PhD opportunities

Study of Al-based powder characteristics tailored for cold spray

Thesis proposal

Area of expertiseMaterials science and engineering
Doctoral SchoolSMI - Sciences des Mtiers de l'Ingnieur
SupervisorM. Michel JEANDIN
Research unitCentre of materials
ContactJEANDIN Michel
KeywordsCold spray, powder, aluminum, laser shock
AbstractCold gas dynamic spray, namely cold spray, is one of the most innovative thermal spray processes. The number of industrial applications for cold spray has been growing dramatically over the past 10 years. However, relevant advances can (must) be still expected from the tailoring of spray powders to the process through the dynamic mechanisms which are involved for deposition and densification. Up to now, powders for cold spray are conventionally selected among commercial powders which were formerly designed for conventional thermal spray, e.g. plasma spray and HVOF. These powders should be improved due to the mere fact that in higher temperature processes such as plasma spray, the particles can homogenize due to (at least partial) melting. In contrast, in cold spray, the particles remain at the solid state, which results in other requirements/specifications for suitable deposition and densification processes.
The scientific objective of the thesis is to determine the main powder characteristics (primarily when applied to Al-based materials) to promote particle-to-particle and particle-substrate adhesion phenomena and to improve coating build-up mechanisms. These characteristics are morphological, metallurgical, mechanical and physicochemical.
The study will show the various following stages:
Morphological analysis (for elementary particles and using statistics when applied to the powder batch) for one-material powder and for blends.
In-flight particle velocity measurements
Numerical simulation of particle impact and modeling of coating build-up
Laser shock experimental simulation of cold spray
Microstructural study of particles and testing for the assessment of related particle mechanical properties
Adhesion studies at particle-particle and particle-substrate interfaces.
ProfileTypical profile for a thesis at MINES ParisTech: Engineer and / or Master of Science - Good level of general and scientific culture. Good level of knowledge of French (B2 level in french is required) and English. (B2 level in english is required) Good analytical, synthesis, innovation and communication skills. Qualities of adaptability and creativity. Teaching skills. Motivation for research activity. Coherent professional project.

Applicants should supply the following :
a detailed resume
a covering letter explaining the applicants motivation for the position
detailed exam results
two references : the name and contact details of at least two people who could be contacted
to provide an appreciation of the candidate
Your notes of M1, M2
level of English equivalent TOEIC

to be sent to
FundingContrat de recherche