Zirconium dioxide (chemical formula: ZrO2) is the main zirconium oxide, usually situation as odourless tasteless white crystals, soluble in water, hydrochloric acid and dilute sulphuric acid. General often contains a small amount of hafnium. Chemical inertness and high melting point, high resistivity, high refractive index and the properties of low thermal expansion coefficient, make it become a important high temperature resistant materials, insulation materials and ceramic sunscreen, also is the main raw material of artificial diamond. The band gap of about 5-7 ev.
Zirconium dioxide properties: white heavy amorphous powder. Odourless. Tasteless. Soluble in 1 2 copy of sulfuric acid and the mixture of water, slightly soluble in hydrochloric acid and nitric acid, slow soluble in hydrofluoric acid, almost insoluble in water. Stimulating. Relative density 5.85. Melting point is 2680 ℃. The boiling point of 4300 ℃. Hardness is inferior to the diamond.
Zirconium dioxide for making metal zirconium and zirconium compounds, and the crucible refractory brick, high-frequency ceramic and grinding materials, ceramic pigment and zirconium salts are mainly used for piezoelectric ceramics, daily-use ceramics, refractory materials and precious metals smelting with brick of zirconium, zirconium tube, crucible, and so on. Also used in the production of steel and non-ferrous metals, optical glass and zirconium dioxide fiber. Also used in ceramic pigments, electrostatic coating and paint. Used in epoxy resin can increase the thermal brine corrosion.
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