Synthesis, characterization, and properties of nanophase ceramics

Conference · Wed Feb 01 04:00:00 EST 1989

DOI:https://doi.org/10.1557/PROC-132-3· OSTI ID:6292826

Siegel, R W; Eastman, J A

Ultrafine-grained ceramics have been synthesized by the production of ultrafine (2-20 nm) particles, using the gas-condensation method, followed by their in-situ, ultra-high vacuum consolidation at room temperature. These new nanophase ceramics have properties that are significantly improved relative to those of their coarser-grained, conventionally-prepared counterparts. For example, nanophase rutile (TiO/sub 2/) with an initial mean grain diameter of 12 nm sinters at 400 to 600/degree/C lower temperatures than conventional powders, without the need for compacting or sintering aids. The sintered nanophase rutile exhibits both improved microhardness and fracture characteristics. These property improvements result from the reduced scale of the grains and the increased cleanliness of the particle surfaces and the subsequently-formed grain boundaries. Research completed on the synthesis, characterization, and properties of nanophase ceramics is reviewed and the potential for using the nanophase synthesis method for engineering new and/or improved ceramics and composites is considered. 21 refs., 5 figs.

• Research Organization: Argonne National Lab., IL (USA)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 6292826
• Report Number(s): CONF-881155-60; ON: DE89009863
• 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
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CERAMICS
CHALCOGENIDES
CRYSTAL STRUCTURE
FABRICATION
GRAIN SIZE
HARDNESS
HIGH VACUUM
LASER SPECTROSCOPY
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
MECHANICAL PROPERTIES
MICROSTRUCTURE
OXIDES
OXYGEN COMPOUNDS
PARTICLE SIZE
RAMAN SPECTROSCOPY
SINTERING
SIZE
SPECTROSCOPY
SYNTHESIS
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS