Olevsky, Processing of platelet-reinforced glass matrix composites: effect of inclusions on sintering anisotropy, J MATER PR, 96(1-3), 1999, pp. 92-101
Citations number
44
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Material Science & Engineering
Journal title
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
ISSN journal
0924-0136 → ACNP
Volume
96
Issue
1-3
Year of publication
1999
Pages
92 - 101
Database
ISI
SICI code
0924-0136(19991101)96:1-3<92:POPGMC>2.0.ZU;2-5
Abstract
The effect of rigid, i.e. non-densifying inclusions on the densification ki netics and shrinkage anisotropy during the sintering of composite glass pow der compacts is investigated. The experimental study was conducted on bariu m-magnesium aluminosilicate (BMAS) glass composites containing Al2O3-platel ets as a rigid inclusion phase. Data on axial and radial shrinkage during s intering were obtained by using heating microscopy, which allows monitoring the densification process without the exertion of external loads, which co uld influence the sintering kinetics. The presence of rigid platelets retar ded the densification of the compacts. The sintering behavior of all sample s was anisotropic, with the degree of anisotropy varying with the progress of sintering and with the platelet content. A comprehensive qualitative exp lanation for the effect of rigid inclusions on sintering shrinkage anisotro py for both intrinsically isotropic and anisotropic powder compacts is offe red. In general, the influence of rigid inclusions on shrinkage anisotropy can be explained on the basis of the retardation effect that inclusions hav e on the sintering and densification kinetics of porous glass compacts. The ideas advanced in this paper form the basis for the development of a predi ctive theoretical model for the effect of rigid inclusions on shrinkage ani sotropy of glass powder compacts during sintering. (C) 1999 Elsevier Scienc e S.A. All rights reserved.