Effect of heat treatment on magnetic properties of nanocomposite Nd-lean Nd_7Fe_(73)B_(20) ribbons

摘要

In this work, we explored the effect of heat treatment on high boron and Nd-lean content magnetic Nd_7Fe_(73)B_(20) nanocomposite materials via vibration sample magnetometer (VSM), X-ray diffraction, differential thermal analysis (DTA), and scanning electron microscope (SEM). The Scherer formula was employed to estimate the effect in the crystal size of the heat treatment on high boron and Nd-lean content magnetic Nd_7Fe_(73)B_(20) nanocomposite materials. We heat-treated samples in different conditions to obtain optimum magnetic properties. Our high-throughput fabrication strategy allows us to elucidate the possibility of obtaining Nd-lean nanocomposite NdFeB magnet in terms of the melt-spinning. We evaluated the influence of heat treatment on the Nd-lean NdFeB /a-Fe nanocomposite magnets produced by melt-spinning. Here, in the heat-treated ribbon at 750 °C for 30 min, we obtained a combination of coerdvity of 450 Oe, a high-saturation magnetization of 232 emu/g in the heat-treated ribbon at 650 °C for 30 min, which surpasses most traditional nanocrystalline magnets based on Fe-Co and pricey. The results we present here are expected to serve as a guideline for designing new magnets for industrial applications.