Abstract
Melt-spun ribbons of PrxFe91.5-x-y-zCo8TiyBzSi0.5 (x = 9.0-11.0, y = 0.5-2.0, z = 7.5-11.5) alloys were prepared by the single roller liquid rapid-quenching method, and the effects of composition, substrate surface velocity and annealing condition on the magnetic properties were studied. The optimum preparation conditions and some of the properties were as follows: composition: Pr10Fe69.5Co8Ti1.5B10.5Si0.5; substrate surface velocity: 10.0 m/s; annealing condition 650°C for 0 min in Ar atmosphere; magnetic properties: (BH)max = 119.9 kJ/m3, HcJ = 1004.0 kA/m, HcB = 559.3 kA/m, Jr = 0.87 T, recoil ratio = 29.0 %, Hk/HcJ×100 = 33.0 %, α(Jr)ave = −0.047 %/°C, α (HcJ) = −0.43 %/°C and Tc = 393 °C. From TEM observation, the average particle size of this ribbon was found to be about 16 nm. Compression-molded isotropic bonded magnets were prepared by using Pr10Fe69.5Co8Ti1.5B10.5Si0.5 ribbons annealed at 650 °C for 0 min. Their magnetic properties were (BH)max = 80.2 kJ/m3, HcJ = 953.1 kA/m, HcB = 461.9 kA/m, Jr = 0.69 T, Hk/HcJ×100 = 32.8 %, irreversible loss = −2.12 % (at 125 °C), density = 6.29 Mg/m3.
