Study on a new kind of NdFeB magnet prepared by spark plasma sintering

作者：Yue M^*; Wang GP; Zhang JX; Zhou ML; Zuo TY

来源：Rare Metal Materials and Engineering, 2003, 32(10): 844-847.

• spark plasma sintering
• magnetic properties
• NdFeB
• permanent magnet

A new kind of NdFeB magnet was produced by spark plasma sintering technique. Magnetic properties, microstructure and constituents were investigated by means of B-H loop-line instrument, scanning electron microscope and energy dispersive X-ray detector. The effects of processing conditions on the magnetic properties, dimensional precision as well as density were studied. The electrochemical property in electrolytes and the corrosion behavior in oxidation environment were examined for the magnets. It is found that the microstructure of SPS NdFeB magnet is different from that of conventional one, the grain size is fine and uniform while the distribution of the Nd-rich phase is heterogeneous. The optimal magnetic properties of the SPS NdFeB magnets obtained so far are of a maximum energy product of 240 kJ/m(3) and a coercive force of 1260 kA/m. The density of the magnet reaches 7.58 g/cm(3) as well as the dimensional precision of the magnets is about 20 mum. Meanwhile, the electrochemical property and the corrosion resistance of SPS NdFeB magnets are much better if compared with conventional one.

• 出版日期2003-10
• 单位北京工业大学