Thermal diffusivity measurement for thermal spray coating attached to substrate using laser flash method

Megumi Akoshima, Takashi Tanaka, Satoshi Endo, Baba Tetsuya Baba, Yoshio Harada, Yoshitaka Kojima, Akira Kawasaki, Fumio Ono

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Ceramic-based thermal barrier coatings are used as heat and wear shields of gas turbine blades. There is a strong need to evaluate the thermal conductivity of coating for thermal design and use. The thermal conductivity of a bulk material is obtained as the product of thermal diffusivity, specific heat capacity, and density above room temperature in many cases. Thermal diffusivity and thermal conductivity are unique for a given material because they are sensitive to the structure of the material. Therefore, it is important to measure them in each sample. However it is difficult to measure the thermal diffusivity and thermal conductivity of coatings because coatings are attached to substrates. In order to evaluate the thermal diffusivity of a coating attached to the substrate, we have examined the laser flash method with the multilayer model on the basis of the response function method. We carried out laser flash measurements in layered samples composed of a CoNiCrAlY bond coating and a 8YSZ top coating by thermal spraying on a Ni-based superalloy substrate. It was found that the procedure using laser flash method with the multilayer model is useful for the thermal diffusivity evaluation of a coating attached to a substrate.

Original languageEnglish
Article number11RE01
JournalJapanese journal of applied physics
Volume50
Issue number11 PART 2
DOIs
Publication statusPublished - 2011 Nov 1

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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    Akoshima, M., Tanaka, T., Endo, S., Tetsuya Baba, B., Harada, Y., Kojima, Y., Kawasaki, A., & Ono, F. (2011). Thermal diffusivity measurement for thermal spray coating attached to substrate using laser flash method. Japanese journal of applied physics, 50(11 PART 2), [11RE01]. https://doi.org/10.1143/JJAP.50.11RE01