Iron powder, an aggregate of iron particles with a size less than 1 mm. Color: black. Water atomized pure iron powder is the primary raw material for powder metallurgy. According to the particle size, it is customarily divided into five grades of coarse powder, medium powder, fine powder, fine powder and ultrafine powder. Iron powder with a particle size in the range of 150 to 500 μm is coarse powder, particle size is 44 to 150 μm is medium powder, 10 to 44 μm is fine powder, 0.5 to 10 μm is ultra fine powder, and less than 0.5 μm is ultra fine. powder.

Generally, the powder that can pass through the 325 mesh standard sieve, that is, the particle size is less than 44μm, is called sub-sieve powder. For more high-precision sieving, only air classification equipment can be used. The nitrogen maintenance classifier does it. Iron powder mainly includes restored iron powder and atomized iron powder, which are named for different production methods. Iron powder Pure metallic iron is silver-white and iron powder is black. This is an optical problem because the specific surface area of the iron powder is small and there is no fixed shape.

The crystal structure of the iron block has a few shapes, so the iron block absorbs part of the visible light, and reflects the other part of the visible light specularly, showing white; the light that is not absorbed by the iron powder is diffusely reflected, and there is less visible light that can enter the human eye. So it's black. The use of iron powder is one of the most important metal powders in the powder metallurgy industry. The amount of iron powder used in powder metallurgy production accounts for about 85% of the total consumption of metal powder. The primary market for iron powder is the manufacture of mechanical parts, which requires about 80% of the total output of iron powder.