Yttriastabilizált

Yttriastabilizált refers to a material that has been stabilized by the addition of yttria (yttrium oxide, Y₂O₃). This stabilization is commonly employed in various ceramic materials, most notably in zirconia (zirconium dioxide, ZrO₂). Pure zirconia undergoes a phase transformation when heated and cooled, leading to significant volume changes and cracking. The addition of yttria disrupts this natural transformation, forming a metastable tetragonal phase at room temperature, which is much more resistant to cracking. This yttriastabilized zirconia, often abbreviated as YSZ, exhibits enhanced mechanical properties such as high strength, toughness, and fracture resistance.

YSZ finds widespread applications in demanding environments. It is extensively used in dental restorations due to its biocompatibility, aesthetics, and durability. In engineering, it serves as a component in thermal barrier coatings for gas turbine engines, protecting metal parts from high temperatures. It is also utilized in oxygen sensors for combustion control in vehicles and industrial processes, leveraging its ionic conductivity at elevated temperatures. Furthermore, YSZ can be found in certain types of cutting tools and advanced ceramics requiring superior wear resistance and thermal stability. The specific properties of YSZ can be tailored by adjusting the yttria content and the processing methods.