Time-temperature-transformation curves for kaolinite-[alpha]-alumina

Journal Article · Wed Jun 01 00:00:00 EDT 1994 · Journal of the American Ceramic Society; (United States)

DOI:https://doi.org/10.1111/j.1151-2916.1994.tb09755.x· OSTI ID:7072479

Liu, K C; Thomas, G ^[1]; Caballero, A; Moya, J S; Aza, S de ^[2]

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1. Univ. of California, Berkeley, CA (United States). Dept. of Materials Science and Mineral Engineering
2. CSIC, Madrid (Spain). Dept. of Ceramics

The C-shaped time-temperature-transformation curves (T-T-T curves) of crystobalite formation and the L-shaped T-T-T curves of [alpha]-alumina reaction were established for a high-purity kaolinite-[alpha]-alumina mixture during heating. The results revealed that crystobalite formation in kaolinite was retarded by the presence of [alpha]-alumina between 1,250 and 1,350 C and was totally prohibited above 1,380 C due to the reaction of kaolinite with [alpha]-alumina to form secondary mullite. The reaction of [alpha]-alumina with kaolinite was initiated at about 1,250 C. It became quite extensive above 1,380 C and was extremely fast at 1,600 C and above, indicating the strong effect of the eutectic liquid formation at [approximately]1,587 C in silica-alumina. The effectiveness of the established T-T-T curves was demonstrated and discussed. The reaction of kaolinite with alumina is of interest in the production of mullite by reaction sintering, and hence the kinetics of this reaction are of fundamental and practical interest.

• DOE Contract Number: AC03-76SF00098
• OSTI ID: 7072479
• Journal Information: Journal of the American Ceramic Society; (United States), Journal Name: Journal of the American Ceramic Society; (United States) Vol. 77:6; ISSN 0002-7820; ISSN JACTAW
• 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
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
ALUMINIUM SILICATES
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CRISTOBALITE
CRYSTAL-PHASE TRANSFORMATIONS
DATA
EXPERIMENTAL DATA
FABRICATION
INFORMATION
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
KAOLINITE
KINETICS
MATERIALS
MINERALS
MULLITE
NUMERICAL DATA
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
REACTION KINETICS
SILICATE MINERALS
SILICATES
SILICON COMPOUNDS
SINTERING