流动温压成型黏结钕铁硼/锶铁氧体复合磁体的研究

摘要

Bonded NdFeB/Sr-ferrite hybrid magnets were synthesized by using warm flow compaction (WFC)technique,and the influences of WFC parameters on the magnetic properties were investiga-ted.The results show that the magnetic properties firstly increase and then decrease with the increase of temperature,pressure and time.The selection of parameters for WFC process is associated with the selected binder.When the epoxy phenolic resin BPANE8200 is used as binder,the optimum process parameters of WFC are 77℃,with loading of 900MPa,and holding time for 8min.The values of rema-nence Br ,intrinsic coercive force Hcj and maximum energy product (BH)max of the hybrid magnets are all obtained the maximum,that is,Br= 522mT,Hcj= 740.48kA/m,(BH)max= 39.82kJ/m3 .%采用流动温压成型工艺制备黏结钕铁硼/锶铁氧体复合磁体,研究温压工艺参数对钕铁硼/锶铁氧体复合磁体磁性能的影响.结果表明:随着温压温度、压制时间以及保压压力的提高,黏结复合磁体的磁性能呈现先增大后减小的趋势.流动温压成型参数的选择与黏结剂有关,采用酚醛环氧树脂BPANE8200为黏结剂时,流动温压成型的最佳工艺参数:77℃加载900MPa并保压8min,复合磁体的剩磁Br、内禀矫顽力Hcj以及最大磁能积(BH)max均获得最大值,即Br=522mT,Hcj=740.48kA/m,(BH)max=39.82kJ/m3.