Processing of nanocrystalline ceramics

Conference · Mon Jan 01 04:00:00 EST 1990

OSTI ID:6724636

Ciftcioglu, M ^[1]; Mayo, M J ^[2]

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1. New Mexico Univ., Albuquerque, NM (USA). Center for Micro-Engineered Ceramics
2. Sandia National Labs., Albuquerque, NM (USA)

Methods of preparing non-agglomerated powders for three systems -- yttria, titania, and yttria-stabilized zirconia -- are reviewed. The non-agglomerated nature of these powders should make it possible to sinter them into dense ceramic bodies with nanocrystalline grain sizes. Experiments with yttria-stabilized zirconia have shown that this is indeed the case, with mean linear intercept grain sizes of 60 nm resulting from original powder particle diameters of 13 nm. This ultrafine-grained zirconia is shown, in turn, to have superplastic forming rates 34 times faster than a 0.3 {mu}m-grained commercial zirconia of the same composition. 7 refs., 9 figs.

• Research Organization: Sandia National Labs., Albuquerque, NM (USA)
• Sponsoring Organization: DOE/DP
• DOE Contract Number: AC04-76DP00789
• OSTI ID: 6724636
• Report Number(s): SAND-90-1639C; CONF-900466--78; ON: DE90015700
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
CHALCOGENIDES
CRYSTAL STRUCTURE
FABRICATION
GRAIN SIZE
MICROSTRUCTURE
OXIDES
OXYGEN COMPOUNDS
POWDERS
PRECIPITATION
SEPARATION PROCESSES
SINTERING
SIZE
STRAIN RATE
SYNTHESIS
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES