Preparation And Characterization Of Nanometer Zirconia Via Shock Wave Plasma Technique

Nanometer polycrystal zirconia powder was synthesized via novel shock wave plasma technique. The effects of gas oxidation temperature on the properties of the as-synthesized powder were studied through DTA / TG analysis and calcination experiment. Respectively, X-ray diffraction,Raman spectrum and Transmission Electron Microscope were used to characterize the precursor and the as-synthesized product. The mechanism of controlling conglomeration during preparation process was also discussed. The results indicate that the agglomeration problem of superfine powder prepared under high temperature was controlled through shortening growth time via shock wave plasma .The calcination temperature has remarkable effect on the crystal phase compose of zirconia powder, while having no obvious effect on the particle size. So the crystal phase compose of zirconia can be controlled through adjusting calcination temperature and the pure nano-sized polycrystal zirconia powder including tetragonal and monoclinic was attained with external diameter of 11.5nm to 16.5nm and perfect dispersity.The main research work and results are as follows.1). Designed source of TNT mixed with zirconium grain way to detonation synthesis of nano-zirconia, a preliminary proof of the shock wave plasma oxide synthesis of nano-technology roadmap and research methods.2). Detonation Synthesis of powder technology to control the growth of time, reached a body temperature of the preparation of ultrafine reunion process control. Preparation of a precursor of a single carbon nano-ZrO₂ particles and the mixed grain powder, spherical particles, particle size about 10 nm in, ZrO₂ as the main tetragonal phase.3). Gas to be effective in removing oxide precursor carbon particles in a single, different calcining temperature on the phase composition of the final product of a greater impact on the size of the impact of smaller particles, 600℃ 800℃conditions, the final powder body size range of 11.5nm 16.55nm, for the tetragonal phase and monoclinic phase of the mixed crystal, by adjusting the calcination temperature, can change the final phase composition of powders.