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Iron powder, an aggregate of iron particles smaller than 1 mm in size. Colour: Black. Is the main 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 extremely fine powder, and less than 0.5 μm is ultra fine. powder. Pre-alloyed iron powder is generally referred to as a sub-sieve powder that can pass a 325 mesh standard sieve, that is, the particle size is less than 44 μm. For more high-precision sieving, only air classification equipment can be used, but for some easily oxidized iron powder Only use JZDF nitrogen protection classifier. Iron powder mainly includes reduced iron powder and atomized iron powder, which are named because of different production methods.
Pure metallic iron is silver-white, and iron powder is black. This is an optical problem, because the specific surface area of iron powder is small and there is no fixed geometry, and the crystal structure of the iron block is geometric, so the iron block absorbs some visible light. , The other part of the visible light specularly reflected, showing white; the light that was not absorbed by the iron powder was diffusely reflected, and there was less visible light that could enter the human eye, so it was black.
Application of iron powder
One of the most important metal powders in the powder metallurgy industry. Iron powder is used in a large amount in powder metallurgy production, and its consumption accounts for about 85% of the total consumption of metal powder. The main market for iron powder is the manufacture of mechanical parts, which requires about 80% of the total output of iron powder.