Additive Manufacturing (AM) is an emerging part production technology that offers many advantages such as high degree of customization, material savings and design of 3D highly complex structures. However, AM is a complex multiphysics process. Therefore, only a limited number of materials can already be commercially used to produce parts and a handful of others are being studied or developed for such process. Consequently, limited knowledge on this process is available, especially concerning materials that present thermomechanical challenges such as brittle materials.
The research I did during my PhD studies focuses on additive fabrication of silicon pillars on a monocrystalline silicon wafer by Direct Laser Melting (DLM) with a pulsed 1064 nm laser beam. The simple geometry of pillars allowed for the first determining steps into process understanding. Several results were achieved through this PhD work. First, crack-free silicon pillars were successfully built onto monocrystalline silicon wafers. With the help of in-situ process monitoring and sample characterization, wafer substrate temperature and laser repetition rate were found to be the main influential parameters to obtain crack-free samples, as minimum substrate temperature of 730°C and a minimum repetition rate of 100 Hz were necessary to reach this goal (for a feed rate of 15 g/min and a pulse duration of 1 ms). The influence of secondary process parameters such as feed rate and energy per pulse were also discussed. A simple Finite Element Modeling (FEM) model validated by the experiments was used to explain crack propagation in the samples. Then, process monitoring of the DLM process was realized. High-speed camera image analysis re-vealed that vertical stage speed and powder feed rate should match to obtain a constant pillar building rate. As all pillars presented necking at their base, estimations of the thermal characteristics of the pillar during growth were carried out by FEM simulations. They were additionally used to explain the pillar final shape. Finally, the microstructure of the pillars built was characterized by the Electron Back-Scattering Dif-fraction (EBSD) technique. In the conditions presented in this work, the microstructure of the pillar was found to be in the columnar growth mode. The feed rate was identified as the most influential parameter on the microstructure, followed by the stage speed, the impurity content of the powder and the crystallographic orientation of the substrate. Epitaxial growth was achieved on more than 1 mm with a feed rate of 1.0 g/min, a stage speed of 0.1 mm/s, a powder with purity of 4N and a <111> oriented wafer substrate. This work could be further continued by making improvements to the DLM setup, studying the influence of additional process parameters on the thermomechanical behavior and the microstructure control of the pillars, and/or using these results to realize more complicated shapes, either with this setup or by using a powder bed technique.
About
I was born in France and I have grown up in a little town called Beynes, in the department Yvelines, no so far from Paris and Versailles. I am the first of four kids! As a child, I wanted to be a journalist. I have always been interested in digging up into a subject in order to transforming into articles that could be read by others. I had a few friends writing a bunch of articles alongside so we could turn everything into magazines. I spent a lot of time playing with a - now old - layout software in order to make this publication look like my favorite magazines at that time – L’Hebdo, le monde des ados. I even managed to get an internship for a week there!
About
I was born in France and I have grown up in a little town called Beynes, in the department Yvelines, no so far from Paris and Versailles. I am the first of four kids! As a child, I wanted to be a journalist. I have always been interested in digging up into a subject in order to transforming into articles that could be read by others. I had a few friends writing a bunch of articles alongside so we could turn everything into magazines. I spent a lot of time playing with a - now old - layout software in order to make this publication look like my favorite magazines at that time – L’Hebdo, le monde des ados. I even managed to get an internship for a week there!
Marie Le Dantec
Communication Scientifique et Communication Visuelle
Adresse
Gundeldingerstrasse 125
4053 Basel
Switzerland
Social Media
Instagram: @mld_visuals
LinkedIn: Marie Le Dantec
Languages
Français (langue maternelle), Anglais (bilingue), Allemand (langue de travail), Espagnol (A2), Italien (A2).
À propos de moi
Je suis médiatrice scientifique et designer en communication visuelle, avec un vif intérêt pour la recherche et la gestion de projets innovants, en particulier dans la manière de partager et d’enseigner des sujets complexes comme les sciences à des publics non-avertis.
Je suis particulièrement attirée par les projets multidisciplinaires, et j’ai eu l’opportunité de travailler à l’interface entre le design, les sciences naturelles et les sciences sociales.
Curieuse de nature, j’utilise l’illustration comme un outil pour susciter l’émerveillement, la réflexion et la connexion avec le sujet développé. Je travaille principalement à l’aquarelle et à l’encre, mais j’aime aussi expérimenter avec le dessin numérique et d’autres techniques. Les projets qui explorent les sciences, l’écologie, l’éducation, les enjeux sociaux et les arts sont ceux dans lesquels je me sens le plus à ma place.
Expérience professionnelle
Février 2019 - Juin 2021
Octobre 2013 - Août 2018
Septembre 2017 - Janvier 2019
Septembre 2010 - Août 2013
J'étudie la communication visuelle (Master of Arts in Design) à la Haute Ecole de Design de Zürich (ZHdK), Suisse. Je travaille principalement sur le développement de stratégie visuelles et de storytelling pour communiquer efficacement sur le système de la protection de l'enfance à des publics non-avertis.
J'effectue ma thèse en science des matériaux / photonique à l'Ecole Polytechnique Fédérale de Lausanne (EPFL) et à l'Institut pour la Science des Matériaux (EMPA), Suisse. Je me spécialise en science des matériaux, notamment l'impression 3D des matériaux fragiles tels que le silicium.
Je suis des cours du soir en communication visuelle à l'Ecole de Design Bern & Bienne, en Suisse. J'apprends à dessiner, peindre à utiliser la suite Adobe.
J'obtiens mon diplôme d'ingénieur (Master Nanotech) en micro et nanotechnologies pour les systèmes intégrés à Phelma - Grenoble INP (France), Politecnico di Torino (Italie) et EPFL Lausanne (Suisse). Je fais ma thèse de Master dans la start-up Plus Mat AG qui recycle le silicium en poudre perdu lors de la découpe des wafers de silicium.
Expérience professionnelle
Août 2022 - Aujourd'hui
2019 - 2024
J'occupe le poste de "Responsable de la Communication et de la Médiation Scientifique" au NCCR SPIN, Université de Bâle, Suisse, un consortium de laboratoires de recherche focalisé sur le développement de spin qubits, les blocs de base des ordinateurs quantiques.
- Je développe et manage des projets de médiation scientifique
- J'organise des évènements et des conférences
- Je manage les communications internes et externes
- Je m'occupe de la coordination du pôle "Equal Opprtunities"
Je développe mon entreprise en freelance, qui s'appelle MLD Illustration. Je propose en commission des services de communication créative et de développement de projets (illustration, livres, design textile). En particulier, je prends la direction artistique et je co-développe et illustre une série de livres pour les enfants placés en foyer d'accueil avec l'association Particp'Action (2019-2021).
Février 2019 - Novembre 2020
Je travaille comme designeur graphique chez 3dprojekt.ch (maintenant Werbit) à Pfäffikon SZ, Suisse. Je produis des concepts graphiques, et matériel de marketing pour des projets immobiliers.
Mes réseaux
sociaux
