Influence of particle size distribution on nanopowder cold compaction processes

Winter School on Continuous Media Mechanics

Boltachev, G.^1 ; Volkov, N.^1 ; Lukyashin, K.^1 ; Markov, V.^1 ; Chingina, E.^1

Institute of Electrophysics, Ural Branch of RAS, Amundsen St. 106, Ekaterinburg

620016, Russia^1

关键词: Bidisperse systems;    Cold compaction;    Compact density;    Dispersion force;    Granular dynamics;    Log-normal size distributions;    Particle diameters;    Polydisperse systems;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/208/1/012008/pdf
DOI  :  10.1088/1757-899X/208/1/012008

来源: IOP

【 摘 要 】

Nanopowder uniform and uniaxial cold compaction processes are simulated by 2D granular dynamics method. The interaction of particles in addition to wide-known contact laws involves the dispersion forces of attraction and possibility of interparticle solid bridges formation, which have a large importance for nanopowders. Different model systems are investigated: monosized systems with particle diameter of 10, 20 and 30 nm; bidisperse systems with different content of small (diameter is 10 nm) and large (30 nm) particles; polydisperse systems corresponding to the log-normal size distribution law with different width. Non-monotone dependence of compact density on powder content is revealed in bidisperse systems. The deviations of compact density in polydisperse systems from the density of corresponding monosized system are found to be minor, less than 1 per cent.