Il biossido di zirconio, con formula chimica ZrO2, è un cristallo bianco, inodore e insapore, insolubile in acqua, acido cloridrico e acido solforico diluito. È chimicamente inattivo e ha un alto punto di fusione, un'alta resistività, un alto indice di rifrazione e un basso coefficiente di espansione termica, che lo rendono un importante materiale resistente alle alte temperature, un materiale isolante ceramico e un agente di protezione solare ceramico, nonché la principale materia prima per le punte artificiali.
Uses of zirconia
1.Raw materials for metallic zirconium and its compounds
Used for making metallic zirconium and zirconium compounds, making refractory bricks and crucibles, high-frequency ceramics, abrasive materials, ceramic pigments and zirconates, etc. Mainly used for piezoelectric ceramic products, daily ceramics, refractory materials and precious metal smelting. Zirconium bricks, zirconium tubes, crucibles, etc. Also used in the production of steel and non-ferrous metals, optical glass and zirconium dioxide fibers. Also used in ceramic pigments, electrostatic coatings and baking varnishes. Used in epoxy resins to increase resistance to corrosion by hot salt water.
2.Refractory materials
Zirconia fiber is a polycrystalline refractory fiber material. Due to the high melting point, non-oxidation and other high-temperature properties of the ZrO2 material itself, ZrO2 fiber has a higher service temperature than other refractory fiber varieties such as alumina fiber, mullite fiber, aluminum silicate fiber and so on.
3.Gas turbine
The application of plasma sprayed zirconium dioxide thermal barrier coatings on aviation and industrial gas turbines has made great progress, and has been used in the turbine part of gas turbines to a certain extent. Since this coating can reduce the temperature of air-cooled high-temperature components by 50~200°C, it can significantly improve the durability of high-temperature components, or allow the gas temperature to be increased or the amount of cooling gas required to be reduced while maintaining the temperature of the high-temperature components. changes, thus improving the efficiency of the engine.
4. Ceramic materials
Because of its large refractive index, high melting point and strong corrosion resistance, zirconia is used as a raw material in the kiln industry. Piezoelectric ceramic products include filters, speakers, ultrasonic underwater sound detectors, etc. There are also daily ceramics (industrial ceramic glazes), zirconium bricks and zirconium tubes for precious metal smelting, etc. Nanoscale zirconia can also be used as a matrix material for polishing agents, abrasive grains, piezoelectric ceramics, precision ceramics, ceramic glazes and high-temperature pigments.
5.Others
In addition, zirconia can be used in the manufacture of incandescent gas lampshades, enamel, white glass, refractory crucibles, etc. X-ray photography. Abrasive materials. Together with yttrium, it is used to manufacture light source lamps in infrared spectrometers, thick film circuit capacitor materials, and piezoelectric crystal transducer formulas.
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