The effect of high energy milling on Nd₂Fe₁₄B ribbons of melt-spun product

The Effect of high energy milling on Nd₂Fe₁₄B ribbons of melt-spun products. Preliminary research on the effect of milling time with high energy milling (HEM) on the Nd₂Fe₁₄B ribbons of melt-spun products as a base material for the manufacture of hot-press permanent magnets using the SPS (Spark Plasma Sintering) technique have been carried out. The milling period appears to affect magnetic parameters such as the saturation field, Ms and the coercive field, Hc. The Ms value for Nd₂Fe₁₄B-ribbon material is 101 emu/g, while Ms values for Nd₂Fe₁₄B-after milling were 122, 106 and 107 emu/gram for 1.5, 3.0, and 5.0 hours milling time, respectively. The coercive field value of Hc on the Nd₂Fe₁₄B-ribbon was 0.045 Tesla, while the Hc on Nd₂Fe₁₄B-after milling 1.5, 3.0, and 5.0 hours were 0.122, 0.173, and 0.132 Tesla, respectively. The change and improvement in Ms and Hc values have a strong correlation with the fraction of the phases formed during the milling process. As a result of the milling process, the melt-spun product of Nd₂Fe₁₄B, which initially consists of 96% Nd₂Fe₁₄B and 4% Nd₂O₃ phase, changes to predominantly Fe phase, the rest is Nd₂Fe₁₄B, and Nd₂O₃ in very small amounts. The high energy milling of the melt-spun product of Nd₂Fe₁₄B in toluene media has caused the Nd₂Fe₁₄B phase decrease by more than 90%. To keep Fe from being separated from the Nd₂Fe₁₄B compound, a surfactant is most likely needed during the milling process.