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Effect of anode inner contour on atmospheric pressure DC plasma spraying process

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Document pages: 12 pages

Abstract: In the process of thermal plasma spraying, anode nozzle is one of the important parts of plasma torch. Its internal contour controls the characteristics of plasma arc jet, determines the motion and heating behavior of particles in flight, and thus affects the coating quality. In this study, the effects of anode inner contour, standard cylindrical nozzle and conical divergent outlet conical Laval nozzle (CSL nozzle) on arc voltage, net power, thermal efficiency, plasma jet characteristics and particle behavior in flight were studied. The performance of the coating under atmospheric pressure plasma spraying was systematically studied. The results show that the cylindrical nozzle has higher arc voltage, net power, thermal efficiency and higher plasma tempering temperatureture and velocity at the torch exit, while the CSL nozzle has a higher measured temperature of plasma jet. The variation trends of the plasma jet characteristics for the two nozzles are comparable under various spraying parameters. The in-flight particle with smaller velocity of CSL nozzle has a higher measured temperature and melting fraction. As a result, the coating density and adhesive strength of CSL nozzle are lower than those of cylindrical nozzle, but the deposition efficiency is greatly improved.

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