The influence of the particle size on rheological properties of magneto fluidized bed of strontium hexaferrite

\nPowder metallurgy processes are in general less polluting and more sustainable than the traditional mechanical manufacturing. In order to organize technological processes with the ferromagnetic powders, one usually applies special methods to change the coefficient of inner friction of particulate systems. We studied the regimes of the magnetic fields that form magneto fluidized bed from the strontium hexaferrite (SrFe12O19) powder and provide the decrease of the inner friction coefficient. The magneto fluidized bed was formed by the effect of the crossed constant and alternating gradient magnetic fields. The results of electromagnetic parameters influence on rheological properties of the magneto fluidized bed formed from strontium hexaferrite powders with various average particle sizes are presented in the paper. The dependencies of the strontium hexaferrite stimulated fluidity speed through a 2 mm diameter hole from the electromagnetic field parameters were studied. The obtained results show the possibility of using dry ferromagnetic powders in the permanent magnets production in powder metallurgy.\n