An Integrated Investigation Approach for Coating Temperature Measurement and Control During Plasma Spraying

Abstract

An integrated investigation approach for temperature measurement and control of plasma sprayed coating is presented in this paper. It is based on infrared (IR) pyrometry combined with specific robot scanning trajectories. The temperature evolution was continuously detected and recorded during preheating, spraying, and cooling stages. Then the two specific factors, periodic average temperature and periodic standard deviation, were adopted to evaluate the temperature variation and the fluctuation of the thermal cycle relevant to one spraying period. These two factors were successful in describing the temperature variation during experimental processing sets. Moreover, the influence of processing parameters of Z-type robot spray trajectory, including spray distance, scanning velocity, and scanning step on coating temperature is experimentally researched and explained reasonably by comparing the two factors.

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