Preparation and characterization of an Al2O3-ZrO2 nanocomposite, Part I: Powder synthesis and transformation behavior during fracture

An alumina-zirconia composite containing 5mol% zirconia was prepared by following a wet interaction process in aqueous medium via the sol-gel route. The formed hydrogel which was aged for proper growth and orientation at room temperature, was then dried at a low temperature to minimize agglomeration...

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Published inComposites. Part A, Applied science and manufacturing Vol. 38; no. 1; pp. 124 - 131
Main Authors SARKAR, D, ADAK, S, MITRA, N. K
Format Journal Article
LanguageEnglish
Published Oxford Elsevier 2007
Subjects
Applied sciences
Building materials. Ceramics. Glasses
Ceramic industries
Cermets, ceramic and refractory composites
Chemical industry and chemicals
Cross-disciplinary physics: materials science; rheology
Exact sciences and technology
Materials science
Miscellaneous
Other materials
Physics
Specific materials
Technical ceramics
Ceramic matrix composite
Scanning electron microscopy
B. Mechanical properties
D. Fractography
Mechanical properties
Fracture
Experimental study
Sol-gel processing
X ray diffraction
Precursor
Oxide ceramics
Composite material
Powder
Wet process
Transmission electron microscopy
Aqueous medium
Sol gel process
Technical ceramics
A. Nano-structures
Nanocomposite
Zirconium Oxides
Manufacturing
Alumina
Fractography
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Summary:An alumina-zirconia composite containing 5mol% zirconia was prepared by following a wet interaction process in aqueous medium via the sol-gel route. The formed hydrogel which was aged for proper growth and orientation at room temperature, was then dried at a low temperature to minimize agglomeration. The sol-gel derived precursor powder was properly characterized through determination of surface area, particle size and thermal analysis. The sintering behavior was studied by compacting the nano-powder through cold isostatic pressing where maximum densification of 98.4% was achieved at 1550 deg C. During Vickers indentation using a 5kg load, cracks were propagating around the grain boundaries and fractured the ZrO2 particles, which was associated with t-ZrO2 to m-ZrO2 transformation. Sintering was studied in the absence of a mineraliser.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:1359-835X
1878-5840
DOI:10.1016/j.compositesa.2006.01.005