Temperature Estimation and Prediction of Aluminum-Content by Means of Microstructural Change in Gas Turbine Coatings

2005 ◽  
Vol 54 (3) ◽  
pp. 257-264 ◽  
Author(s):  
Mitsutoshi OKADA ◽  
Yoshiyuki ETORI ◽  
Tohru HISAMATSU ◽  
Takeshi TAKAHASHI
Keyword(s):  
Gas Turbine ◽  
Aluminum Content ◽  
Microstructural Change ◽  
Temperature Estimation ◽  
Estimation And Prediction ◽  
Gas Turbine Coatings

Derivation of Temperature-Estimation Equation Based on Microstructural Changes in Coatings of In-Service Blades of Gas Turbines

2010 ◽  
Author(s):  
Mitsutoshi Okada ◽  
Tohru Hisamatsu ◽  
Terutaka Fujioka
Keyword(s):  
High Temperature ◽  
Diffusion Layer ◽  
Gas Turbines ◽  
Aluminum Content ◽  
Oxide Formation ◽  
Diffusion Layer Thickness ◽  
Temperature Estimation ◽  
Diffusion Layers ◽  
Barrier Coating ◽  
Trailing Edges

A CoNiCrAlY-coated blade of an in-service gas turbine is analyzed, and a diffusion layer is formed along the boundary between the coating and the substrate due to the interdiffusion in the middle and tip of the blade. Such a layer is not observed in the vicinity of the blade root because of a comparatively low temperature during the operation. Coated specimens are prepared from the portions of the blade devoid of the diffusion layers, and the specimens are exposed to a high temperature in air. On the basis of the increase in the diffusion layer thickness, an equation for estimating the temperature of the blade is derived. Analysis of another in-service blade with a thermal barrier coating (TBC) is carried out. The aluminum-content decreases below the bond coat surface due to Al diffusion caused by the Al-oxide formation. This results in the formation of an Al-decreased layer (ADL) along the leading and trailing edges. The ADL is not observed at the center of the blade chord. The specimens are extracted from the portions of the blade that are devoid of ADL, and they are subjected to a high temperature in air. On the basis of the increase in the ADL thickness, a temperature-estimation equation is derived.

scholarly journals Service Temperature Estimation for Gas Turbine Buckets Based on Microstructure Change.

1996 ◽  
Vol 45 (6) ◽  
pp. 699-704 ◽  
Author(s):  
Yomei YOSHIOKA ◽  
Nagatoshi OKABE ◽  
Daizo SAITO ◽  
Kazunari FUJIYAMA ◽  
Takanari OKAMURA
Keyword(s):  
Gas Turbine ◽  
Service Temperature ◽  
Temperature Estimation ◽  
Microstructure Change

Derivation of Temperature-Estimation Equation Based on Microstructural Changes in Coatings of In-Service Blades of Gas Turbines

2010 ◽  
Vol 133 (2) ◽  
Author(s):  
Mitsutoshi Okada ◽  
Tohru Hisamatsu ◽  
Terutaka Fujioka
Keyword(s):  
High Temperature ◽  
Diffusion Layer ◽  
Gas Turbines ◽  
Aluminum Content ◽  
Oxide Formation ◽  
Diffusion Layer Thickness ◽  
Temperature Estimation ◽  
Diffusion Layers ◽  
Barrier Coating ◽  
Trailing Edges

A CoNiCrAlY-coated blade of an in-service gas turbine is analyzed, and a diffusion layer is formed along the boundary between the coating and the substrate due to the interdiffusion in the middle and tip of the blade. Such a layer is not observed in the vicinity of the blade root because of a comparatively low temperature during the operation. Coated specimens are prepared from the portions of the blade devoid of the diffusion layers, and the specimens are exposed to a high temperature in air. On the basis of the increase in the diffusion layer thickness, an equation for estimating the temperature of the blade is derived. An analysis of another in-service blade with a thermal barrier coating is carried out. The aluminum content decreases below the bond coat surface due to Al diffusion caused by the Al-oxide formation. This results in the formation of an Al-decreased layer (ADL) along the leading and trailing edges. The ADL is not observed at the center of the blade chord. The specimens are extracted from the portions of the blade that are devoid of ADL, and they are subjected to a high temperature in air. On the basis of the increase in the ADL thickness, a temperature-estimation equation is derived.

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