Développement de verres phosphates à basse température de transition vitreuse pour l'impression 3D et ses applications

Additive manufacturing, also known as 3D printing, refers to a set of manufacturing techniques by adding matter, as opposed to the more 'traditional' subtractive methods, such as machining. There are a lot of very different additive manufacturing processes, as well as a diversity of printable materials, including metals, ceramics and polymers. However, very few solutions have been developed so far for the printing of glass. The main obstacles are the very high processing temperatures required.The main objective of this thesis is to enable the additive manufacturing of phosphate glasses. These glasses are advantageous for their lower working temperatures and are also known for their applications in optics and biomaterials. To that purpose, convenient phosphate glass compositions with low glass transition temperatures were developed. The first system studied was (50 - x) P2O5 – 25 Na2O – 25 K2O – x M2O3 (%mol), with M = Al ou Ga and x between 0 and 10 %mol. The most ideal composition studied in the system was then successfully printed following a fused deposition modeling process, using a modified commercial polymer 3D printer. To obtain printed glass objects that are transparent, printing parameters were finely tuned to avoid potential defects. The residual porosity of printed glass objects is estimated to be lower than 0.02 %. Being able to print phosphate glasses with this process enables the fabrication of optical parts with complex geometries and unique properties.Transparent hydrated phosphate glasses were also studied. These materials exhibit a glass transition temperature below 100 °C and could be synthetized at temperatures as low as 300 °C. The structure of these new materials was then investigated, using Raman, infrared and NMR spectroscopies. -OH groups were found within the phosphate network, where they act as network modifiers, causing the modification of the glass' properties. By adding zinc oxide to the glass composition, it is possible to make the hydrated phosphate glasses more resistant to dissolution while keeping their transparency and their low glass transition temperature. These materials enable new functionalization possibilities, some of which were studied. For instance, glass-polymer composite fibers were made, and tungsten trioxide functional nanoparticles were integrated in a hydrated phosphate glass matrix.

Récupéré en direct depuis OpenAlex et désinversé. Les résumés ne sont pas conservés dans cette base de données : les index inversés représentent 8,6 Go des 9,3 Go de texte de la base, et le serveur dispose de 13 Go libres.