B208 高速フレーム溶射によって施工された遮熱コーティングボンドコートの組織変化を用いた温度推定手法についての検討(検査・モニタリング-2,OS6 保全・設備診断技術)

概要

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CoNiCrAlY bond coats in thermal barrier coatings (TBCs) are prepared by high velocity oxygen fuel (HVOF) spraying and low pressure plasma spraying (LPPS) in order to clarify the influence of the deposition process on the temperature estimation using the microstructural change, and TBC specimens are exposed to high temperature atmosphere. HVOF bond coat contains larger amount of oxides and pores than LPPS one. In both of the bond coats, the layer with decreased Al-content is formed in the vicinity of their surface due to the oxidation during the test, and the layer thickness increases in proportion to the squared root of the test time. The relation clarifies that the temperature estimation can be applied to HVOF bond coat as well as to LPPSone. The oxides and pores in HVOF bond coat has the possibility to decrease the growth rate of the thickness.
2009-06-28