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Reference : UMR5801-GERVIG2-015
Workplace : PESSAC
Date of publication : Wednesday, May 20, 2020
Type of Contract : FTC Scientist
Contract Period : 12 months
Expected date of employment : 15 June 2020
Proportion of work : Full time
Remuneration : From 2648 euros to 3768 euros per month before tax according to experience
Desired level of education : PhD
Experience required : 1 to 4 years
As per its internal needs CEA wishes to compare the thermomechanical performances of distinct C/SiC composites from different manufacturers. These light-weight, high-performance ceramic matrix composites (CMC) have outstanding resistance to mechanical stresses combined to high thermal fluxes and oxidizing atmospheres, though being less expensive to fabricate as compared to SiC/SiC composites.
This contract follows previous works that have opened many perspectives.
The planned actions in this contract are the following:
1 – Acquisition of information on microstructural and mechanical characterizations on the as-processed materials and bibliographical survey.
2 – Comparison of oxidation kinetics of the three materials.
3 – Monitoring the mechanical properties abatements after thermomechanical ageing, under a load equivalent to twice the proportionality limit, under air flow and at temperatures of 1000 and 1300°C :
- With continuous recording of Acoustic Emission signals and monitoring of the Electrical Resistance.
- With periodic measurements of residual mechanical properties until failure.
4 – Verification of non-degrading mechanical properties below 1000°C
5 – Post-test microstructural characterizations and comparison with other materials aged without mechanical loading.
6 – Design of specific experimental tests under shear loading on aged specimens
7 – If possible, interpretation of the results with the help of a 1D crack model for oxidation damage.
PhD in Materials Science or in Mechanics, with skills in Mechanics of Materials
The Laboratory for ThermoStructural Composites (LCTS) is a joint unit of CNRS, University of Bordeaux, CEA and the Safran group. It has 31 years of experience in developing research on the most up-to-date high-temperature advanced ceramics and composites, both by experiments and models. Its main research topics are (i) Design and development of fibre-reinforced ceramic composites and of cellular ceramics, (ii) Their physicochemical and structural characterization at all scales, (iii) Testing their behaviour under mechanical, thermal and/or oxidative loadings, (iv) Theory and simulation of the structure and behaviour of these materials and of their fabrication processes. With 30 permanent staff (including support), the lab has an average of ~20 PhD candidates and 4 post-doc researchers.
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