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000016594 0247_ $$2DOI$$a10.1016/j.surfcoat.2011.06.032
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000016594 084__ $$2WoS$$aMaterials Science, Coatings & Films
000016594 084__ $$2WoS$$aPhysics, Applied
000016594 1001_ $$0P:(DE-Juel1)VDB77586$$aKarger, M.$$b0$$uFZJ
000016594 245__ $$aAtmospheric plasma sprayed thermal barrier coatings with high segmentation crack densities: Spraying process, microstructure and thermal cycling behavior
000016594 260__ $$aAmsterdam [u.a.]$$bElsevier Science$$c2011
000016594 300__ $$a16 - 23
000016594 3367_ $$0PUB:(DE-HGF)16$$2PUB:(DE-HGF)$$aJournal Article
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000016594 440_0 $$05670$$aSurface and Coatings Technology$$v206$$x0257-8972$$y1
000016594 500__ $$aThis work was partially supported by the EC ("TOPPCOAT", Project No. AST4-CT-2005-516149). The author thanks K.H. Rauwald, R. Laufs and F. Vondahlen for plasma spraying the specimen and M. Kappertz, Dr. D. Sebold and Dr. D.E. Mack for their experimental contribution to this work.
000016594 520__ $$aThermal barrier coatings (TBCs) with high strain tolerance are favorable for application in hot gas sections of aircraft turbines. To improve the strain tolerance of atmospheric plasma sprayed (APS) TBCs, 400 mu m-500 mu m thick coatings with very high segmentation crack densities produced with fused and crushed yttria stabilized zirconia (YSZ) were developed. Using a Triplex II plasma gun and an optimized spraying process, coatings with segmentation crack densities up to 8.9 cracks mm(-1), and porosity values lower than 6% were obtained. The density of branching cracks was quite low which is inevitable for a good inter-lamellar bonding. Thermal cycling tests yielded promising strain tolerance behavior for the manufactured coatings. Samples with high segmentation crack densities revealed promising lifetime in burner rig tests at rather high surface (1350 degrees C) and bondcoat temperatures (up to 1085 degrees C), while coatings with lower crack densities had a reduced performance. Microstructural investigations on cross-sections and fracture surfaces showed that the segmentation crack network was stable during thermal shock testing for different crack densities. The main failure mechanism was delamination and horizontal cracking within the TBC near the thermal grown oxide layer (TGOs) and the TBC. (C) 2011 Elsevier B.V. All rights reserved.
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000016594 65320 $$2Author$$aPlasma spraying
000016594 65320 $$2Author$$aSegmentation cracks
000016594 65320 $$2Author$$aDense vertically cracked
000016594 65320 $$2Author$$aThermal barrier coatings
000016594 65320 $$2Author$$aYttria-stabilized zirconia (YSZ)
000016594 650_7 $$2WoSType$$aJ
000016594 7001_ $$0P:(DE-Juel1)129670$$aVaßen, R.$$b1$$uFZJ
000016594 7001_ $$0P:(DE-Juel1)129666$$aStöver, D.$$b2$$uFZJ
000016594 773__ $$0PERI:(DE-600)1502240-7$$a10.1016/j.surfcoat.2011.06.032$$gVol. 206, p. 16 - 23$$p16 - 23$$q206<16 - 23$$tSurface and coatings technology$$v206$$x0257-8972$$y2011
000016594 8567_ $$uhttp://dx.doi.org/10.1016/j.surfcoat.2011.06.032
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