Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/65157
Full metadata record
DC FieldValueLanguage
dc.contributor.authorYeow, Elizabeth Maria Hui Shi
dc.date.accessioned2015-06-15T05:50:47Z
dc.date.available2015-06-15T05:50:47Z
dc.date.copyright2015en_US
dc.date.issued2015
dc.identifier.urihttp://hdl.handle.net/10356/65157
dc.description.abstractHigh pressure turbine blades in aircraft are subject to high temperatures, often above 1000˚C, during in-flight operations, thus the base metal requires protection from oxidation by an aluminide coating, which generates a protective oxide layer on top of itself. In this study, research was carried out to develop a standard, via oxidation experiments and subsequent characterisation of the oxide layer, by which the coating of turbine blades could be categorized as in need of re-coating. After carrying out preliminary testing using uncoated iron alloys, the experimental methods for nickel alloys as the base metal for the coated samples were determined and carried out. The results of isothermal oxidation of nickel alloy samples show that, for a holding time of 5h, oxide layer growth and the formation of the stable α phase of aluminium oxide Al2O3 starts even at lower temperatures of 750˚C, although it is only the major phase when the sample is heated to 1100˚C for 100h. The aluminium content in the coating also declined with heating temperature and holding time due to both outward diffusion to form the coating, and inward diffusion to the substrate. In addition, it was found that heating to temperatures of up to 1100˚C for 100h produced an oxide layer of up to 6.9μm. These observations are sufficient in monitoring the growth pattern of the oxide, although not its depletion. Neither a decrease in oxide layer thickness, nor a decline in the aluminium content of the sample to below the acceptable limit, was observed with increasing temperature and heating time. This work is carried out in collaboration between NTU, Advanced Remanufacturing and Technology Centre (ARTC) and a company in the aerospace industry.en_US
dc.format.extent62 p.en_US
dc.language.isoenen_US
dc.rightsNanyang Technological University
dc.subjectDRNTU::Engineering::Mechanical engineeringen_US
dc.titleCharacterisation of thermal barrier coatingsen_US
dc.typeFinal Year Project (FYP)en_US
dc.contributor.supervisorGuo Wenjiang
dc.contributor.supervisorDavid Lee Butleren_US
dc.contributor.schoolSchool of Mechanical and Aerospace Engineeringen_US
dc.description.degreeBachelor of Engineering (Mechanical Engineering)en_US
item.fulltextWith Fulltext-
item.grantfulltextrestricted-
Appears in Collections:MAE Student Reports (FYP/IA/PA/PI)
Files in This Item:
File Description SizeFormat 
FYP Report - Final Online Submission.pdf
  Restricted Access
991.18 kBAdobe PDFView/Open

Page view(s)

350
Updated on Jul 18, 2024

Download(s) 50

18
Updated on Jul 18, 2024

Google ScholarTM

Check

Items in DR-NTU are protected by copyright, with all rights reserved, unless otherwise indicated.