Laser powder bed fusion applied to the manufacture of bulk or structured magnetic cores

Rings based on pure iron have been manufactured by laser powder bed fusion. Different experimental conditions implemented to manufacture simple rings called “bulk”. Selected were used fabricate “structured” rings, made up of stacking lamellae separated weakly densified metal zones or spacers. The magnetic properties these measured in order determine their maximum flux density, permeability and losses. These properties, as well the organizations domains observed Magnetic Force Microscopy, compared with those obtained for machined from castings parts spark plasma sintered parts. “bulk” resulting fusion exhibit relatively high losses 80 W.kg−1 at 50 Hz under 1 T. However, this value can be lowered about 30 after a SPS treatment 750 °C. In addition lowering losses, annealing increases densification material thus flux. spacing dense less spacers (“structured rings”), makes it possible also greatly reduce Dividing factor 2 is implementing geometric arrangement.