&lt;title&gt;Using IR thermography as a quality control tool for thermal spraying in the aircraft industry&lt;/title&gt;

Jokinen, Petri; Kauppinen, Timo; Varis, Tommi; Korpiola, Kari

doi:10.1117/12.381565

Cited by 2 publications

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“…These factors reduce the real-time and on-line performance of the monitoring system using thermal cameras. However, IR thermal camera has proven to be an acceptable approach for monitoring temperature while spraying small and thin products made of aluminum, plastics, and composites used in the aerospace industry ( Ref 17,19). It is also helpful for the process diagnosis of the temperature field in special operating conditions ( Ref 24).…”

Section: Introductionmentioning

confidence: 98%

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

et al. 2008

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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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Section: Introductionmentioning

confidence: 98%

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

et al. 2008

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Condition Monitoring of a Three-Cathode Cascaded Plasma Spray Torch Regarding Process Reliability

et al. 2022

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The TriplexPro™-210 plasma spray torch (Oerlikon Metco) is a three-cathode plasma generator. It became a kind of workhorse for the wide range of tasks handled at the Jülich Thermal Spray Center (JTSC). Compared to conventional single-cathode torches, the cascaded design of the nozzle suggests low fluctuations of the arc and thus high stability. However, after a certain time, degradation sets in even with such a torch, impairing the reliability of the process. It is therefore important to detect indications of performance loss in time and not only during the inspection of the deposited layer. In this study, standard samples of YSZ thermal barrier coatings were sprayed regularly over a period of two years. Operational data and feedstock characteristics were collected and correlated with the area-specific mass deposition. It turned out that the measured substrate surface temperature showed a distinct correlation. Searching for the reasons for the temperature variations, several process parameters could be ruled out as they are monitored by calibrated sensors, controlled, and their time course is recorded by the control unit. Moreover, there are other parameters, which can have a considerable impact such as the robot alignment or the substrate cooling conditions. However, the purposeful experimental variation of such variables resulted in a variability of the mass deposition being considerably smaller than observed over the two years. Thus, it can be concluded that torch degradation had a pronounced effect, too. The substrate surface temperature can be used as indicator for the torch status and the reliability of the spray process.

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<title>Using IR thermography as a quality control tool for thermal spraying in the aircraft industry</title>

Cited by 2 publications

References 0 publications

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

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

Condition Monitoring of a Three-Cathode Cascaded Plasma Spray Torch Regarding Process Reliability

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