System-level Integration of Transient-State Engineering and Sintering-Induced Microfeature Scaling for Microstructured Metallic Inserts
ProgettoSINTESI addresses a manufacturing bottleneck that limits the transition of Lab-on-Chip (LoC) and microfluidic concepts from one-off prototypes toreplication-relevant pre-series. Micro injection moulding (μIM) is scalable, but tool-centred and poorly flexible during early design iterations; additive rapidtooling improves mould reconfigurability, yet resin inserts have shown insufficient robustness under repeated moulding loads. SINTESI turns this limitationinto a scientific model challenge: can the green state generated by pellet-based metal material extrusion (P-MEX/M) be engineered as a temporary,machinable state, and can sintering shrinkage be leveraged to transform dimensional deviation into a predictable mechanism for metallic microfeaturedownscaling?
LoC-oriented, microstructured metallic insert model systems are used not to qualify an industrial tooling route, but rather as severe benchmark geometriesthat link microchannel accuracy, edge stability, surface quality, shrinkage traceability, material integrity, and replication fidelity. They test whether futurereconfigurable metallic tooling concepts could support larger and more consistent batches of polymer microdevice prototypes under conditions closer toindustrial replication. Baseline features will be defined in the 200–250 μm width range with 50–100 μm depth, while a high-resolution subset will target the100–150 μm scale to quantify how green-state micromachining and predictable sintering shrinkage can be combined to obtain stable, downscaled metallicmicrofeatures.
SINTESI will define benchmark features and system-level descriptors; classify P-MEX/M green states by stability, cohesion, anisotropy, porosity-relatedstructure and machinability; perform damage-controlled green-state micromachining of channels, ribs, edges and diagnostic features; analysedebinding/sintering response, local shrinkage, feature survival, density, residual porosity, surface/edge stability and material integrity; and validate theprocess maps through conservative μIM-oriented LoC replication. CNR will coordinate the scientific trajectory and model-system validation; POLIMI willformalise the process-chain model and Stream-of-Variation descriptors; UNIBS will develop green-state engineering and micromachining; POLIBA will closethe loop through thermal-processing interpretation and material-integrity assessment.
The expected outcome is a transferable framework linking process history, transient material-state descriptors, green-state machinability, damagethresholds, microfeature scaling and replication-oriented validation. By establishing process maps and design rules for the controlled use of pre-sinteredmaterial states, SINTESI will advance hybrid micromanufacturing and provide a scientific basis for scalable, reconfigurable microfluidic manufacturingplatforms.
LoC-oriented, microstructured metallic insert model systems are used not to qualify an industrial tooling route, but rather as severe benchmark geometriesthat link microchannel accuracy, edge stability, surface quality, shrinkage traceability, material integrity, and replication fidelity. They test whether futurereconfigurable metallic tooling concepts could support larger and more consistent batches of polymer microdevice prototypes under conditions closer toindustrial replication. Baseline features will be defined in the 200–250 μm width range with 50–100 μm depth, while a high-resolution subset will target the100–150 μm scale to quantify how green-state micromachining and predictable sintering shrinkage can be combined to obtain stable, downscaled metallicmicrofeatures.
SINTESI will define benchmark features and system-level descriptors; classify P-MEX/M green states by stability, cohesion, anisotropy, porosity-relatedstructure and machinability; perform damage-controlled green-state micromachining of channels, ribs, edges and diagnostic features; analysedebinding/sintering response, local shrinkage, feature survival, density, residual porosity, surface/edge stability and material integrity; and validate theprocess maps through conservative μIM-oriented LoC replication. CNR will coordinate the scientific trajectory and model-system validation; POLIMI willformalise the process-chain model and Stream-of-Variation descriptors; UNIBS will develop green-state engineering and micromachining; POLIBA will closethe loop through thermal-processing interpretation and material-integrity assessment.
The expected outcome is a transferable framework linking process history, transient material-state descriptors, green-state machinability, damagethresholds, microfeature scaling and replication-oriented validation. By establishing process maps and design rules for the controlled use of pre-sinteredmaterial states, SINTESI will advance hybrid micromanufacturing and provide a scientific basis for scalable, reconfigurable microfluidic manufacturingplatforms.