2.45 GHz microwave plasma system for high-velocity thermalspraying
P. Mavromatidisa, A. Shawa, A.I. Al-Shamma, J. Lucasa, W. Lucas
Journal of Materials Processing Technology
Abstract
This research program investigates the use of microwave plasma, at 2.45 GHz frequency, to preheat nitrogen gas/coating powders when using a high-velocity spray technique. The heating process of this novel technique is obtained by the combination of dielectric and microwave plasma heating by using a long interaction cavity. As a result the thermal efficiency of the process will be as high as 50% compared with the present commercial plasma heated device which is in the order of 5% enabling temperatures of 1000 °C to be obtained. This paper presents the novel design and construction of a cost-effective microwave plasma system for thermalspraying. In addition, the preliminary result of an optical fibre temperature sensor operating in harsh microwave environment will be described.
keywords:Microwave plasma; Cavity resonator; Thermalspraying; Material coating
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