Sintering of fine oxide powders. 2: Sintering mechanisms

Journal Article · Sat Mar 01 04:00:00 EST 1997 · Journal of the American Ceramic Society

DOI:https://doi.org/10.1111/j.1151-2916.1997.tb02879.x· OSTI ID:474145

Chen, P L; Chen, I W ^[1]

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1. Univ. of Michigan, Ann Arbor, MI (United States)

Conventional and new sintering mechanisms have been investigated using fine powders of CeO{sub 2} and Y{sub 2}O{sub 3} of excellent sinterability. The authors have verified the validity of Herring`s scaling law for 60--84% relative density and found that it is consistent with grain-boundary-diffusion control. At lower densities, they have found that pores larger than the critical size, in the sense of Kingery and Francois, can still be sintered readily. This is rationalized by a new sintering mechanism based on particle repacking concurrent with particle coarsening, resulting in a higher packing factor. Very fine, surface-active powders that coarsen rapidly are uniquely capable of taking advantage of this new sintering mechanism, which along with their propensity to homogenization, accounts for their remarkable sinterability even at very low green densities.

• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: FG02-87ER45302
• OSTI ID: 474145
• Journal Information: Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 3 Vol. 80; ISSN 0002-7820; ISSN JACTAW
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BULK DENSITY
CERIUM OXIDES
DIFFUSION
GRAIN BOUNDARIES
KINETICS
MATHEMATICAL MODELS
PARTICLE SIZE
SINTERING
YTTRIUM OXIDES