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Vincent Guipont

Vincent Guipont

Research Director

Center · CMAT

Discipline(s)
Process Engineering, Solid Mechanics
Topic(s)
Additive Manufacturing, Biomaterials, Superalloy

Keywords

Team

GEM - Genèse, Évolution des Microstructures

Biography

Vincent Guipont is a researcher specializing in the study of coatings and interfaces, with a strong expertise in thermal spray deposition processes and the degradation mechanisms of materials under thermomechanical stresses. His work primarily focuses on ceramic and metallic coatings, including thermal barrier coatings (TBCs) used in aeronautical turbines and energy systems. He investigates interfacial damage phenomena such as delamination, cracking, and stress corrosion under thermal conditions, combining innovative experimental approaches (such as the Laser Adhesion Test, LASAT) with finite element numerical modeling. His research also addresses emerging processes like cold spray for depositing ceramics and composites, studying the influence of spray parameters on the microstructure and mechanical properties of coatings. A significant part of his work involves analyzing the interactions between microstructural defects (porosity, inclusions) and material performance under real-world operating conditions.

Publication(s)

Teaching

Implantable Devices and Materials for Medical Use

Guest Lecturer

Syllabus The numerous and extremely varied concepts covered in this course will be illustrated by the teaching team using one or two real-life cases involving organs or tissues (dental, osteoarticular, cardiovascular, etc.) to serve as “guiding themes” throughout the course. During the first session, students will take on the role of an R&D team tasked with developing a material for a healthcare application. They will thus choose their own “guiding theme,” to which they will apply the various concepts covered from one class to the next. Each class session will be organized into three phases: - I - a presentation followed by a discussion during which a pair or trio of students will present how the material from the previous class applies to their project; - II - an introductory lecture on fundamental concepts or a presentation by a guest speaker (a physician, industry representative, or regulatory specialist); - III - a group work session to apply the concepts covered to the selected case study. Furthermore, once the case study has been selected, the teaching team will work with the students to contact one or more specialists in the field (physician, researcher, engineer, etc.), to whom a summary of the study will be presented at the end of the course in the form of a report and a project defense presentation. Students will thus be able to test their approach against the critical opinions of experts and professionals. Content The program will consist of six sessions during which the following concepts will be covered: • the composition and organization of biological materials, • biocompatibility, bioactivity, biointegration, and bioresorbability, • the mechanical properties of tissues and their mechanical characterization in vivo and in vitro, • the major classes of biomaterials (polymers, metals, ceramics), • new manufacturing processes and the tissue engineering approach, • methods for evaluating the in-service performance of biomaterials and medical devices, • regulatory aspects, • consideration of medical constraints, • the industrial context.

Metal 3D Printing

Guest Lecturer

The curriculum for the course days is as follows: General introduction to additive manufacturing processes; overview of the phenomena involved in LBM and ColdSpray processes; thermodynamics; phase transformation during rapid solidification; associated microstructural evolution; mechanical behavior and properties of parts produced by additive manufacturing processes; post-processing; defect mitigation. LBM and ColdSpray fabrication techniques, construction steps, overview of experimental characterization methodologies related to additive manufacturing processes and defect analysis, measurement of residual stresses using X-ray diffraction (XRD). Numerical modeling of additive manufacturing processes; objectives of simulation tool development; physical phenomena monitored; resolution scales; prediction of final properties. Presentation (by an industry R&D engineer) on the use of additive manufacturing processes in an industrial context, the objectives pursued, and the expected results. In addition to these lectures, a project component will also be included in the course, lasting 6 hours, at the Materials Center (CMAT, Evry), requiring students to travel to this laboratory for two full days. During these two days, on the first morning, students will attend the lecture on fabrication and characterization techniques associated with additive manufacturing processes (Session V—3 hours in the morning on Day 1). The subsequent training period (3 hours in the afternoon on Day 1 + 3 hours in the morning on Day 2) will be dedicated to carrying out the supervised projects. Independent work (3 hours in the afternoon on Day 2) may be conducted at the CMAT to allow for the review and analysis of the results, in preparation for the evaluation session. Project selections will be made no later than during the first lecture session.

