Temperature Measurement Challenges and Limitations for In-Flight Particles in Suspension Plasma Spraying
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REVIEW
Temperature Measurement Challenges and Limitations for In-Flight Particles in Suspension Plasma Spraying Bishoy Aziz1 • Patrick Gougeon2 • Christian Moreau1
Submitted: 18 November 2016 / in revised form: 17 January 2017 Ó ASM International 2017
Abstract Suspension plasma spraying (SPS) acquires a significant interest from the industry. The deposited coatings using this technique were proved to have unique microstructural features compared to those built by conventional plasma spraying techniques. In order to optimize this process, in-flight particle diagnostics is considered a very useful tool that helps to control various spraying parameters and permits better coating reproducibility. In that context, the temperature of in-flight particles is one of the most important key elements that helps to optimize and control the SPS process. However, the limitations and challenges associated with this process have a significant effect on the accuracy of two-color pyrometric techniques used to measure the in-flight particle temperature. In this work, the influence of several nonthermal radiation sources on the particle temperature measurement is studied. The plasma radiation scattered by in-flight particles was found to have no significant influence on temperature measurement. Moreover, the detection of the two-color signals at two different locations was found to induce a significant error on temperature measurement. Finally, the plasma radiation surrounding the in-flight particles was identified This article was presented at the 2015 International Thermal Spray Conference, held May 11-14, 2015, in Long Beach, California, USA, and has been expanded from the original presentation. & Bishoy Aziz [email protected] Christian Moreau [email protected] 1
Department of Mechanical and Industrial Engineering, Concordia University, Montreal, Canada
2
Conseil national de recherches Canada, Saguenay, QC, Canada
as the main source of error on the temperature measurement of in-flight particles. Keywords optical measurement particle plasma interaction plasma diagnostics protective coatings suspension spraying thermal barrier coatings (TBCs) yttria-stabilized zirconia (YSZ)
Introduction Suspension plasma spraying (SPS) is a trending coating technique that permits the deposition of nanostructured coatings with unique characteristics. The coatings developed by SPS acquire unique microstructure’s features compared to the conventional air plasma spray methods. Therefore, enormous interest from the industry nowadays is given to develop and optimize SPS process. The applications that can benefit from this new process are broad and mainly in the field of energy, aerospace, biomedical and defense (Ref 1-5). In SPS, the fine grains of sprayed material are introduced into the plasma jet suspended in a liquid (water, ethanol or a mix) because of their small size distribution. The suspension is usually injected radially relative to the plasma jet axis. The plasma jet atomizes the suspension in fine droplets
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