Microstructure and properties of Nd-Fe-B magnets prepared by spark plasma sintering

作者：Yue M^*; Zhang JX; Wang GP; Liu WQ; Zhou ML

来源：Materials Science and Technology, 2004, 20(5): 666-668.

DOI：10.1179/026708304225016608

• Nd-Fe-B magnets
• microstucture
• magnetic properties
• spark plasma sintering

Anisotropic Nd15.5Dy1.0FeBalCo3.0B6.8Al1.0 magnets were produced by the spark plasma sintering (SPS) technique. The effects of processing conditions on the microstructure, magnetic properties, dimensional precision and density of the magnets were studied. The magnetic properties, microstructure and constituents were investigated by means of a magnetic flux density-magnetic field strength (B-H) loopline instrument, scanning electron microscopy and energy dispersive X-ray analysis. The density of the magnets was determined by the Archimedes method, and the dimensional precision of the magnets was measured by micrometer. It was found that the microstructure of SPS processed Nd-Fe-B magnets is unique,; the grain size is fine and uniform while distribution of the neodymium rich phase is heterogeneous. The optimal magnetic properties of SPS processed Nd-Fe-B magnets obtained so far are maximum energy product of 240 kJ m(-3) and coercive force of 1260 kA m(-1). The dimensional precision of the magnets is similar to20 mum, and the density of the magnets reaches 7(.)58 g cm(-3).

• 出版日期2004-5
• 单位北京工业大学