Preparation of high-purity ZrSiO[sub 4] powder using sol-gel processing and mechanical properties of the sintered body

Journal Article · Tue Sep 01 04:00:00 EDT 1992 · Journal of the American Ceramic Society; (United States)

DOI:https://doi.org/10.1111/j.1151-2916.1992.tb05594.x· OSTI ID:7018931

Mori, T; Yamamura, H ^[1]; Kobayashi, H; Mitamura, T ^[2]

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1. Tsukuba Research Lab., TOSOH Co., Ltd., Tsukuba 305 (Japan)
2. Saitama Univ., Urawa (Japan). Faculty of Engineering

This paper reports that effects of the concentration of ZrOCl[sub 2], calcination temperature, heating rate, and the size of secondary particles after hydrolysis on the preparation of high-purity ZrSiO[sub 4] fine powders from ZrOCl[sub 2]:8H[sub 2]O (0.2M to 1.7M) and equimolar colloidal SiO[sub 2] using Sol--gel processing have been studied. Mechanical properties of the sintered ZrSiO[sub 4] from the high-purity ZrSiO[sub 4] powders have been also investigated. Single-phase ZrSiO[sub 4] fine powders were synthesized at 1300[degrees]C by forming ZrSiO[sub 4] precursors having a Zr---O---Si bond, which was found in all the hydrolysis solutions, and by controlling a secondary particle size after hydrolysis. The conversion rate of ZrSiO[sub 4] precursor gels to ZrSiO[sub 4] powders from concentrations other than 0.4M ZrOCl[sub 2][center dot]8H[sub 2]O increased when the heating rate was high, whereupon the crystallization of unreacted ZrO[sub 2] and SiO[sub 2] was depressed and the propagation and increase of ZrSiO[sub 4] nuclei in the gels were accelerated. The density of the ZrSiO[sub 4] sintered bodies, manufactured by firing the ZrSiO[sub 4] compacts at 1600[degrees] to 1700[degrees]C, was more than 95% of the theoretical density, and the grain size ranged around 2 to 4 [mu]m. The mechanical strength was 320 MPa (room temperature to 1400[degrees]C), and the thermal shock resistance was superior to that of mullite and alumina, with fairly high stability at higher temperatures.

• OSTI ID: 7018931
• Journal Information: Journal of the American Ceramic Society; (United States), Journal Name: Journal of the American Ceramic Society; (United States) Vol. 75:9; ISSN 0002-7820; ISSN JACTAW
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360203 -- Ceramics
Cermets
& Refractories-- Mechanical Properties
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
CHALCOGENIDES
CHEMICAL PREPARATION
CHEMICAL REACTIONS
COLLOIDS
DECOMPOSITION
DISPERSIONS
FABRICATION
HEAT TREATMENTS
HYDROLYSIS
LYSIS
MATERIALS WORKING
MECHANICAL PROPERTIES
MIXTURES
OXIDES
OXYGEN COMPOUNDS
PHASE STUDIES
POWDERS
SILICON COMPOUNDS
SILICON OXIDES
SINTERING
SOL-GEL PROCESS
SOLUTIONS
SOLVOLYSIS
SYNTHESIS
THERMOMECHANICAL TREATMENTS
TRANSITION ELEMENT COMPOUNDS
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES