Dissemination of IT for the Promotion of Materials Science (DoITPoMS)

DoITPoMS Micrograph Library Full Record for Micrograph 195
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Full Record for Micrograph 195

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Micrograph no
195
Brief description
Zirconia Toughened Alumina (ZTA)
Keywords
alumina Link to MATTER Glossary entry for alumina, ceramic Link to MATTER Glossary entry for ceramic, composite material Link to MATTER Glossary entry for composite material, toughness Link to MATTER Glossary entry for toughness, zirconia
Categories
Ceramic, Composite
System
ZrO2-Al2O3
Composition
ZrO2 5-30, Al2O3 70-95 (wt%)
Standard codes
Reaction
Processing
Oxide powder mixtures are hot pressed or pressureless sintered at <1600ºC.
Applications
Wear, bearing and pump components and in cutting tools.
Sample preparation
Polished and unetched.
Technique
Scanning electron microscopy (SEM) in backscattered electron imaging (BEI) mode
Length bar
10 μm
Further information
The ZrO2 addition to Al2O3 increases its toughness via the tetragonal to monoclinic ZrO2 transformation, so called transformation toughening and microcracking. The bright zirconia can be inter- or intra-granular.
Contributor
Prof W E Lee
Organisation
Department of Engineering Materials, University of Sheffield
Date
02/09/02
Licence for re-use
Attribution-Non-Commercial-Share Alike 2.0 UK: England & Wales