Some Practical Aspects of Corrosion and Coatings in Utility Gas Turbines

Grünling, H.W.; Rechtenbacher, H; Singheiser, L.

doi:10.4028/www.scientific.net/msf.251-254.483

Cited by 15 publications

(14 citation statements)

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“…The columnar microstructure is desirable in thermal-barrier-coating applications. 9 If similar results can be obtained for films of ZrO 2 , then the properties of the pulsed-CVD process portend well for application to thermal barrier coating and, possibly, to other structural coatings.…”

Section: Analysis and Resultssupporting

confidence: 56%

Conversion Efficiency of Alkoxide Precursor to Oxide Films Grown by an Ultrasonic‐Assisted, Pulsed Liquid Injection, Metalorganic Chemical Vapor Deposition (Pulsed‐CVD) Process

Krumdieck

Raj

1999

Journal of the American Ceramic Society

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Polycrystalline coatings of an oxide, with a columnar grain morphology, were grown on metal substrates from metalorganic precursors using the pulsed-CVD process. In a model study, films of the rutile phase of titanium dioxide were grown on nickel by thermal decomposition of titanium isopropoxide. Growth rates of up to 0.3 µm/min were obtained with conversion efficiencies (mole oxide per mole precursor) approaching 100%. The high growth rates and conversion efficiencies portend the application of this method for the manufacture of films and coatings on large surface areas, as, for example, required in the deposition of zirconium dioxide on nickel-based superalloys to serve as thermal barrier coatings on turbine blades.

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Section: Analysis and Resultssupporting

confidence: 56%

Conversion Efficiency of Alkoxide Precursor to Oxide Films Grown by an Ultrasonic‐Assisted, Pulsed Liquid Injection, Metalorganic Chemical Vapor Deposition (Pulsed‐CVD) Process

Krumdieck

Raj

1999

Journal of the American Ceramic Society

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“…As a rule of thumb an alumina scale thickness of about 10±15 lm is often regarded as the borderline for continued safe TBC operation [43] which was confirmed for noncyclic oxide growth by life prediction modeling. [44] Scale spallation on flat surfaces is induced when 1) compressive shear cracks are initiated (ªwedgingº, strong metal/oxide interfaces) or 2) out-of-plane stresses (locally) exceed the interfacial strength of the metal/TGO interface (ªbucklingº, weak metal/ oxide interfaces).…”

Section: Thermal Stress Related Aspects Of Tbc Failurementioning

confidence: 99%

EB-PVD Thermal Barrier Coatings for Aeroengines and Gas Turbines

Peters,

Leyens,

Schulz

et al. 2001

Adv. Eng. Mater.

162

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“…The morphology of the films changes from a grainy to a columnar structure, with the zinc concentration and substrate withdrawal speed decreasing from (0.55 M , 18 cm/min: thick individual layers) to (0.1 M , 2 cm/min: very thin individual layers) regardless of the precursor system used. This result is quite interesting because the columnar microstructure is desirable in thermal‐barrier‐coating applications 31 . Usually, a columnar structure of the deposits is found in the sputtering process on single crystal 15,32 or amorphous substrates 33 .…”

Section: Resultsmentioning

confidence: 98%

Effects of Individual Layer Thickness on the Microstructure and Optoelectronic Properties of Sol–Gel‐Derived Zinc Oxide Thin Films

Tahar

Salah

et al. 2008

Journal of the American Ceramic Society

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Zinc oxide (ZnO) thin films were prepared under different conditions on glass substrates using a sol–gel process. The microstructure of ZnO films was investigated by means of diffraction analysis, and plan‐view and cross‐sectional scanning electron microscopy. It was found that the preparation conditions strongly affected the structure and the optoelectronic properties of the films. A structural evolution in morphology from spherical to columnar growth was observed. The crystallinity of the films was improved and columnar film growth became more dominant as the zinc concentration and the substrate withdrawal speed decreased. The individual layer thickness for layer‐by‐layer homoepitaxy growth that resulted in columnar grains was <20 nm. The grain columns are grown through the entire film with a nearly unchanged lateral dimension through the full film thickness. The columnar ZnO grains are c‐axis oriented perpendicular to the interface and possess a polycrystalline structure. Optical transmittance up to 90% in the visible range and electrical resistivity as low as 6.8 × 10−3·Ω·cm were obtained under optimal deposition conditions.

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Some Practical Aspects of Corrosion and Coatings in Utility Gas Turbines

Cited by 15 publications

References 0 publications

Conversion Efficiency of Alkoxide Precursor to Oxide Films Grown by an Ultrasonic‐Assisted, Pulsed Liquid Injection, Metalorganic Chemical Vapor Deposition (Pulsed‐CVD) Process

Conversion Efficiency of Alkoxide Precursor to Oxide Films Grown by an Ultrasonic‐Assisted, Pulsed Liquid Injection, Metalorganic Chemical Vapor Deposition (Pulsed‐CVD) Process

EB-PVD Thermal Barrier Coatings for Aeroengines and Gas Turbines

Effects of Individual Layer Thickness on the Microstructure and Optoelectronic Properties of Sol–Gel‐Derived Zinc Oxide Thin Films

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