Structural study of iron-based microstructured and nanostructured powders sprayed by HVOF thermal spraying

The paper deals with the structure and magnetic properties of coatings obtained by HVOF spraying using microcrystalline and nanocrystalline powders. Nb coatings sprayed using microcrystalline powders, X-ray diffraction showed partially amorphous structure. For FeSi ones, the structure was completely crystalline. Si coatings sprayed using nanocrystalline powders, X-ray diffraction showed the crystalline size was lower than that in the coating obtained from microcrystalline powder. For FeSiB alloys, the structure is crystalline with a small quantity of amorphous phase. FeSi coatings behaved as a soft ferromagnetic. On other hand, the FeSiB coatings presented.