Enhancing Magnetic Properties of Bulk Anisotropic Nd–Fe–B/$alpha$-Fe Composite Magnets by Applying Powder Coating Technologies

Enhanced Magnetic Properties and Thermal Stability of Nd₂Fe₁₄B/SmCo₅ Composite Permanent Magnets Prepared by Spark Plasma Sintering

“…On the other hand, the demand for good thermal stability in permanent magnet is required in many fields especially for aerospace industry. In general, two methods are raised to meet the demand by combin ing two different materials with high magnetization and h igh coercivity o r two materials with good room-temperature performance and high thermal stability [1][2][3][4][5][6][7][8][9][10]. Unfortunately, the imp rovement of thermal stability is always accompanied by some loss of the room-temperature properties, and the reasons for this underachievement are easily understood.…”

Magnetic Properties Hard-Soft SmCo<sub>5</sub>-FeNi and SmCo<sub>5</sub>-FeCo Composites Prepared by Electroless Coating Technique

“…Thus, if the soft phase size could be re-duced and highly dispersed throughout the magnet, then the interaction between hard-soft phases could be significantly enhanced, leading to significant improvement in (BH) max energy product. Various techniques such as sputtering, pulse laser deposition (PLD), electrolytic coating, and electroless coating [13] have been explored to increase the interaction between hard-soft phases of the composite.…”

The influence of the powder densification temperature on the microstructure and magnetic properties of anisotropic NdFeB magnets aligned by hot deformation

“…Anisotropic NeFeB magnets having very good magnetic properties ((BH) max = 440 kA/m), can be produced from pulverized melt spun ribbon by a two-stage process: hot densification of the powder, followed by hot deformation, for instance by die-upset forging or back extrusion [1]. The first stage of this process produces an isotropic compact, known as an MQ2 magnet [2,3], with a density close to theoretical.…”

“…700 • C [6], 725 • C [7], 730 • C [4], 750 • C [8], Alternatively, they are given as ranges, e.g. 600-700 • C [1,9,10], 725 ± 25 • C [11], 650-750 • C [12], 700-750 • C [2], 650-800 • C [13]. In none of the publications is the relationship between the temperature for the powder densification and the magnetic properties of the anisotropic magnets given to justify the use of a given temperature or temperature range.…”