Heat treatment process of new NdFeB magnet prepared by spark plasma sintering
(1. School of Materials Science and Engineering,
University of Science and Technology Beijing, Beijing 100083, China;
2. Beijing University of Technology, Advanced Functional Materials Key laboratory, Ministry of Education, Beijing 100022, China)
University of Science and Technology Beijing, Beijing 100083, China;
2. Beijing University of Technology, Advanced Functional Materials Key laboratory, Ministry of Education, Beijing 100022, China)
Abstract: In recent years, spark plasma sintering technique(SPS) has been a focus in the field of material preparation due to its advantages. SPS technique is first introduced for preparation of high quality NdFeB magnets. The effects of heat treatment process on the magnetic properties of SPS NdFeB magnet were investigated. Meanwhile, the effects of heat treatment process on the microstructure, tropism and dimensional precision of the SPS NdFeB magnets were also studied. The high quality NdFeB magnets with fine grains were prepared under proper heat treatment process. The results show that the magnetic properties of SPS NdFeB can be further improved through proper heat treatment process. Meanwhile, the experiment also demonstrates that it is feasible to prepare near-net-shape NdFeB magnets with fine grains and high magnetic property by spark plasma sintering.
Key words: spark plasma sintering; formability; shrinkage ratio; heat treatment