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Showing 1 to 12 of 12 for “"thermally grown oxide"”.
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Air Plasma Sprayed Thermal Barrier Coatings: Experiments and Finite Element Analysis
… substrate, a MCrAlY bond coat, a thin layer of thermally grown oxide (TGO) which thickens during service, and an air-plasma sprayed yttria-stabilized zirconia (YSZ) coating. </p> <p> Growth of the TGO layer, rumpling, and aluminum depletion from the bond coat were modeled using finite element …
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Nondestructive Analysis of Advanced Aerospace Materials via Spectroscopy and Synchrotron Radiation
… studies on the stress state of the thermally grown oxide (TGO) within the thermal barrier coatings, on a hollow cylindrical specimen, provided results that indicate variations within the TGO. Comparison of measured photo-luminescence spectra of the specimen before and after long …
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Heating it up: a novel approach to annealing soluble organic semiconductors
… which is used as the gate. A 400nm thick thermally grown oxide is used to insulate the semiconductor gate from the Ti/Au source and drain leads. The as-deposited TES-ADT film is amorphous, and recent work by the Anthony group at the University of Kentucky has shown that this film can be …
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In-situ synchrotron studies of turbine blade thermal barrier coatings under extreme environments
… coat. Through exposure to high temperature, a Thermally Grown Oxide (TGO) layer develops at the bond coat-YSZ interface. Large residual stresses develop in these layers due to thermal expansion mismatch that occurs during cool down from high temperature spraying and cyclic operating conditions. …
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Degradation and Failure Analysis of Environmental Barrier Coatings under Adverse Operating Environment: Multi-Physics Modelling
… delamination along the interfaces of thermally grown oxide (TGO) poses major challenges to coating reliability. This research presents a systematic study of the degradation of bi-layer Yb₂Si₂O₇/Si EBCs using COMSOL Multiphysics methodologies. Thermal cycle-induced temperature fields …
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Influence of composition and processing on the oxidation behavior of MCrAlY-coatings for TBC applications
The adherence of the thermally grown oxide (TGO) to the bond coat is recognized to be crucial for the lifetime of thermal barrier coatings (TBC) in aircraft engine and gas turbine blades. The stability of the system has to be guaranteed over extended service times (around 25000h) at high operation …
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Synchrotron X-Ray Diffraction and Piezospectroscopy used for the Investigation of Individual Mechanical Effects from Environmental Contaminants and Oxide Layer Undulations in Thermal Barrier Coatings
… the Yttria Stabilized Zirconia Topcoat (YSZ) and Thermally Grown Oxide (TGO) strain in sprayed Thermal Barrier Coating (TBC) samples of varying porosity with and without CMAS ingression. In-Situ Synchrotron X-ray Diffraction measurements were taken on the sample under thermal loading conditions …
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Effects Of Bond Coat Surface Preparation On Thermal Cycling Lifetime And Failure Characteristics Of Thermal Barrier Coatings
… characteristics of the bond coat and the thermally grown oxide (TGO) scale were initially documented by surface roughness, phase constituents of the TGO scale, and residual stress of the TGO scale. The thermal cycling test consisted of 10-minute heat-up to 1121°C, 40-minute hold at …
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Effectiveness of Thermal Oxidation in Relation to Anterior Cervical Plates
… may damage a section of the protective oxide layer, potentially exposing surrounding tissues to the harmful effects of bare titanium, aluminum, and vanadium. Thermal oxidation has been shown to improve corrosion-resistance and wear-resistance, depending on temperature and time. To …
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Electro-thermal nanoprobes for nanometrology and nanofabrication
… a metal electrode insulated from the heater with thermally grown oxide. Both designs were extensively characterized and demonstrate good electrical isolation between active elements until the voltage potential difference reaches ~ 10 V. The metalized electro-thermal microcantilever was used to …
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Ferritic steel interconnectors and their interactions with Ni base anodes in solid oxide fuel cells (SOFC)
… most widespread construction materials for solid oxide fuel cell (SOFC) interconnects mainly due to low cost and the ease of fabrication compared to ceramic materials. It was shown that optimum properties with respect to oxide scale growth and adherence could only be obtained by very low, …
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Nondestructive Evaluation Of Thermal Barrier Coatings With Thermal Wave Imaging And Photostimulated Luminescence Spectroscopy
… as-coated TBCs with varying thicknesses, and thermally-cycled TBCs for initiation and progression of subcritical-subsurface damage as a function of thermal cycling. TWI and thermal response amplitude were correlated to the microstructural characteristics and damage progression of TBCs based on …