Sintering characteristics of nanocrystalline TiO sub 2
- Department of Materials Science, Urbana, Illinois 61801 (USA) Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801 (USA)
The microstructural development of compacted nanocrystalline TiO{sub 2} powder was studied as a function of sintering temperature up to 1000 {degree}C. Grain growth was monitored using x-ray diffraction and scanning electron microscopy. The specific surface area and total porosity were determined quantitatively using the nitrogen adsorption BET. The density was measured by gravimetry using Archimedes principle. The green body density of compacted {ital n}-TiO{sub 2} with average grain size of 14 nm is as high as 75% of theoretical bulk density. Low temperature surface diffusion leads to the disappearance of small pores, while noticeable densification commences at 600 {degree}C and reaches near theoretical values at 900 {degree}C. Grain growth also begins at 600 {degree}C, accelerating rapidly by 1000 {degree}C. Hot isostatic pressing is observed to enhance densification while suppressing grain growth.
- DOE Contract Number:
- AC02-76ER01198
- OSTI ID:
- 6949054
- Journal Information:
- Journal of Materials Research; (USA), Vol. 5:3; ISSN 0884-2914
- Country of Publication:
- United States
- Language:
- English
Similar Records
Sintering characteristics of nanocrystalline TiO sub 2 ---A study combining small angle neutron scattering and nitrogen absorption--BET
Sinter-forging of nanocrystalline zirconia. 1: Experimental
Related Subjects
TITANIUM OXIDES
MICROSTRUCTURE
ADSORPTION
COMPACTS
DENSITY
DIFFUSION
GRAVIMETRY
HIGH TEMPERATURE
MONITORING
N-TYPE CONDUCTORS
NITROGEN
POROSITY
SCANNING ELECTRON MICROSCOPY
SINTERING
SURFACE PROPERTIES
TEMPERATURE DEPENDENCE
VERY HIGH TEMPERATURE
X-RAY DIFFRACTION
CHALCOGENIDES
COHERENT SCATTERING
CRYSTAL STRUCTURE
DIFFRACTION
ELECTRON MICROSCOPY
ELEMENTS
FABRICATION
MATERIALS
MICROSCOPY
NONMETALS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SCATTERING
SEMICONDUCTOR MATERIALS
SORPTION
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
360201* - Ceramics
Cermets
& Refractories- Preparation & Fabrication
360202 - Ceramics
Cermets
& Refractories- Structure & Phase Studies
360204 - Ceramics
Cermets
& Refractories- Physical Properties