Question

2.4. Iron powder is screened into -100/+200 mesh and -325 mesh fractions. The apparent density of the coarse fraction is 2.6 g/cm and the fine fraction has an apparent density of 2.3 g/cm. When a blend is prepared using 20% fine particles in the coarse fraction, the apparent density is measured as 2.8 g/cm. Explain the effect.

Answer 1

Iron powder is screened into - 100/ + 200 Mesh = -325 Co fraction = 2 - 6 g/cm^3 density measured = 2.8g/cm^3 Apparent density of a metal power is one of the fundamental property powder This characteristic defines the actual volume occupied by a mess of loose powder Factors affecting Apparent density: Apparent density of powder is affected by particle size it generally decreases with particle size decrease the particle shape becomes less more irregular decreasing with increasing surface roughness frequently controlled by moving various size of particles as per given parameter powder is having apparent density 2 - 6 fire powder is having apparent density This effect is explained finally with the concept of particle size distribution \r\n As effective way to increases the apparent density of a powder is to fill the spaces between particle with similar particles The addition of fire spherical powder effectively increase the apparent density.