Yttria-stabilized zirconia
- Yttria-stabilized zirconia
Yttria-stabilized zirconia (YSZ) is a zirconium-oxide based ceramic, in which the particular crystal structure of zirconium oxide is made stable at room temperature by an addition of yttrium oxide. These oxides are commonly called "zirconia" (ZrO2) and "yttria" (Y2O3), hence the name.
Applications
YSZ has a number of applications:
* For its hardness and chemical inertness (e.g., tooth crowns).
* As a refractory (e.g., in jet engines).
* As an electroceramics due to its ion-conducting properties (e.g., to determine oxygen content in exhaust gases, to measure pH in high-temperature water, in fuel cells).
* Used in the production of a Solid Oxide Fuel Cell (SOFC's)
* For its hardness and optical properties in monocrystal form ("cubic zirconia"), it is used as jewelry.
* As a material for non-metallic knife blades. Boker and Kyocera are two companies that make ceramic knives from YSZ.
Related materials include calcia-, magnesia-, ceria- or alumina-stabilized zirconias, or partially-stablized zirconias (PSZ). Stabilized hafnia is also known.
ee also
Cubic zirconia
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