Yttria blends of approximately 3% are called either tetragonal polycrystalline zirconia or tetragonal
zirconia polycrystal (forming the
initialism
An acronym is a word or name formed from the initial components of a longer name or phrase. Acronyms are usually formed from the initial letters of words, as in ''NATO'' (''North Atlantic Treaty Organization''), but sometimes use syllables, as ...
s TZP or TPZ) and have the finest grain size. These grades exhibit the highest toughness at room temperature, because they are nearly 100% tetragonal, but this degrades severely between 200 and 500 °C as these irreversible crystal transformations also cause dimensional change.
See also
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Zirconium dioxide
Zirconium dioxide (), sometimes known as zirconia (not to be confused with zircon), is a white crystalline oxide of zirconium. Its most naturally occurring form, with a monoclinic crystalline structure, is the mineral baddeleyite. A dopant s ...
References
{{DEFAULTSORT:Tetragonal Polycrystalline Zirconia
Yttrium compounds
Zirconium compounds
Ceramic materials