Iron powder is an aggregate of iron particles with sizes of
approximately 20-200 μ m. It is treated as a powder using the particle size distribution,
apparent density, etc. as indexes. Its properties differ depending on the production
method and history.
Commercial iron powders are classified in three types, reduced iron powder, atomized iron powder, and electrolytic iron powder, depending on the production method, and are used in various applications, taking advantage of their respective properties.
The following images show the appearance and cross-sectional microstructure of single particles of a representative reduced iron powder and atomized iron powder. Although there is little difference in the external appearance of the two types, the cross sections differ greatly.