Hall, Aaron Christopher McCloskey, James Francis Horner, Allison LynneĪ design of experiments approach was used to describe process parameter— spray pattern relationships in the Twin Wire Arc process using zinc feed stock in a TAFA 8835 (Praxair, Concord, NH, USA) spray torch. The effect of process parameters on Twin Wire Arc spray pattern shape Pulsed plasma jet spraying provides the means to coat the insides of pipes, tubes, and engine block cylinders with very high velocity droplet impact. 50 micron aluminum droplets with velocities of 1500 m/s are produced. Pulsed power provides higher coating particle velocities leading to improved coatings.
The effectiveness of wire-arc spraying is improved by replacing the usual atomizing air stream with a rapidly pulsed high velocity plasma jet. The quality of coatings produced is improved by increasing the velocity with which coating particles impact the coated surface. Wire arc spraying using repetitively pulsed, high temperature gas jets, usually referred to as plasma jets, and generated by capillary discharges, substantially increases the velocity of atomized and entrained molten droplets.
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