Investigation on thermal barrier coating and thermal behaviour at high temperature

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Ding, Siwen (2017) Investigation on thermal barrier coating and thermal behaviour at high temperature. PhD thesis, University of Nottingham.

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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.

Item Type: Thesis (University of Nottingham only) (PhD)
Supervisors: Yan, Yuying
Billingham, John
Lawes, Simon
Hou, Xianghui
Keywords: Diffusion coatings, Thermal barrier coatings, Materials at high temperatures
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Faculties/Schools: UK Campuses > Faculty of Engineering
Item ID: 41696
Depositing User: Ding, Siwen
Date Deposited: 13 Jul 2017 04:40
Last Modified: 12 Oct 2017 22:30
URI: https://eprints.nottingham.ac.uk/id/eprint/41696

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