Finite-difference model for the reaction sintering of oxide ceramics by direct oxidation of intermetallic powder compacts

A kinetic model for the reaction sintering of oxide ceramics in the system Al 2 O 3 –SiO 2 –ZrO 2 using mixtures of intermetallic compounds is presented. A 2D finite-difference model is developed to describe the exothermic gas-solid reactions taking place during the firing of ZrAl 3 /ZrSi 2 powder c...

Full description

Saved in:
Bibliographic Details
Published in:Journal of thermal analysis and calorimetry 2010-04, Vol.100 (1), p.33-42
Main Authors: Geßwein, H., Schlechtriemen, N., Binder, J. R., Haußelt, J.
Format: Article
Language:English
Subjects:
Activated sintering
Analysis
Analytical Chemistry
Applied sciences
Building materials. Ceramics. Glasses
Ceramic industries
Ceramic materials
Ceramics
Chemical industry and chemicals
Chemical properties
Chemistry
Chemistry and Materials Science
Exact sciences and technology
Finite difference method
General studies
Inorganic Chemistry
Intermetallic compounds
Intermetallics
Mathematical analysis
Mathematical models
Measurement Science and Instrumentation
Oxidation
Oxidation-reduction reaction
Oxides
Physical Chemistry
Polymer Sciences
Powders
Sintering
Technical ceramics
Two dimensional
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:A kinetic model for the reaction sintering of oxide ceramics in the system Al 2 O 3 –SiO 2 –ZrO 2 using mixtures of intermetallic compounds is presented. A 2D finite-difference model is developed to describe the exothermic gas-solid reactions taking place during the firing of ZrAl 3 /ZrSi 2 powder compacts. The model accounts for the oxidation kinetics of the powder particles, as well as the consumption and diffusion of gaseous oxygen through the porous matrix. Additionally, possible changes in the pore structure of the green body due to the oxidation reactions and sintering effects are incorporated in the model. The resulting differential equations are coupled with a two-dimensional Fourier heat balance equation leading to a system of nonlinear partial differential equations, which is solved by the numerical method of lines. The influence of different processing parameters like sample composition and heating cycle on the reaction sintering process is investigated and the model-predicted reaction behaviour is compared to experimental results.
ISSN:1388-6150
1588-2926
1572-8943
DOI:10.1007/s10973-009-0188-z