Synthesis of alpha‐Al
            <sub>2</sub>
            O
            <sub>3</sub>
            Template on Ni Superalloy Surface by Chemical Vapor Deposition

Su, Yi‐Feng; Torzilli, Michele A.; Meyer, J. D.; Lee, W. Y.; Lance, Michael J.; Rawn, Claudia J.; Ruppi, S.

doi:10.1002/9781118787694.ch2

Elevated Temperature Coatings 2001

DOI: 10.1002/9781118787694.ch2

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Synthesis of alpha‐Al ₂ O ₃ Template on Ni Superalloy Surface by Chemical Vapor Deposition

Yi‐Feng Su

Michele A. Torzilli

J. D. Meyer

et al.

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Cited by 2 publications

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Effects of an Electroplated Platinum Interlayer on the Morphology and Phases of Chemically‐Vapor‐Deposited Alumina on Single‐Crystal, Nickel‐Based Superalloy

Torzilli

Meyer

et al. 2002

Journal of the American Ceramic Society

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The feasibility of preparing a thin layer of α‐Al2O3 on the surface of a single‐crystal, Ni‐based superalloy was examined using a chloride‐based chemical vapor deposition (CVD) process previously developed for cutting tool applications. A coating directly deposited by this method on the alloy surface consisted of ∼1 μm α‐Al2O3 crystals in a matrix of amorphous Al2O3. When the alloy surface was predeposited with an electroplated Pt layer, the coating was mostly α‐Al2O3, but with the presence of fine microcracks on the coating surface. In comparison to the results observed for pure Pt substrate, the role of the Pt interlayer was apparently to promote the rapid formation of κ‐Al2O3 nuclei, which subsequently transformed to α‐Al2O3 during the CVD growth process.

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Effects of an Electroplated Platinum Interlayer on the Morphology and Phases of Chemically‐Vapor‐Deposited Alumina on Single‐Crystal, Nickel‐Based Superalloy

Torzilli

Meyer

et al. 2002

Journal of the American Ceramic Society

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Effects of Thin Mullite Coating on the Environmental Stability of Sintered Si₃N₄

Tsarenko

Lee

2004

Journal of the American Ceramic Society

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We investigated the effects of a chemically‐vapor‐deposited mullite coating (∼100 nm) on the oxidation resistance of sintered Si3N4 in air and steam environments. The coating was sacrificially incorporated into the thermally grown oxide (TGO) on Si3N4 during isothermal oxidation in air at 1400°C, leading to significantly reduced TGO growth as well as markedly improved TGO morphology. This improvement can be attributed to the refractory and viscous nature of the SiO2‐Al2O3 system, compared with SiO2, when under the influence of alkali and/or alkaline‐earth fluxing elements. However, the mullite coating had little effect on the stability of the ceramic in the steam environment at 1200°C, due likely to high activity of SiO2 in mullite.

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Synthesis of alpha‐Al ₂ O ₃ Template on Ni Superalloy Surface by Chemical Vapor Deposition

Cited by 2 publications

References 18 publications

Effects of an Electroplated Platinum Interlayer on the Morphology and Phases of Chemically‐Vapor‐Deposited Alumina on Single‐Crystal, Nickel‐Based Superalloy

Effects of an Electroplated Platinum Interlayer on the Morphology and Phases of Chemically‐Vapor‐Deposited Alumina on Single‐Crystal, Nickel‐Based Superalloy

Effects of Thin Mullite Coating on the Environmental Stability of Sintered Si₃N₄

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Synthesis of alpha‐Al 2 O 3 Template on Ni Superalloy Surface by Chemical Vapor Deposition

Cited by 2 publications

References 18 publications

Effects of an Electroplated Platinum Interlayer on the Morphology and Phases of Chemically‐Vapor‐Deposited Alumina on Single‐Crystal, Nickel‐Based Superalloy

Effects of an Electroplated Platinum Interlayer on the Morphology and Phases of Chemically‐Vapor‐Deposited Alumina on Single‐Crystal, Nickel‐Based Superalloy

Effects of Thin Mullite Coating on the Environmental Stability of Sintered Si3N4

Contact Info

Product

Resources

About

Synthesis of alpha‐Al ₂ O ₃ Template on Ni Superalloy Surface by Chemical Vapor Deposition

Effects of Thin Mullite Coating on the Environmental Stability of Sintered Si₃N₄