MATERIAL

Polvere NiTi

The metal powder used for stent fabrication consists of Nickel–Titanium (NiTi) alloy produced by gas atomization under a controlled atmosphere, a technology that ensures high particle sphericity and an optimal particle size distribution for Additive Manufacturing processes. The chemical composition is 50.8 at% Ni, with a particle size distribution characterized by a D90 value of 53 μm, suitable for the Powder Bed Fusion process. The impurity level is low and compliant with standards for biomedical applications, with carbon content of 351 ppm and oxygen content of 241 ppm. The thermo-mechanical properties of the alloy are confirmed by the martensitic transformation temperatures, with an Af value of –1 °C, ensuring appropriate superelastic behavior under endovascular operating conditions.