Effect of particle size distribution on technological properties of stainless steel powder

The role of fine particles on compaction and tensile strength of pharmaceutical powders

“…For relative densities below the RCP value, a significant rearrangement of particle positions occurs during the application of compaction pressure. In this regime, it is well known that the fine particles may adversely affect the ease of particle rearrangement [6,7,20]. Hence, the difference between the compaction pressure vs. relative density profiles during the initial die filling process and relative density of up to 0.6 for the different samples is due to the difference in the amount of fine particles of the samples.…”

“…The presence of fine particles between large particles changes the structure of particle assembly and the mechanical interaction between the particles. While the fine particles assist in forming a higher density, they adversely affect handling of powders [6,7,20]. Achieving higher densities and at the same time better handling of the powders with ease is desirable for high speed tablet manufacturing.…”

“…Among the physical properties, particle size distribution (PSD) is known to have a significant effect on the mechanical and kinematic properties of the powders. Some important effects of PSD include the efficiency of packing [1][2][3][4], mixing and segregation [5] and flow and handling [6,7] of powders. For powder compaction applications, the PSD may influence the mechanical strength [8][9][10][11][12][13][14][15][16][17] and drug release rate [18] of tablets.…”

Are Large Particles of Iron Detrimental to Properties of Powder Metallurgy Steels?

“…Sanchez et al [2] stated that AD diminishes when the particle size decreases due to the internal friction increase. Tikhonov et al [4] studied the effect of particle size distribution on properties of stainless-steel powders, they reported that with a rise in amounts of fine and medium fractions in powder mixtures, AD increased. They also stated that with adding fine powder to a coarse powder, the AD may either increase or decrease.…”

“…Peterson et al [5] observed that a flow rate of iron powders increased with rising a fraction of coarse particles. Tikhonov et al [4] stated that the flowability of a mixture of fine and coarse powders depended on packing particularities. In general, previous researches showed that the flow rate was enhanced by decreasing the particle shape irregularity [1,5].…”