02/10/2020
The Human Resources Strategy for Researchers
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PhD Project (Man/Woman) in science of the sintering of granular materials

This job offer has expired


  • ORGANISATION/COMPANY
    CNRS
  • RESEARCH FIELD
    EngineeringMaterials engineering
    PhysicsAcoustics
  • RESEARCHER PROFILE
    First Stage Researcher (R1)
  • APPLICATION DEADLINE
    23/10/2020 23:59 - Europe/Brussels
  • LOCATION
    France › AUBERVILLIERS,AUBERVILLIERS
  • TYPE OF CONTRACT
    Temporary
  • JOB STATUS
    Full-time
  • HOURS PER WEEK
    35
  • OFFER STARTING DATE
    01/12/2020
  • EU RESEARCH FRAMEWORK PROGRAMME
    H2020 / Marie Skłodowska-Curie Actions

OFFER DESCRIPTION

This PhD Project will take place mostly at the Glass surface and Interfaces, localized in the RD research center of Saint-Gobain Research Paris, in Aubervilliers. Some experiments will be made at the ESRF synchrotron in Grenoble and exchanges will be made between our laboratory and another laboratory (SIMAP) where another PhD student is working in a related subject.

Thermal effects on micro-structural evolution during capillary-driven sintering. During the sintering process, particles deform at elevated temperatures through various mechanisms and then reform (i.e. densify) on cooling to produce either a fully dense or a partially dense material. The porosity of the reformed structure (and ultimately the functional quality of the final product) is affected by the microstructural changes that occur on rearrangement; for example, a high surface tension in the melt liquids (which is found with molten oxides) can induce capillary forces, which are known to detract from optimal sintering conditions. However, monitoring microstructural changes has historically proved challenging and studies to date have mainly focused on phenomenological characterization. Fortunately, recent advances in synchrotron X-ray tomography enable the fast acquisition (in a few seconds) of 3D images with a high enough spatial resolution (1μm) to examine the evolution of liquids or of granular materials in-situ. The PhD student will therefore use the latest in-situ X-ray tomography techniques to systematically explore the effects of capillary interactions in the melt liquids on porosity. She/he will first study the sintering of powder mixtures when a component has a lower fusion temperature or using inert grains (e.g. fusible materials, such as glass and oxides, and refractory materials) so that only a fraction of the structure will transform into a liquid phase. Using the synchrotron at ESRF, she/he will then examine the structural evolution and phase transformation and then explore how to control porosity in heterogeneous systems using the liquid phase produced at high temperatures by systematically changing the sintering conditions and the initial packing structure. She/he will also establish the sintering conditions at which the collapse of the granular structure under the capillary forces can be avoided and characterize the final structure and porosity of different initial structured aggregates. She/he will then use model granular materials (polymers, ice) to assess the capillary effects by changing the surface tension, viscosity or wettability.

More Information

Additional comments

This PhD project is part of the research program MATHEGRAM https://www.surrey.ac.uk/mathegram which is a network of 15 projects on the subject of the granular materials at high temperature. The gross salary is therefore around 3000€ gross monthly.

Web site for additional job details

Required Research Experiences

  • RESEARCH FIELD
    EngineeringMaterials engineering
  • YEARS OF RESEARCH EXPERIENCE
    None
  • RESEARCH FIELD
    PhysicsAcoustics
  • YEARS OF RESEARCH EXPERIENCE
    None

Offer Requirements

  • REQUIRED EDUCATION LEVEL
    Engineering: Master Degree or equivalent
    Physics: Master Degree or equivalent
  • REQUIRED LANGUAGES
    FRENCH: Basic
Work location(s)
1 position(s) available at
Surface du verre et interface
France
AUBERVILLIERS,AUBERVILLIERS

EURAXESS offer ID: 564208
Posting organisation offer ID: 17898

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