注射工艺对高磁粉装载量PPS/NdFeB粘结磁体磁性能的影响

摘要

Currently, the preparation of high loading PPS/NdFeB injection magnet is the focus of research. In this article,PPS/NdFeB bonded magnet and permanent device in practical use with magnetic powder loading being a-bout 90wt% were prepared successfully,tested by DSC,SEM and magnetizing curve tester in order to be characterized with microstructure and magnetic performances, and analyzed on processes parameters to the laws and reasons. The results showed that while injection temperature, velocity and pressure is respectively 305℃, 90% Umax and 153MPa,bonded magnet(·10mm× 10mm) can obtain 5. 12 g/cm3 of density,and the magnetic performances (BH)max,Br,Hci) can reach to 47. lkJ/m3,0. 53T,647. 3kA/m respectively. After being magnetized for 24 poles,surface magnetic field intensity of bonded permanent device (diameter 020mm and inner 018mm) can a-chieve 145. 06mT.%高磁粉装载量PPS/NdFeB注射磁体的制备是目前国内外研究的重点.成功制备出磁粉装载量90％(质量分数)左右的PPS/NdFeB粘结磁体以及可实际应用永磁元器件,应用DSC、SEM和磁化曲线测量仪等表征了注射磁体微观结构和磁性能,并分析注射温度、速度和压力等工艺参数对粘结磁体微观结构和磁性能的影响规律和机理,结果表明,当注射温度为305℃、注射速率为90％Vmax、注射压力为153MPa时,粘结磁体((φ)10mm×10mm)密度可达5.12g/cm3,磁性能可达(BH)max=47.1kJ/m3,Br=0.53T,Hci=647.3kA/m,粘结永磁元器件(外径(φ)20mm,内径(φ)18mm)24极充磁后,表面磁场强度达到145.06mT.