Particle interactions in zirconia-toughened alumina

Journal Article · Sat Jul 01 04:00:00 EDT 1989 · Journal of the American Ceramic Society; (USA)

DOI:https://doi.org/10.1111/j.1151-2916.1989.tb09720.x· OSTI ID:5372697

Wilfinger, K R ^[1]; Cannon, W R ^[2]

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1. Lawrence Livermore National Lab., CA (USA)
2. Rutgers--the State Univ., Piscataway, NJ (USA). Center for Ceramics Research

In order to determine the effect of the coarse tail of the ZrO/sub 2/ size distribution of the monoclinic ZrO/sub 2/ content of zirconia-toughened alumina, quantitative hot-stage X-ray measurements were made on AL/sub 2/O/sub 3/-10% ZRO/sub 2/ (submicrometer with a coarse tail >1 {mu}m), Al/sub 2/O/sub 3/-10% ZrO/sub 2/ with the coarse tail of the ZrO/sub 2/ carefully removed by centrifugation, and Al/sub 2/O/sub 3/-10% ZrO/sub 2/ in which 10% of ZrO/sub 2/(1) and 90% of ZrO/sub 2/(2) were used. The monoclinic content of the third measurement was compared with the weighted average of the first two. A disproportionate amount of monoclinic ZrO/sub 2/ was found in the third and its was concluded that transformation of the coarse particles promotes transformation in finer particles. Microstructural examination supports this conclusion. Results are interpreted as being due both to autocatalytic transformation and to constraint relief from microcracking.

• OSTI ID: 5372697
• Journal Information: Journal of the American Ceramic Society; (USA), Journal Name: Journal of the American Ceramic Society; (USA) Vol. 72:7; ISSN JACTA; ISSN 0002-7820
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360203 -- Ceramics
Cermets
& Refractories-- Mechanical Properties
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COHERENT SCATTERING
CRACKING
CRYSTAL STRUCTURE
DECOMPOSITION
DIFFRACTION
KINETICS
MICROSTRUCTURE
OXIDES
OXYGEN COMPOUNDS
PARTICLES
PHASE TRANSFORMATIONS
PYROLYSIS
REACTION KINETICS
SCATTERING
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS
X-RAY DIFFRACTION
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES