Views: 0 Author: Site Editor Publish Time: 2022-04-29 Origin: Site
Zirconium dioxide, with the chemical formula ZrO2, is the main oxide of zirconium. It is usually a white, odorless and tasteless crystal, and is insoluble in water, hydrochloric acid and dilute sulfuric acid. It is chemically inactive, and has the properties of high melting point, high resistivity, high refractive index and low thermal expansion coefficient, making it an important high temperature resistant material, ceramic insulating material and ceramic sunscreen, as well as the main raw material for artificial drills.
Raw materials of metal zirconium and its compounds
Used for making metal zirconium and zirconium compounds, making refractory bricks and crucibles, high-frequency ceramics, abrasive materials, ceramic pigments and zirconate, etc. Mainly used for piezoelectric ceramic products, household 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. It can be used in epoxy resin to increase the corrosion of heat-resistant salt water.
Zirconia fiber is a polycrystalline refractory fiber material. Due to the high melting point, non-oxidation and other excellent properties of ZrO2 material at high temperature, ZrO2 fiber has a higher service temperature than other refractory fibers such as alumina fiber, mullite fiber, and aluminum silicate fiber. Zirconia fiber can be used for a long time in an ultra-high temperature oxidizing atmosphere above 1500 ℃, and the maximum operating temperature is as high as 2200 ℃, and it can still maintain a complete fiber shape even up to 2500 ℃. Non-volatile and non-polluting, it is currently the top refractory fiber material in the world. The acid and alkali corrosion resistance of ZrO2 is much stronger than that of SiO2 and Al2O3. Insoluble in water, soluble in sulfuric acid and hydrofluoric acid; slightly soluble in hydrochloric acid and nitric acid. It can be fused with alkali to form zirconate.
The application of plasma sprayed zirconia thermal barrier coating 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 to increase the gas temperature or reduce the amount of cooling gas required to keep the temperature to which the high-temperature components are subjected. changes, thereby increasing the efficiency of the engine.
Because of its high refractive index, high melting point and strong corrosion resistance, zirconia is used as raw material for kiln industry. Piezoelectric ceramic products include filters, speakers, ultrasonic underwater acoustic detectors, etc. There are also daily-use ceramics (industrial ceramic glazes), zirconium bricks and zirconium tubes for precious metal smelting. Nano-scale zirconia can also be used as a matrix material for polishing agents, abrasive particles, piezoelectric ceramics, precision ceramics, ceramic glazes and high-temperature pigments.
In addition, zirconia can be used in the manufacture of incandescent gas lampshades, enamels, white glass, refractory crucibles, etc. X-ray photography. Abrasive material. Together with yttrium, it is used to manufacture light source lamps in infrared spectrometers, thick-film circuit capacitor materials, and piezoelectric crystal transducer formulations.