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Sensor Issues and Requirements for Developing Real-Time Control for Plasma Spray Deposition

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Abstract

This paper discusses the requirements of sensors that could be used both for advanced real-time control as well as manual torch operator control of plasma spray processes, and reviews the critical issues associated with design and implementation of such sensors. The focus is on yttria-stabilized zirconia for thermal barrier coatings. The overarching requirement is that the sensor must capture the subset of particles that contributes most to coating properties and that the resulting measurements of these critical subdistributions must be aggregated in a manner that correlates best to the coating buildup. For deposition rate control, the focus of this work, experiments show that the mass flux of molten particles correlates better with coating thickness than bulk-average temperature or light intensity. However, measurement of molten mass flux for control requires sensors that are capable of sensing particle states at high rates from across a large portion of the full plume.

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Acknowledgments

This material is based in part upon work supported by the National Science Foundation under Grant Numbers DMI-0300484, OII-0539622, and IIP-0724382. The authors gratefully acknowledge the contributions from undergraduate students who aided in conducting experiments and analyzing the results including Sean DeLeo, Annie Lum, Steve Maouyo, and Kristina Hogstrom.

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Authors and Affiliations

  1. Mechanical Engineering Department, Boston University, Boston, MA, USA

    D. Wroblewski, M. Cannamela, S. N. Basu & M. Gevelber

  2. Cyber Materials LLC, Boston, MA, USA

    G. Reimann, M. Tuttle & D. Radgowski

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  1. D. Wroblewski
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  2. G. Reimann
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  3. M. Tuttle
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  4. D. Radgowski
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  5. M. Cannamela
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  6. S. N. Basu
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  7. M. Gevelber
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Correspondence to D. Wroblewski.

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Wroblewski, D., Reimann, G., Tuttle, M. et al. Sensor Issues and Requirements for Developing Real-Time Control for Plasma Spray Deposition. J Therm Spray Tech 19, 723–735 (2010). https://doi.org/10.1007/s11666-010-9490-3

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  • DOI: https://doi.org/10.1007/s11666-010-9490-3

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