Abstract
Particle size of alumina in Ni-Al2O3 composites deposited on cylindrical rotating cathodes was investigated for two different cathode diameters (1cm and 3cm). The composites formed at different rotation speeds were dissolved in hot concentrated nitric acid. Insoluble alumina residua were washed, settled, and redispersed. The particle size distribution of the residua was determined by means of centrifugal sedimentation. It was found that the characteristic particle size for both cathodes is inversely proportional to the rotation speed of the cathode. The volume percentage of alumina in the composites decreases with increasing rotation speed, but, remains constant at rotation speeds higher than 1000rpm for the 3cm diameter cathode. This result stands beyond the estimation based on the theory of the detaining function, but may be attributed to an influence of the solution movement on the particle size distribution in the vicinity of the cathode surface.
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