Journal ArticleDOI
Thermal expansion of MCrAlY alloys
T.A. Taylor,P.N. Walsh +1 more
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TLDR
In this article, the thermal expansion behavior of thirteen plasma-sprayed MCrAlY and related coatings, plus Tribomet TM-309 and its NiCo matrix were determined, and the model equations gave calculated expansions at 525 and 825 °C within a few 0.1 mm/m of the original measurement.Abstract:
The thermal expansion behaviors of thirteen plasma-sprayed MCrAlY and related coatings, plus Tribomet TM-309 and its NiCo matrix were determined. Replicate runs to 1100 °C in argon for all coatings allowed the experimental variability and reliability of differences between coatings to be described. Wet chemical analysis of eight samples allowed multiple correlations between coating expansion and composition to be found. The model equations give calculated expansions at 525 and 825 °C within a few 0.1 mm/m of the original measurement for most coatings. The model and the original expansion data both show a NiCrAlY alloy, such as LN-33 has significantly lower expansion than current CoNiCrAlY coatings. Using low expansion NiCrAlY as a bondcoat is predicted to generate longer thermal cycle life of TBC coatings due to reduced expansion-induced interface stress with the YSZ ceramic.read more
Citations
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Adhesion improvements of Thermal Barrier Coatings with HVOF thermally sprayed bond coats
TL;DR: In this article, the general characteristics and adhesion properties of thermal barrier coatings (TBCs) having bond coats applied using High Velocity Oxygen Fuel (HVOF) thermal spraying and plasma sprayed ceramic top coats are studied.
Journal ArticleDOI
Processing and design methodologies for advanced and novel thermal barrier coatings for engineering applications
TL;DR: A comprehensive review of various processing techniques and design methodologies for thermal barrier coatings is presented in this article, where the emphasis is on the particle technology; the interrelationship between particle preparation, modification and the resulting properties, to assist developments in advanced and novel thermal barrier coating for engineering applications.
Journal ArticleDOI
Damage mechanisms, life prediction, and development of EB-PVD thermal barrier coatings for turbine airfoils
TL;DR: In this article, the authors present a review of engine-operative TBC damage mechanisms and the requirements for life methods that enable a designer and engine operator to achieve acceptable TBCed component lives.
Journal ArticleDOI
Evaluation of residual stresses of thermal barrier coatings with HVOF thermally sprayed bond coats using the Modified Layer Removal Method (MLRM)
TL;DR: In this paper, the residual stresses due to mismatch between metallic bond coat and ceramic top coat as well as the stresses caused by the oxidation of the bond coat generate debonding of the TBC, leading to a collapse of all thermal barrier system.
Journal ArticleDOI
Preparation and oxidation behaviour of nanocrystalline Ni + CrAlYSiN composite coating with AlN diffusion barrier on Ni-based superalloy K417
TL;DR: In this article, a Ni + CrAlYSiN composite coating was prepared on a Ni-based superalloy K417 by vacuum arc evaporation, mainly consisting of nanocrystalline gamma-Ni, fcc-AlN and fcc -CrN.
References
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Journal ArticleDOI
Development of alloyed and dispersion-strengthened MCrAlY coatings
TL;DR: In this article, the effects of the separate and combined additions of Ta, Pt and an oxide dispersion to basic MCrAlY overlay coatings were investigated in cyclic burner rig testing at 1050°C.
Journal ArticleDOI
Thermal properties and microstructure of two thermal barrier coatings
TL;DR: In this paper, two plasma sprayed yttria stabilized zirconia coatings are described in terms of their microstructure, and the thermal properties, including thermal expansion, thermal diffusivity and specific heat, were measured from room temperature to 1200°C.