Effect of Aluminum Oxide Diffusion Barrier Layer on the Oxidation Behavior of Detonation Gun-Sprayed Thermal Barrier Coating at 1,200°C

Autor:	X.Q. Ma, M.C. Kim, Y. M. Rhyim, C.G. Park, H.W. Jin
Rok vydání:	1999
Předmět:	Materials science Diffusion barrier General Chemical Engineering High-temperature corrosion Metallurgy Detonation General Chemistry Corrosion Thermal barrier coating General Materials Science Cubic zirconia Surface layer Composite material Layer (electronics)
Zdroj:	CORROSION. 55:805-813
ISSN:	1938-159X 0010-9312
DOI:	10.5006/1.3284037
Popis:	Zirconium oxide or zirconia (ZrO2)-based thermal barrier coatings (TBC) and aluminum oxide (Al2O3) layers were fabricated by detonation gun (D-gun) spraying. Al2O3 layers with thicknesses of 50 μm, 150 μm, or 250 μm were applied to a duplex TBC system as an intermediate layer or a surface layer, and their effects on the oxidation behavior of the TBC coatings were investigated at 1,200°C. Oxidation kinetics showed that the suitable application of Al2O3 layers suppressed the oxidation of the Ni-Cr-Al-Y bond coat, and the oxidized rates were partially dependent on the thickness of the Al2O3 layers. In the case of an Al2O3 layer applied onto the surface, the durability and integrity of the TBC coatings were improved remarkably and the oxidation resistance was enhanced. However, a deteriorating spallation occurred for the specimens with an Al2O3 intermediate layer thicker than 50 μm. The main failure modes were identified based on microstructural analyses.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::a5b7276def3d2e095185f38712a3baeb https://doi.org/10.5006/1.3284037 Zobrazit plný text záznamu