Scientific direction Development of key enabling technologies
Transfer of knowledge to industry

PhD : selection by topics

Engineering science >> Ultra-divided matter, Physical sciences for materials
1 proposition(s).

Additive manufacturing using ferrite powder for power electronics

Département des Technologies des NanoMatériaux (LITEN)

Laboratoire Matériaux Avancés et mise en forme



In just a few years, power electronics has become an essential technology that has spread throughout the world of electrical engineering. By 2030, nearly 80% of the electrical energy should pass through a stage controlled by power electronics. The current challenge of the developments is focused on increasing switching frequencies to improve converter efficiencies. Operating frequencies can now reach values above MHz and energy densities targeted will be 5 to 10 times larger than those of silicon-based components. Important issues exist since the analysis of a full converter shows that the non-optimized performance of passive components operating at very high switching velocities constitutes a so-called critical barrier. Significant efforts are required to develop passive magnetic components whose efficiency (low losses), high working switching frequency and sizing control (downscaling and thermal management) are optimized. Stereolithography (SLA) appears to be an interesting additive manufacturing technique to overcome the dimensional issues discussed here. This technology offers the possibility of designing complex parts. The main SLA bottleneck for ferrite concerns the interaction between "UV light and charged resin". Ferrite absorbs UV radiation and inhibits the photopolymerization reaction at high charge rate (>45%vol) that is the charge rate necessary to obtain a dense sintered material. A functionalization of the ferrite becomes necessary to obtain a crosslinkable resin.

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