Product performance of zirconia ZrO2 powder

Overview of Zirconia ZrO2 Powder

Zirconium dioxide (ZrO2), sometimes called zirconia (not to be confused with zircon), is the white crystalline oxide of zirconium. Its most naturally occurring form has a monoclinic crystal structure and is mineral bentonite. Dopant-stabilized cubic zirconia, cubic zirconia, synthesized in various colors, used as gem and diamond simulants.

Zirconia is not chemically reactive. Slowly corroded by concentrated hydrofluoric acid and sulfuric acid. When heated with carbon, it converts to zirconium carbide. When heated with carbon in chlorine, it is converted to zirconium tetrachloride.

Zirconia is one of the most studied ceramic materials. ZrO2 adopts a monoclinic crystal structure at room temperature and transforms into tetragonal and cubic crystals at higher temperatures. The volume change caused by the structure from tetragonal to monoclinic to cubic transformation will cause greater stress, which will cause it to crack when cooled from high temperature.

Three phases are known: monoclinic phase below 1170°C; tetragonal phase between 1170°C and 2370°C; cubic phase above 2370°C. Normally, the trend is to have higher symmetry at higher temperatures. A small portion of calcium or yttrium oxides are stabilized in the cubic phase. The rare mineral Tazheranite (Zr, Ti, Ca) O2 is cubic. Unlike TiO2, which has six-coordinated titanium in all phases, monoclinic zirconia is composed of seven-coordinated zirconium centers. This difference is due to the larger size of zirconium atoms relative to titanium atoms.

The bandgap of ZrO2 depends on the phase (cubic, tetragonal, monoclinic, or amorphous) and preparation method, with a typical estimated value of 5-7 eV. A special case of zirconia is tetragonal zirconia polycrystalline or TZP, which means polycrystalline zirconia composed of only a metastable tetragonal phase.

The properties of zirconia ZrO2 powder:

The chemical properties of zirconium dioxide are inert, with a high melting point, high resistivity, high refractive index, and low coefficient of thermal expansion, making it an important high-temperature resistant material, ceramic insulating material, and ceramic sunscreen, and it is also the main source of artificial diamonds. section. raw material. The bandgap is about 5-7eV.

How is zirconia ZrO2 powder produced?

The industrial refractory material is stabilized zirconia, and most electric powders are made. Add carbon and stabilized calcium oxide to the zircon meter fuse, and use zirconia and calcium oxide to form a solid solution, and then stably form zirconia, while using zirconia and calcium oxide to form a solid solution. The stable and partially stabilized zirconia used in fine ceramics is usually prepared by wet methods.

The most mature and most commonly used is neutralization. Dissolve the purified zirconium chloride in pure water, filter the insoluble matter, adjust the zirconium concentration in the solution, then add the required amount of cerium chloride solution (or other rare earth metal or alkaline chloride solutions), and add ammonia. precipitation. The precipitate is washed with hot water, then filtered, dried, and calcined. Ultrafine and stable zirconia powder can be obtained by processing the calcined product.

Partially stabilized zirconia is used to control the amount of stabilizer added, which is not sufficient to achieve complete stability. Partially stabilized zirconia has high strength and thermal shock resistance and has relatively wide applications in structural ceramics.

The application of zirconia ZrO2 powder

Used in metal zirconium and zirconium compounds, refractory bricks and crucibles, high-frequency ceramics, abrasives, ceramic pigments, and zirconates, mainly used in piezoelectric ceramic products, daily ceramics, refractory materials, and precious metal smelting zirconium bricks, zirconium Tubes, crucibles, etc.

Raw materials for metal zirconium and its compounds

Used in the production of metal zirconium and zirconium compounds, refractory bricks and crucibles, high-frequency ceramics, abrasive materials, ceramic pigments, and zirconates, etc. Mainly used in piezoelectric ceramic products, daily ceramics, refractory materials, and precious metal smelting Zirconium bricks, zirconium tubes, crucibles, etc. It is also used in the production of steel and non-ferrous metals, optical glass, and zirconium dioxide fiber. It is also used in ceramic pigments, electrostatic coatings, and baking varnishes. Used in epoxy resin to increase the corrosion of heat-resistant saltwater.

Refractory

Zirconia fiber is a polycrystalline refractory fiber material. Due to the high melting point, non-oxidation, and other excellent characteristics of ZrO2 material itself, ZrO2 fiber has a higher service temperature than other refractory fibers such as alumina fiber, mullite fiber, and aluminum silicate fiber. The zirconia fiber is used for a long time in an ultra-high temperature oxidation atmosphere above 1500 ℃, and the maximum use temperature is as high as 2200 ℃. It can maintain a complete fiber shape even up to 2500 ℃, and has stable high-temperature chemical properties, corrosion resistance, oxidation resistance, and thermal shock resistance. It is non-volatile and pollution-free, and it is currently the world's top refractory fiber material. 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 form zirconate by eutectic with alkali.

gas turbine

The application of plasma-sprayed zirconia thermal barrier coatings in aviation and industrial gas turbines has made great progress and has been used in the turbine part of gas turbines to a certain extent. Because this coating can reduce the temperature of air-cooled high-temperature components by 50 to 200 ℃, 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 maintain the temperature of the high-temperature components. Change, thereby improving the efficiency of the engine.

Ceramic material

Because of its high refractive index, high melting point, and strong corrosion resistance, zirconia is used as raw material for the kiln industry. Piezoelectric ceramic products include filters, speakers, ultrasonic and hydro-acoustic detectors, etc. There are also daily ceramics (industrial ceramic glaze), zirconium bricks, and zirconium tubes for smelting precious metals. Nano-sized zirconia can also be used as a matrix material for polishing agents, abrasive grains, piezoelectric ceramics, precision ceramics, ceramic glazes, and high-temperature pigments.

other

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.

The price of zirconia ZrO2 powder

The price of zirconia ZrO2 powder will vary randomly with the production cost, transportation cost, international situation, exchange rate, and market supply and demand of zirconia ZrO2 powder. Tanki New Materials Co.,Ltd aims to help all industries and chemical wholesalers find high-quality, low-cost nanomaterials and chemicals by providing a full set of customized services. If you are looking for zirconia ZrO2 powder, please feel free to send it to get the latest zirconia ZrO2 powder price.

Suppliers of Zirconia ZrO2 powder

As a global supplier of zirconia ZrO2 powder, Tanki New Materials Co.,Ltd. has extensive experience in the performance, application, and cost-effective manufacturing of advanced technology and engineering materials. The company has successfully developed a series of powder materials (including oxides, carbides, nitrides, single metals, etc.), high-purity targets, functional ceramics, and structural devices, and provides OEM services.