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

Boccaccini, AR Olevsky, EA

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

44

INGLESE

Article

Material Science & Engineering

JOURNAL OF MATERIALS PROCESSING TECHNOLOGY

0924-0136 → ACNP

96

1-3

1999

92 - 101

ISI

0924-0136(19991101)96:1-3<92:POPGMC>2.0.ZU;2-5

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.