The invention relates to a preparation method of flat-shaped high-
frequency wave-absorbing
magnetic powder. The preparation method comprises the following steps of, step 1, selecting materials, specifically, ferromagnetic
metal powder and ball milling
solvent, and selecting
organic solvent; and step 2, ball milling, specifically, selecting a wear-resistant ball as a ball milling medium, mixing theferromagnetic
metal powder with the ball milling
solvent, a dispersing agent and other auxiliaries in a planetary
ball mill, wherein the ball material ratio is 10:1-20:1, the
mass percent of dosage of the dispersing agent and other auxiliaries of the ferromagnetic
metal powder is less than or equal to 1%, and then carrying out ball milling for 2-6 h under the condition that the rotating speed ofthe planetary
ball mill is greater than or equal to 400 r / min, carrying out preliminary flattening of the ferromagnetic
metal powder, adjusting the rotating speed of the planetary
ball mill to less than 200 r / min, reducing the
impact force of the ball milling medium on the flat powder, reducing the breaking rate of the ferromagnetic
metal powder, continuing the ball milling for 1-8 h, and carryingout discharging and
drying so as to perform annealing treatment at 500-800 DEG C under the protection of
reducing atmosphere of
argon,
hydrogen and
nitrogen for eliminating stress. According to the preparation method, the flattening rate can be improved, the flattening time can be saved, and the performance of the
magnetic powder can be improved.