Processing and microstructure of mullite-zirconia composites prepared from sol-gel powders
A high-purity stoichiometric mullite precursor was obtained by hydrolysis of the alkoxides Al(OC/sub 3/H/sub 7/)/sub 3/ and Si(OC/sub 2/H/sub 5/)/sub 4/. Fully sintered mullite ceramics can be prepared from sol-gel powders by sintering them at 1600/sup 0/C for 4 h in air with the addition of 15 to 20 vol% ZrO/sub 2/ or 1 to 3 mol% Y/sub 2/O/sub 3/ or both. Introduction of 1 to 3 mol% Y/sub 2/O/sub 3/ aids the retention of tetragonal ZrO/sub 2/; the volume fraction of t-ZrO/sub 2/ retained increases with increasing Y/sub 2/O/sub 3/ content. The maximum t-ZrO/sub 2/ retained reaches 34% in a matrix of synthetic mullite with 3 mol% Y/sub 2/O/sub 3/, but most of this t-ZrO/sub 2/ does not undergo stress-induced transformation during grinding.
- Research Organization:
- Ceramic Div., Dept. of Materials Science and Engineering, Tianjin Univ., Tianjin
- OSTI ID:
- 5743534
- Journal Information:
- J. Am. Ceram. Soc.; (United States), Journal Name: J. Am. Ceram. Soc.; (United States) Vol. 69:3; ISSN JACTA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360201 -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
AIR
ALKOXIDES
CHALCOGENIDES
CHEMICAL PREPARATION
CHEMICAL REACTIONS
COMMINUTION
CRYSTAL STRUCTURE
DECOMPOSITION
FABRICATION
FLUIDS
GASES
GRINDING
HYDROLYSIS
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
LYSIS
MACHINING
MATERIALS
MICROSTRUCTURE
MINERALS
MULLITE
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
POWDERS
SINTERED MATERIALS
SINTERING
SOLVOLYSIS
STOICHIOMETRY
STRESS INTENSITY FACTORS
SYNTHESIS
TRANSITION ELEMENT COMPOUNDS
VERY HIGH TEMPERATURE
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES