Metallic filter with microstructured architecture of controlled porosity and process for manufacturing such a filter

A method of additive manufacturing of a metallic filter, said method of additive manufacturing comprising the following steps:

• depositing at least one layer of metallic powder of a given material or of a given alloy of materials on a support, said layer of metallic powder having a thickness of between 1 μm and 200 μm;
• performing localised laser melting of the metal grains of the powder, at a temperature higher than the melting temperature of the given material or of the given alloy of materials forming said metallic powder deposited in the deposition step and running a computer program to create a predetermined pattern of a microstructured architecture defined in a three-dimensional space having orthogonal axes, the microstructured architecture comprising:
• a metallic network formed of a plurality of longitudinal connecting strands, extending along a longitudinal axis direction, and
• a network of pores formed of a plurality of longitudinal interstices along connecting strands, each longitudinal interstice corresponding to a subset of pores of the network of pores, the subset of pores having the pores aligned along the longitudinal axis,
• the longitudinal interstices defining an axis of anisotropy of the microstructured architecture.