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zirconium oxide powder is a white crystalline substance which has excellent mechanical properties and stability at high temperatures. It is an ideal material for ceramics and refractory products, ceramic colors and pigments. It is also used as a substitute for alumina in hip and femoral ball joints to provide superior strength, wear resistance and stability. It is also widely used as a refractory for furnaces, kilns and ovens.
Zirconia has an exceptionally high specific surface area and is a good choice as a replacement for Portland cement in concrete. This is achieved by precipitating zirconium oxide in the presence of a superplasticizer (glenium 51). This allows the formation of tetragonal zirconia polycrystals (TZP) which have an extremely high transformation toughness.
Fine zirconium oxide powder can be produced by hydrolyzing under heating an aqueous solution containing a water-soluble zirconium salt such as zirconium nitrate, zirconium sulfate and zirconium oxychloride with an aqueous ammonia to form a zirconia hydroxide sol, filtering the sol and washing it with water to obtain a precipitate; then dehydrating the sol and drying it to produce a zirconia powder. Optionally, a stabilizer may be added to the zirconia in the form of an oxide, hydroxide or salt selected from calcium, magnesium, yttrium or a lanthanide series element such as cerium.
This method of producing fine zirconium oxide powder makes it less coagulative and easily disintegratable, so that it can be sinterized to produce a sinter product with a density greater than 98 % of its theoretical density. It can be made into a sinter with a good structure and a high strength and is well suited for use in various applications where it is necessary to control the particle size, shape, agglomeration and surface area.
