Nano Zirconia Deflagration Preparation And Optical Performance Research

Based on combustion synthesis and explosion method, a 'micro-cells phaseinversion'design was done on the process of preparing nano-zirconia powder, and a lowcost and rapid technology was developed. All the affecting factors were investigated andthe property of the powder was characterized by XRD, TEM, SEM, IR. and the preparingmechanism was discussed in terms of differential thermal analysis (DTA), and a physicalmodel of powder preparing by deflagration method was established, and fluorescencespectrum was used to further investigate the optical performances of nano-zirconia withdifferent crystal phases.The main research work and results are as follows:(1) in the process of preparing nano-zirconia, The deflagration of composite ammoniumsalts offered the energy. In the heating process, the effective inhibition effect betweencrystallites was realized by the expansion effect of gas released by decomposition ofcomposite salts during different temperature period. The crystal phase of products can becontrolled by regulating the composite salts proportion.(2)The optimum process in gel-deflagration is: the proportion of ammonium perchlorate,urea, ammonium nitrate and zirconyl chloride is 2:4:4:1 and calcinate at 800℃,, theproduct is tetragonal phase and its particle size is about 20nm; when the proportionincreased to 4:6:6:1, the product is monoclinic phase and about 50nm in particle size.(3) The solution-deflagration is a Simplification of multi-procedures, such as traditionalpreparation, aging, drying and calcinating processes. The optimun conditions to preparehigh performance tetragonal phase zirconia is: the proportion of zirconyl chloride,ammonium nitrate and ammonium perchlorate is 1:4:1 and calcinate at 800℃, theparticle size of products is about 20nm, and the best surface area is 48.763m~2/g; Theoptimun conditions to prepare high performance monoclinic phase zirconia is: theproportion of ammonium perchlorate, urea, ammonium nitrate and zirconyl chloride is1:4:2:1 and calcinate at 800℃, the crystal size of products is about 50.69nm and the bestsurface area is 45.921 m~2/g(4) Different calcinating temperature decided the reaction rate of deflagration ofcomposite salts, when the proportion was fixed, the higher the temperature was, thehigher the energy released and was provided to micro-cells phase inversion.(5) According to the analysis of fluorescence properties, the fluorescence properties ofproduct connected to crystal. The monoclinic phase has luminescence when the tetragonal phase has no fluorescence which was different from published literature.