Zirconium dioxide, ZrO2, is usually a white, odorless and tasteless crystal, which is insoluble in water, hydrochloric acid and dilute sulfuric acid. It is chemically inactive and has high melting point, high resistivity, high refractive index and low thermal expansion coefficient, making it an important high-temperature resistant material, ceramic insulation material and ceramic sunscreen agent, and also the main raw material for artificial drills.