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Temperature measurements and adhesion properties of plasma sprayed thermal barrier coatings

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Abstract

Metal-ceramic coatings have been widely used for industrial applications, mainly in the gas turbine and diesel engine industries as thermal barrier coatings (TBCs). Conventional thermal barrier coatings consist of a metallic bond coat and an insulating ceramic topcoat. Temperatures and temperature gradients in the coating during plasma spraying play an important role on the final coating quality, especially the temperature of the particles just hitting the substrate surface. In this work, metal-ceramic coatings were applied on nickel-superalloy substrates. The temperatures of both the coating surface and substrate were measured during spraying. The adhesion of the coatings was determined using ASTM C 633 and correlated with the measured temperatures. Optical pyrometry and thermocouples were used to measure the interfacial and substrate temperatures, respectively. Temperature was shown to have a significant influence where lower interfacial temperatures were found to result in lower adhesion values.

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Authors and Affiliations

  1. UNIMEP, Methodist University of Piracicaba, Technology Center, Rod. Santa Bárbara, Iracemápolis, Km 1 Santa Bárbara d’Oeste, 3450-000, Sao Paulo, Brazil

    C. R. C. Lima

  2. UNICAMP, State University of Campinas, College of Mechanical Engineering, Campinas, Sao Paulo, Brazil

    R. da Exaltacaão Trevisan

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  1. C. R. C. Lima
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  2. R. da Exaltacaão Trevisan
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Lima, C.R.C., da Exaltacaão Trevisan, R. Temperature measurements and adhesion properties of plasma sprayed thermal barrier coatings. J Therm Spray Tech 8, 323–327 (1999). https://doi.org/10.1361/105996399770350548

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  • DOI: https://doi.org/10.1361/105996399770350548

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