Sinter-forging of nanophase TiO sub 2

Journal Article · Sun Mar 01 00:00:00 EST 1992 · Scripta Metallurgica; (United States)

OSTI ID:5577213

Uchic, M; Hofler, H J; Flick, W J; Tao, R; Averback, R S ^[1]; Kurath, P ^[2]

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1. Illinois Univ., Urbana, IL (United States). Dept. of Materials Science and Engineering
2. Illinois Univ., Urbana, IL (United States). Dept. of Mechanical Engineering

Considerable effort has been directed in recent years to developing ceramic materials that can be both sintered to full density at low temperatures and processed by superplastic forming. One strategy for achieving this goal has been to reduce the particle size of the starting powder, and by anaphase processing, particles of sizes less than {approx}10 nm can now be realized. Indeed, recent studies on nanophase ceramics have demonstrated that sintering temperatures can be reduced dramatically and that nanophase ceramics have excellent potential for superplastic forming. Nevertheless, the grain growth that occurs during the processing of these new materials restricts their applicability. In nanophase (n-) TiO{sub 2}, some progress in controlling grain size has been achieved by using dopants or hot pressing. Sinter-forging offers another means to achieve this goal, although this method has been applied mostly to materials with larger grains. Studies of sinter-forging are also useful for elucidating the mechanisms of sintering and creep in ceramic materials. In the present paper, the authors examine the characteristics of sinter-forging in n-TiO{sub 2}. Only limited studies of sinter-forging have thus far been performed on well characterized powders of comparable size, and even these had a somewhat larger grain size.

• OSTI ID: 5577213
• Journal Information: Scripta Metallurgica; (United States), Vol. 26:5; ISSN 0036-9748
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
POWDERS
PARTICLE SIZE
TITANIUM OXIDES
FORGING
PLASTICITY
SINTERING
THERMODYNAMIC PROPERTIES
DENSITY
GRAIN BOUNDARIES
PROCESS CONTROL
SUPERLATTICES
CHALCOGENIDES
CONTROL
CRYSTAL STRUCTURE
FABRICATION
MATERIALS WORKING
MECHANICAL PROPERTIES
MICROSTRUCTURE
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SIZE
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
360203* - Ceramics
Cermets
& Refractories- Mechanical Properties
360202 - Ceramics
Cermets
& Refractories- Structure & Phase Studies
360204 - Ceramics
Cermets
& Refractories- Physical Properties
360201 - Ceramics
Cermets
& Refractories- Preparation & Fabrication