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Experimental Research of Al2O3 Micro-Particles Production by Supercritical Hydrolysis

Because of the excellent specialties of intensity, rigidity, heat-durability, corrosion proof and wide uses in many fields, Al2O3 has a promising future. Supercritical hydrolysis is a new method to produce Al2O3 micro-particles whose average diameter is 537nm. The resulting samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and Particle-size Analyzer. Its product is the high purity α-Al2O3 which is characterized by the features of the small particle size, the well developed dispersion, and the fine concentricity. The influences of process parameters, including pressure, temperature，total flux and ratio of branch flux, on particle size were investigated at the same time. The results indicated that the particle size has a significant increasing trend with an increase in the pressure and temperature; however, it decreased with an increase in the total flux, while it decreased slightly with an increase in the ratio of branch flux.