Title :
Anisotropic Pr-Fe-B melt-spun ribbons
Author :
Paik, C.R. ; Okada, M. ; Homma, M.
Author_Institution :
Dept. of Mater. Sci., Tohoku Univ., Sendai, Japan
fDate :
9/1/1990 12:00:00 AM
Abstract :
Magnetic properties and microstructures of Pr-Fe-B-(Ga) melt-spun ribbons prepared by single or twin rollers have been studied. Strong intensities of (004) and (006) X-ray diffraction peaks were observed in roller and free surfaces of Pr17Fe75B8 ribbons quenched by a single roller at Vs=8 m/s, and in both surfaces of Pr15Fe76B8Ga1 ribbon quenched by twin roller at Vs=1 m/s. It is shown that the 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 the twin roller have higher coercivity and remanence than those prepared by the single roller. The powders aligned in a magnetic field of 12 kOe show a high coercivity of iHc=12.8 kOe and a higher remanence of B r=5.6 kG than in powders solidified in a nonmagnetic field ( Br=4.1 kG)
Keywords :
X-ray diffraction examination of materials; boron alloys; coercive force; crystal microstructure; ferromagnetic properties of substances; iron alloys; magnetic anisotropy; magnetic properties of fine particles; melt spinning; powder metallurgy; praseodymium alloys; quenching (thermal); remanence; (004); (006) X-ray diffraction peaks; Pr15Fe76B8Ga1; Pr17Fe75B8 ribbons; Pr2Fe14B; anisotropic ribbons; c-axis; coercivity; free surfaces; ground powders; melt-spun ribbons; microstructures; nonmagnetic field; quenching; remanence; single roller; twin rollers; Anisotropic magnetoresistance; Coercive force; Iron; Magnetic field measurement; Magnetic properties; Magnetic variables measurement; Microstructure; Powders; Remanence; X-ray diffraction;
Journal_Title :
Magnetics, IEEE Transactions on
