| Название |
Kinetics of dispersion-agglomeration processes during mechanical activation of the charge
of 110G13 powder steel |
| Реферат |
An improved two-stage technology of mechanical activation of the powder charge of steel 110G13 in a ball planetary mill is investigated. At the fi rst stage, mechanical alloying of the powder charge containing iron and ferromanganese powders was carried out, followed by mixing with graphite powder. The influence of the duration of machining in a high-energy mill on the granulometric composition of the powder charge 110G13 was studied. The minimum values of the average particle size and the maximum fi ne fraction content (-63 μm) in the charge are observed with increased duration of mechanical doping (1,8 hours). Based on the results of the study of the kinetics of mechanical activation, a two-stage character of the dispersion-agglomeration processes of the powder charge particles containing ferromagnetic powder FeMn 88 (16.5 wt %), graphite GK-1 (1.1 wt %) and iron PIR 3.200.28 (1.8 hours), the dispersion of the charge is observed, and further increase in the processing time leads to its agglomeration Mechanical activation increases the content of the fraction of fine powder particles with the dimensions m Less than 63 μm in comparison with the mixing technology. The mass distribution over the fractions of the mechanically activated batch of 110G13 powder steel was described by the Rosin-Rammler equation. Kinetic sigmoidal dependences of the duration of activation on the parameters (α, β) of the Rosin-Rammler diff erential equation are proposed. Taking into account the established sigmoidal dependencies, the equation of the three-dimensional diff erential dependence of the particle size distribution is obtained, taking into account the time of mechanical activation of the powder charge 110G13. The degree of agglomeration of the 110G13 powder charge was estimated by an index equal to the ratio of the average particle sizes after treatment in the mill and subsequent treatment of the charge in the mortar. The formation of hard-to-break agglomerates during the mechanical activation of the powder charge 110G13 is established. |
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