Preparation of zirconia coatings by hydrolysis of zirconium alkoxide with hydrogen peroxide

Journal Article · Thu Apr 01 00:00:00 EST 1993 · Journal of the American Ceramic Society; (United States)

DOI:https://doi.org/10.1111/j.1151-2916.1993.tb05337.x· OSTI ID:5989636

Sakurai, Chihiro; Fukui, Toshimi; Okuyama, Masahiko ^[1]

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1. Colloid Research Inst., Kitakyushu (Japan)

Zirconia has gained a great deal of attention because of its superior properties of mechanical strength, chemical resistance, and ionic conductivity. Zirconia coatings and thin films are receiving attention as tribological and thermal barrier coatings for engines, high-reflective coatings, solid electrolytes for fuel cells, oxygen sensors, etc. The sol-gel coating method has several advantages, such as low processing temperatures, homogeneity, control of micro-structure, and good productivity compared to chemical vapor deposition and physical vapor deposition. However, there are few reports concerning the preparation of zirconia coatings and thin films by the sol-gel method. Up to the present, zirconia coatings have been prepared from zirconium propoxide (not heated), zirconium tetrabutoxide modified by acetylacetone and ethyl acetoacetate, zirconium diethoxydichloride (ZrCl[sub 2](OC[sub 2]H[sub 5])[sub 2]), and a hydrosol prepared from a zirconium oxychloride solution. Coatings of 8.8-mol%-yttria-doped zirconia were fabricated using a transparent and spinnable sol prepared by hydrolysis of zirconium alkoxide with hydrogen peroxide and nitric acid. The sol gave a crack-free coating film consisting of fine grains. The crystalline phase was cubic after heating of 1,000 and 1,200 C and cubic and tetragonal at 1,350 C, with the coating being highly oriented in the (111) plane, especially at 1,000 C. Activation energy of the coating films was higher than that of the bulk. Transmittance through a film thickness of about 0.3 [mu]m on each side was 75%.

• OSTI ID: 5989636
• Journal Information: Journal of the American Ceramic Society; (United States), Vol. 76:4; ISSN 0002-7820
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
36 MATERIALS SCIENCE
ALKOXIDES
HYDROLYSIS
YTTRIUM OXIDES
CHEMICAL PREPARATION
ELECTRICAL PROPERTIES
OPTICAL PROPERTIES
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES
ACTIVATION ENERGY
ALUMINIUM OXIDES
COATINGS
DOPED MATERIALS
EXPERIMENTAL DATA
FLOWSHEETS
GRAIN SIZE
HYDROGEN PEROXIDE
NITRIC ACID
ALUMINIUM COMPOUNDS
CHALCOGENIDES
CHEMICAL REACTIONS
DATA
DECOMPOSITION
DIAGRAMS
ENERGY
HYDROGEN COMPOUNDS
INFORMATION
INORGANIC ACIDS
LYSIS
MATERIALS
MICROSTRUCTURE
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PEROXIDES
PHYSICAL PROPERTIES
SIZE
SOLVOLYSIS
SYNTHESIS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
400201* - Chemical & Physicochemical Properties
360204 - Ceramics
Cermets
& Refractories- Physical Properties