ISSN:
1013-9826
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Thermal barrier coatings (TBCs) were prepared by the recently-developed detonation gunspray process. The oxide scale formation and micro-damage evolution of these coatings duringoxidation in air at 1100 °C were investigated. It was found that duplex oxide scales, the upper oxidemixture scale and α-Al2O3 subscale, form at the interface between bond coat (BC) and top coat (TC)during the oxidation. Microcracks usually nucleate within the porous oxide mixture layer. With theincrease of oxidation time, some microcracks coalesce to form a long crack. Residual stress in thethermally grown oxides (TGO) was measured using photo-stimulated luminescence spectroscopy. Itwas found that compressive residual stress exhibits a fast increase at the beginning of oxidation up tomaximum value for about 10h. Then, the compressive stress begins to decline up to 100h. Local stressdistribution showed that the micro-damage in the TGO causes a remarkable decrease in the magnitudeof compressive residual stress
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/57/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.373-374.39.pdf
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