The European Ceramic Society

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Apr 21, 2022

Elaboration and characterization of ceramic materials obtained by Binder Jetting for Power Electronics

Context

             
In the field of Power Electronics, the use of increasingly integrated systems as well as increasingly high operating temperatures and powers require a major change in the materials used and their shaping. 

Indeed, the trend in this field, as has been the case in Electronics, is the reduction in size and mass of passive components and their integration to form a more compact module. Ceramics are ideal candidates to meet these needs. Indeed, their bonds are of a covalent and/or ionic nature, thus giving them various functional properties (electrical, thermal, magnetic, optical, etc.), remarkable mechanical properties and excellent thermal and chemical stability. A strong demand concerns the development of ceramics with complex geometries which make it possible to obtain unequaled properties up to now and for which additive manufacturing techniques can meet these challenges. With this objective in mind that this thesis aims to study an innovative additive elaboration route, powder bed printing by binder jetting, which seems particularly well suited to the elaboration of complex ceramics parts based on oxides (but also nitrides, carbides, etc.) for applications aimed at Power Electronics and the production of discrete components.

            
Thesis description

              
This research work aims to develop ceramic parts with complex and compact shapes and specific microstructures thanks to this innovative manufacturing technique, and to study their structural, microstructural, thermal and dielectric properties. Two model materials, used in the EP modules will first be developed with Binder Jetting: pure barium titanate BaTiO3 and doped with strontium (Ba1-xSrxTiO3), basic dielectric material of ceramic capacitors and aluminum nitride AlN, an excellent current thermal conductor used as a substrate. The structure, the microstructure of these materials will be determined at each stage of the production process: after printing then debinding/sintering. The challenge here is to be able to control the microstructure (grain size, porosity, homogeneity, density, etc.) of these materials produced under these conditions. Very few studies have been published on the subject, which underlines the interest of this thesis work. Then, the physical properties of Ba1-xSrxTiO3 (permittivity and dielectric losses) and of AlN (thermal conductivity) will be studied and correlated with microstructural and electrical characterizations.
This project relies on the know-how of the OVM team and on the facilities available in the regional additive manufacturing platform by Binder Jetting 3D CAMP. At the international and national level, few teams have this recent equipment and, moreover, the development of complex ceramic shapes by Binder Jetting remains very rare for targeted applications. Collaborations with laboratories working in the field of Power Electronics, and
Electrical Engineering t (LGP-Tarbes, LAPLACE-Toulouse, SIAME, Pau) are already set in order to better understand the issues related to passive components in a module.

          
Thesis start date: october 2022
Profile of the candidate : The candidate must present solid knowledge in Materials Science. Skills in electrical properties will be appreciated. The candidate must enjoy experimental and team work.
Location : CIRIMAT/ Site Université Toulouse 3, Campus de Rangueil
Salary : indexed to the doctoral allowance
Application :
Please send your CV and cover letter to:
S. Guillemet-Fritsch (CNRS Senior Researcher, team Oxydes à Valence Mixte) : sophie.guillemet@univ-tlse3.fr

L. Presmanes (CNRS Senior Researcher, head of team Oxydes à Valence Mixte) : lionel.presmanes@univ-tlse3.fr

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