MANUFACTURE OF NEEDLEELIKE HIGHLY MAGNETIC IRON PARTICLE

摘要

A process for the manufacture of acicular ferromagnetic iron particles by reducing an iron(III) oxide which carries a shape-stabilizing surface coating and has been produced by heating acicular iron(III) oxide hydroxide at 250 DEG -390 DEG C. in an atmosphere containing water vapor at a partial pressure of not less than 30 mbar, with hydrogen at 275 DEG -425 DEG C.