Sintering of Fine Oxide Powders: I, Microstructural Evolution

Microstructural evolution during sintering has been investigated using fine powders of CeO2 and Y2O3 with excellent sinterability. A universal pore size distribution, normalized by particle size, has been determined and found to be a function of density only. Microstructure evolves toward the univer...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 1996-12, Vol.79 (12), p.3129-3141
Main Authors: Chen, Pei-Lin, Chen, I-Wei
Format: Article
Language:English
Subjects:
Applied sciences
Austenitic stainless steels
Building materials. Ceramics. Glasses
Ceramic industries
Ceramics
Chemical industry and chemicals
Evolution
Exact sciences and technology
Microstructure
Miscellaneous
Oxides
Sintering (powder metallurgy)
Technical ceramics
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Summary:Microstructural evolution during sintering has been investigated using fine powders of CeO2 and Y2O3 with excellent sinterability. A universal pore size distribution, normalized by particle size, has been determined and found to be a function of density only. Microstructure evolves toward the universal distribution, with or without densification, signifying homogenization at all stages. This may even involve the elimination of supercritical pores, at low densities, which are otherwise thermodynamically not sinterable. Theoretical justification for these observations is made by using a network model with a random, but spatially homogeneous, distribution of spherical particles. Final microstructure after full density is reached is also found to evolve toward a universal steady state of grain shape/grain size distribution regardless of initial state.
ISSN:0002-7820
1551-2916
DOI:10.1111/j.1151-2916.1996.tb08087.x