Sintering of fine oxide powders. 1: Microstructural evolution

Journal Article · Sun Dec 01 04:00:00 EST 1996 · Journal of the American Ceramic Society

DOI:https://doi.org/10.1111/j.1151-2916.1996.tb08087.x· OSTI ID:422718

Chen, P L; Chen, I W ^[1]

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1. Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Materials Sciences and Engineering

Microstructural evolution during sintering has been investigated using fine powders of CeO{sub 2} and Y{sub 2}O{sub 3} 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.

• Sponsoring Organization: USDOE
• DOE Contract Number: FG02-87ER45302
• OSTI ID: 422718
• Journal Information: Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 12 Vol. 79; ISSN 0002-7820; ISSN JACTAW
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BULK DENSITY
CERIUM OXIDES
COMPACTING
EXPERIMENTAL DATA
MICROSTRUCTURE
PARTICLE SIZE
PORE STRUCTURE
POROSITY
POWDERS
SAMPLE PREPARATION
SINTERING
YTTRIUM OXIDES