Materials Science and Engineering (SGM) option

Guest Lecturer

The Second Year: Discover, Observe, Experiment The two-week elective period is devoted to a mini-project in pairs, in one of the School’s two laboratories (the Materials Center in Evry or the Materials Processing Center in Sophia-Antipolis, with more than 70 faculty members supporting the elective). The topics revolve around a specific industrial project. The focus is on discovering physical, chemical, and mechanical phenomena—and on quantifying them. A detailed report and an oral presentation allow students not only to develop communication skills but, above all, to learn from one another. Some topics include: investigation of a railway brake failure, investigation of non-conformity in metal seals, welding (instrumented testing and numerical modeling), study of foam formation mechanisms for automotive seats, aerogel formation for super-insulation or biomedical applications... The 3rd Year: Understanding, Making Choices, Optimizing The two highlights of the third year are the elective month (starting at the beginning of the academic year) and the personal project, which takes up the rest of the time dedicated to the elective. The elective month: “Materials and Engineers” in a specific industrial sector. The elective month is devoted to materials engineering and focuses on a specific industrial sector (2004 and 2005: the automotive industry; 2006 and 2007: aerospace; 2008 and 2009: construction; 2010 and 2011: energy; 2012 and 2013: healthcare; 2014 and 2015: aerospace). The wide range of activities fosters hands-on learning and helps build a cohesive group, enriched by the diverse backgrounds and personalities of both students and teachers: industrial tours: the development, processing, and use of materials in the chosen field; a few lectures given by industry experts; “Industrial Discovery” mini-projects: 5 days in groups of 2 to 4 students at an industrial site, supervised by on-site engineers, working on an engineering problem; a written report (for internal company use) and an oral presentation allow the different groups to share the knowledge and experiences gained in the field; a few “classes”—which are actually preparatory sessions for the visits and “debriefing” sessions in the form of Q&A sessions with faculty regarding the lectures and industrial visits. The elective project: applying methods and knowledge to solve an industrial problem. These individual elective projects form the backbone of the third year. Defined as early as October, in accordance with each student’s preferences, they focus on a clearly identified industrial problem. Lasting at least 4 months (a total of 8 months for Polytech students in the “specialized track”), they take place at an industrial site under dual supervision: engineers from the company on one hand, and a faculty researcher from one of the School’s two “Materials” laboratories on the other. The emphasis is on understanding the underlying phenomena and solving the practical problem at hand. Some representative elective topics covered in recent years: selection of a material for a Formula 1 racing car component (Renault, Viry-Châtillon); modeling of thin films deposited on glass (Saint-Gobain, Thourotte); selection and sizing of a shock-absorbing foam (SNCF, Le Mans); feasibility of coating pistons via plasma spraying (Toyota, Evry—Belgium – Japan); an innovative steel continuous casting process (Vallourec, Aulnoye-Aymeries / Brazil); optimization of the fiber-reinforced polymer injection molding process (Bosch, Germany); analysis of medieval gilded enameled glass (Laboratory of the Museums of France, Paris); prediction of fracture properties of steels for gas pipelines (ArcelorMittal, Ghent, Belgium). acceptance criteria for forging defects (PSA, La Garenne-Colombes); painting defects on automotive plastic body parts (Mécaplast, Monaco) welding of superalloy parts for space launch vehicles (Snecma, Vernon) improvement of non-destructive testing of power plant components (EDF, Saint-Denis) decontamination of concrete used in civil engineering for nuclear power plants (Bouygues, St-Quentin / CEA, Marcoule) Improving the manufacturing of composite parts for the aerospace industry (Dassault, Argenteuil) Material selection for endoscopic probes with integrated microscopes (Mauna Kea Technologies, Paris) Key features of the track: Hands-on experience! The track includes very few courses in the traditional sense: knowledge and skills are acquired through courses offered to all students (core curriculum, specialized courses) and, above all, by sharing each student’s real-world experiences. It’s about experimenting on your own and as part of a team (with dual mentoring by an industrial engineer and a faculty researcher). Intensive group work The diversity and number of students in the track allow everyone to learn from and with one another. This provides effective training in self-directed learning methods that engineers will use throughout their careers to remain key players in their fields of expertise and take control of their professional development. Interdisciplinary Approach The field of materials lies at the intersection of disciplines such as physics, chemistry, mechanics, applied mathematics, and numerical modeling. Elective projects often include both an experimental component and a modeling component, providing a well-rounded education in materials science. The track covers ceramics, “plastics,” metals, and alloys, as well as ancient artifacts (archaeology) and the latest innovations (“biological” steels, bio-based and non-bio-based aerogels, etc.).

PhD supervision

  • 2024 High-temperature damage to thermal barriers: effects of the environment studied by laser shock. DEGOUILLES Eliott
  • 2024 Thermomechanical fatigue sizing of next-generation thermal barrier coatings COLOMBEL Paul
  • 2022 Development of the L-PBF process with preheating for the manufacture of unweldable nickel-based superalloys. ASSAINTE Matthieu
  • 2021 Mastery of additive manufacturing of SS316L parts by Metal Binder Jetting (MBJ) for large-scale applications CHENY Thomas
  • 2021 Inconel 718 parts manufacturing by Metal Binder Jetting: from printing to sintering through debinding to ensure material integrity and part dimensions SCHNELL Agnès
  • 2020 Cold spray projection of ceramics: influence of the architecture of agglomerated powders on impact behavior and deposit formation CÉLESTE Geoffrey
  • 2019 Effect of oxide inclusion presence on the prediction of stress corrosion cracking initiation in Alloy 600 in PWR environment PEREZ Colette
  • 2019 Mastery of the microstructure of a nickel-based superalloy (Inconel 718) produced by the L-PBF process LACOSTE Luc
  • 2019 The evolution of the AM1/(Ni,Pt)Al/YPSZ thermal barrier system under thermo-mechanical fatigue conditions MAHFOUZ Lara
  • 2018 Study of nickel-based coatings for the chaining of Cold Spray and L-PBF (Laser-Powder Bed Fusion) processes PLOUZE Cléa
  • 2017 In-situ detection by infrared thermography of manufacturing defects in Laser-Powder Bed Fusion (L-PBF) for closed-loop process control: applications to TA6V and 15-5PH alloys FOSSE Bastien
  • 2017 Study of the Laser Shock Adhesion Test (LASAT) on plasma-sprayed hydroxyapatite coatings: influence of edge effects on interface stresses and cracking COTTIN Alexandre
  • 2017 Selective laser melting of Inconel 738 and René 77 parts: towards controlling cracking during the process for high γ' fraction superalloys GRANGE David