Zirconia toughened alumina: Difference between revisions
It is also known in industry as "ZTA". |
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==External links== |
==External links== |
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* [http://www.makeitfrom.com/data/?material=ZTA Material Properties Data: Zirconia-Toughened Alumina (ZTA)] |
* [http://web.archive.org/web/20100401132910/http://www.makeitfrom.com:80/data/?material=ZTA Material Properties Data: Zirconia-Toughened Alumina (ZTA)] |
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[[Category:Ceramic materials]] |
[[Category:Ceramic materials]] |
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Revision as of 22:23, 20 July 2016
Zirconia toughened alumina is a ceramic material comprising alumina and zirconia. It is a composite ceramic material with zirconia grains in the allumina matrix.
It is also known in industry as ZTA.
Zirconia aluminia (or zirconia toughened alumina), a combination of zirconium oxide and aluminum oxide, is part of a class of composite ceramics called AZ composites. Noted for their mechanical properties, AZ composites are commonly used in structural applications, as cutting tools, and in many medical applications. Additionally, AZ composites feature high strength, fracture toughness, elasticity, hardness, and wear resistance. Zirconia toughened alumina (ZTA), in particular, offers several key properties.
The mechanical robustness compared to alumina is attributed to the displacive phase transformation of the metastable tetragonal ziroconia grains when the material is stressed. The stress concentration at a crack tip can cause a transformation from a tetragonal crystal structure to a monoclinic one, which has an associated volume expansion of ziroconia. This volume expansion effectively pushes back the propagation of the crack and results in higher toughness and strength. [1]
See also
External links
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