NANOCOMPOSITE MAGNETS OF IRON BASE ALLOY INCORPORATING RARE-EARTH ELEMENT Russian patent published in 2005 - IPC

FIELD: manufacture of magnets including nanocomposite ones from alloy incorporating rare-earth element.

SUBSTANCE: proposed nanocomposite magnet is produced from iron base alloy incorporating rare-earth element, its composition being (Fe_{1 - m}T_m)_100-x-y-zO_xR_yTi_z, where T -C0 and/or Ni; Q - B and/or C, R is at least one rare-earth element. Here 10 atom percent < x ≤ 17 atom percent; 7 atom percent ≤ y < 10 atom percent; 0.5 atom percent ≤ z ≤ z ≤ 6 atom percent; 0 ≤ m ≤0.5. Magnet has crystal grains of R₂T₁₄Q combination, mean grain size being 20 - 200 nm, and iron base ferromagnetic boride present at R₂T₁₄Q boundary. Iron base ferromagnetic boride is dispersed at grain boundary or is present in the form of film at grain boundary and partially covers surface of crystal grains of R₂T₁₄Q combination.

EFFECT: enhanced coercivity.

18 cl, 8 dwg, 3 tbl, 2 ex