Use this URL to cite or link to this record in EThOS: | https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.719569 |
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Title: | Investigation on thermal barrier coating and thermal behaviour at high temperature | ||||||
Author: | Ding, Siwen |
ISNI:
0000 0004 6351 5589
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Awarding Body: | University of Nottingham | ||||||
Current Institution: | University of Nottingham | ||||||
Date of Award: | 2017 | ||||||
Availability of Full Text: |
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Abstract: | |||||||
The oxidation behaviour of diffusion and overlay coating, manufactured by pack cementation and high velocity oxygen fuel (HVOF) techniques, was studied under isothermal condition at a temperature of 1100 °C for up to 500 hours. Detailed analysis on oxide thickness coupled with cross section microstructure observation was carried out. The results shown sub-parabolic oxide growth for all samples. To simulate a real operating condition for the thermal barrier coating (TBC) system, high temperature oxy-acetylene flame based burner rig was designed, manufactured and calibrated. A maximum surface temperature of 1400 °C detected by a single wavelength pyrometer with a 700 °C through sample thickness thermal gradient was achieved. A TBC system in which the ceramic top layer deposited by air plasma spray (APS) technique was tested under such condition. Several damage/failure types were identified in comparison with samples tested under isothermal loading. A novel physical based mathematical moving boundary problem model utilizing asymptotic analysis that predicts the growth of the oxide layer on a binary bond coat system was proposed. The governing equations were discretized and solved numerically using finite difference and Newton’s iteration method respectively. Numerical results obtained from this model had shown a good qualitative agreement from comparison with the experimental studies.
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Supervisor: | Not available | Sponsor: | Not available | ||||
Qualification Name: | Thesis (Ph.D.) | Qualification Level: | Doctoral | ||||
EThOS ID: | uk.bl.ethos.719569 | DOI: | Not available | ||||
Keywords: | TA Engineering (General). Civil engineering (General) | ||||||
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