Study of influence of grinding and centrifugation parameters on the particle size and separation of agglomerates of aluminum oxide

Using ceramic technology can lead to the formation of rigid agglomerates of particles, which hinder uniform sintering and the production of high-density ceramics. This work presents the results of a study on α-Al 2 O 3 powder. The main focus was on the influence of milling and centrifugation parameters on the final particle size when adding NH 4 OH for electrostatic stabilization, which prevents agglomeration. The analysis of the dependence of the centrifugate yield on centrifugation conditions (number of revolutions, content of α-Al 2 O 3 ) allows for the optimization of technological parameters to achieve conditions for the highest yield of particles of a specified size. Particle size was assessed using dynamic light scattering, which also enables the determination of the particle size distribution, necessary for studying material properties. Additionally, the grinding time required to achieve a particle size of 0.4 μm was calculated, and the value of the grinding rate constant was determined. Furthermore, for particles around 0.4 μm in size, the fulfillment of sedimentation-diffusion equilibrium without centrifugation was evaluated. The obtained results can be used to improve methods for producing high-quality α-Al 2 O 3 powder, which is widely used in various industries (in the production of ceramics, electronics, catalysts, etc.).