ANISOTROPIC PR-FE-B MELT SPUN RIBBONS

Magnetic properties and microstructures of Pr-Fe-B-(Ga) melt-spun ribbons prepared by single or twin-roller have been studied. The strong intensities of (004) and (006) X-ray diffraction peaks are observed in roller and free surfaces of Pr17Fe75B8ribbons quenched by single-roller at Vs = 3 m/s, and in both surfaces of Pr15Fe75B8Ga1ribbon quenched by twin-roller at Vs = m/s. It shows that c-axis of Pr2Fe14B grain lies normal to the surface of melt-spun ribbons. Magnetic measurements of ground powders of melt-spun ribbons reveal that the ground powders produced by twin-roller have higher coercivity and remanence than those prepared by single-roller. The powders aligned in a magnetic field of 12 koe show a high coercivity of iHc = 12.8 koe and higher remanence of Br = 5.6 kG than in the powders solidified in non-magnetic field (Br = 4.1 kG). © 1990 IEEE