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Genre/Form: | Thèses et écrits académiques |
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Additional Physical Format: | Etude des barrières thermiques réalisées par la projection au plasma atmosphérique / Aamer Nusair Khan Lille : Atelier national de reproduction des thèses, 2003 Microfiches. (@Lille-Thèses) (ABES)246768983 |
Material Type: | Thesis/dissertation |
Document Type: | Book |
All Authors / Contributors: |
Aamer Nusair Khan; Jian Lu; Université de technologie (Troyes).; Ecole doctorale Sciences pour l'Ingénieur (Troyes, Aube). |
OCLC Number: | 491645859 |
Description: | 194 p. : ill., couv. ill. en coul. ; 30 cm. |
Responsibility: | Aamer Nusair Khan ; [sous la dir de] J. Lu. |
Abstract:
Thermal barrier coating (TBC) system consists of a metal bond coat and a ceramic topcoat (typically yttria stabilized zirconia). These coatings provide a thermal and oxidation barriers. These types of coatings are currently used only for component life extention at current operating temperatures. They are not used to increase the operating temperature of the engine. However, the developement of a TBC system, for which the probability of failure is sufficiently low, would allow these coatings to be used to increase the engine operating temperature and lead to significant improvement in engine performance. In this study different TBC systems were produced on the nickel base superalloy and stainless steel substrates by utilizing the air plasma spraying technique. Different TBC aspects were studied such as the role of microstructure and the residual stresses, the cracking and the spalling of TBCs under different conditions, and the interfacial thoughness between the different layers as a function of different parameters. A good quality TBC, with thickness up to 530 æm, were sprayed both on superalloy and stainless steel substrates. The final deposition temperature and the distance between the torch and the specimens were found as the more important paramters. An empirical equation was proposed relating the different spraying parameters and the number of thermal cycles. A comparison with different published results demonstrated that our TBC, produced by air plasma spraying, sustained more number of cycles.
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