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

研究成果: Article査読

19 被引用数 (Scopus)

抄録

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.

本文言語English
論文番号11RE01
ジャーナルJapanese journal of applied physics
50
11 PART 2
DOI
出版ステータスPublished - 2011 11月

ASJC Scopus subject areas

  • 工学(全般)
  • 物理学および天文学(全般)

フィンガープリント

「Thermal diffusivity measurement for thermal spray coating attached to substrate using laser flash method」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル