COMPOSITE MATERIAL FOR PERMANENT MAGNETS (ALTERNATIVES) Russian patent published in 2001 - IPC

FIELD: magnetic materials for magnetic parts of electric motors, water gages, acoustic and television equipment, and the like. SUBSTANCE: composite material (and its alternatives) using polypropylene base binder has polypropylene and magnetic filler. Novelty is that it incorporates polypropylene powder finely dispersed to below 125 mc with ultimate volatility value of 4-12 g per 10 min and that either powdered Nd-Fe-B alloy, grade BZMP-2, or mentioned powdered alloy, grade BZMP-2 and BZMP-3, in combination with powdered ferrite BA or Sr is used as magnetic filler. Degree of Nd-Fe-B powder dispersion is not over 100 mc. Composite material has, in addition, dibutyl phthalate (0.003-0.005 parts by volume) and phenosane-28 (0.005-0.007 parts by volume). Amount of powdered Nd-Fe,B alloy in material is 0.35 to 0.665 parts by volume, that of powdered ferrite, 0.06- 0.25 parts by volume. Amount of polypropylene powder is 0.34 to 0.50 parts by volume. EFFECT: improved magnetic characteristics, strength, and heat resistance of material. 3 cl, 2 tbl