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Evolution of residual stress in environmental barrier coatings for ceramic matrix composites

  • Full or part time
  • Application Deadline
    Friday, January 24, 2020
  • Funded PhD Project (European/UK Students Only)
    Funded PhD Project (European/UK Students Only)

Project Description

Ceramic matrix composites (CMCs) are exciting new materials for use in gas turbine engines, in which an environmental barrier coating (EBC) is needed to protect the CMCs from water vapour attack. The coating also serves as a thermal barrier coating (TBC). The EBC is a prime reliant coating (unlike a TBC), without which CMC components would have very limited life in the harsh gas turbine engine operating environments.

One major factor governing the life of an EBC is its residual stress state, which results from the quenching process of its manufacture via the thermal spray process and the cooling after spraying. The coating stress state also changes with thermal excursions such as heat-treatment and engine operations. This is because of factors that include the mismatch of coefficients of thermal expansion (CTE), thermal gradients, coating crystallization, phase change and sintering, among others.

This iCASE project, supported by Rolls-Royce Plc, aims to develop new understanding and models for coating stress evolution including the effects of EBC crystallization, phase change, sintering, and thermal mechanical loading. Both testing such as hole-drilling using focused ion beam with image correlation, and the finite element method that incorporates creep of the Si bond coat, for example, will be part of the project scope.

Candidates are considered in the January 2020 admissions cycle which has an application deadline of 24 January 2020.

Any questions concerning the project can be addressed to Professor James Marrow (). General enquiries on how to apply can be made by e mail to . You must complete the standard Oxford University Application for Graduate Studies. Further information and an electronic copy of the application form can be found at http://www.ox.ac.uk/admissions/postgraduate_courses/apply/index.html.

Funding Notes

This is a 4-year EPSRC Industrial CASE studentship in conjunction with Rolls Royce Plc and will provide full fees and maintenance for a student who has home fee status (this includes an EU student who has spent the previous three years (or more) in the UK undertaking undergraduate study). Candidates with EU fee status are eligible for a fees-only award, but normally would have to provide funding for their living costs from another source such as personal funds or a scholarship. The stipend will be at least £17,009 per year. Information on fee status can be found at View Website.

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