Low-Power Plasma Torch Method for the Production of Crystalline Spherical CeramicParticles

摘要

A low power, atmospheric pressure, microwave plasma torch was used to makespherical alumina particles of controlled size and size distribution from irregularly shaped precursor powders. Detailed studies of the impact of operating parameters, particularly gas flow rates and applied power, showed that particle size changed in a predictable fashion. The most important factor in controlling particle size appears to be precursor particle density in the aerosol stream that enters the plasma hot zone. This and other facts suggest that article collision rate is responsible for determining ultimate particle size.