METHOD FOR MAKING ARTICLES OF MAGNETIC MATERIALS Russian patent published in 2003 - IPC

FIELD: powder metallurgy, possibly manufacture of magnetic circuits of electric devices, instruments and machines operating in variable fields. SUBSTANCE: method comprises steps of loading powder mixture into electrically conductive envelope; molding mixture with use of energy of pulse magnetic field; removing envelope from article and sintering article; at first creating constant magnetic field with intensity (0,7-0,9)×10⁶ A/M for 1 - 3 s; then relieving field and acting by discharge energy of capacitor unit equal to 140 - 160 kJ at pulse duration no more than 4×10^-5 s upon inductor for preliminarily molding mixture; creating constant magnetic field with intensity (1,5-1,9)×10⁶ A/M for 3 - 6 s; relieving said field and acting by discharge energy of capacitor unit equal to 290 - 340 kJ at pulse duration no more than 7×10^-5 s upon inductor for finally molding compact; creating magnetic field with intensity (1,1-1,4)×10⁶A/M for 2 - 4 s; relieving it and acting by discharge energy of capacitor unit equal to 180 - 210 kJ at pulse duration no more than 5×10^-5 s upon inductor for calibrating compact; removing envelope from compact and sintering it in vacuum 0.065 Pa at temperature 1750 K at least for 2140 s. EFFECT: lowered electric losses, enhanced permeability. 1 tbl