Experimental Investigation to the Displacement Instability of TGO Near Surface Groove in TBCs due to Thermo-Mechanical Cycles

Abstract:

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The present paper reports the experimental results for the displacement instabilities occurring near the surface grooves of substrate of Fecralloy material in thermal barrier coatings (TBCs). Two groups of groove with different orientations were carved on the surfaces of specimens. The specimen were then mounted on micro-creep tester and subjected to thermo-mechanical cycling for various holding temperatures and tensile stresses. The result shows that the displacement instability near the horizontal groove decreases significantly as the tensile stress increases, while that near the vertical groove increases with the tensile stress. The higher temperature can cause bigger displacement instability for vertical and horizontal grooves. It is also found that the addition of the yttrium into the substrate considerably improves the interface roughness leading to smaller displacement instability compared to that without yttrium doped.

Info:

Periodical:

Advanced Materials Research (Volumes 79-82)

Edited by:

Yansheng Yin and Xin Wang

Pages:

675-678

DOI:

10.4028/www.scientific.net/AMR.79-82.675

Citation:

J. Ding et al., "Experimental Investigation to the Displacement Instability of TGO Near Surface Groove in TBCs due to Thermo-Mechanical Cycles", Advanced Materials Research, Vols. 79-82, pp. 675-678, 2009

Online since:

August 2009

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Price:

$35.00

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