Application of compositionally diphasic xerogels for enhanced densification: The system Al/sub 2/O/sub 3/-SiO/sub 2/

Journal Article · Tue Jul 01 04:00:00 EDT 1986 · J. Am. Ceram. Soc.; (United States)

OSTI ID:7195054

Komarneni, S; Suwa, Y; Roy, R

Stoichiometric mullite (71.38 wt% Al/sub 2/O/sub 3/-28.17 wt% SiO/sub 2/) and 80 wt% Al/sub 2/O/sub 3/-20 wt% SiO/sub 2/ gels were prepared by the single-phase and/or diphasic route. Dense sintered bodies were prepared from both sets of gels in the Al/sub 2/O/sub 3/-SiO/sub 2/ system. Apparent densities of 96% and 97% of theoretical density were measured for the diphasic (using two sols) mullite samples sintered at 1200/sup 0/ and 1300/sup 0/C for 100 min, respectively; this compared with 85% and 94% for the single-phase xerogels under the same conditions, and to much lower values for mullite prepared from conventional mixed powders. The microstructure of the mullite pellets from diphasic xerogel precursors is also considerably finer.

• Research Organization: Materials Research Lab., The Pennsylvania State Univ., University Park, PA 16802
• OSTI ID: 7195054
• Journal Information: J. Am. Ceram. Soc.; (United States), Journal Name: J. Am. Ceram. Soc.; (United States) Vol. 69:7; ISSN JACTA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360601* -- Other Materials-- Preparation & Manufacture
360603 -- Materials-- Properties
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CHALCOGENIDES
CHEMICAL PREPARATION
COLLOIDS
CRYSTAL STRUCTURE
DENSITY
DISPERSIONS
GELS
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
MATERIALS
MICROSTRUCTURE
MINERALS
MULLITE
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
POWDERS
QUANTITY RATIO
SILICON COMPOUNDS
SILICON OXIDES
SINTERED MATERIALS
STOICHIOMETRY
SYNTHESIS
TIME DEPENDENCE
VERY HIGH TEMPERATURE