Oxidation Damage of APS Thermal Barrier Coatings under High Temperature

Abstract:

Article Preview

Thermal barrier coatings (TBCs) have received increased attention for advanced gas turbine engine application. The oxidation damage plays an important role of the failure under high temperature load. An Y2O3 partially stabilized ZrO2 ceramic top coating was deposited a NiCrAlY bond coating by air plasma spray (APS). The substrate was directionally solidified superalloy (DZ40M). Isothermal oxidation has been performed at 700 and 1050 for 100h. The oxidation results in three transformations of the weight, the interface and the surface characters. All the specimens were characterized by highly precision balance, scanning electron microscopy (SEM) in cross-section, microscope with MFK2 visual measurement system on its surface. The curve of oxidation kinetics is obtained by weighting those specimens. The weight gain of the specimen under 700 is close to zero. Under 1050 the weight gain is very distinct. On the other hand, the interface cracks occur and extend at the interface between the ceramic and bond coating by SEM method. The thermal growth oxide (TGO) gradually appears on the coating surface under high temperature oxidation by MFK2. Last but not least, those observations will provide some ideas and damage parameters for the non-destructive inspection (NDI) for TBC under thermal load.

Info:

Periodical:

Key Engineering Materials (Volumes 324-325)

Edited by:

M.H. Aliabadi, Qingfen Li, Li Li and F.-G. Buchholz

Pages:

595-598

DOI:

10.4028/www.scientific.net/KEM.324-325.595

Citation:

H. Y. Qi et al., "Oxidation Damage of APS Thermal Barrier Coatings under High Temperature", Key Engineering Materials, Vols. 324-325, pp. 595-598, 2006

Online since:

November 2006

Export:

Price:

$35.00

[1] QI Hongyu: Chinese Journal of aeronautics. Vol. 18(2005), p.180.

[2] Dongming Zhu: Furnace cyclic oxidation behavior of multi-component low conductivity thermal barrier coatings. (NASA/TM-2004-212962).

[3] Nitta A: J Japan Soc. Mech. Eng. Vol. 99(1996), p.251.

[4] Yuri I, Hisamatsu T. J: Eng for Gas Turbines and Power. Vol. 119(1997), p.506.

[5] He M. Y, Hutchinson J. W: Materials Science and Engineering. Vol. A345(2003), p.172.

[6] Pan D, Chen M. W, Wright P. K: Acta Materialia. Vol. 52(2003), p.2205.

[7] Thompson J.A., Clyne T. W: Acta mater. Vol. 49(2001), p.1565.

[8] Scott Gregory: Evolution of microstructure during the growth of thermal barrier coatings by electron-beam physical vapor deposition. (University of California Press, Santa Barbara. 2001).

[9] More J: The Levenberg-Marquadt algorithm. (Springer Verlag, Berlin. 1978). TGO TGO.

In order to see related information, you need to Login.