Abstract
The behavior of alumina or stabilized zirconia particles in flight in Ar−H2 d. c. plasma jets (up to 40 kW) has been studied. Measurement of the temperature distributions in the plasma jets (by emission spectroscopy) has shown the importance of the electrodes and are chamber designs on the length and diameter of the jets. The important cooling effect of the surrounding air has also been shown, and the parameters controlling it have been studied. Modeling of the momentum, mass, and heat transfers between plasma and particles as well as measurements of the trajectory, velocity, surface temperature distributions, and particle evaporation have enabled us to determine the influence of the different paramters, such as size and injection velocity distributions, particle morphology,etc., on the particle molten state upon impact. These calculations and measurements on the particles in flight have been correlated to some physical properties of deposits.
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