Method for toughening zirconia ceramics

Zirconium oxide is a special material. The method of toughening zirconia, as you mentioned, can also be achieved mainly by the phase transformation of zirconia! There is a product about the development of zirconia, and the products made are mainly used. In zirconia ceramics and refractory products.

Pure zirconia is a white solid that appears gray or yellowish when it contains impurities, and can be displayed in a variety of other colors by adding a developer. Pure zirconia has a molecular weight of 123.22, a theoretical density of 5.89 g/cm3, and a melting point of 2715 °C. It usually contains a small amount of cerium oxide, which is difficult to separate, but has no significant effect on the properties of zirconia. Zirconia has three crystal forms: monoclinic, tetragonal, and cubic.

At room temperature, zirconia appears only in a monoclinic phase, and is heated to about 1,100 ° C to transform into a tetragonal phase, which is converted to a cubic phase when heated to a higher temperature. Due to the large volume change during the transition of the monoclinic phase to the tetragonal phase, a large volume change occurs in the opposite direction during cooling, which easily causes cracking of the product and limits the application of pure zirconia in the high temperature field. . However, after the addition of the stabilizer, the tetragonal phase can be stabilized at normal temperature, so that no volume change occurs after heating, which greatly expands the application range of zirconia.