Grain growth in nanocrystalline TiO sub 2 and its relation to vickers hardness and fracture toughness

Journal Article · Sat Dec 01 00:00:00 EST 1990 · Scripta Metallurgica; (United States)

OSTI ID:5547325

Hoefler, H J; Averback, R S ^[1]

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1. Dept. of Materials Science and Engineering, Univ. of Illinois at Urbana-Champaign, Urbana, IL (US)

This paper reports on scientific interest in ultra-fine grained powders for processing of ceramic components motivated by the possibilities for the enhancement of sintering rates, reduction in flaw sizes and low-temperature superplastic deformation. Previous works have developed a technique, which combines the methods established of inert gas condensation of small particles and in situ powder compaction, for synthesizing materials with grain sizes {lt}10 nm. It has been shown that this method can be adapted for the production of ceramic nanocrystalline particles. Subsequent work has demonstrated that enhanced sintering and superplastic deformation is possible in nanocrystalline ceramics (TiO{sub 2}), but not without significant grain growth. Control of grain growth, however, is necessary if the capability for synthesizing nanoscale powders is to have benefit for structural applications. It is well known that the initial particle size in green body compacts is not always indicative of the final grain sizes in fully sintered ceramic bodies. This study was initiated to examine grain growth kinetics in nanocrystalline materials. TiO{sub 2} was selected for this initial study since sintering, deformation and diffusion data are available.

• OSTI ID: 5547325
• Journal Information: Scripta Metallurgica; (United States), Vol. 24:12; ISSN 0036-9748
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
POWDERS
GRAIN SIZE
TITANIUM OXIDES
GRAIN ORIENTATION
CERAMICS
COPPER
DEFORMATION
PALLADIUM
SINTERING
VICKERS HARDNESS
CHALCOGENIDES
CRYSTAL STRUCTURE
ELEMENTS
FABRICATION
METALS
MICROSTRUCTURE
ORIENTATION
OXIDES
OXYGEN COMPOUNDS
PLATINUM METALS
SIZE
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
360202* - Ceramics
Cermets
& Refractories- Structure & Phase Studies
360203 - Ceramics
Cermets
& Refractories- Mechanical Properties
360201 - Ceramics
Cermets
& Refractories- Preparation & Fabrication