XMCERA | Zirconia Ceramic Component

▼ Zirconia Ceramic

Zirconia ceramics are white, yellow or gray when containing impurities, and generally contain HfO2, which is not easy to separate. There are three crystal states of pure ZrO2 under atmospheric pressure. The production of zirconia ceramics requires the preparation of high purity, good dispersion performance, ultrafine particles, narrow particle size distribution of powder, zirconia ultrafine powder preparation methods are many, zirconia purification mainly chlorination and thermal decomposition method, alkali metal oxidation decomposition method, lime melting method, plasma arc method, precipitation method, colloidal method, hydrolysis method, spray pyrolysis method.

Zirconia ceramic component is widely used in pump valve components, electronics, and wearables decoration components for its following advantages (see below table).

surface finish Good surface finish fracture toughness High fracture toughness
High mechanical strength wear resistance Excellent wear resistance

zirconia rapid prototyping 1280 400

▼ Toughening Method

Zirconia is a special material, toughening method, mainly using zirconia phase transition to achieve.

Pure zirconia is a white solid that appears gray or yellowish when it contains impurities, and a variety of other colors can be displayed when color developing agents are added. The molecular weight of pure zirconia is 123.22, the theoretical density is 5.89g/cm3, and the melting point is 2715℃. Usually contains small amounts of hafnium oxide, which is difficult to separate, but has no noticeable effect on the properties of zirconia. Zirconia comes in three crystal forms: monoclinic, tetragonal, and cubic. At room temperature, zirconia only appears as a monoclinic phase. When heated to about 1100℃, zirconia becomes a tetragonal phase. When heated to higher temperatures, zirconia becomes a cubic phase. Due to the larger volume change when the monoclinic is converted to the tetragonal phase, the larger volume change will occur in the opposite direction when cooling, which is easy to cause cracking of the product, limiting the application of pure zirconia in the field of high temperature. However, after the addition of stabilizer, the tetragonal phase can be stable at room temperature, so there will be no abrupt change in volume after heating, which greatly expands the application range of zirconia. The main raw material used as stabilizer in the market is yttrium oxide.

▼ Application

In the aspect of structural ceramics, zirconia ceramics are widely used in the field of structural ceramics because of their high toughness, high bending strength and high wear resistance, excellent heat insulation performance, thermal expansion coefficient close to steel and other advantages. Mainly include: Y-TZP grinding ball, dispersion and grinding medium, nozzle, ball valve seat, zirconia mold, micro fan axis, optical fiber pin, optical fiber sleeve, wire drawing die and cutting tools, wear-resistant tools, clothing buttons, watchcase and watchband, bracelet and pendant, ball bearings, golf ball light batting rod and other room temperature wear-resistant zero devices.

In the aspect of functional ceramics, its excellent high temperature resistance performance is used as induction heating tube, refractory material, heating element. Zirconia ceramics have sensitive electrical properties and are mainly used in oxygen sensors, Solid Oxide Fuel cells (SOFC) and high temperature heating bodies. ZrO2 has a high refractive index (N-21^22). By adding certain coloring elements (V2O5, MoO3, Fe2O3, etc.) to ultrafine zirconia powder, ZrO2 can be made into colorful translucent polycrystalline Zro2 material, which can be made into a variety of ornaments with brilliant and colorful light like natural gems. In addition, zirconia in thermal barrier coating, catalyst support, medical, health care, refractory materials, textile and other fields are widely used.

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