Investigation of easy axis orientation of Nd–Fe–B melt-spun ribbons produced by hot rolling and influence of Ti–C addition
2012
The c-axis orientation of Nd–Fe–B melt-spun ribbons caused by hot rolling and the influence of Ti–C addition were investigated. A small roll was placed on a steel wheel near a quartz tube in such a manner that the melt-spun ribbons were hot rolled immediately after quenching. X-ray diffraction patterns measured on both surfaces of the Nd–Fe–B–Ti ribbon indicate that the c-axis is oriented normal to the ribbon plane. The domain pattern of the Nd–Fe–B–Ti–C ribbon was observed with a Kerr microscope. Most of the grains exhibit a maze domain configuration, indicating that the c-axis is oriented normal to the ribbon plane. Furthermore, it was demonstrated that hot rolling and the addition of Ti–C promote c-axis orientation and high coercivity of Nd–Fe–B melt-spun ribbons.
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