Which industries are zirconia ceramics used in?

In the aspect of structural ceramics, zirconia ceramics are widely used in the field of structural ceramics because of its high toughness, high bending strength, high wear resistance, excellent thermal insulation performance and thermal expansion coefficient close to that of steel. It mainly includes: Y-TZP grinding ball, dispersing and grinding medium, nozzle, ball socket, zirconia mold, micro fan axis, optical fiber pin, optical fiber sleeve, drawing die and cutting tool, cutting tool, clothing button, watch case and strap, bracelet and pendant, ball bearing, light golf bat and other room temperature wear-resistant parts.

In the aspect of functional ceramics, its excellent high temperature resistance is used as induction heating tube, refractory and heating element. Zirconia ceramics have sensitive electrical properties and are mainly used in oxygen sensors, solid oxide fuel cells (SOFC) and high temperature heaters. ZrO2 has a high refractive index (n-21 ^ 22). The coloring elements (V2O5, MoO3, Fe2O3, etc.) added in zirconia powder can be made into colorful translucent polycrystalline ZrO2 materials, which can be made into various decorations with brilliant light like gemstones. In addition, zirconia is widely used in thermal barrier coatings, catalyst carriers, refractories, textiles and other fields.

Zirconia is a professional material, toughening method, mainly using the phase transformation of zirconia to achieve!

Pure zirconia is a white solid, containing impurities will appear gray or light yellow, adding chromogenic agent can also show a variety of other colors. The molecular weight of pure zirconia is 123.22, the theoretical density is 5.89g/cm3, and the melting point is 2715 ℃. It usually contains a small amount of hafnium oxide, which is difficult to separate, but has no obvious effect on the properties of zirconia. Zirconia has three crystal forms: monoclinic, tetragonal and cubic. Zirconia only appears as monoclinic phase at room temperature, and transforms into tetragonal phase when heated to 1100 ℃, and cubic phase when heated to higher temperature. Due to the large volume change during the transformation from monoclinic phase to tetragonal phase, and the large volume change in the opposite direction during cooling, it is easy to cause product cracking, which limits the application of pure zirconia in high temperature field. However, after adding stabilizer, tetragonal phase can be stable at room temperature, so volume mutation will not occur after heating, which greatly expands the application range of zirconia. Yttrium oxide is mainly used as stabilizer in the market.