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KIANICOVÁ, M. SLÁMEČKA, K. POKLUDA, J.
Original Title
Damage of Diffusion Coatings on Turbine Blades
Type
conference paper
Language
English
Original Abstract
Nickel- and cobalt-based superalloys have been developed and are used in the hot sections of gas turbines in order to meet complex high-temperature phenomena. The gas temperature in modern engines exceeds 1650 C in the turbine section and its cooled parts reach temperatures as high as 1200 C. During operation, the structural materials degrade by fatigue, creep, oxidation, corrosion and erosive wear. Protective coatings provide barriers between the alloys and outer environment and, in particular, they enhance a resistance to oxidation and hot corrosion. The metallic coatings can be divided into two categories: diffusion and overlay coatings. Diffusion aluminide coatings (DAC) are based on the intermetallic compound beta-NiAl that forms under the influence of the substrate. Although DAC have been enjoying wide application, they have a limitation which arises from no deliberate changes of their properties to meet requirements of specific service conditions. This article is focused on a detection of damage that formed in the diffusion coatings on first stage turbine blades after two different short-term overheating events. Motivation for this study came from demands for an extension of our knowledge of degradation mechanisms. A possibility of a non-destructive assessment of the damage level using suitable damage parameters is also briefly described
Keywords
Diffusion aluminide coating, overheating, degradation parameter, creep, aircraft engine
Authors
KIANICOVÁ, M.; SLÁMEČKA, K.; POKLUDA, J.
RIV year
2011
Released
18. 5. 2011
Publisher
Tanger sro
Location
Ostrava
ISBN
978-80-87294-24-6
Book
METAL 2011 Conference Proceedings
Edition
Metal
Edition number
1
Pages from
840
Pages to
846
Pages count
7
BibTex
@inproceedings{BUT89317, author="Marta {Kianicová} and Karel {Slámečka} and Jaroslav {Pokluda}", title="Damage of Diffusion Coatings on Turbine Blades", booktitle="METAL 2011 Conference Proceedings", year="2011", series="Metal", number="1", pages="840--846", publisher="Tanger sro", address="Ostrava", isbn="978-80-87294-24-6" }