Development and characterization of polymer- metallic powder feedstocks for micro-injection molding
type: Dataset
description: Micro-Powder Injection Moulding (Micro-PIM) technology is one of the key technologies that permit to fit with the increasing demands for smaller parts associated to miniaturization and functionalization in different application fields. The thesis focuses first on the elaboration and characterization of polymer-powder mixtures based on 316L stainless steel powders, and then on the identification of physical and material parameters related to the sintering stage and to the numerical simulations of the sintering process. Mixtures formulation with new binder systems based on different polymeric components have been developed for 316L stainless steel powders (5 µm and 16 µm). The characterization of the resulting mixtures for each group is carried out using mixing torque tests and viscosity tests. The mixture associated to the formulation comprising polypropylene + paraffin wax + stearic acid is well adapted for both powders and has been retained in the subsequent tests, due to the low value of the mixing torque and shear viscosity. The critical powder volume loading with 316L stainless steel powder (5 µm) according to the retained formulation has been established to 68% using four different methods. Micro mono-material injection (with 316L stainless steel mélange) and bi-material injection (with 316L stainless steel mélange and Cu mélange) are properly investigated. Homogeneity tests are observed for mixtures before and after injection. A physical model well suited for sintering stage is proposed for the simulation of sintering stage. The identification of physical parameters associated to proposed model are defined from the sintering stages in considering 316L stainless steel (5 µm)mixtures with various powder volume loadings (62%, 64% and 66%). Beam-bending tests and free sintering tests and thermo-Mechanical-Analyses (TMA) have also investigated. Three sintering stages corresponding to heating rates at 5 °C/min, 10 °C/min and 15 °C/min are used during both beam-bendi…
identifier: NNT: 2011BESA2029
issued: 2026-05-10T08:32:59.633572
language: en
modified: 2026-05-10T08:32:59.633576
contact point: Organization
  fn: CCSD
keyword: acier-inoxydable
keyword: densification
keyword: infoeu-reposemanticsdoctoralthesis
keyword: injection
keyword: material-modeling
keyword: micro-composants
keyword: micro-metal-injection-molding
keyword: micro-moulage
keyword: modelisation
keyword: multi-material-injection-sintering
keyword: numerical-simulation
keyword: simulation-numerique
keyword: spiotherengineering-sciences-physicsother
keyword: stainless-steel
keyword: theses
landing page: https://theses.hal.science/tel-00844736

Development and characterization of polymer- metallic powder feedstocks for micro-injection molding
type: Distribution
format: HTML
issued: 2026-05-10T08:32:59.636619
modified: 2026-05-10T08:32:59.605346
access URL: https://theses.hal.science/tel-00844736

test_moissonnage_selune
type: Agent