(北京工業(yè)大學 材料科學與工程學院
新型功能材料教育部重點實驗室, 北京 100022)
摘 要: 采用放電等離子燒結技術制備高性能新型NdFeB永磁材料, 研究燒結工藝和熱處理工藝對磁體組織性能的影響。 采用掃描電子顯微鏡觀察磁體的微觀組織， 利用B-H回線儀檢測磁體的磁性能。 結果表明： 較高的燒結溫度有利于磁體的致密化， 但過高的溫度則阻礙液相在主相晶界的浸潤， 從而降低磁體的致密度。 在優(yōu)化工藝條件下制備出具有獨特的微觀組織且最佳性能為Br＝1.351 T， Hci＝674.4 kA/m， BHm＝360.4 kJ/m3的新型SPS NdFeB磁體。
關鍵字: 放電等離子燒結; NdFeB永磁材料; 富釹相; 熱處理
（ Key Laboratory of Advanced Functional Materials, Ministry of Education, College of Materials Science and Engineering, Beijing University of Technology, Beijing 100022）
Abstract: A new type of NdFeB magnet with high magnetic properties was prepared by spark plasma sintering(SPS) method. The effect of sintering and heat treatment techniques on microstructures and magnetic properties of magnets was systematically studied. The microstructures and magnetic properties of magnet materials were tested by scanning electronic microscope (SEM) and B-H loop-line instrument, respectively. The results show that the densification of magnets is greatly improved with the increase of sintering temperature, while exorbitant sintering temperature will decrease the density of magnets because the Nd-rich phase distributes poorly along the boundaries of the NdFeB grains. Under optimum processing conditions, the SPS NdFeB magnet possesses the best magnetic properties with remanence of 1.351 T, coercive force of 674.4 kA/m and maximum energy product of 360.4 kJ/m3.
Key words: spark plasma sintering; NdFeB permanent magnet; Nd-rich phase; heat treatment
