Sm₂Fe₁₇N₃粉末の磁気特性に及ぼす粉砕方法の影響

抄録

In order to improve the magnetic properties of Sm₂Fe₁₇N₃ particles, several milling factors that influence the magnetic properties were systematically examined, including whether the mill is of the vibration or ball type, the milling time and the number of balls. It was found that the _iH_c decreases with aggregates and agglomerates of particles. Strain and oxidation led to a decrease in 4πI_s and 4πI_r. Addition of surfactant in the milling process inhibited aggregates and strain. The magnetic properties of Sm₂Fe₁₇N₃ particles are as follows: 4πI_r = 14.1 kG, _iH_c=9.2 kOe and (BH)_max = 34 MGOe. A typical epoxy-bonded magnet has a (BH)_max of 20 MGOe.